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 a 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   # running cgi.php scripts 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
  98 #include "libbb.h"
  99 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
 100 # include <sys/sendfile.h>
 101 #endif
 102
 103 //#define DEBUG 1
 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 *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 configFile        (G.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  * The first non-white character is examined to determine if the config line
 456  * is one of the following:
 457  *    .ext:mime/type   # new mime type not compiled into httpd
 458  *    [adAD]:from      # ip address allow/deny, * for wildcard
 459  *    /path:user:pass  # username/password
 460  *    Ennn:error.html  # error page for status nnn
 461  *    P:/url:[http://]hostname[:port]/new/path # reverse proxy
 462  *
 463  * Any previous IP rules are discarded.
 464  * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
 465  * are also discarded.  That is, previous settings are retained if flag is
 466  * SUBDIR_PARSE.
 467  * Error pages are only parsed on the main config file.
 468  *
 469  * path   Path where to look for httpd.conf (without filename).
 470  * flag   Type of the parse request.
 471  */
 472 /* flag */
 473 #define FIRST_PARSE          0
 474 #define SUBDIR_PARSE         1
 475 #define SIGNALED_PARSE       2
 476 #define FIND_FROM_HTTPD_ROOT 3
 477 static void parse_conf(const char *path, int flag)
 478 {
 479         FILE *f;
 480 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 481         Htaccess *prev;
 482 #endif
 483         Htaccess *cur;
 484         const char *filename = configFile;
 485         char buf[160];
 486         char *p, *p0;
 487         char *after_colon;
 488         Htaccess_IP *pip;
 489
 490         /* discard old rules */
 491         free_Htaccess_IP_list(&ip_a_d);
 492         flg_deny_all = 0;
 493         /* retain previous auth and mime config only for subdir parse */
 494         if (flag != SUBDIR_PARSE) {
 495 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 496                 free_Htaccess_list(&g_auth);
 497 #endif
 498                 free_Htaccess_list(&mime_a);
 499 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 500                 free_Htaccess_list(&script_i);
 501 #endif
 502         }
 503
 504         if (flag == SUBDIR_PARSE || filename == NULL) {
 505                 filename = alloca(strlen(path) + sizeof(httpd_conf) + 2);
 506                 sprintf((char *)filename, "%s/%s", path, httpd_conf);
 507         }
 508
 509         while ((f = fopen_for_read(filename)) == NULL) {
 510                 if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
 511                         /* config file not found, no changes to config */
 512                         return;
 513                 }
 514                 if (configFile && flag == FIRST_PARSE) /* if -c option given */
 515                         bb_simple_perror_msg_and_die(filename);
 516                 flag = FIND_FROM_HTTPD_ROOT;
 517                 filename = httpd_conf;
 518         }
 519
 520 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 521         prev = g_auth;
 522 #endif
 523         /* This could stand some work */
 524         while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
 525                 after_colon = NULL;
 526                 for (p = p0; *p0 != '\0' && *p0 != '#'; p0++) {
 527                         if (!isspace(*p0)) {
 528                                 *p++ = *p0;
 529                                 if (*p0 == ':' && after_colon == NULL)
 530                                         after_colon = p;
 531                         }
 532                 }
 533                 *p = '\0';
 534
 535                 /* test for empty or strange line */
 536                 if (after_colon == NULL || *after_colon == '\0')
 537                         continue;
 538                 p0 = buf;
 539                 if (*p0 == 'd' || *p0 == 'a')
 540                         *p0 -= 0x20; /* a/d -> A/D */
 541                 if (*after_colon == '*') {
 542                         if (*p0 == 'D') {
 543                                 /* memorize "deny all" */
 544                                 flg_deny_all = 1;
 545                         }
 546                         /* skip assumed "A:*", it is a default anyway */
 547                         continue;
 548                 }
 549
 550                 if (*p0 == 'A' || *p0 == 'D') {
 551                         /* storing current config IP line */
 552                         pip = xzalloc(sizeof(Htaccess_IP));
 553                         if (scan_ip_mask(after_colon, &(pip->ip), &(pip->mask))) {
 554                                 /* IP{/mask} syntax error detected, protect all */
 555                                 *p0 = 'D';
 556                                 pip->mask = 0;
 557                         }
 558                         pip->allow_deny = *p0;
 559                         if (*p0 == 'D') {
 560                                 /* Deny:from_IP - prepend */
 561                                 pip->next = ip_a_d;
 562                                 ip_a_d = pip;
 563                         } else {
 564                                 /* A:from_IP - append (thus D precedes A) */
 565                                 Htaccess_IP *prev_IP = ip_a_d;
 566                                 if (prev_IP == NULL) {
 567                                         ip_a_d = pip;
 568                                 } else {
 569                                         while (prev_IP->next)
 570                                                 prev_IP = prev_IP->next;
 571                                         prev_IP->next = pip;
 572                                 }
 573                         }
 574                         continue;
 575                 }
 576
 577 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 578                 if (flag == FIRST_PARSE && *p0 == 'E') {
 579                         unsigned i;
 580                         int status = atoi(++p0); /* error status code */
 581                         if (status < HTTP_CONTINUE) {
 582                                 bb_error_msg("config error '%s' in '%s'", buf, filename);
 583                                 continue;
 584                         }
 585                         /* then error page; find matching status */
 586                         for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
 587                                 if (http_response_type[i] == status) {
 588                                         /* We chdir to home_httpd, thus no need to
 589                                          * concat_path_file(home_httpd, after_colon)
 590                                          * here */
 591                                         http_error_page[i] = xstrdup(after_colon);
 592                                         break;
 593                                 }
 594                         }
 595                         continue;
 596                 }
 597 #endif
 598
 599 #if ENABLE_FEATURE_HTTPD_PROXY
 600                 if (flag == FIRST_PARSE && *p0 == 'P') {
 601                         /* P:/url:[http://]hostname[:port]/new/path */
 602                         char *url_from, *host_port, *url_to;
 603                         Htaccess_Proxy *proxy_entry;
 604
 605                         url_from = after_colon;
 606                         host_port = strchr(after_colon, ':');
 607                         if (host_port == NULL) {
 608                                 bb_error_msg("config error '%s' in '%s'", buf, filename);
 609                                 continue;
 610                         }
 611                         *host_port++ = '\0';
 612                         if (strncmp(host_port, "http://", 7) == 0)
 613                                 host_port += 7;
 614                         if (*host_port == '\0') {
