networking/httpd.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * httpd implementation for busybox
   4  *
   5  * Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org>
   6  * Copyright (C) 2003-2006 Vladimir Oleynik <dzo@simtreas.ru>
   7  *
   8  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   9  *
  10  *****************************************************************************
  11  *
  12  * Typical usage:
  13  * For non root user:
  14  *      httpd -p 8080 -h $HOME/public_html
  15  * For daemon start from rc script with uid=0:
  16  *      httpd -u www
  17  * which is equivalent to (assuming user www has uid 80):
  18  *      httpd -p 80 -u 80 -h $PWD -c /etc/httpd.conf -r "Web Server Authentication"
  19  *
  20  * When an url starts with "/cgi-bin/" it is assumed to be a cgi script.
  21  * The server changes directory to the location of the script and executes it
  22  * after setting QUERY_STRING and other environment variables.
  23  *
  24  * Doc:
  25  * "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html
  26  *
  27  * The applet can also be invoked as an url arg decoder and html text encoder
  28  * as follows:
  29  *      foo=`httpd -d $foo`             # decode "Hello%20World" as "Hello World"
  30  *      bar=`httpd -e "<Hello World>"`  # encode as "&#60Hello&#32World&#62"
  31  * Note that url encoding for arguments is not the same as html encoding for
  32  * presentation.  -d decodes an url-encoded argument while -e encodes in html
  33  * for page display.
  34  *
  35  * httpd.conf has the following format:
  36  *
  37  * H:/serverroot     # define the server root. It will override -h
  38  * A:172.20.         # Allow address from 172.20.0.0/16
  39  * A:10.0.0.0/25     # Allow any address from 10.0.0.0-10.0.0.127
  40  * A:10.0.0.0/255.255.255.128  # Allow any address that previous set
  41  * A:127.0.0.1       # Allow local loopback connections
  42  * D:*               # Deny from other IP connections
  43  * E404:/path/e404.html # /path/e404.html is the 404 (not found) error page
  44  * I:index.html      # Show index.html when a directory is requested
  45  *
  46  * P:/url:[http://]hostname[:port]/new/path
  47  *                   # When /urlXXXXXX is requested, reverse proxy
  48  *                   # it to http://hostname[:port]/new/pathXXXXXX
  49  *
  50  * /cgi-bin:foo:bar  # Require user foo, pwd bar on urls starting with /cgi-bin/
  51  * /adm:admin:setup  # Require user admin, pwd setup on urls starting with /adm/
  52  * /adm:toor:PaSsWd  # or user toor, pwd PaSsWd on urls starting with /adm/
  53  * .au:audio/basic   # additional mime type for audio.au files
  54  * *.php:/path/php   # run xxx.php through an interpreter
  55  *
  56  * A/D may be as a/d or allow/deny - only first char matters.
  57  * Deny/Allow IP logic:
  58  *  - Default is to allow all (Allow all (A:*) is a no-op).
  59  *  - Deny rules take precedence over allow rules.
  60  *  - "Deny all" rule (D:*) is applied last.
  61  *
  62  * Example:
  63  *   1. Allow only specified addresses
  64  *     A:172.20          # Allow any address that begins with 172.20.
  65  *     A:10.10.          # Allow any address that begins with 10.10.
  66  *     A:127.0.0.1       # Allow local loopback connections
  67  *     D:*               # Deny from other IP connections
  68  *
  69  *   2. Only deny specified addresses
  70  *     D:1.2.3.        # deny from 1.2.3.0 - 1.2.3.255
  71  *     D:2.3.4.        # deny from 2.3.4.0 - 2.3.4.255
  72  *     A:*             # (optional line added for clarity)
  73  *
  74  * If a sub directory contains a config file it is parsed and merged with
  75  * any existing settings as if it was appended to the original configuration.
  76  *
  77  * subdir paths are relative to the containing subdir and thus cannot
  78  * affect the parent rules.
  79  *
  80  * Note that since the sub dir is parsed in the forked thread servicing the
  81  * subdir http request, any merge is discarded when the process exits.  As a
  82  * result, the subdir settings only have a lifetime of a single request.
  83  *
  84  * Custom error pages can contain an absolute path or be relative to
  85  * 'home_httpd'. Error pages are to be static files (no CGI or script). Error
  86  * page can only be defined in the root configuration file and are not taken
  87  * into account in local (directories) config files.
  88  *
  89  * If -c is not set, an attempt will be made to open the default
  90  * root configuration file.  If -c is set and the file is not found, the
  91  * server exits with an error.
  92  *
  93  */
  94  /* TODO: use TCP_CORK, parse_config() */
  95
  96 #include "libbb.h"
  97 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
  98 # include <sys/sendfile.h>
  99 #endif
 100 /* amount of buffering in a pipe */
 101 #ifndef PIPE_BUF
 102 # define PIPE_BUF 4096
 103 #endif
 104
 105 #define DEBUG 0
 106
 107 #define IOBUF_SIZE 8192
 108 #if PIPE_BUF >= IOBUF_SIZE
 109 # error "PIPE_BUF >= IOBUF_SIZE"
 110 #endif
 111
 112 #define HEADER_READ_TIMEOUT 60
 113
 114 static const char DEFAULT_PATH_HTTPD_CONF[] ALIGN1 = "/etc";
 115 static const char HTTPD_CONF[] ALIGN1 = "httpd.conf";
 116 static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
 117 static const char index_html[] ALIGN1 = "index.html";
 118
 119 typedef struct has_next_ptr {
 120         struct has_next_ptr *next;
 121 } has_next_ptr;
 122
 123 /* Must have "next" as a first member */
 124 typedef struct Htaccess {
 125         struct Htaccess *next;
 126         char *after_colon;
 127         char before_colon[1];  /* really bigger, must be last */
 128 } Htaccess;
 129
 130 /* Must have "next" as a first member */
 131 typedef struct Htaccess_IP {
 132         struct Htaccess_IP *next;
 133         unsigned ip;
 134         unsigned mask;
 135         int allow_deny;
 136 } Htaccess_IP;
 137
 138 /* Must have "next" as a first member */
 139 typedef struct Htaccess_Proxy {
 140         struct Htaccess_Proxy *next;
 141         char *url_from;
 142         char *host_port;
 143         char *url_to;
 144 } Htaccess_Proxy;
 145
 146 enum {
 147         HTTP_OK = 200,
 148         HTTP_PARTIAL_CONTENT = 206,
 149         HTTP_MOVED_TEMPORARILY = 302,
 150         HTTP_BAD_REQUEST = 400,       /* malformed syntax */
 151         HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
 152         HTTP_NOT_FOUND = 404,
 153         HTTP_FORBIDDEN = 403,
 154         HTTP_REQUEST_TIMEOUT = 408,
 155         HTTP_NOT_IMPLEMENTED = 501,   /* used for unrecognized requests */
 156         HTTP_INTERNAL_SERVER_ERROR = 500,
 157         HTTP_CONTINUE = 100,
 158 #if 0   /* future use */
 159         HTTP_SWITCHING_PROTOCOLS = 101,
 160         HTTP_CREATED = 201,
 161         HTTP_ACCEPTED = 202,
 162         HTTP_NON_AUTHORITATIVE_INFO = 203,
 163         HTTP_NO_CONTENT = 204,
 164         HTTP_MULTIPLE_CHOICES = 300,
 165         HTTP_MOVED_PERMANENTLY = 301,
 166         HTTP_NOT_MODIFIED = 304,
 167         HTTP_PAYMENT_REQUIRED = 402,
 168         HTTP_BAD_GATEWAY = 502,
 169         HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
 170 #endif
 171 };
 172
 173 static const uint16_t http_response_type[] ALIGN2 = {
 174         HTTP_OK,
 175 #if ENABLE_FEATURE_HTTPD_RANGES
 176         HTTP_PARTIAL_CONTENT,
 177 #endif
 178         HTTP_MOVED_TEMPORARILY,
 179         HTTP_REQUEST_TIMEOUT,
 180         HTTP_NOT_IMPLEMENTED,
 181 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 182         HTTP_UNAUTHORIZED,
 183 #endif
 184         HTTP_NOT_FOUND,
 185         HTTP_BAD_REQUEST,
 186         HTTP_FORBIDDEN,
 187         HTTP_INTERNAL_SERVER_ERROR,
 188 #if 0   /* not implemented */
 189         HTTP_CREATED,
 190         HTTP_ACCEPTED,
 191         HTTP_NO_CONTENT,
 192         HTTP_MULTIPLE_CHOICES,
 193         HTTP_MOVED_PERMANENTLY,
 194         HTTP_NOT_MODIFIED,
 195         HTTP_BAD_GATEWAY,
 196         HTTP_SERVICE_UNAVAILABLE,
 197 #endif
 198 };
 199
 200 static const struct {
 201         const char *name;
 202         const char *info;
 203 } http_response[ARRAY_SIZE(http_response_type)] = {
 204         { "OK", NULL },
 205 #if ENABLE_FEATURE_HTTPD_RANGES
 206         { "Partial Content", NULL },
 207 #endif
 208         { "Found", NULL },
 209         { "Request Timeout", "No request appeared within 60 seconds" },
 210         { "Not Implemented", "The requested method is not recognized" },
 211 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 212         { "Unauthorized", "" },
 213 #endif
 214         { "Not Found", "The requested URL was not found" },
 215         { "Bad Request", "Unsupported method" },
 216         { "Forbidden", ""  },
 217         { "Internal Server Error", "Internal Server Error" },
 218 #if 0   /* not implemented */
 219         { "Created" },
 220         { "Accepted" },
 221         { "No Content" },
 222         { "Multiple Choices" },
 223         { "Moved Permanently" },
 224         { "Not Modified" },
 225         { "Bad Gateway", "" },
 226         { "Service Unavailable", "" },
 227 #endif
 228 };
 229
 230 struct globals {
 231         int verbose;            /* must be int (used by getopt32) */
 232         smallint flg_deny_all;
 233
 234         unsigned rmt_ip;        /* used for IP-based allow/deny rules */
 235         time_t last_mod;
 236         char *rmt_ip_str;       /* for $REMOTE_ADDR and $REMOTE_PORT */
 237         const char *bind_addr_or_port;
 238
 239         const char *g_query;
 240         const char *opt_c_configFile;
 241         const char *home_httpd;
 242         const char *index_page;
 243
 244         const char *found_mime_type;
 245         const char *found_moved_temporarily;
 246         Htaccess_IP *ip_a_d;    /* config allow/deny lines */
 247
 248         IF_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
 249         IF_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
 250         IF_FEATURE_HTTPD_CGI(char *referer;)
 251         IF_FEATURE_HTTPD_CGI(char *user_agent;)
 252         IF_FEATURE_HTTPD_CGI(char *host;)
 253         IF_FEATURE_HTTPD_CGI(char *http_accept;)
 254         IF_FEATURE_HTTPD_CGI(char *http_accept_language;)
 255
 256         off_t file_size;        /* -1 - unknown */
 257 #if ENABLE_FEATURE_HTTPD_RANGES
 258         off_t range_start;
 259         off_t range_end;
 260         off_t range_len;
 261 #endif
 262
 263 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 264         Htaccess *g_auth;       /* config user:password lines */
 265 #endif
 266         Htaccess *mime_a;       /* config mime types */
 267 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 268         Htaccess *script_i;     /* config script interpreters */
 269 #endif
 270         char *iobuf;            /* [IOBUF_SIZE] */
 271 #define hdr_buf bb_common_bufsiz1
 272         char *hdr_ptr;
