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