 615                                 bb_error_msg("config error '%s' in '%s'", buf, filename);
 616                                 continue;
 617                         }
 618                         url_to = strchr(host_port, '/');
 619                         if (url_to == NULL) {
 620                                 bb_error_msg("config error '%s' in '%s'", buf, filename);
 621                                 continue;
 622                         }
 623                         *url_to = '\0';
 624                         proxy_entry = xzalloc(sizeof(Htaccess_Proxy));
 625                         proxy_entry->url_from = xstrdup(url_from);
 626                         proxy_entry->host_port = xstrdup(host_port);
 627                         *url_to = '/';
 628                         proxy_entry->url_to = xstrdup(url_to);
 629                         proxy_entry->next = proxy;
 630                         proxy = proxy_entry;
 631                         continue;
 632                 }
 633 #endif
 634
 635 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 636                 if (*p0 == '/') {
 637                         /* make full path from httpd root / current_path / config_line_path */
 638                         const char *tp = (flag == SUBDIR_PARSE ? path : "");
 639                         p0 = xmalloc(strlen(tp) + (after_colon - buf) + 2 + strlen(after_colon));
 640                         after_colon[-1] = '\0';
 641                         sprintf(p0, "/%s%s", tp, buf);
 642
 643                         /* looks like bb_simplify_path... */
 644                         tp = p = p0;
 645                         do {
 646                                 if (*p == '/') {
 647                                         if (*tp == '/') {    /* skip duplicate (or initial) slash */
 648                                                 continue;
 649                                         }
 650                                         if (*tp == '.') {
 651                                                 if (tp[1] == '/' || tp[1] == '\0') { /* remove extra '.' */
 652                                                         continue;
 653                                                 }
 654                                                 if ((tp[1] == '.') && (tp[2] == '/' || tp[2] == '\0')) {
 655                                                         ++tp;
 656                                                         if (p > p0) {
 657                                                                 while (*--p != '/') /* omit previous dir */
 658                                                                         continue;
 659                                                         }
 660                                                         continue;
 661                                                 }
 662                                         }
 663                                 }
 664                                 *++p = *tp;
 665                         } while (*++tp);
 666
 667                         if ((p == p0) || (*p != '/')) { /* not a trailing slash */
 668                                 ++p;                    /* so keep last character */
 669                         }
 670                         *p = ':';
 671                         strcpy(p + 1, after_colon);
 672                 }
 673 #endif
 674                 if (*p0 == 'I') {
 675                         index_page = xstrdup(after_colon);
 676                         continue;
 677                 }
 678
 679                 /* Do not allow jumping around using H in subdir's configs */
 680                 if (flag == FIRST_PARSE && *p0 == 'H') {
 681                         home_httpd = xstrdup(after_colon);
 682                         xchdir(home_httpd);
 683                         continue;
 684                 }
 685
 686                 /* storing current config line */
 687                 cur = xzalloc(sizeof(Htaccess) + strlen(p0));
 688                 strcpy(cur->before_colon, p0);
 689 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 690                 if (*p0 == '/') /* was malloced - see above */
 691                         free(p0);
 692 #endif
 693                 cur->after_colon = strchr(cur->before_colon, ':');
 694                 *cur->after_colon++ = '\0';
 695                 if (cur->before_colon[0] == '.') {
 696                         /* .mime line: prepend to mime_a list */
 697                         cur->next = mime_a;
 698                         mime_a = cur;
 699                         continue;
 700                 }
 701 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 702                 if (cur->before_colon[0] == '*' && cur->before_colon[1] == '.') {
 703                         /* script interpreter line: prepend to script_i list */
 704                         cur->next = script_i;
 705                         script_i = cur;
 706                         continue;
 707                 }
 708 #endif
 709 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 710 //TODO: we do not test for leading "/"??
 711 //also, do we leak cur if BASIC_AUTH is off?
 712                 if (prev == NULL) {
 713                         /* first line */
 714                         g_auth = prev = cur;
 715                 } else {
 716                         /* sort path, if current length eq or bigger then move up */
 717                         Htaccess *prev_hti = g_auth;
 718                         size_t l = strlen(cur->before_colon);
 719                         Htaccess *hti;
 720
 721                         for (hti = prev_hti; hti; hti = hti->next) {
 722                                 if (l >= strlen(hti->before_colon)) {
 723                                         /* insert before hti */
 724                                         cur->next = hti;
 725                                         if (prev_hti != hti) {
 726                                                 prev_hti->next = cur;
 727                                         } else {
 728                                                 /* insert as top */
 729                                                 g_auth = cur;
 730                                         }
 731                                         break;
 732                                 }
 733                                 if (prev_hti != hti)
 734                                         prev_hti = prev_hti->next;
 735                         }
 736                         if (!hti) {       /* not inserted, add to bottom */
 737                                 prev->next = cur;
 738                                 prev = cur;
 739                         }
 740                 }
 741 #endif /* BASIC_AUTH */
 742          } /* while (fgets) */
 743          fclose(f);
 744 }
 745
 746 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
 747 /*
 748  * Given a string, html-encode special characters.
 749  * This is used for the -e command line option to provide an easy way
 750  * for scripts to encode result data without confusing browsers.  The
 751  * returned string pointer is memory allocated by malloc().
 752  *
 753  * Returns a pointer to the encoded string (malloced).
 754  */
 755 static char *encodeString(const char *string)
 756 {
 757         /* take the simple route and encode everything */
 758         /* could possibly scan once to get length.     */
 759         int len = strlen(string);
 760         char *out = xmalloc(len * 6 + 1);
 761         char *p = out;
 762         char ch;
 763
 764         while ((ch = *string++)) {
 765                 /* very simple check for what to encode */
 766                 if (isalnum(ch))
 767                         *p++ = ch;
 768                 else
 769                         p += sprintf(p, "&#%d;", (unsigned char) ch);
 770         }
 771         *p = '\0';
 772         return out;
 773 }
 774 #endif          /* FEATURE_HTTPD_ENCODE_URL_STR */
 775
 776 /*
 777  * Given a URL encoded string, convert it to plain ascii.