 273         int hdr_cnt;
 274 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 275         const char *http_error_page[ARRAY_SIZE(http_response_type)];
 276 #endif
 277 #if ENABLE_FEATURE_HTTPD_PROXY
 278         Htaccess_Proxy *proxy;
 279 #endif
 280 #if ENABLE_FEATURE_HTTPD_GZIP
 281         /* client can handle gzip / we are going to send gzip */
 282         smallint content_gzip;
 283 #endif
 284 };
 285 #define G (*ptr_to_globals)
 286 #define verbose           (G.verbose          )
 287 #define flg_deny_all      (G.flg_deny_all     )
 288 #define rmt_ip            (G.rmt_ip           )
 289 #define bind_addr_or_port (G.bind_addr_or_port)
 290 #define g_query           (G.g_query          )
 291 #define opt_c_configFile  (G.opt_c_configFile )
 292 #define home_httpd        (G.home_httpd       )
 293 #define index_page        (G.index_page       )
 294 #define found_mime_type   (G.found_mime_type  )
 295 #define found_moved_temporarily (G.found_moved_temporarily)
 296 #define last_mod          (G.last_mod         )
 297 #define ip_a_d            (G.ip_a_d           )
 298 #define g_realm           (G.g_realm          )
 299 #define remoteuser        (G.remoteuser       )
 300 #define referer           (G.referer          )
 301 #define user_agent        (G.user_agent       )
 302 #define host              (G.host             )
 303 #define http_accept       (G.http_accept      )
 304 #define http_accept_language (G.http_accept_language)
 305 #define file_size         (G.file_size        )
 306 #if ENABLE_FEATURE_HTTPD_RANGES
 307 #define range_start       (G.range_start      )
 308 #define range_end         (G.range_end        )
 309 #define range_len         (G.range_len        )
 310 #else
 311 enum {
 312         range_start = 0,
 313         range_end = MAXINT(off_t) - 1,
 314         range_len = MAXINT(off_t),
 315 };
 316 #endif
 317 #define rmt_ip_str        (G.rmt_ip_str       )
 318 #define g_auth            (G.g_auth           )
 319 #define mime_a            (G.mime_a           )
 320 #define script_i          (G.script_i         )
 321 #define iobuf             (G.iobuf            )
 322 #define hdr_ptr           (G.hdr_ptr          )
 323 #define hdr_cnt           (G.hdr_cnt          )
 324 #define http_error_page   (G.http_error_page  )
 325 #define proxy             (G.proxy            )
 326 #if ENABLE_FEATURE_HTTPD_GZIP
 327 # define content_gzip     (G.content_gzip     )
 328 #else
 329 # define content_gzip     0
 330 #endif
 331 #define INIT_G() do { \
 332         SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 333         IF_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
 334         bind_addr_or_port = "80"; \
 335         index_page = index_html; \
 336         file_size = -1; \
 337 } while (0)
 338
 339
 340 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
 341
 342 /* Prototypes */
 343 enum {
 344         SEND_HEADERS     = (1 << 0),
 345         SEND_BODY        = (1 << 1),
 346         SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY,
 347 };
 348 static void send_file_and_exit(const char *url, int what) NORETURN;
 349
 350 static void free_llist(has_next_ptr **pptr)
 351 {
 352         has_next_ptr *cur = *pptr;
 353         while (cur) {
 354                 has_next_ptr *t = cur;
 355                 cur = cur->next;
 356                 free(t);
 357         }
 358         *pptr = NULL;
 359 }
 360
 361 static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
 362 {
 363         free_llist((has_next_ptr**)pptr);
 364 }
 365
 366 static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
 367 {
 368         free_llist((has_next_ptr**)pptr);
 369 }
 370
 371 /* Returns presumed mask width in bits or < 0 on error.
 372  * Updates strp, stores IP at provided pointer */
 373 static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
 374 {
 375         const char *p = *strp;
 376         int auto_mask = 8;
 377         unsigned ip = 0;
 378         int j;
 379
 380         if (*p == '/')
 381                 return -auto_mask;
 382
 383         for (j = 0; j < 4; j++) {
 384                 unsigned octet;
 385
 386                 if ((*p < '0' || *p > '9') && *p != '/' && *p)
 387                         return -auto_mask;
 388                 octet = 0;
 389                 while (*p >= '0' && *p <= '9') {
 390                         octet *= 10;
 391                         octet += *p - '0';
 392                         if (octet > 255)
 393                                 return -auto_mask;
 394                         p++;
 395                 }
 396                 if (*p == '.')
 397                         p++;
 398                 if (*p != '/' && *p)
 399                         auto_mask += 8;
 400                 ip = (ip << 8) | octet;
 401         }
 402         if (*p) {
 403                 if (*p != endc)
 404                         return -auto_mask;
 405                 p++;
 406                 if (*p == '\0')
 407                         return -auto_mask;
 408         }
 409         *ipp = ip;
 410         *strp = p;
 411         return auto_mask;
 412 }
 413
 414 /* Returns 0 on success. Stores IP and mask at provided pointers */
 415 static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
 416 {
 417         int i;
 418         unsigned mask;
 419         char *p;
 420
 421         i = scan_ip(&str, ipp, '/');
 422         if (i < 0)
 423                 return i;
 424
 425         if (*str) {
 426                 /* there is /xxx after dotted-IP address */
 427                 i = bb_strtou(str, &p, 10);
 428                 if (*p == '.') {
 429                         /* 'xxx' itself is dotted-IP mask, parse it */
 430                         /* (return 0 (success) only if it has N.N.N.N form) */
 431                         return scan_ip(&str, maskp, '\0') - 32;
 432                 }
 433                 if (*p)
 434                         return -1;
 435         }
 436
 437         if (i > 32)
 438                 return -1;
 439
 440         if (sizeof(unsigned) == 4 && i == 32) {
 441                 /* mask >>= 32 below may not work */
 442                 mask = 0;
 443         } else {
 444                 mask = 0xffffffff;
 445                 mask >>= i;
 446         }
 447         /* i == 0 -> *maskp = 0x00000000
 448          * i == 1 -> *maskp = 0x80000000
 449          * i == 4 -> *maskp = 0xf0000000
 450          * i == 31 -> *maskp = 0xfffffffe
 451          * i == 32 -> *maskp = 0xffffffff */
 452         *maskp = (uint32_t)(~mask);
 453         return 0;
 454 }
 455
 456 /*
 457  * Parse configuration file into in-memory linked list.
 458  *
 459  * Any previous IP rules are discarded.
 460  * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
 461  * are also discarded.  That is, previous settings are retained if flag is
 462  * SUBDIR_PARSE.
 463  * Error pages are only parsed on the main config file.
 464  *
 465  * path   Path where to look for httpd.conf (without filename).
 466  * flag   Type of the parse request.
 467  */
 468 /* flag param: */
 469 enum {
 470         FIRST_PARSE    = 0, /* path will be "/etc" */
 471         SIGNALED_PARSE = 1, /* path will be "/etc" */
 472         SUBDIR_PARSE   = 2, /* path will be derived from URL */
 473 };
 474 static void parse_conf(const char *path, int flag)
 475 {
 476         /* internally used extra flag state */
 477         enum { TRY_CURDIR_PARSE = 3 };
 478
 479         FILE *f;
 480         const char *filename;
 481         char buf[160];
 482
 483         /* discard old rules */
 484         free_Htaccess_IP_list(&ip_a_d);
 485         flg_deny_all = 0;
 486         /* retain previous auth and mime config only for subdir parse */
 487         if (flag != SUBDIR_PARSE) {
 488                 free_Htaccess_list(&mime_a);
 489 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 490                 free_Htaccess_list(&g_auth);
 491 #endif
 492 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 493                 free_Htaccess_list(&script_i);
 494 #endif
 495         }
 496
 497         filename = opt_c_configFile;
 498         if (flag == SUBDIR_PARSE || filename == NULL) {
 499                 filename = alloca(strlen(path) + sizeof(HTTPD_CONF) + 2);
 500                 sprintf((char *)filename, "%s/%s", path, HTTPD_CONF);
 501         }
 502
 503         while ((f = fopen_for_read(filename)) == NULL) {
 504                 if (flag >= SUBDIR_PARSE) { /* SUBDIR or TRY_CURDIR */
 505                         /* config file not found, no changes to config */
 506                         return;
 507                 }
 508                 if (flag == FIRST_PARSE) {
 509                         /* -c CONFFILE given, but CONFFILE doesn't exist? */
 510                         if (opt_c_configFile)
 511                                 bb_simple_perror_msg_and_die(opt_c_configFile);
 512                         /* else: no -c, thus we looked at /etc/httpd.conf,
 513                          * and it's not there. try ./httpd.conf: */
 514                 }
 515                 flag = TRY_CURDIR_PARSE;
 516                 filename = HTTPD_CONF;
 517         }
 518
 519 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 520         /* in "/file:user:pass" lines, we prepend path in subdirs */
 521         if (flag != SUBDIR_PARSE)
 522                 path = "";
 523 #endif
 524         /* The lines can be:
 525          *
 526          * I:default_index_file
 527          * H:http_home
 528          * [AD]:IP[/mask]   # allow/deny, * for wildcard
 529          * Ennn:error.html  # error page for status nnn
 530          * P:/url:[http://]hostname[:port]/new/path # reverse proxy
 531          * .ext:mime/type   # mime type
 532          * *.php:/path/php  # run xxx.php through an interpreter
 533          * /file:user:pass  # username and password
 534          */
 535         while (fgets(buf, sizeof(buf), f) != NULL) {
 536                 unsigned strlen_buf;
 537                 unsigned char ch;
 538                 char *after_colon;
 539
 540                 { /* remove all whitespace, and # comments */
 541                         char *p, *p0;
 542
 543                         p0 = buf;
 544                         /* skip non-whitespace beginning. Often the whole line
 545                          * is non-whitespace. We want this case to work fast,
 546                          * without needless copying, therefore we don't merge
 547                          * this operation into next while loop. */
 548                         while ((ch = *p0) != '\0' && ch != '\n' && ch != '#'
 549                          && ch != ' ' && ch != '\t'
 550                         ) {
 551                                 p0++;
 552                         }
 553                         p = p0;
 554                         /* if we enter this loop, we have some whitespace.