 778  * Since decoding always makes strings smaller, the decode is done in-place.
 779  * Thus, callers should xstrdup() the argument if they do not want the
 780  * argument modified.  The return is the original pointer, allowing this
 781  * function to be easily used as arguments to other functions.
 782  *
 783  * string    The first string to decode.
 784  * option_d  1 if called for httpd -d
 785  *
 786  * Returns a pointer to the decoded string (same as input).
 787  */
 788 static unsigned hex_to_bin(unsigned char c)
 789 {
 790         unsigned v;
 791
 792         v = c - '0';
 793         if (v <= 9)
 794                 return v;
 795         /* c | 0x20: letters to lower case, non-letters
 796          * to (potentially different) non-letters */
 797         v = (unsigned)(c | 0x20) - 'a';
 798         if (v <= 5)
 799                 return v + 10;
 800         return ~0;
 801 }
 802 /* For testing:
 803 void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
 804 int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
 805 t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
 806 */
 807 static char *decodeString(char *orig, int option_d)
 808 {
 809         /* note that decoded string is always shorter than original */
 810         char *string = orig;
 811         char *ptr = string;
 812         char c;
 813
 814         while ((c = *ptr++) != '\0') {
 815                 unsigned v;
 816
 817                 if (option_d && c == '+') {
 818                         *string++ = ' ';
 819                         continue;
 820                 }
 821                 if (c != '%') {
 822                         *string++ = c;
 823                         continue;
 824                 }
 825                 v = hex_to_bin(ptr[0]);
 826                 if (v > 15) {
 827  bad_hex:
 828                         if (!option_d)
 829                                 return NULL;
 830                         *string++ = '%';
 831                         continue;
 832                 }
 833                 v = (v * 16) | hex_to_bin(ptr[1]);
 834                 if (v > 255)
 835                         goto bad_hex;
 836                 if (!option_d && (v == '/' || v == '\0')) {
 837                         /* caller takes it as indication of invalid
 838                          * (dangerous wrt exploits) chars */
 839                         return orig + 1;
 840                 }
 841                 *string++ = v;
 842                 ptr += 2;
 843         }
 844         *string = '\0';
 845         return orig;
 846 }
 847
 848 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 849 /*
 850  * Decode a base64 data stream as per rfc1521.
 851  * Note that the rfc states that non base64 chars are to be ignored.
 852  * Since the decode always results in a shorter size than the input,
 853  * it is OK to pass the input arg as an output arg.
 854  * Parameter: a pointer to a base64 encoded string.
 855  * Decoded data is stored in-place.
 856  */
 857 static void decodeBase64(char *Data)
 858 {
 859         const unsigned char *in = (const unsigned char *)Data;
 860         /* The decoded size will be at most 3/4 the size of the encoded */
 861         unsigned ch = 0;
 862         int i = 0;
 863
 864         while (*in) {
 865                 int t = *in++;
 866
 867                 if (t >= '0' && t <= '9')
 868                         t = t - '0' + 52;
 869                 else if (t >= 'A' && t <= 'Z')
 870                         t = t - 'A';
 871                 else if (t >= 'a' && t <= 'z')
 872                         t = t - 'a' + 26;
 873                 else if (t == '+')
 874                         t = 62;
 875                 else if (t == '/')
 876                         t = 63;
 877                 else if (t == '=')
 878                         t = 0;
 879                 else
 880                         continue;
 881
 882                 ch = (ch << 6) | t;
 883                 i++;
 884                 if (i == 4) {
 885                         *Data++ = (char) (ch >> 16);
 886                         *Data++ = (char) (ch >> 8);
 887                         *Data++ = (char) ch;
 888                         i = 0;
 889                 }
 890         }
 891         *Data = '\0';
 892 }
 893 #endif
 894
 895 /*
 896  * Create a listen server socket on the designated port.
 897  */
 898 static int openServer(void)
 899 {
 900         unsigned n = bb_strtou(bind_addr_or_port, NULL, 10);
 901         if (!errno && n && n <= 0xffff)
 902                 n = create_and_bind_stream_or_die(NULL, n);
 903         else
 904                 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
 905         xlisten(n, 9);
 906         return n;
 907 }
 908
 909 /*
 910  * Log the connection closure and exit.
 911  */
 912 static void log_and_exit(void) NORETURN;
 913 static void log_and_exit(void)
 914 {
 915         /* Paranoia. IE said to be buggy. It may send some extra data
 916          * or be confused by us just exiting without SHUT_WR. Oh well. */
 917         shutdown(1, SHUT_WR);
 918         /* Why??
 919         (this also messes up stdin when user runs httpd -i from terminal)
 920         ndelay_on(0);
 921         while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0)
 922                 continue;
 923         */
 924
 925         if (verbose > 2)
 926                 bb_error_msg("closed");
 927         _exit(xfunc_error_retval);
 928 }
 929
 930 /*
 931  * Create and send HTTP response headers.
 932  * The arguments are combined and sent as one write operation.  Note that
 933  * IE will puke big-time if the headers are not sent in one packet and the
 934  * second packet is delayed for any reason.
 935  * responseNum - the result code to send.
 936  */
 937 static void send_headers(int responseNum)
 938 {
 939         static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
 940
 941         const char *responseString = "";
 942         const char *infoString = NULL;
 943         const char *mime_type;
 944 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 945         const char *error_page = NULL;
 946 #endif
 947         unsigned i;
 948         time_t timer = time(NULL);
 949         char tmp_str[80];
 950         int len;
 951
 952         for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
 953                 if (http_response_type[i] == responseNum) {
 954                         responseString = http_response[i].name;
 955                         infoString = http_response[i].info;
 956 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 957                         error_page = http_error_page[i];
 958 #endif
 959                         break;
 960                 }
 961         }
 962         /* error message is HTML */
 963         mime_type = responseNum == HTTP_OK ?
 964                                 found_mime_type : "text/html";
 965
 966         if (verbose)
 967                 bb_error_msg("response:%u", responseNum);
 968
 969         /* emit the current date */
 970         strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
 971         len = sprintf(iobuf,
 972                         "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
 973                         "Date: %s\r\nConnection: close\r\n",
 974                         responseNum, responseString, mime_type, tmp_str);
 975
 976 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 977         if (responseNum == HTTP_UNAUTHORIZED) {
 978                 len += sprintf(iobuf + len,
 979                                 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
 980                                 g_realm);
 981         }
 982 #endif
 983         if (responseNum == HTTP_MOVED_TEMPORARILY) {
 984                 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
 985                                 found_moved_temporarily,
 986                                 (g_query ? "?" : ""),
 987                                 (g_query ? g_query : ""));
 988         }
 989
 990 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 991         if (error_page && access(error_page, R_OK) == 0) {
 992                 strcat(iobuf, "\r\n");
 993                 len += 2;
 994
 995                 if (DEBUG)
 996                         fprintf(stderr, "headers: '%s'\n", iobuf);
 997                 full_write(STDOUT_FILENO, iobuf, len);
 998                 if (DEBUG)
 999                         fprintf(stderr, "writing error page: '%s'\n", error_page);
1000                 return send_file_and_exit(error_page, SEND_BODY);
1001         }
1002 #endif
1003
1004         if (file_size != -1) {    /* file */
1005                 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
1006 #if ENABLE_FEATURE_HTTPD_RANGES
1007                 if (responseNum == HTTP_PARTIAL_CONTENT) {
1008                         len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n",
1009                                         range_start,
1010                                         range_end,
1011                                         file_size);
1012                         file_size = range_end - range_start + 1;
1013                 }
1014 #endif
1015                 len += sprintf(iobuf + len,
1016 #if ENABLE_FEATURE_HTTPD_RANGES
1017                         "Accept-Ranges: bytes\r\n"
1018 #endif
1019                         "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
1020                                 tmp_str,
1021                                 "Content-length:",
1022                                 file_size
1023                 );
1024         }
1025         iobuf[len++] = '\r';
1026         iobuf[len++] = '\n';
1027         if (infoString) {
1028                 len += sprintf(iobuf + len,
1029                                 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
1030                                 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
1031                                 responseNum, responseString,
1032                                 responseNum, responseString, infoString);
1033         }
1034         if (DEBUG)
1035                 fprintf(stderr, "headers: '%s'\n", iobuf);
1036         if (full_write(STDOUT_FILENO, iobuf, len) != len) {
1037                 if (verbose > 1)
1038                         bb_perror_msg("error");
1039                 log_and_exit();
1040         }
1041 }
1042
1043 static void send_headers_and_exit(int responseNum) NORETURN;
1044 static void send_headers_and_exit(int responseNum)
1045 {
1046         send_headers(responseNum);
1047         log_and_exit();
1048 }
1049
1050 /*
1051  * Read from the socket until '\n' or EOF. '\r' chars are removed.
1052  * '\n' is replaced with NUL.
1053  * Return number of characters read or 0 if nothing is read
1054  * ('\r' and '\n' are not counted).
1055  * Data is returned in iobuf.
1056  */
1057 static int get_line(void)
1058 {
1059         int count = 0;
1060         char c;
1061
1062         alarm(HEADER_READ_TIMEOUT);
1063         while (1) {
1064                 if (hdr_cnt <= 0) {
1065                         hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1066                         if (hdr_cnt <= 0)
1067                                 break;
1068                         hdr_ptr = hdr_buf;
1069                 }
1070                 iobuf[count] = c = *hdr_ptr++;
1071                 hdr_cnt--;
1072
1073                 if (c == '\r')
1074                         continue;
1075                 if (c == '\n') {
1076                         iobuf[count] = '\0';
1077                         break;
1078                 }
1079                 if (count < (IOBUF_SIZE - 1))      /* check overflow */
1080                         count++;
1081         }
1082         return count;
1083 }
1084
1085 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1086
1087 /* gcc 4.2.1 fares better with NOINLINE */
1088 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN;
1089 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1090 {
1091         enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1092         struct pollfd pfd[3];
1093         int out_cnt; /* we buffer a bit of initial CGI output */
1094         int count;
1095
1096         /* iobuf is used for CGI -> network data,
1097          * hdr_buf is for network -> CGI data (POSTDATA) */
1098
1099         /* If CGI dies, we still want to correctly finish reading its output
1100          * and send it to the peer. So please no SIGPIPEs! */
1101         signal(SIGPIPE, SIG_IGN);
1102
1103         // We inconsistently handle a case when more POSTDATA from network
1104         // is coming than we expected. We may give *some part* of that
1105         // extra data to CGI.
1106
1107         //if (hdr_cnt > post_len) {
1108         //      /* We got more POSTDATA from network than we expected */
1109         //      hdr_cnt = post_len;
1110         //}
1111         post_len -= hdr_cnt;
1112         /* post_len - number of POST bytes not yet read from network */
1113
1114         /* NB: breaking out of this loop jumps to log_and_exit() */
1115         out_cnt = 0;
1116         while (1) {
1117                 memset(pfd, 0, sizeof(pfd));
1118
1119                 pfd[FROM_CGI].fd = fromCgi_rd;
1120                 pfd[FROM_CGI].events = POLLIN;
1121
1122                 if (toCgi_wr) {
1123                         pfd[TO_CGI].fd = toCgi_wr;
1124                         if (hdr_cnt > 0) {
1125                                 pfd[TO_CGI].events = POLLOUT;
1126                         } else if (post_len > 0) {
1127                                 pfd[0].events = POLLIN;
1128                         } else {
1129                                 /* post_len <= 0 && hdr_cnt <= 0:
1130                                  * no more POST data to CGI,
1131                                  * let CGI see EOF on CGI's stdin */
1132                                 close(toCgi_wr);
1133                                 toCgi_wr = 0;
1134                         }
1135                 }
1136
1137                 /* Now wait on the set of sockets */
1138                 count = safe_poll(pfd, 3, -1);
1139                 if (count <= 0) {
1140 #if 0
1141                         if (safe_waitpid(pid, &status, WNOHANG) <= 0) {
1142                                 /* Weird. CGI didn't exit and no fd's
1143                                  * are ready, yet poll returned?! */
1144                                 continue;
1145                         }
1146                         if (DEBUG && WIFEXITED(status))
1147                                 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1148                         if (DEBUG && WIFSIGNALED(status))
1149                                 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1150 #endif
1151                         break;
1152                 }
1153
1154                 if (pfd[TO_CGI].revents) {
1155                         /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */
1156                         /* Have data from peer and can write to CGI */
1157                         count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1158                         /* Doesn't happen, we dont use nonblocking IO here
1159                          *if (count < 0 && errno == EAGAIN) {
1160                          *      ...