 555                          * discard it */
 556                         while (ch != '\0' && ch != '\n' && ch != '#') {
 557                                 if (ch != ' ' && ch != '\t') {
 558                                         *p++ = ch;
 559                                 }
 560                                 ch = *++p0;
 561                         }
 562                         *p = '\0';
 563                         strlen_buf = p - buf;
 564                         if (strlen_buf == 0)
 565                                 continue; /* empty line */
 566                 }
 567
 568                 after_colon = strchr(buf, ':');
 569                 /* strange line? */
 570                 if (after_colon == NULL || *++after_colon == '\0')
 571                         goto config_error;
 572
 573                 ch = (buf[0] & ~0x20); /* toupper if it's a letter */
 574
 575                 if (ch == 'I') {
 576                         if (index_page != index_html)
 577                                 free((char*)index_page);
 578                         index_page = xstrdup(after_colon);
 579                         continue;
 580                 }
 581
 582                 /* do not allow jumping around using H in subdir's configs */
 583                 if (flag == FIRST_PARSE && ch == 'H') {
 584                         home_httpd = xstrdup(after_colon);
 585                         xchdir(home_httpd);
 586                         continue;
 587                 }
 588
 589                 if (ch == 'A' || ch == 'D') {
 590                         Htaccess_IP *pip;
 591
 592                         if (*after_colon == '*') {
 593                                 if (ch == 'D') {
 594                                         /* memorize "deny all" */
 595                                         flg_deny_all = 1;
 596                                 }
 597                                 /* skip assumed "A:*", it is a default anyway */
 598                                 continue;
 599                         }
 600                         /* store "allow/deny IP/mask" line */
 601                         pip = xzalloc(sizeof(*pip));
 602                         if (scan_ip_mask(after_colon, &pip->ip, &pip->mask)) {
 603                                 /* IP{/mask} syntax error detected, protect all */
 604                                 ch = 'D';
 605                                 pip->mask = 0;
 606                         }
 607                         pip->allow_deny = ch;
 608                         if (ch == 'D') {
 609                                 /* Deny:from_IP - prepend */
 610                                 pip->next = ip_a_d;
 611                                 ip_a_d = pip;
 612                         } else {
 613                                 /* A:from_IP - append (thus all D's precedes A's) */
 614                                 Htaccess_IP *prev_IP = ip_a_d;
 615                                 if (prev_IP == NULL) {
 616                                         ip_a_d = pip;
 617                                 } else {
 618                                         while (prev_IP->next)
 619                                                 prev_IP = prev_IP->next;
 620                                         prev_IP->next = pip;
 621                                 }
 622                         }
 623                         continue;
 624                 }
 625
 626 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 627                 if (flag == FIRST_PARSE && ch == 'E') {
 628                         unsigned i;
 629                         int status = atoi(buf + 1); /* error status code */
 630
 631                         if (status < HTTP_CONTINUE) {
 632                                 goto config_error;
 633                         }
 634                         /* then error page; find matching status */
 635                         for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
 636                                 if (http_response_type[i] == status) {
 637                                         /* We chdir to home_httpd, thus no need to
 638                                          * concat_path_file(home_httpd, after_colon)
 639                                          * here */
 640                                         http_error_page[i] = xstrdup(after_colon);
 641                                         break;
 642                                 }
 643                         }
 644                         continue;
 645                 }
 646 #endif
 647
 648 #if ENABLE_FEATURE_HTTPD_PROXY
 649                 if (flag == FIRST_PARSE && ch == 'P') {
 650                         /* P:/url:[http://]hostname[:port]/new/path */
 651                         char *url_from, *host_port, *url_to;
 652                         Htaccess_Proxy *proxy_entry;
 653
 654                         url_from = after_colon;
 655                         host_port = strchr(after_colon, ':');
 656                         if (host_port == NULL) {
 657                                 goto config_error;
 658                         }
 659                         *host_port++ = '\0';
 660                         if (strncmp(host_port, "http://", 7) == 0)
 661                                 host_port += 7;
 662                         if (*host_port == '\0') {
 663                                 goto config_error;
 664                         }
 665                         url_to = strchr(host_port, '/');
 666                         if (url_to == NULL) {
 667                                 goto config_error;
 668                         }
 669                         *url_to = '\0';
 670                         proxy_entry = xzalloc(sizeof(*proxy_entry));
 671                         proxy_entry->url_from = xstrdup(url_from);
 672                         proxy_entry->host_port = xstrdup(host_port);
 673                         *url_to = '/';
 674                         proxy_entry->url_to = xstrdup(url_to);
 675                         proxy_entry->next = proxy;
 676                         proxy = proxy_entry;
 677                         continue;
 678                 }
 679 #endif
 680                 /* the rest of directives are non-alphabetic,
 681                  * must avoid using "toupper'ed" ch */
 682                 ch = buf[0];
 683
 684                 if (ch == '.' /* ".ext:mime/type" */
 685 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 686                  || (ch == '*' && buf[1] == '.') /* "*.php:/path/php" */
 687 #endif
 688                 ) {
 689                         char *p;
 690                         Htaccess *cur;
 691
 692                         cur = xzalloc(sizeof(*cur) /* includes space for NUL */ + strlen_buf);
 693                         strcpy(cur->before_colon, buf);
 694                         p = cur->before_colon + (after_colon - buf);
 695                         p[-1] = '\0';
 696                         cur->after_colon = p;
 697                         if (ch == '.') {
 698                                 /* .mime line: prepend to mime_a list */
 699                                 cur->next = mime_a;
 700                                 mime_a = cur;
 701                         }
 702 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 703                         else {
 704                                 /* script interpreter line: prepend to script_i list */
 705                                 cur->next = script_i;
 706                                 script_i = cur;
 707                         }
 708 #endif
 709                         continue;
 710                 }
 711
 712 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 713                 if (ch == '/') { /* "/file:user:pass" */
 714                         char *p;
 715                         Htaccess *cur;
 716                         unsigned file_len;
 717
 718                         /* note: path is "" unless we are in SUBDIR parse,
 719                          * otherwise it does NOT start with "/" */
 720                         cur = xzalloc(sizeof(*cur) /* includes space for NUL */
 721                                 + 1 + strlen(path)
 722                                 + strlen_buf
 723                                 );
 724                         /* form "/path/file" */
 725                         sprintf(cur->before_colon, "/%s%.*s",
 726                                 path,
 727                                 (int) (after_colon - buf - 1), /* includes "/", but not ":" */
 728                                 buf);
 729                         /* canonicalize it */
 730                         p = bb_simplify_abs_path_inplace(cur->before_colon);
 731                         file_len = p - cur->before_colon;
 732                         /* add "user:pass" after NUL */
 733                         strcpy(++p, after_colon);
 734                         cur->after_colon = p;
 735
 736                         /* insert cur into g_auth */
 737                         /* g_auth is sorted by decreased filename length */
 738                         {
 739                                 Htaccess *auth, **authp;
 740
 741                                 authp = &g_auth;
 742                                 while ((auth = *authp) != NULL) {
 743                                         if (file_len >= strlen(auth->before_colon)) {
 744                                                 /* insert cur before auth */
 745                                                 cur->next = auth;
 746                                                 break;
 747                                         }
 748                                         authp = &auth->next;
 749                                 }
 750                                 *authp = cur;
 751                         }
 752                         continue;
 753                 }
 754 #endif /* BASIC_AUTH */
 755
 756                 /* the line is not recognized */
 757  config_error:
 758                 bb_error_msg("config error '%s' in '%s'", buf, filename);
 759          } /* while (fgets) */
 760
 761          fclose(f);
 762 }
 763
 764 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
 765 /*
 766  * Given a string, html-encode special characters.
 767  * This is used for the -e command line option to provide an easy way
 768  * for scripts to encode result data without confusing browsers.  The
 769  * returned string pointer is memory allocated by malloc().
 770  *
 771  * Returns a pointer to the encoded string (malloced).
 772  */
 773 static char *encodeString(const char *string)
 774 {
 775         /* take the simple route and encode everything */
 776         /* could possibly scan once to get length.     */
 777         int len = strlen(string);
 778         char *out = xmalloc(len * 6 + 1);
 779         char *p = out;
 780         char ch;
 781
 782         while ((ch = *string++) != '\0') {
 783                 /* very simple check for what to encode */
 784                 if (isalnum(ch))
 785                         *p++ = ch;
 786                 else
 787                         p += sprintf(p, "&#%d;", (unsigned char) ch);
 788         }
 789         *p = '\0';
 790         return out;
 791 }
 792 #endif
 793
 794 /*
 795  * Given a URL encoded string, convert it to plain ascii.
 796  * Since decoding always makes strings smaller, the decode is done in-place.
 797  * Thus, callers should xstrdup() the argument if they do not want the
 798  * argument modified.  The return is the original pointer, allowing this
 799  * function to be easily used as arguments to other functions.
 800  *
 801  * string    The first string to decode.
 802  * option_d  1 if called for httpd -d
 803  *
 804  * Returns a pointer to the decoded string (same as input).
 805  */
 806 static unsigned hex_to_bin(unsigned char c)
 807 {
 808         unsigned v;
 809
 810         v = c - '0';
 811         if (v <= 9)
 812                 return v;
 813         /* c | 0x20: letters to lower case, non-letters
 814          * to (potentially different) non-letters */
 815         v = (unsigned)(c | 0x20) - 'a';
 816         if (v <= 5)
 817                 return v + 10;
 818         return ~0;
 819 /* For testing:
 820 void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
 821 int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
 822 t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
 823 */
 824 }
 825 static char *decodeString(char *orig, int option_d)
 826 {
 827         /* note that decoded string is always shorter than original */
 828         char *string = orig;
 829         char *ptr = string;
 830         char c;
 831
 832         while ((c = *ptr++) != '\0') {
 833                 unsigned v;
 834
 835                 if (option_d && c == '+') {
 836                         *string++ = ' ';
 837                         continue;
 838                 }
 839                 if (c != '%') {
 840                         *string++ = c;
 841                         continue;
 842                 }
 843                 v = hex_to_bin(ptr[0]);
 844                 if (v > 15) {
 845  bad_hex:
 846                         if (!option_d)
 847                                 return NULL;
 848                         *string++ = '%';
 849                         continue;
 850                 }
 851                 v = (v * 16) | hex_to_bin(ptr[1]);
 852                 if (v > 255)
 853                         goto bad_hex;
 854                 if (!option_d && (v == '/' || v == '\0')) {
 855                         /* caller takes it as indication of invalid
 856                          * (dangerous wrt exploits) chars */
 857                         return orig + 1;
 858                 }
 859                 *string++ = v;
 860                 ptr += 2;
 861         }
 862         *string = '\0';
 863         return orig;
 864 }
 865
 866 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 867 /*
 868  * Decode a base64 data stream as per rfc1521.
 869  * Note that the rfc states that non base64 chars are to be ignored.
 870  * Since the decode always results in a shorter size than the input,
 871  * it is OK to pass the input arg as an output arg.
 872  * Parameter: a pointer to a base64 encoded string.
 873  * Decoded data is stored in-place.
 874  */
 875 static void decodeBase64(char *Data)
 876 {
 877         const unsigned char *in = (const unsigned char *)Data;
 878         /* The decoded size will be at most 3/4 the size of the encoded */
 879         unsigned ch = 0;
 880         int i = 0;
 881
 882         while (*in) {
 883                 int t = *in++;
 884
 885                 if (t >= '0' && t <= '9')
 886                         t = t - '0' + 52;
 887                 else if (t >= 'A' && t <= 'Z')
 888                         t = t - 'A';
 889                 else if (t >= 'a' && t <= 'z')
 890                         t = t - 'a' + 26;
 891                 else if (t == '+')
 892                         t = 62;
 893                 else if (t == '/')
 894                         t = 63;
 895                 else if (t == '=')
 896                         t = 0;
 897                 else
 898                         continue;
 899
 900                 ch = (ch << 6) | t;
 901                 i++;
 902                 if (i == 4) {
 903                         *Data++ = (char) (ch >> 16);
 904                         *Data++ = (char) (ch >> 8);
 905                         *Data++ = (char) ch;
 906                         i = 0;
 907                 }
 908         }
 909         *Data = '\0';
 910 }
 911 #endif
 912
 913 /*
 914  * Create a listen server socket on the designated port.
 915  */
 916 static int openServer(void)
 917 {
 918         unsigned n = bb_strtou(bind_addr_or_port, NULL, 10);
 919         if (!errno && n && n <= 0xffff)
 920                 n = create_and_bind_stream_or_die(NULL, n);
 921         else
 922                 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
 923         xlisten(n, 9);
 924         return n;
 925 }
 926
 927 /*
 928  * Log the connection closure and exit.