1161                          *} else */
1162                         if (count > 0) {
1163                                 hdr_ptr += count;
1164                                 hdr_cnt -= count;
1165                         } else {
1166                                 /* EOF/broken pipe to CGI, stop piping POST data */
1167                                 hdr_cnt = post_len = 0;
1168                         }
1169                 }
1170
1171                 if (pfd[0].revents) {
1172                         /* post_len > 0 && hdr_cnt == 0 here */
1173                         /* We expect data, prev data portion is eaten by CGI
1174                          * and there *is* data to read from the peer
1175                          * (POSTDATA) */
1176                         //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
1177                         //count = safe_read(STDIN_FILENO, hdr_buf, count);
1178                         count = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1179                         if (count > 0) {
1180                                 hdr_cnt = count;
1181                                 hdr_ptr = hdr_buf;
1182                                 post_len -= count;
1183                         } else {
1184                                 /* no more POST data can be read */
1185                                 post_len = 0;
1186                         }
1187                 }
1188
1189                 if (pfd[FROM_CGI].revents) {
1190                         /* There is something to read from CGI */
1191                         char *rbuf = iobuf;
1192
1193                         /* Are we still buffering CGI output? */
1194                         if (out_cnt >= 0) {
1195                                 /* HTTP_200[] has single "\r\n" at the end.
1196                                  * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1197                                  * CGI scripts MUST send their own header terminated by
1198                                  * empty line, then data. That's why we have only one
1199                                  * <cr><lf> pair here. We will output "200 OK" line
1200                                  * if needed, but CGI still has to provide blank line
1201                                  * between header and body */
1202
1203                                 /* Must use safe_read, not full_read, because
1204                                  * CGI may output a few first bytes and then wait
1205                                  * for POSTDATA without closing stdout.
1206                                  * With full_read we may wait here forever. */
1207                                 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1208                                 if (count <= 0) {
1209                                         /* eof (or error) and there was no "HTTP",
1210                                          * so write it, then write received data */
1211                                         if (out_cnt) {
1212                                                 full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1);
1213                                                 full_write(STDOUT_FILENO, rbuf, out_cnt);
1214                                         }
1215                                         break; /* CGI stdout is closed, exiting */
1216                                 }
1217                                 out_cnt += count;
1218                                 count = 0;
1219                                 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1220                                 if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1221                                         /* send "HTTP/1.0 " */
1222                                         if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9)
1223                                                 break;
1224                                         rbuf += 8; /* skip "Status: " */
1225                                         count = out_cnt - 8;
1226                                         out_cnt = -1; /* buffering off */
1227                                 } else if (out_cnt >= 4) {
1228                                         /* Did CGI add "HTTP"? */
1229                                         if (memcmp(rbuf, HTTP_200, 4) != 0) {
1230                                                 /* there is no "HTTP", do it ourself */
1231                                                 if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1232                                                         break;
1233                                         }
1234                                         /* Commented out:
1235                                         if (!strstr(rbuf, "ontent-")) {
1236                                                 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1237                                         }
1238                                          * Counter-example of valid CGI without Content-type:
1239                                          * echo -en "HTTP/1.0 302 Found\r\n"
1240                                          * echo -en "Location: http://www.busybox.net\r\n"
1241                                          * echo -en "\r\n"
1242                                          */
1243                                         count = out_cnt;
1244                                         out_cnt = -1; /* buffering off */
1245                                 }
1246                         } else {
1247                                 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1248                                 if (count <= 0)
1249                                         break;  /* eof (or error) */
1250                         }
1251                         if (full_write(STDOUT_FILENO, rbuf, count) != count)
1252                                 break;
1253                         if (DEBUG)
1254                                 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1255                 } /* if (pfd[FROM_CGI].revents) */
1256         } /* while (1) */
1257         log_and_exit();
1258 }
1259 #endif
1260
1261 #if ENABLE_FEATURE_HTTPD_CGI
1262
1263 static void setenv1(const char *name, const char *value)
1264 {
1265         setenv(name, value ? value : "", 1);
1266 }
1267
1268 /*
1269  * Spawn CGI script, forward CGI's stdin/out <=> network
1270  *
1271  * Environment variables are set up and the script is invoked with pipes
1272  * for stdin/stdout.  If a POST is being done the script is fed the POST
1273  * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1274  *
1275  * Parameters:
1276  * const char *url              The requested URL (with leading /).
1277  * int post_len                 Length of the POST body.
1278  * const char *cookie           For set HTTP_COOKIE.
1279  * const char *content_type     For set CONTENT_TYPE.
1280  */
1281 static void send_cgi_and_exit(
1282                 const char *url,
1283                 const char *request,
1284                 int post_len,
1285                 const char *cookie,
1286                 const char *content_type) NORETURN;
1287 static void send_cgi_and_exit(
1288                 const char *url,
1289                 const char *request,
1290                 int post_len,
1291                 const char *cookie,
1292                 const char *content_type)
1293 {
1294         struct fd_pair fromCgi;  /* CGI -> httpd pipe */
1295         struct fd_pair toCgi;    /* httpd -> CGI pipe */
1296         char *script;
1297         int pid;
1298
1299         /* Make a copy. NB: caller guarantees:
1300          * url[0] == '/', url[1] != '/' */
1301         url = xstrdup(url);
1302
1303         /*
1304          * We are mucking with environment _first_ and then vfork/exec,
1305          * this allows us to use vfork safely. Parent doesn't care about
1306          * these environment changes anyway.
1307          */
1308
1309         /* Check for [dirs/]script.cgi/PATH_INFO */
1310         script = (char*)url;
1311         while ((script = strchr(script + 1, '/')) != NULL) {
1312                 struct stat sb;
1313
1314                 *script = '\0';
1315                 if (!is_directory(url + 1, 1, &sb)) {
1316                         /* not directory, found script.cgi/PATH_INFO */
1317                         *script = '/';
1318                         break;
1319                 }
1320                 *script = '/'; /* is directory, find next '/' */
1321         }
1322         setenv1("PATH_INFO", script);   /* set to /PATH_INFO or "" */
1323         setenv1("REQUEST_METHOD", request);
1324         if (g_query) {
1325                 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", url, g_query));
1326         } else {
1327                 setenv1("REQUEST_URI", url);
1328         }
1329         if (script != NULL)
1330                 *script = '\0';         /* cut off /PATH_INFO */
1331
1332         /* SCRIPT_FILENAME is required by PHP in CGI mode */
1333         if (home_httpd[0] == '/') {
1334                 char *fullpath = concat_path_file(home_httpd, url);
1335                 setenv1("SCRIPT_FILENAME", fullpath);
1336         }
1337         /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1338         setenv1("SCRIPT_NAME", url);
1339         /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1340          * QUERY_STRING: The information which follows the ? in the URL
1341          * which referenced this script. This is the query information.
1342          * It should not be decoded in any fashion. This variable
1343          * should always be set when there is query information,
1344          * regardless of command line decoding. */
1345         /* (Older versions of bbox seem to do some decoding) */
1346         setenv1("QUERY_STRING", g_query);
1347         putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1348         putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1349         putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1350         /* Having _separate_ variables for IP and port defeats
1351          * the purpose of having socket abstraction. Which "port"
1352          * are you using on Unix domain socket?
1353          * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1354          * Oh well... */
1355         {
1356                 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1357                 char *cp = strrchr(p, ':');
1358                 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1359                         cp = NULL;
1360                 if (cp) *cp = '\0'; /* delete :PORT */
1361                 setenv1("REMOTE_ADDR", p);
1362                 if (cp) {
1363                         *cp = ':';
1364 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1365                         setenv1("REMOTE_PORT", cp + 1);
1366 #endif
1367                 }
1368         }
1369         setenv1("HTTP_USER_AGENT", user_agent);
1370         if (http_accept)
1371                 setenv1("HTTP_ACCEPT", http_accept);
1372         if (http_accept_language)
1373                 setenv1("HTTP_ACCEPT_LANGUAGE", http_accept_language);
1374         if (post_len)
1375                 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1376         if (cookie)
1377                 setenv1("HTTP_COOKIE", cookie);
1378         if (content_type)
1379                 setenv1("CONTENT_TYPE", content_type);
1380 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1381         if (remoteuser) {
1382                 setenv1("REMOTE_USER", remoteuser);
1383                 putenv((char*)"AUTH_TYPE=Basic");
1384         }
1385 #endif
1386         if (referer)
1387                 setenv1("HTTP_REFERER", referer);
1388         setenv1("HTTP_HOST", host); /* set to "" if NULL */
1389         /* setenv1("SERVER_NAME", safe_gethostname()); - don't do this,
1390          * just run "env SERVER_NAME=xyz httpd ..." instead */
1391
1392         xpiped_pair(fromCgi);
1393         xpiped_pair(toCgi);
1394
1395         pid = vfork();
1396         if (pid < 0) {
1397                 /* TODO: log perror? */
1398                 log_and_exit();
1399         }
1400
1401         if (!pid) {
1402                 /* Child process */
1403                 char *argv[3];
1404
1405                 xfunc_error_retval = 242;
1406
1407                 /* NB: close _first_, then move fds! */
1408                 close(toCgi.wr);
1409                 close(fromCgi.rd);
1410                 xmove_fd(toCgi.rd, 0);  /* replace stdin with the pipe */
1411                 xmove_fd(fromCgi.wr, 1);  /* replace stdout with the pipe */
1412                 /* User seeing stderr output can be a security problem.
1413                  * If CGI really wants that, it can always do dup itself. */
1414                 /* dup2(1, 2); */
1415
1416                 /* Chdiring to script's dir */
1417                 script = strrchr(url, '/');
1418                 if (script != url) { /* paranoia */
1419                         *script = '\0';
1420                         if (chdir(url + 1) != 0) {
1421                                 bb_perror_msg("chdir %s", url + 1);
1422                                 goto error_execing_cgi;
1423                         }
1424                         // not needed: *script = '/';
1425                 }
1426                 script++;
1427
1428                 /* set argv[0] to name without path */
1429                 argv[0] = script;
1430                 argv[1] = NULL;
1431
1432 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1433                 {
1434                         char *suffix = strrchr(script, '.');
1435
1436                         if (suffix) {
1437                                 Htaccess *cur;
1438                                 for (cur = script_i; cur; cur = cur->next) {
1439                                         if (strcmp(cur->before_colon + 1, suffix) == 0) {
1440                                                 /* found interpreter name */
1441                                                 argv[0] = cur->after_colon;
1442                                                 argv[1] = script;
1443                                                 argv[2] = NULL;
1444                                                 break;
1445                                         }
1446                                 }
1447                         }
1448                 }
1449 #endif
1450                 /* restore default signal dispositions for CGI process */
1451                 bb_signals(0
1452                         | (1 << SIGCHLD)
1453                         | (1 << SIGPIPE)
1454                         | (1 << SIGHUP)
1455                         , SIG_DFL);
1456
1457                 /* _NOT_ execvp. We do not search PATH. argv[0] is a filename
1458                  * without any dir components and will only match a file
1459                  * in the current directory */
1460                 execv(argv[0], argv);
1461                 if (verbose)
1462                         bb_perror_msg("exec %s", argv[0]);
1463  error_execing_cgi:
1464                 /* send to stdout
1465                  * (we are CGI here, our stdout is pumped to the net) */
1466                 send_headers_and_exit(HTTP_NOT_FOUND);
1467         } /* end child */
1468
1469         /* Parent process */
1470
1471         /* Restore variables possibly changed by child */
1472         xfunc_error_retval = 0;
1473
1474         /* Pump data */
1475         close(fromCgi.wr);
1476         close(toCgi.rd);
1477         cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1478 }
1479
1480 #endif          /* FEATURE_HTTPD_CGI */
1481
1482 /*
1483  * Send a file response to a HTTP request, and exit
1484  *
1485  * Parameters:
1486  * const char *url  The requested URL (with leading /).