 929  */
 930 static void log_and_exit(void) NORETURN;
 931 static void log_and_exit(void)
 932 {
 933         /* Paranoia. IE said to be buggy. It may send some extra data
 934          * or be confused by us just exiting without SHUT_WR. Oh well. */
 935         shutdown(1, SHUT_WR);
 936         /* Why??
 937         (this also messes up stdin when user runs httpd -i from terminal)
 938         ndelay_on(0);
 939         while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0)
 940                 continue;
 941         */
 942
 943         if (verbose > 2)
 944                 bb_error_msg("closed");
 945         _exit(xfunc_error_retval);
 946 }
 947
 948 /*
 949  * Create and send HTTP response headers.
 950  * The arguments are combined and sent as one write operation.  Note that
 951  * IE will puke big-time if the headers are not sent in one packet and the
 952  * second packet is delayed for any reason.
 953  * responseNum - the result code to send.
 954  */
 955 static void send_headers(int responseNum)
 956 {
 957         static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
 958
 959         const char *responseString = "";
 960         const char *infoString = NULL;
 961         const char *mime_type;
 962 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 963         const char *error_page = NULL;
 964 #endif
 965         unsigned i;
 966         time_t timer = time(NULL);
 967         char tmp_str[80];
 968         int len;
 969
 970         for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
 971                 if (http_response_type[i] == responseNum) {
 972                         responseString = http_response[i].name;
 973                         infoString = http_response[i].info;
 974 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 975                         error_page = http_error_page[i];
 976 #endif
 977                         break;
 978                 }
 979         }
 980         /* error message is HTML */
 981         mime_type = responseNum == HTTP_OK ?
 982                                 found_mime_type : "text/html";
 983
 984         if (verbose)
 985                 bb_error_msg("response:%u", responseNum);
 986
 987         /* emit the current date */
 988         strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
 989         len = sprintf(iobuf,
 990                         "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
 991                         "Date: %s\r\nConnection: close\r\n",
 992                         responseNum, responseString, mime_type, tmp_str);
 993
 994 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 995         if (responseNum == HTTP_UNAUTHORIZED) {
 996                 len += sprintf(iobuf + len,
 997                                 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
 998                                 g_realm);
 999         }
1000 #endif
1001         if (responseNum == HTTP_MOVED_TEMPORARILY) {
1002                 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
1003                                 found_moved_temporarily,
1004                                 (g_query ? "?" : ""),
1005                                 (g_query ? g_query : ""));
1006         }
1007
1008 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
1009         if (error_page && access(error_page, R_OK) == 0) {
1010                 strcat(iobuf, "\r\n");
1011                 len += 2;
1012
1013                 if (DEBUG)
1014                         fprintf(stderr, "headers: '%s'\n", iobuf);
1015                 full_write(STDOUT_FILENO, iobuf, len);
1016                 if (DEBUG)
1017                         fprintf(stderr, "writing error page: '%s'\n", error_page);
1018                 return send_file_and_exit(error_page, SEND_BODY);
1019         }
1020 #endif
1021
1022         if (file_size != -1) {    /* file */
1023                 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
1024 #if ENABLE_FEATURE_HTTPD_RANGES
1025                 if (responseNum == HTTP_PARTIAL_CONTENT) {
1026                         len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"u-%"OFF_FMT"u/%"OFF_FMT"u\r\n",
1027                                         range_start,
1028                                         range_end,
1029                                         file_size);
1030                         file_size = range_end - range_start + 1;
1031                 }
1032 #endif
1033                 len += sprintf(iobuf + len,
1034 #if ENABLE_FEATURE_HTTPD_RANGES
1035                         "Accept-Ranges: bytes\r\n"
1036 #endif
1037                         "Last-Modified: %s\r\n%s %"OFF_FMT"u\r\n",
1038                                 tmp_str,
1039                                 content_gzip ? "Transfer-length:" : "Content-length:",
1040                                 file_size
1041                 );
1042         }
1043
1044         if (content_gzip)
1045                 len += sprintf(iobuf + len, "Content-Encoding: gzip\r\n");
1046
1047         iobuf[len++] = '\r';
1048         iobuf[len++] = '\n';
1049         if (infoString) {
1050                 len += sprintf(iobuf + len,
1051                                 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
1052                                 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
1053                                 responseNum, responseString,
1054                                 responseNum, responseString, infoString);
1055         }
1056         if (DEBUG)
1057                 fprintf(stderr, "headers: '%s'\n", iobuf);
1058         if (full_write(STDOUT_FILENO, iobuf, len) != len) {
1059                 if (verbose > 1)
1060                         bb_perror_msg("error");
1061                 log_and_exit();
1062         }
1063 }
1064
1065 static void send_headers_and_exit(int responseNum) NORETURN;
1066 static void send_headers_and_exit(int responseNum)
1067 {
1068         send_headers(responseNum);
1069         log_and_exit();
1070 }
1071
1072 /*
1073  * Read from the socket until '\n' or EOF. '\r' chars are removed.
1074  * '\n' is replaced with NUL.
1075  * Return number of characters read or 0 if nothing is read
1076  * ('\r' and '\n' are not counted).
1077  * Data is returned in iobuf.
1078  */
1079 static int get_line(void)
1080 {
1081         int count = 0;
1082         char c;
1083
1084         alarm(HEADER_READ_TIMEOUT);
1085         while (1) {
1086                 if (hdr_cnt <= 0) {
1087                         hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1088                         if (hdr_cnt <= 0)
1089                                 break;
1090                         hdr_ptr = hdr_buf;
1091                 }
1092                 iobuf[count] = c = *hdr_ptr++;
1093                 hdr_cnt--;
1094
1095                 if (c == '\r')
1096                         continue;
1097                 if (c == '\n') {
1098                         iobuf[count] = '\0';
1099                         break;
1100                 }
1101                 if (count < (IOBUF_SIZE - 1))      /* check overflow */
1102                         count++;
1103         }
1104         return count;
1105 }
1106
1107 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1108
1109 /* gcc 4.2.1 fares better with NOINLINE */
1110 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN;
1111 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1112 {
1113         enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1114         struct pollfd pfd[3];
1115         int out_cnt; /* we buffer a bit of initial CGI output */
1116         int count;
1117
1118         /* iobuf is used for CGI -> network data,
1119          * hdr_buf is for network -> CGI data (POSTDATA) */
1120
1121         /* If CGI dies, we still want to correctly finish reading its output
1122          * and send it to the peer. So please no SIGPIPEs! */
1123         signal(SIGPIPE, SIG_IGN);
1124
1125         // We inconsistently handle a case when more POSTDATA from network
1126         // is coming than we expected. We may give *some part* of that
1127         // extra data to CGI.
1128
1129         //if (hdr_cnt > post_len) {
1130         //      /* We got more POSTDATA from network than we expected */
1131         //      hdr_cnt = post_len;
1132         //}
1133         post_len -= hdr_cnt;
1134         /* post_len - number of POST bytes not yet read from network */
1135
1136         /* NB: breaking out of this loop jumps to log_and_exit() */
1137         out_cnt = 0;
1138         while (1) {
1139                 memset(pfd, 0, sizeof(pfd));
1140
1141                 pfd[FROM_CGI].fd = fromCgi_rd;
1142                 pfd[FROM_CGI].events = POLLIN;
1143
1144                 if (toCgi_wr) {
1145                         pfd[TO_CGI].fd = toCgi_wr;
1146                         if (hdr_cnt > 0) {
1147                                 pfd[TO_CGI].events = POLLOUT;
1148                         } else if (post_len > 0) {
1149                                 pfd[0].events = POLLIN;
1150                         } else {
1151                                 /* post_len <= 0 && hdr_cnt <= 0:
1152                                  * no more POST data to CGI,
1153                                  * let CGI see EOF on CGI's stdin */
1154                                 if (toCgi_wr != fromCgi_rd)
1155                                         close(toCgi_wr);
1156                                 toCgi_wr = 0;
1157                         }
1158                 }
1159
1160                 /* Now wait on the set of sockets */
1161                 count = safe_poll(pfd, toCgi_wr ? TO_CGI+1 : FROM_CGI+1, -1);
1162                 if (count <= 0) {
1163 #if 0
1164                         if (safe_waitpid(pid, &status, WNOHANG) <= 0) {
1165                                 /* Weird. CGI didn't exit and no fd's
1166                                  * are ready, yet poll returned?! */
1167                                 continue;
1168                         }
1169                         if (DEBUG && WIFEXITED(status))
1170                                 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1171                         if (DEBUG && WIFSIGNALED(status))
1172                                 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1173 #endif
1174                         break;
1175                 }
1176
1177                 if (pfd[TO_CGI].revents) {
1178                         /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */
1179                         /* Have data from peer and can write to CGI */
1180                         count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1181                         /* Doesn't happen, we dont use nonblocking IO here
1182                          *if (count < 0 && errno == EAGAIN) {
1183                          *      ...
1184                          *} else */
1185                         if (count > 0) {
1186                                 hdr_ptr += count;
1187                                 hdr_cnt -= count;
1188                         } else {
1189                                 /* EOF/broken pipe to CGI, stop piping POST data */
1190                                 hdr_cnt = post_len = 0;
1191                         }
1192                 }
1193
1194                 if (pfd[0].revents) {
1195                         /* post_len > 0 && hdr_cnt == 0 here */
1196                         /* We expect data, prev data portion is eaten by CGI
1197                          * and there *is* data to read from the peer
1198                          * (POSTDATA) */
1199                         //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
1200                         //count = safe_read(STDIN_FILENO, hdr_buf, count);
1201                         count = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1202                         if (count > 0) {
1203                                 hdr_cnt = count;
1204                                 hdr_ptr = hdr_buf;
1205                                 post_len -= count;
1206                         } else {
1207                                 /* no more POST data can be read */
1208                                 post_len = 0;
1209                         }
1210                 }
1211
1212                 if (pfd[FROM_CGI].revents) {
1213                         /* There is something to read from CGI */
1214                         char *rbuf = iobuf;
1215
1216                         /* Are we still buffering CGI output? */
1217                         if (out_cnt >= 0) {
1218                                 /* HTTP_200[] has single "\r\n" at the end.
1219                                  * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1220                                  * CGI scripts MUST send their own header terminated by
1221                                  * empty line, then data. That's why we have only one
1222                                  * <cr><lf> pair here. We will output "200 OK" line
1223                                  * if needed, but CGI still has to provide blank line
1224                                  * between header and body */
1225
1226                                 /* Must use safe_read, not full_read, because
1227                                  * CGI may output a few first bytes and then wait
1228                                  * for POSTDATA without closing stdout.