1487  * what             What to send (headers/body/both).
1488  */
1489 static NOINLINE void send_file_and_exit(const char *url, int what)
1490 {
1491         static const char *const suffixTable[] = {
1492         /* Warning: shorter equivalent suffix in one line must be first */
1493                 ".htm.html", "text/html",
1494                 ".jpg.jpeg", "image/jpeg",
1495                 ".gif",      "image/gif",
1496                 ".png",      "image/png",
1497                 ".txt.h.c.cc.cpp", "text/plain",
1498                 ".css",      "text/css",
1499                 ".wav",      "audio/wav",
1500                 ".avi",      "video/x-msvideo",
1501                 ".qt.mov",   "video/quicktime",
1502                 ".mpe.mpeg", "video/mpeg",
1503                 ".mid.midi", "audio/midi",
1504                 ".mp3",      "audio/mpeg",
1505 #if 0                        /* unpopular */
1506                 ".au",       "audio/basic",
1507                 ".pac",      "application/x-ns-proxy-autoconfig",
1508                 ".vrml.wrl", "model/vrml",
1509 #endif
1510                 NULL
1511         };
1512
1513         char *suffix;
1514         int fd;
1515         const char *const *table;
1516         const char *try_suffix;
1517         ssize_t count;
1518
1519         fd = open(url, O_RDONLY);
1520         if (fd < 0) {
1521                 if (DEBUG)
1522                         bb_perror_msg("can't open '%s'", url);
1523                 /* Error pages are sent by using send_file_and_exit(SEND_BODY).
1524                  * IOW: it is unsafe to call send_headers_and_exit
1525                  * if what is SEND_BODY! Can recurse! */
1526                 if (what != SEND_BODY)
1527                         send_headers_and_exit(HTTP_NOT_FOUND);
1528                 log_and_exit();
1529         }
1530
1531         if (DEBUG)
1532                 bb_error_msg("sending file '%s' content-type: %s",
1533                         url, found_mime_type);
1534
1535         /* If you want to know about EPIPE below
1536          * (happens if you abort downloads from local httpd): */
1537         signal(SIGPIPE, SIG_IGN);
1538
1539         suffix = strrchr(url, '.');
1540
1541         /* If not found, set default as "application/octet-stream";  */
1542         found_mime_type = "application/octet-stream";
1543         if (suffix) {
1544                 Htaccess *cur;
1545                 for (table = suffixTable; *table; table += 2) {
1546                         try_suffix = strstr(table[0], suffix);
1547                         if (try_suffix) {
1548                                 try_suffix += strlen(suffix);
1549                                 if (*try_suffix == '\0' || *try_suffix == '.') {
1550                                         found_mime_type = table[1];
1551                                         break;
1552                                 }
1553                         }
1554                 }
1555                 for (cur = mime_a; cur; cur = cur->next) {
1556                         if (strcmp(cur->before_colon, suffix) == 0) {
1557                                 found_mime_type = cur->after_colon;
1558                                 break;
1559                         }
1560                 }
1561         }
1562 #if ENABLE_FEATURE_HTTPD_RANGES
1563         if (what == SEND_BODY)
1564                 range_start = 0; /* err pages and ranges don't mix */
1565         range_len = MAXINT(off_t);
1566         if (range_start) {
1567                 if (!range_end) {
1568                         range_end = file_size - 1;
1569                 }
1570                 if (range_end < range_start
1571                  || lseek(fd, range_start, SEEK_SET) != range_start
1572                 ) {
1573                         lseek(fd, 0, SEEK_SET);
1574                         range_start = 0;
1575                 } else {
1576                         range_len = range_end - range_start + 1;
1577                         send_headers(HTTP_PARTIAL_CONTENT);
1578                         what = SEND_BODY;
1579                 }
1580         }
1581 #endif
1582         if (what & SEND_HEADERS)
1583                 send_headers(HTTP_OK);
1584 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1585         {
1586                 off_t offset = range_start;
1587                 while (1) {
1588                         /* sz is rounded down to 64k */
1589                         ssize_t sz = MAXINT(ssize_t) - 0xffff;
1590                         IF_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1591                         count = sendfile(STDOUT_FILENO, fd, &offset, sz);
1592                         if (count < 0) {
1593                                 if (offset == range_start)
1594                                         break; /* fall back to read/write loop */
1595                                 goto fin;
1596                         }
1597                         IF_FEATURE_HTTPD_RANGES(range_len -= sz;)
1598                         if (count == 0 || range_len == 0)
1599                                 log_and_exit();
1600                 }
1601         }
1602 #endif
1603         while ((count = safe_read(fd, iobuf, IOBUF_SIZE)) > 0) {
1604                 ssize_t n;
1605                 IF_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1606                 n = full_write(STDOUT_FILENO, iobuf, count);
1607                 if (count != n)
1608                         break;
1609                 IF_FEATURE_HTTPD_RANGES(range_len -= count;)
1610                 if (range_len == 0)
1611                         break;
1612         }
1613         if (count < 0) {
1614  IF_FEATURE_HTTPD_USE_SENDFILE(fin:)
1615                 if (verbose > 1)
1616                         bb_perror_msg("error");
1617         }
1618         log_and_exit();
1619 }
1620
1621 static int checkPermIP(void)
1622 {
1623         Htaccess_IP *cur;
1624
1625         for (cur = ip_a_d; cur; cur = cur->next) {
1626 #if DEBUG
1627                 fprintf(stderr,
1628                         "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1629                         rmt_ip_str,
1630                         (unsigned char)(cur->ip >> 24),
1631                         (unsigned char)(cur->ip >> 16),
1632                         (unsigned char)(cur->ip >> 8),
1633                         (unsigned char)(cur->ip),
1634                         (unsigned char)(cur->mask >> 24),
1635                         (unsigned char)(cur->mask >> 16),
1636                         (unsigned char)(cur->mask >> 8),
1637                         (unsigned char)(cur->mask)
1638                 );
1639 #endif
1640                 if ((rmt_ip & cur->mask) == cur->ip)
1641                         return (cur->allow_deny == 'A'); /* A -> 1 */
1642         }
1643
1644         return !flg_deny_all; /* depends on whether we saw "D:*" */
1645 }
1646
1647 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1648 /*
1649  * Config file entries are of the form "/<path>:<user>:<passwd>".