1229                                  * With full_read we may wait here forever. */
1230                                 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1231                                 if (count <= 0) {
1232                                         /* eof (or error) and there was no "HTTP",
1233                                          * so write it, then write received data */
1234                                         if (out_cnt) {
1235                                                 full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1);
1236                                                 full_write(STDOUT_FILENO, rbuf, out_cnt);
1237                                         }
1238                                         break; /* CGI stdout is closed, exiting */
1239                                 }
1240                                 out_cnt += count;
1241                                 count = 0;
1242                                 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1243                                 if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1244                                         /* send "HTTP/1.0 " */
1245                                         if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9)
1246                                                 break;
1247                                         rbuf += 8; /* skip "Status: " */
1248                                         count = out_cnt - 8;
1249                                         out_cnt = -1; /* buffering off */
1250                                 } else if (out_cnt >= 4) {
1251                                         /* Did CGI add "HTTP"? */
1252                                         if (memcmp(rbuf, HTTP_200, 4) != 0) {
1253                                                 /* there is no "HTTP", do it ourself */
1254                                                 if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1255                                                         break;
1256                                         }
1257                                         /* Commented out:
1258                                         if (!strstr(rbuf, "ontent-")) {
1259                                                 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1260                                         }
1261                                          * Counter-example of valid CGI without Content-type:
1262                                          * echo -en "HTTP/1.0 302 Found\r\n"
1263                                          * echo -en "Location: http://www.busybox.net\r\n"
1264                                          * echo -en "\r\n"
1265                                          */
1266                                         count = out_cnt;
1267                                         out_cnt = -1; /* buffering off */
1268                                 }
1269                         } else {
1270                                 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1271                                 if (count <= 0)
1272                                         break;  /* eof (or error) */
1273                         }
1274                         if (full_write(STDOUT_FILENO, rbuf, count) != count)
1275                                 break;
1276                         if (DEBUG)
1277                                 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1278                 } /* if (pfd[FROM_CGI].revents) */
1279         } /* while (1) */
1280         log_and_exit();
1281 }
1282 #endif
1283
1284 #if ENABLE_FEATURE_HTTPD_CGI
1285
1286 static void setenv1(const char *name, const char *value)
1287 {
1288         setenv(name, value ? value : "", 1);
1289 }
1290
1291 /*
1292  * Spawn CGI script, forward CGI's stdin/out <=> network
1293  *
1294  * Environment variables are set up and the script is invoked with pipes
1295  * for stdin/stdout.  If a POST is being done the script is fed the POST
1296  * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1297  *
1298  * Parameters:
1299  * const char *url              The requested URL (with leading /).
1300  * int post_len                 Length of the POST body.
1301  * const char *cookie           For set HTTP_COOKIE.
1302  * const char *content_type     For set CONTENT_TYPE.
1303  */
1304 static void send_cgi_and_exit(
1305                 const char *url,
1306                 const char *request,
1307                 int post_len,
1308                 const char *cookie,
1309                 const char *content_type) NORETURN;
1310 static void send_cgi_and_exit(
1311                 const char *url,
1312                 const char *request,
1313                 int post_len,
1314                 const char *cookie,
1315                 const char *content_type)
1316 {
1317         struct fd_pair fromCgi;  /* CGI -> httpd pipe */
1318         struct fd_pair toCgi;    /* httpd -> CGI pipe */
1319         char *script;
1320         int pid;
1321
1322         /* Make a copy. NB: caller guarantees:
1323          * url[0] == '/', url[1] != '/' */
1324         url = xstrdup(url);
1325
1326         /*
1327          * We are mucking with environment _first_ and then vfork/exec,
1328          * this allows us to use vfork safely. Parent doesn't care about
1329          * these environment changes anyway.
1330          */
1331
1332         /* Check for [dirs/]script.cgi/PATH_INFO */
1333         script = (char*)url;
1334         while ((script = strchr(script + 1, '/')) != NULL) {
1335                 *script = '\0';
1336                 if (!is_directory(url + 1, 1, NULL)) {
1337                         /* not directory, found script.cgi/PATH_INFO */
1338                         *script = '/';
1339                         break;
1340                 }
1341                 *script = '/'; /* is directory, find next '/' */
1342         }
1343         setenv1("PATH_INFO", script);   /* set to /PATH_INFO or "" */
1344         setenv1("REQUEST_METHOD", request);
1345         if (g_query) {
1346                 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", url, g_query));
1347         } else {
1348                 setenv1("REQUEST_URI", url);
1349         }
1350         if (script != NULL)
1351                 *script = '\0';         /* cut off /PATH_INFO */
1352
1353         /* SCRIPT_FILENAME is required by PHP in CGI mode */
1354         if (home_httpd[0] == '/') {
1355                 char *fullpath = concat_path_file(home_httpd, url);
1356                 setenv1("SCRIPT_FILENAME", fullpath);
1357         }
1358         /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1359         setenv1("SCRIPT_NAME", url);
1360         /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1361          * QUERY_STRING: The information which follows the ? in the URL
1362          * which referenced this script. This is the query information.
1363          * It should not be decoded in any fashion. This variable
1364          * should always be set when there is query information,
1365          * regardless of command line decoding. */
1366         /* (Older versions of bbox seem to do some decoding) */
1367         setenv1("QUERY_STRING", g_query);
1368         putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1369         putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1370         putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1371         /* Having _separate_ variables for IP and port defeats
1372          * the purpose of having socket abstraction. Which "port"
1373          * are you using on Unix domain socket?
1374          * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1375          * Oh well... */
1376         {
1377                 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1378                 char *cp = strrchr(p, ':');
1379                 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1380                         cp = NULL;
1381                 if (cp) *cp = '\0'; /* delete :PORT */
1382                 setenv1("REMOTE_ADDR", p);
1383                 if (cp) {
1384                         *cp = ':';
1385 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1386                         setenv1("REMOTE_PORT", cp + 1);
1387 #endif
1388                 }
1389         }
1390         setenv1("HTTP_USER_AGENT", user_agent);
1391         if (http_accept)
1392                 setenv1("HTTP_ACCEPT", http_accept);
1393         if (http_accept_language)
1394                 setenv1("HTTP_ACCEPT_LANGUAGE", http_accept_language);
1395         if (post_len)
1396                 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1397         if (cookie)
1398                 setenv1("HTTP_COOKIE", cookie);
1399         if (content_type)
1400                 setenv1("CONTENT_TYPE", content_type);
1401 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1402         if (remoteuser) {
1403                 setenv1("REMOTE_USER", remoteuser);
1404                 putenv((char*)"AUTH_TYPE=Basic");
1405         }
1406 #endif
1407         if (referer)
1408                 setenv1("HTTP_REFERER", referer);
1409         setenv1("HTTP_HOST", host); /* set to "" if NULL */
1410         /* setenv1("SERVER_NAME", safe_gethostname()); - don't do this,
1411          * just run "env SERVER_NAME=xyz httpd ..." instead */
1412
1413         xpiped_pair(fromCgi);
1414         xpiped_pair(toCgi);
1415
1416         pid = vfork();
1417         if (pid < 0) {
1418                 /* TODO: log perror? */
1419                 log_and_exit();
1420         }
1421
1422         if (!pid) {
1423                 /* Child process */
1424                 char *argv[3];
1425
1426                 xfunc_error_retval = 242;
1427
1428                 /* NB: close _first_, then move fds! */
1429                 close(toCgi.wr);
1430                 close(fromCgi.rd);
1431                 xmove_fd(toCgi.rd, 0);  /* replace stdin with the pipe */
1432                 xmove_fd(fromCgi.wr, 1);  /* replace stdout with the pipe */
1433                 /* User seeing stderr output can be a security problem.
1434                  * If CGI really wants that, it can always do dup itself. */
1435                 /* dup2(1, 2); */
1436
1437                 /* Chdiring to script's dir */
1438                 script = strrchr(url, '/');
1439                 if (script != url) { /* paranoia */
1440                         *script = '\0';
1441                         if (chdir(url + 1) != 0) {
1442                                 bb_perror_msg("chdir(%s)", url + 1);
1443                                 goto error_execing_cgi;
1444                         }
1445                         // not needed: *script = '/';
1446                 }
1447                 script++;
1448
1449                 /* set argv[0] to name without path */
1450                 argv[0] = script;
1451                 argv[1] = NULL;
1452
1453 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1454                 {
1455                         char *suffix = strrchr(script, '.');
1456
1457                         if (suffix) {
1458                                 Htaccess *cur;
1459                                 for (cur = script_i; cur; cur = cur->next) {
1460                                         if (strcmp(cur->before_colon + 1, suffix) == 0) {
1461                                                 /* found interpreter name */
1462                                                 argv[0] = cur->after_colon;
1463                                                 argv[1] = script;
1464                                                 argv[2] = NULL;
1465                                                 break;
1466                                         }
1467                                 }
1468                         }
1469                 }
1470 #endif
1471                 /* restore default signal dispositions for CGI process */
1472                 bb_signals(0
1473                         | (1 << SIGCHLD)
1474                         | (1 << SIGPIPE)
1475                         | (1 << SIGHUP)
1476                         , SIG_DFL);
1477
1478                 /* _NOT_ execvp. We do not search PATH. argv[0] is a filename
1479                  * without any dir components and will only match a file
1480                  * in the current directory */
1481                 execv(argv[0], argv);
1482                 if (verbose)
1483                         bb_perror_msg("can't execute '%s'", argv[0]);
1484  error_execing_cgi:
1485                 /* send to stdout
1486                  * (we are CGI here, our stdout is pumped to the net) */
1487                 send_headers_and_exit(HTTP_NOT_FOUND);
1488         } /* end child */
1489
1490         /* Parent process */
1491
1492         /* Restore variables possibly changed by child */
1493         xfunc_error_retval = 0;
1494
1495         /* Pump data */
1496         close(fromCgi.wr);
1497         close(toCgi.rd);
1498         cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1499 }
1500
1501 #endif          /* FEATURE_HTTPD_CGI */
1502
1503 /*
1504  * Send a file response to a HTTP request, and exit
1505  *
1506  * Parameters:
1507  * const char *url  The requested URL (with leading /).
1508  * what             What to send (headers/body/both).
1509  */
1510 static NOINLINE void send_file_and_exit(const char *url, int what)
1511 {
1512         char *suffix;
1513         int fd;
1514         ssize_t count;
1515
1516         if (content_gzip) {
1517                 /* does <url>.gz exist? Then use it instead */
1518                 char *gzurl = xasprintf("%s.gz", url);
1519                 fd = open(gzurl, O_RDONLY);
1520                 free(gzurl);
1521                 if (fd != -1) {
1522                         struct stat sb;
1523                         fstat(fd, &sb);
1524                         file_size = sb.st_size;
1525                 } else {
1526                         IF_FEATURE_HTTPD_GZIP(content_gzip = 0;)
1527                         fd = open(url, O_RDONLY);
1528                 }
1529         } else {
1530                 fd = open(url, O_RDONLY);
1531         }
1532         if (fd < 0) {
1533                 if (DEBUG)
1534                         bb_perror_msg("can't open '%s'", url);
1535                 /* Error pages are sent by using send_file_and_exit(SEND_BODY).
1536                  * IOW: it is unsafe to call send_headers_and_exit
1537                  * if what is SEND_BODY! Can recurse! */
1538                 if (what != SEND_BODY)
1539                         send_headers_and_exit(HTTP_NOT_FOUND);
1540                 log_and_exit();
1541         }
1542         /* If you want to know about EPIPE below
1543          * (happens if you abort downloads from local httpd): */
1544         signal(SIGPIPE, SIG_IGN);
1545
1546         /* If not found, default is "application/octet-stream" */
1547         found_mime_type = "application/octet-stream";
1548         suffix = strrchr(url, '.');
1549         if (suffix) {
1550                 static const char suffixTable[] ALIGN1 =
1551                         /* Shorter suffix must be first:
1552                          * ".html.htm" will fail for ".htm"
1553                          */
1554                         ".txt.h.c.cc.cpp\0" "text/plain\0"
1555                         /* .htm line must be after .h line */
1556                         ".htm.html\0" "text/html\0"
1557                         ".jpg.jpeg\0" "image/jpeg\0"
1558                         ".gif\0"      "image/gif\0"
1559                         ".png\0"      "image/png\0"
1560                         /* .css line must be after .c line */
1561                         ".css\0"      "text/css\0"
1562                         ".wav\0"      "audio/wav\0"
1563                         ".avi\0"      "video/x-msvideo\0"
1564                         ".qt.mov\0"   "video/quicktime\0"
1565                         ".mpe.mpeg\0" "video/mpeg\0"
1566                         ".mid.midi\0" "audio/midi\0"
1567                         ".mp3\0"      "audio/mpeg\0"
1568 #if 0  /* unpopular */
1569                         ".au\0"       "audio/basic\0"
1570                         ".pac\0"      "application/x-ns-proxy-autoconfig\0"
1571                         ".vrml.wrl\0" "model/vrml\0"
1572 #endif
1573                         /* compiler adds another "\0" here */
1574                 ;
1575                 Htaccess *cur;
1576
1577                 /* Examine built-in table */
1578                 const char *table = suffixTable;
1579                 const char *table_next;
1580                 for (; *table; table = table_next) {
1581                         const char *try_suffix;
1582                         const char *mime_type;
1583                         mime_type  = table + strlen(table) + 1;
1584                         table_next = mime_type + strlen(mime_type) + 1;
1585                         try_suffix = strstr(table, suffix);
1586                         if (!try_suffix)
1587                                 continue;
1588                         try_suffix += strlen(suffix);
1589                         if (*try_suffix == '\0' || *try_suffix == '.') {
1590                                 found_mime_type = mime_type;
1591                                 break;
1592                         }
1593                         /* Example: strstr(table, ".av") != NULL, but it
1594                          * does not match ".avi" after all and we end up here.
1595                          * The table is arranged so that in this case we know
1596                          * that it can't match anything in the following lines,
1597                          * and we stop the search: */
1598                         break;
1599                 }
1600                 /* ...then user's table */
1601                 for (cur = mime_a; cur; cur = cur->next) {
1602                         if (strcmp(cur->before_colon, suffix) == 0) {
1603                                 found_mime_type = cur->after_colon;
1604                                 break;
1605                         }
1606                 }
1607         }
1608
1609         if (DEBUG)
1610                 bb_error_msg("sending file '%s' content-type: %s",
1611                         url, found_mime_type);
1612
1613 #if ENABLE_FEATURE_HTTPD_RANGES
1614         if (what == SEND_BODY /* err pages and ranges don't mix */
1615          || content_gzip /* we are sending compressed page: can't do ranges */  ///why?
1616         ) {
1617                 range_start = 0;
1618         }
1619         range_len = MAXINT(off_t);
1620         if (range_start) {
1621                 if (!range_end) {
1622                         range_end = file_size - 1;
1623                 }
1624                 if (range_end < range_start
1625                  || lseek(fd, range_start, SEEK_SET) != range_start
1626                 ) {
1627                         lseek(fd, 0, SEEK_SET);
1628                         range_start = 0;
1629                 } else {
1630                         range_len = range_end - range_start + 1;
1631                         send_headers(HTTP_PARTIAL_CONTENT);
1632                         what = SEND_BODY;
1633                 }
1634         }
1635 #endif
1636         if (what & SEND_HEADERS)
1637                 send_headers(HTTP_OK);
1638 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1639         {
1640                 off_t offset = range_start;
1641                 while (1) {
1642                         /* sz is rounded down to 64k */
1643                         ssize_t sz = MAXINT(ssize_t) - 0xffff;
1644                         IF_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1645                         count = sendfile(STDOUT_FILENO, fd, &offset, sz);
1646                         if (count < 0) {
1647                                 if (offset == range_start)
1648                                         break; /* fall back to read/write loop */
1649                                 goto fin;
1650                         }
1651                         IF_FEATURE_HTTPD_RANGES(range_len -= sz;)
1652                         if (count == 0 || range_len == 0)
1653                                 log_and_exit();
1654                 }
1655         }
1656 #endif
1657         while ((count = safe_read(fd, iobuf, IOBUF_SIZE)) > 0) {
1658                 ssize_t n;
1659                 IF_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1660                 n = full_write(STDOUT_FILENO, iobuf, count);
1661                 if (count != n)
1662                         break;
1663                 IF_FEATURE_HTTPD_RANGES(range_len -= count;)
1664                 if (range_len == 0)
1665                         break;
1666         }
1667         if (count < 0) {
1668  IF_FEATURE_HTTPD_USE_SENDFILE(fin:)
1669                 if (verbose > 1)
1670                         bb_perror_msg("error");
1671         }
1672         log_and_exit();
1673 }
1674
1675 static int checkPermIP(void)
1676 {
1677         Htaccess_IP *cur;
1678
1679         for (cur = ip_a_d; cur; cur = cur->next) {
1680 #if DEBUG
1681                 fprintf(stderr,
1682                         "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1683                         rmt_ip_str,
1684                         (unsigned char)(cur->ip >> 24),
1685                         (unsigned char)(cur->ip >> 16),
1686                         (unsigned char)(cur->ip >> 8),
1687                         (unsigned char)(cur->ip),
1688                         (unsigned char)(cur->mask >> 24),
1689                         (unsigned char)(cur->mask >> 16),
1690                         (unsigned char)(cur->mask >> 8),
1691                         (unsigned char)(cur->mask)
1692                 );
1693 #endif
1694                 if ((rmt_ip & cur->mask) == cur->ip)
1695                         return (cur->allow_deny == 'A'); /* A -> 1 */
1696         }
1697
1698         return !flg_deny_all; /* depends on whether we saw "D:*" */
1699 }
1700
1701 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1702 /*
1703  * Config file entries are of the form "/<path>:<user>:<passwd>".
1704  * If config file has no prefix match for path, access is allowed.
1705  *
1706  * path                 The file path
1707  * user_and_passwd      "user:passwd" to validate
1708  *
1709  * Returns 1 if user_and_passwd is OK.
1710  */
1711 static int check_user_passwd(const char *path, const char *user_and_passwd)
1712 {
1713         Htaccess *cur;
1714         const char *prev = NULL;
1715
1716         for (cur = g_auth; cur; cur = cur->next) {
1717                 const char *dir_prefix;
1718                 size_t len;
1719
1720                 dir_prefix = cur->before_colon;
1721
1722                 /* WHY? */
1723                 /* If already saw a match, don't accept other different matches */
1724                 if (prev && strcmp(prev, dir_prefix) != 0)
1725                         continue;
1726
1727                 if (DEBUG)
1728                         fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd);
1729
1730                 /* If it's not a prefix match, continue searching */
1731                 len = strlen(dir_prefix);
1732                 if (len != 1 /* dir_prefix "/" matches all, don't need to check */
1733                  && (strncmp(dir_prefix, path, len) != 0
1734                     || (path[len] != '/' && path[len] != '\0'))
1735                 ) {
1736                         continue;
1737                 }
1738
1739                 /* Path match found */
1740                 prev = dir_prefix;
1741
1742                 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1743                         char *md5_passwd;
1744
1745                         md5_passwd = strchr(cur->after_colon, ':');
1746                         if (md5_passwd && md5_passwd[1] == '$' && md5_passwd[2] == '1'
1747                          && md5_passwd[3] == '$' && md5_passwd[4]
1748                         ) {
1749                                 char *encrypted;
1750                                 int r, user_len_p1;
1751
1752                                 md5_passwd++;
1753                                 user_len_p1 = md5_passwd - cur->after_colon;
1754                                 /* comparing "user:" */
1755                                 if (strncmp(cur->after_colon, user_and_passwd, user_len_p1) != 0) {
1756                                         continue;
1757                                 }
1758
1759                                 encrypted = pw_encrypt(
1760                                         user_and_passwd + user_len_p1 /* cleartext pwd from user */,
1761                                         md5_passwd /*salt */, 1 /* cleanup */);
1762                                 r = strcmp(encrypted, md5_passwd);
1763                                 free(encrypted);
1764                                 if (r == 0)
1765                                         goto set_remoteuser_var; /* Ok */
1766                                 continue;
1767                         }
1768                 }
1769
1770                 /* Comparing plaintext "user:pass" in one go */
1771                 if (strcmp(cur->after_colon, user_and_passwd) == 0) {
1772  set_remoteuser_var:
1773                         remoteuser = xstrndup(user_and_passwd,
1774                                         strchrnul(user_and_passwd, ':') - user_and_passwd);
1775                         return 1; /* Ok */
1776                 }
1777         } /* for */
1778
1779         /* 0(bad) if prev is set: matches were found but passwd was wrong */
1780         return (prev == NULL);
1781 }
1782 #endif  /* FEATURE_HTTPD_BASIC_AUTH */
1783
1784 #if ENABLE_FEATURE_HTTPD_PROXY
1785 static Htaccess_Proxy *find_proxy_entry(const char *url)
1786 {
1787         Htaccess_Proxy *p;
1788         for (p = proxy; p; p = p->next) {
1789                 if (strncmp(url, p->url_from, strlen(p->url_from)) == 0)
1790                         return p;
1791         }
1792         return NULL;
1793 }
1794 #endif
1795
1796 /*
1797  * Handle timeouts
1798  */
1799 static void send_REQUEST_TIMEOUT_and_exit(int sig) NORETURN;
1800 static void send_REQUEST_TIMEOUT_and_exit(int sig UNUSED_PARAM)
1801 {
1802         send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1803 }
1804
1805 /*
1806  * Handle an incoming http request and exit.
1807  */
1808 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN;
1809 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1810 {
1811         static const char request_GET[] ALIGN1 = "GET";
1812         struct stat sb;
1813         char *urlcopy;
1814         char *urlp;
1815         char *tptr;
1816 #if ENABLE_FEATURE_HTTPD_CGI
1817         static const char request_HEAD[] ALIGN1 = "HEAD";
1818         const char *prequest;
1819         char *cookie = NULL;
1820         char *content_type = NULL;
1821         unsigned long length = 0;
1822 #elif ENABLE_FEATURE_HTTPD_PROXY
1823 #define prequest request_GET
1824         unsigned long length = 0;
1825 #endif
1826 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1827         smallint authorized = -1;
1828 #endif
1829         smallint ip_allowed;
1830         char http_major_version;
1831 #if ENABLE_FEATURE_HTTPD_PROXY
1832         char http_minor_version;
1833         char *header_buf = header_buf; /* for gcc */
1834         char *header_ptr = header_ptr;
1835         Htaccess_Proxy *proxy_entry;
1836 #endif
1837
1838         /* Allocation of iobuf is postponed until now
1839          * (IOW, server process doesn't need to waste 8k) */
1840         iobuf = xmalloc(IOBUF_SIZE);
1841
1842         rmt_ip = 0;
1843         if (fromAddr->u.sa.sa_family == AF_INET) {
1844                 rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr);
1845         }
1846 #if ENABLE_FEATURE_IPV6
1847         if (fromAddr->u.sa.sa_family == AF_INET6
1848          && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0
1849          && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0
1850          && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1851                 rmt_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]);
1852 #endif
1853         if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1854                 /* NB: can be NULL (user runs httpd -i by hand?) */
1855                 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa);
1856         }
1857         if (verbose) {
1858                 /* this trick makes -v logging much simpler */
1859                 if (rmt_ip_str)
1860                         applet_name = rmt_ip_str;
1861                 if (verbose > 2)
1862                         bb_error_msg("connected");
1863         }
1864
1865         /* Install timeout handler. get_line() needs it. */
1866         signal(SIGALRM, send_REQUEST_TIMEOUT_and_exit);
1867
1868         if (!get_line()) /* EOF or error or empty line */
1869                 send_headers_and_exit(HTTP_BAD_REQUEST);
1870
1871         /* Determine type of request (GET/POST) */
1872         urlp = strpbrk(iobuf, " \t");
1873         if (urlp == NULL)
1874                 send_headers_and_exit(HTTP_BAD_REQUEST);
1875         *urlp++ = '\0';
1876 #if ENABLE_FEATURE_HTTPD_CGI
1877         prequest = request_GET;
1878         if (strcasecmp(iobuf, prequest) != 0) {
1879                 prequest = request_HEAD;
1880                 if (strcasecmp(iobuf, prequest) != 0) {
1881                         prequest = "POST";
1882                         if (strcasecmp(iobuf, prequest) != 0)
1883                                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1884                 }
1885         }
1886 #else
1887         if (strcasecmp(iobuf, request_GET) != 0)
1888                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1889 #endif
1890         urlp = skip_whitespace(urlp);
1891         if (urlp[0] != '/')
1892                 send_headers_and_exit(HTTP_BAD_REQUEST);
1893
1894         /* Find end of URL and parse HTTP version, if any */
1895         http_major_version = '0';
1896         IF_FEATURE_HTTPD_PROXY(http_minor_version = '0';)
1897         tptr = strchrnul(urlp, ' ');
1898         /* Is it " HTTP/"? */
1899         if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) {
1900                 http_major_version = tptr[6];
1901                 IF_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];)
1902         }
1903         *tptr = '\0';
1904
1905         /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
1906         urlcopy = alloca((tptr - urlp) + 2 + strlen(index_page));
1907         /*if (urlcopy == NULL)
1908          *      send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
1909         strcpy(urlcopy, urlp);
1910         /* NB: urlcopy ptr is never changed after this */
1911
1912         /* Extract url args if present */
1913         g_query = NULL;
1914         tptr = strchr(urlcopy, '?');
1915         if (tptr) {
1916                 *tptr++ = '\0';
1917                 g_query = tptr;
1918         }
1919
1920         /* Decode URL escape sequences */
1921         tptr = decodeString(urlcopy, 0);
1922         if (tptr == NULL)
1923                 send_headers_and_exit(HTTP_BAD_REQUEST);
1924         if (tptr == urlcopy + 1) {
1925                 /* '/' or NUL is encoded */
1926                 send_headers_and_exit(HTTP_NOT_FOUND);
1927         }
1928
1929         /* Canonicalize path */
1930         /* Algorithm stolen from libbb bb_simplify_path(),
1931          * but don't strdup, retain trailing slash, protect root */
1932         urlp = tptr = urlcopy;
1933         do {
1934                 if (*urlp == '/') {
1935                         /* skip duplicate (or initial) slash */
1936                         if (*tptr == '/') {
1937                                 continue;
1938                         }
1939                         if (*tptr == '.') {
1940                                 /* skip extra "/./" */
1941                                 if (tptr[1] == '/' || !tptr[1]) {
1942                                         continue;
1943                                 }
1944                                 /* "..": be careful */
1945                                 if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
1946                                         ++tptr;
1947                                         if (urlp == urlcopy) /* protect root */
1948                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
1949                                         while (*--urlp != '/') /* omit previous dir */;
1950                                                 continue;
1951                                 }
1952                         }
1953                 }
1954                 *++urlp = *tptr;
1955         } while (*++tptr);
1956         *++urlp = '\0';       /* terminate after last character */
1957
1958         /* If URL is a directory, add '/' */
1959         if (urlp[-1] != '/') {
1960                 if (is_directory(urlcopy + 1, 1, NULL)) {
1961                         found_moved_temporarily = urlcopy;
1962                 }
1963         }
1964
1965         /* Log it */
1966         if (verbose > 1)
1967                 bb_error_msg("url:%s", urlcopy);
1968
1969         tptr = urlcopy;
1970         ip_allowed = checkPermIP();
1971         while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
1972                 /* have path1/path2 */
1973                 *tptr = '\0';
1974                 if (is_directory(urlcopy + 1, 1, NULL)) {
1975                         /* may have subdir config */
1976                         parse_conf(urlcopy + 1, SUBDIR_PARSE);
1977                         ip_allowed = checkPermIP();
1978                 }
1979                 *tptr = '/';
1980         }
1981
1982 #if ENABLE_FEATURE_HTTPD_PROXY
1983         proxy_entry = find_proxy_entry(urlcopy);
1984         if (proxy_entry)
1985                 header_buf = header_ptr = xmalloc(IOBUF_SIZE);
1986 #endif
1987
1988         if (http_major_version >= '0') {
1989                 /* Request was with "... HTTP/nXXX", and n >= 0 */
1990
1991                 /* Read until blank line */
1992                 while (1) {
1993                         if (!get_line())
1994                                 break; /* EOF or error or empty line */
1995                         if (DEBUG)
1996                                 bb_error_msg("header: '%s'", iobuf);
1997
1998 #if ENABLE_FEATURE_HTTPD_PROXY
1999                         /* We need 2 more bytes for yet another "\r\n" -
2000                          * see near fdprintf(proxy_fd...) further below */
2001                         if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) {
2002                                 int len = strlen(iobuf);
2003                                 if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4)
2004                                         len = IOBUF_SIZE - (header_ptr - header_buf) - 4;
2005                                 memcpy(header_ptr, iobuf, len);
2006                                 header_ptr += len;
2007                                 header_ptr[0] = '\r';
2008                                 header_ptr[1] = '\n';
2009                                 header_ptr += 2;
2010                         }
2011 #endif
2012
2013 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
2014                         /* Try and do our best to parse more lines */
2015                         if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
2016                                 /* extra read only for POST */
2017                                 if (prequest != request_GET
2018 # if ENABLE_FEATURE_HTTPD_CGI
2019                                  && prequest != request_HEAD
2020 # endif
2021                                 ) {
2022                                         tptr = skip_whitespace(iobuf + sizeof("Content-length:") - 1);
2023                                         if (!tptr[0])
2024                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
2025                                         /* not using strtoul: it ignores leading minus! */
2026                                         length = bb_strtou(tptr, NULL, 10);
2027                                         /* length is "ulong", but we need to pass it to int later */
2028                                         if (errno || length > INT_MAX)
2029                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
2030                                 }
2031                         }
2032 #endif
2033 #if ENABLE_FEATURE_HTTPD_CGI
2034                         else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
2035                                 cookie = xstrdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
2036                         } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
2037                                 content_type = xstrdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
2038                         } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
2039                                 referer = xstrdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
2040                         } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
2041                                 user_agent = xstrdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
2042                         } else if (STRNCASECMP(iobuf, "Host:") == 0) {
2043                                 host = xstrdup(skip_whitespace(iobuf + sizeof("Host:")-1));
2044                         } else if (STRNCASECMP(iobuf, "Accept:") == 0) {
2045                                 http_accept = xstrdup(skip_whitespace(iobuf + sizeof("Accept:")-1));
2046                         } else if (STRNCASECMP(iobuf, "Accept-Language:") == 0) {
2047                                 http_accept_language = xstrdup(skip_whitespace(iobuf + sizeof("Accept-Language:")-1));
2048                         }
2049 #endif
2050 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2051                         if (STRNCASECMP(iobuf, "Authorization:") == 0) {
2052                                 /* We only allow Basic credentials.
2053                                  * It shows up as "Authorization: Basic <user>:<passwd>" where
2054                                  * "<user>:<passwd>" is base64 encoded.
2055                                  */
2056                                 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
2057                                 if (STRNCASECMP(tptr, "Basic") != 0)
2058                                         continue;
2059                                 tptr += sizeof("Basic")-1;
2060                                 /* decodeBase64() skips whitespace itself */
2061                                 decodeBase64(tptr);
2062                                 authorized = check_user_passwd(urlcopy, tptr);
2063                         }
2064 #endif
2065 #if ENABLE_FEATURE_HTTPD_RANGES
2066                         if (STRNCASECMP(iobuf, "Range:") == 0) {
2067                                 /* We know only bytes=NNN-[MMM] */
2068                                 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
2069                                 if (strncmp(s, "bytes=", 6) == 0) {
2070                                         s += sizeof("bytes=")-1;
2071                                         range_start = BB_STRTOOFF(s, &s, 10);
2072                                         if (s[0] != '-' || range_start < 0) {
2073                                                 range_start = 0;
2074                                         } else if (s[1]) {
2075                                                 range_end = BB_STRTOOFF(s+1, NULL, 10);
2076                                                 if (errno || range_end < range_start)
2077                                                         range_start = 0;
2078                                         }
2079                                 }
2080                         }
2081 #endif
2082 #if ENABLE_FEATURE_HTTPD_GZIP
2083                         if (STRNCASECMP(iobuf, "Accept-Encoding:") == 0) {
2084                                 /* Note: we do not support "gzip;q=0"
2085                                  * method of _disabling_ gzip
2086                                  * delivery. No one uses that, though */
2087                                 const char *s = strstr(iobuf, "gzip");
2088                                 if (s) {
2089                                         // want more thorough checks?
2090                                         //if (s[-1] == ' '
2091                                         // || s[-1] == ','
2092                                         // || s[-1] == ':'
2093                                         //) {
2094                                                 content_gzip = 1;
2095                                         //}
2096                                 }
2097                         }
2098 #endif
2099                 } /* while extra header reading */
2100         }
2101
2102         /* We are done reading headers, disable peer timeout */
2103         alarm(0);
2104
2105         if (strcmp(bb_basename(urlcopy), HTTPD_CONF) == 0 || !ip_allowed) {
2106                 /* protect listing [/path]/httpd.conf or IP deny */
2107                 send_headers_and_exit(HTTP_FORBIDDEN);
2108         }
2109
2110 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2111         /* Case: no "Authorization:" was seen, but page does require passwd.
2112          * Check that with dummy user:pass */
2113         if (authorized < 0)
2114                 authorized = check_user_passwd(urlcopy, ":");
2115         if (!authorized)
2116                 send_headers_and_exit(HTTP_UNAUTHORIZED);
2117 #endif
2118
2119         if (found_moved_temporarily) {
2120                 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
2121         }
2122
2123 #if ENABLE_FEATURE_HTTPD_PROXY
2124         if (proxy_entry != NULL) {
2125                 int proxy_fd;
2126                 len_and_sockaddr *lsa;
2127
2128                 proxy_fd = socket(AF_INET, SOCK_STREAM, 0);
2129                 if (proxy_fd < 0)
2130                         send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2131                 lsa = host2sockaddr(proxy_entry->host_port, 80);
2132                 if (lsa == NULL)
2133                         send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2134                 if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0)
2135                         send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2136                 fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n",
2137                                 prequest, /* GET or POST */
2138                                 proxy_entry->url_to, /* url part 1 */
2139                                 urlcopy + strlen(proxy_entry->url_from), /* url part 2 */
2140                                 (g_query ? "?" : ""), /* "?" (maybe) */
2141                                 (g_query ? g_query : ""), /* query string (maybe) */
2142                                 http_major_version, http_minor_version);
2143                 header_ptr[0] = '\r';
2144                 header_ptr[1] = '\n';
2145                 header_ptr += 2;
2146                 write(proxy_fd, header_buf, header_ptr - header_buf);
2147                 free(header_buf); /* on the order of 8k, free it */
2148                 cgi_io_loop_and_exit(proxy_fd, proxy_fd, length);
2149         }
2150 #endif
2151
2152         tptr = urlcopy + 1;      /* skip first '/' */
2153
2154 #if ENABLE_FEATURE_HTTPD_CGI
2155         if (strncmp(tptr, "cgi-bin/", 8) == 0) {
2156                 if (tptr[8] == '\0') {
2157                         /* protect listing "cgi-bin/" */
2158                         send_headers_and_exit(HTTP_FORBIDDEN);
2159                 }
2160                 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2161         }
2162 #endif
2163
2164         if (urlp[-1] == '/')
2165                 strcpy(urlp, index_page);
2166         if (stat(tptr, &sb) == 0) {
2167 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
2168                 char *suffix = strrchr(tptr, '.');
2169                 if (suffix) {
2170                         Htaccess *cur;
2171                         for (cur = script_i; cur; cur = cur->next) {
2172                                 if (strcmp(cur->before_colon + 1, suffix) == 0) {
2173                                         send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2174                                 }
2175                         }
2176                 }
2177 #endif
2178                 file_size = sb.st_size;
2179                 last_mod = sb.st_mtime;
2180         }
2181 #if ENABLE_FEATURE_HTTPD_CGI
2182         else if (urlp[-1] == '/') {
2183                 /* It's a dir URL and there is no index.html
2184                  * Try cgi-bin/index.cgi */
2185                 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
2186                         urlp[0] = '\0';
2187                         g_query = urlcopy;
2188                         send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
2189                 }
2190         }
2191         /* else fall through to send_file, it errors out if open fails: */
2192
2193         if (prequest != request_GET && prequest != request_HEAD) {
2194                 /* POST for files does not make sense */
2195                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2196         }
2197         send_file_and_exit(tptr,
2198                 (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS)
2199         );
2200 #else
2201         send_file_and_exit(tptr, SEND_HEADERS_AND_BODY);
2202 #endif
2203 }
2204
2205 /*
2206  * The main http server function.
2207  * Given a socket, listen for new connections and farm out
2208  * the processing as a [v]forked process.
2209  * Never returns.
2210  */
2211 #if BB_MMU
2212 static void mini_httpd(int server_socket) NORETURN;
2213 static void mini_httpd(int server_socket)
2214 {
2215         /* NB: it's best to not use xfuncs in this loop before fork().
2216          * Otherwise server may die on transient errors (temporary
2217          * out-of-memory condition, etc), which is Bad(tm).
2218          * Try to do any dangerous calls after fork.
2219          */
2220         while (1) {
2221                 int n;
2222                 len_and_sockaddr fromAddr;
2223
2224                 /* Wait for connections... */
2225                 fromAddr.len = LSA_SIZEOF_SA;
2226                 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2227                 if (n < 0)
2228                         continue;
2229
2230                 /* set the KEEPALIVE option to cull dead connections */
2231                 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2232
2233                 if (fork() == 0) {
2234                         /* child */
2235                         /* Do not reload config on HUP */
2236                         signal(SIGHUP, SIG_IGN);
2237                         close(server_socket);
2238                         xmove_fd(n, 0);
2239                         xdup2(0, 1);
2240
2241                         handle_incoming_and_exit(&fromAddr);
2242                 }
2243                 /* parent, or fork failed */
2244                 close(n);
2245         } /* while (1) */
2246         /* never reached */
2247 }
2248 #else
2249 static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN;
2250 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2251 {
2252         char *argv_copy[argc + 2];
2253
2254         argv_copy[0] = argv[0];
2255         argv_copy[1] = (char*)"-i";
2256         memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2257
2258         /* NB: it's best to not use xfuncs in this loop before vfork().
2259          * Otherwise server may die on transient errors (temporary
2260          * out-of-memory condition, etc), which is Bad(tm).
2261          * Try to do any dangerous calls after fork.
2262          */
2263         while (1) {
2264                 int n;
2265                 len_and_sockaddr fromAddr;
2266
2267                 /* Wait for connections... */
2268                 fromAddr.len = LSA_SIZEOF_SA;
2269                 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2270                 if (n < 0)
2271                         continue;
2272
2273                 /* set the KEEPALIVE option to cull dead connections */
2274                 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2275
2276                 if (vfork() == 0) {
2277                         /* child */
2278                         /* Do not reload config on HUP */
2279                         signal(SIGHUP, SIG_IGN);
2280                         close(server_socket);
2281                         xmove_fd(n, 0);
2282                         xdup2(0, 1);
2283
2284                         /* Run a copy of ourself in inetd mode */
2285                         re_exec(argv_copy);
2286                 }
2287                 /* parent, or vfork failed */
2288                 close(n);
2289         } /* while (1) */
2290         /* never reached */
2291 }
2292 #endif
2293
2294 /*
2295  * Process a HTTP connection on stdin/out.
2296  * Never returns.
2297  */
2298 static void mini_httpd_inetd(void) NORETURN;
2299 static void mini_httpd_inetd(void)
2300 {
2301         len_and_sockaddr fromAddr;
2302
2303         memset(&fromAddr, 0, sizeof(fromAddr));
2304         fromAddr.len = LSA_SIZEOF_SA;
2305         /* NB: can fail if user runs it by hand and types in http cmds */
2306         getpeername(0, &fromAddr.u.sa, &fromAddr.len);
2307         handle_incoming_and_exit(&fromAddr);
2308 }
2309
2310 static void sighup_handler(int sig UNUSED_PARAM)
2311 {
2312         parse_conf(DEFAULT_PATH_HTTPD_CONF, SIGNALED_PARSE);
2313 }
2314
2315 enum {
2316         c_opt_config_file = 0,
2317         d_opt_decode_url,
2318         h_opt_home_httpd,
2319         IF_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2320         IF_FEATURE_HTTPD_BASIC_AUTH(    r_opt_realm     ,)
2321         IF_FEATURE_HTTPD_AUTH_MD5(      m_opt_md5       ,)
2322         IF_FEATURE_HTTPD_SETUID(        u_opt_setuid    ,)
2323         p_opt_port      ,
2324         p_opt_inetd     ,
2325         p_opt_foreground,
2326         p_opt_verbose   ,
2327         OPT_CONFIG_FILE = 1 << c_opt_config_file,
2328         OPT_DECODE_URL  = 1 << d_opt_decode_url,
2329         OPT_HOME_HTTPD  = 1 << h_opt_home_httpd,
2330         OPT_ENCODE_URL  = IF_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2331         OPT_REALM       = IF_FEATURE_HTTPD_BASIC_AUTH(    (1 << r_opt_realm     )) + 0,
2332         OPT_MD5         = IF_FEATURE_HTTPD_AUTH_MD5(      (1 << m_opt_md5       )) + 0,
2333         OPT_SETUID      = IF_FEATURE_HTTPD_SETUID(        (1 << u_opt_setuid    )) + 0,
2334         OPT_PORT        = 1 << p_opt_port,
2335         OPT_INETD       = 1 << p_opt_inetd,
2336         OPT_FOREGROUND  = 1 << p_opt_foreground,
2337         OPT_VERBOSE     = 1 << p_opt_verbose,
2338 };
2339
2340
2341 int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2342 int httpd_main(int argc UNUSED_PARAM, char **argv)
2343 {
2344         int server_socket = server_socket; /* for gcc */
2345         unsigned opt;
2346         char *url_for_decode;
2347         IF_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2348         IF_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2349         IF_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2350         IF_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2351
2352         INIT_G();
2353
2354 #if ENABLE_LOCALE_SUPPORT
2355         /* Undo busybox.c: we want to speak English in http (dates etc) */
2356         setlocale(LC_TIME, "C");
2357 #endif
2358
2359         home_httpd = xrealloc_getcwd_or_warn(NULL);
2360         /* -v counts, -i implies -f */
2361         opt_complementary = "vv:if";
2362         /* We do not "absolutize" path given by -h (home) opt.
2363          * If user gives relative path in -h,
2364          * $SCRIPT_FILENAME will not be set. */
2365         opt = getopt32(argv, "c:d:h:"
2366                         IF_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2367                         IF_FEATURE_HTTPD_BASIC_AUTH("r:")
2368                         IF_FEATURE_HTTPD_AUTH_MD5("m:")
2369                         IF_FEATURE_HTTPD_SETUID("u:")
2370                         "p:ifv",
2371                         &opt_c_configFile, &url_for_decode, &home_httpd
2372                         IF_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2373                         IF_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2374                         IF_FEATURE_HTTPD_AUTH_MD5(, &pass)
2375                         IF_FEATURE_HTTPD_SETUID(, &s_ugid)
2376                         , &bind_addr_or_port
2377                         , &verbose
2378                 );
2379         if (opt & OPT_DECODE_URL) {
2380                 fputs(decodeString(url_for_decode, 1), stdout);
2381                 return 0;
2382         }
2383 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2384         if (opt & OPT_ENCODE_URL) {
2385                 fputs(encodeString(url_for_encode), stdout);
2386                 return 0;
2387         }
2388 #endif
2389 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2390         if (opt & OPT_MD5) {
2391                 char salt[sizeof("$1$XXXXXXXX")];
2392                 salt[0] = '$';
2393                 salt[1] = '1';
2394                 salt[2] = '$';
2395                 crypt_make_salt(salt + 3, 4, 0);
2396                 puts(pw_encrypt(pass, salt, 1));
2397                 return 0;
2398         }
2399 #endif
2400 #if ENABLE_FEATURE_HTTPD_SETUID
2401         if (opt & OPT_SETUID) {
2402                 xget_uidgid(&ugid, s_ugid);
2403         }
2404 #endif
2405
2406 #if !BB_MMU
2407         if (!(opt & OPT_FOREGROUND)) {
2408                 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2409         }
2410 #endif
2411
2412         xchdir(home_httpd);
2413         if (!(opt & OPT_INETD)) {
2414                 signal(SIGCHLD, SIG_IGN);
2415                 server_socket = openServer();
2416 #if ENABLE_FEATURE_HTTPD_SETUID
2417                 /* drop privileges */
2418                 if (opt & OPT_SETUID) {
2419                         if (ugid.gid != (gid_t)-1) {
2420                                 if (setgroups(1, &ugid.gid) == -1)
2421                                         bb_perror_msg_and_die("setgroups");
2422                                 xsetgid(ugid.gid);
2423                         }
2424                         xsetuid(ugid.uid);
2425                 }
2426 #endif
2427         }
2428
2429 #if 0
2430         /* User can do it himself: 'env - PATH="$PATH" httpd'
2431          * We don't do it because we don't want to screw users
2432          * which want to do
2433          * 'env - VAR1=val1 VAR2=val2 httpd'
2434          * and have VAR1 and VAR2 values visible in their CGIs.
2435          * Besides, it is also smaller. */
2436         {
2437                 char *p = getenv("PATH");
2438                 /* env strings themself are not freed, no need to xstrdup(p): */
2439                 clearenv();
2440                 if (p)
2441                         putenv(p - 5);
2442 //              if (!(opt & OPT_INETD))
2443 //                      setenv_long("SERVER_PORT", ???);
2444         }
2445 #endif
2446
2447         parse_conf(DEFAULT_PATH_HTTPD_CONF, FIRST_PARSE);
2448         if (!(opt & OPT_INETD))
2449                 signal(SIGHUP, sighup_handler);
2450
2451         xfunc_error_retval = 0;
2452         if (opt & OPT_INETD)
2453                 mini_httpd_inetd();
2454 #if BB_MMU
2455         if (!(opt & OPT_FOREGROUND))
2456                 bb_daemonize(0); /* don't change current directory */
2457         mini_httpd(server_socket); /* never returns */
2458 #else
2459         mini_httpd_nommu(server_socket, argc, argv); /* never returns */
2460 #endif
2461         /* return 0; */
2462 }