1650  * If config file has no prefix match for path, access is allowed.
1651  *
1652  * path                 The file path
1653  * user_and_passwd      "user:passwd" to validate
1654  *
1655  * Returns 1 if user_and_passwd is OK.
1656  */
1657 static int check_user_passwd(const char *path, const char *user_and_passwd)
1658 {
1659         Htaccess *cur;
1660         const char *prev = NULL;
1661
1662         for (cur = g_auth; cur; cur = cur->next) {
1663                 const char *dir_prefix;
1664                 size_t len;
1665
1666                 dir_prefix = cur->before_colon;
1667
1668                 /* WHY? */
1669                 /* If already saw a match, don't accept other different matches */
1670                 if (prev && strcmp(prev, dir_prefix) != 0)
1671                         continue;
1672
1673                 if (DEBUG)
1674                         fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd);
1675
1676                 /* If it's not a prefix match, continue searching */
1677                 len = strlen(dir_prefix);
1678                 if (len != 1 /* dir_prefix "/" matches all, don't need to check */
1679                  && (strncmp(dir_prefix, path, len) != 0
1680                     || (path[len] != '/' && path[len] != '\0'))
1681                 ) {
1682                         continue;
1683                 }
1684
1685                 /* Path match found */
1686                 prev = dir_prefix;
1687
1688                 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1689                         char *md5_passwd;
1690
1691                         md5_passwd = strchr(cur->after_colon, ':');
1692                         if (md5_passwd && md5_passwd[1] == '$' && md5_passwd[2] == '1'
1693                          && md5_passwd[3] == '$' && md5_passwd[4]
1694                         ) {
1695                                 char *encrypted;
1696                                 int r, user_len_p1;
1697
1698                                 md5_passwd++;
1699                                 user_len_p1 = md5_passwd - cur->after_colon;
1700                                 /* comparing "user:" */
1701                                 if (strncmp(cur->after_colon, user_and_passwd, user_len_p1) != 0) {
1702                                         continue;
1703                                 }
1704
1705                                 encrypted = pw_encrypt(
1706                                         user_and_passwd + user_len_p1 /* cleartext pwd from user */,
1707                                         md5_passwd /*salt */, 1 /* cleanup */);
1708                                 r = strcmp(encrypted, md5_passwd);
1709                                 free(encrypted);
1710                                 if (r == 0)
1711                                         goto set_remoteuser_var; /* Ok */
1712                                 continue;
1713                         }
1714                 }
1715
1716                 /* Comparing plaintext "user:pass" in one go */
1717                 if (strcmp(cur->after_colon, user_and_passwd) == 0) {
1718  set_remoteuser_var:
1719                         remoteuser = xstrndup(user_and_passwd,
1720                                         strchrnul(user_and_passwd, ':') - user_and_passwd);
1721                         return 1; /* Ok */
1722                 }
1723         } /* for */
1724
1725         /* 0(bad) if prev is set: matches were found but passwd was wrong */
1726         return (prev == NULL);
1727 }
1728 #endif  /* FEATURE_HTTPD_BASIC_AUTH */
1729
1730 #if ENABLE_FEATURE_HTTPD_PROXY
1731 static Htaccess_Proxy *find_proxy_entry(const char *url)
1732 {
1733         Htaccess_Proxy *p;
1734         for (p = proxy; p; p = p->next) {
1735                 if (strncmp(url, p->url_from, strlen(p->url_from)) == 0)
1736                         return p;
1737         }
1738         return NULL;
1739 }
1740 #endif
1741
1742 /*
1743  * Handle timeouts
1744  */
1745 static void send_REQUEST_TIMEOUT_and_exit(int sig) NORETURN;
1746 static void send_REQUEST_TIMEOUT_and_exit(int sig UNUSED_PARAM)
1747 {
1748         send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1749 }
1750
1751 /*
1752  * Handle an incoming http request and exit.
1753  */
1754 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN;
1755 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1756 {
1757         static const char request_GET[] ALIGN1 = "GET";
1758         struct stat sb;
1759         char *urlcopy;
1760         char *urlp;
1761         char *tptr;
1762 #if ENABLE_FEATURE_HTTPD_CGI
1763         static const char request_HEAD[] ALIGN1 = "HEAD";
1764         const char *prequest;
1765         char *cookie = NULL;
1766         char *content_type = NULL;
1767         unsigned long length = 0;
1768 #elif ENABLE_FEATURE_HTTPD_PROXY
1769 #define prequest request_GET
1770         unsigned long length = 0;
1771 #endif
1772 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1773         smallint authorized = -1;
1774 #endif
1775         smallint ip_allowed;
1776         char http_major_version;
1777 #if ENABLE_FEATURE_HTTPD_PROXY
1778         char http_minor_version;
1779         char *header_buf = header_buf; /* for gcc */
1780         char *header_ptr = header_ptr;
1781         Htaccess_Proxy *proxy_entry;
1782 #endif
1783
1784         /* Allocation of iobuf is postponed until now
1785          * (IOW, server process doesn't need to waste 8k) */
1786         iobuf = xmalloc(IOBUF_SIZE);
1787
1788         rmt_ip = 0;
1789         if (fromAddr->u.sa.sa_family == AF_INET) {
1790                 rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr);
1791         }
1792 #if ENABLE_FEATURE_IPV6
1793         if (fromAddr->u.sa.sa_family == AF_INET6
1794          && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0
1795          && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0
1796          && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1797                 rmt_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]);
1798 #endif
1799         if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1800                 /* NB: can be NULL (user runs httpd -i by hand?) */
1801                 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa);
1802         }
1803         if (verbose) {
1804                 /* this trick makes -v logging much simpler */
1805                 if (rmt_ip_str)
1806                         applet_name = rmt_ip_str;
1807                 if (verbose > 2)
1808                         bb_error_msg("connected");
1809         }
1810
1811         /* Install timeout handler. get_line() needs it. */
1812         signal(SIGALRM, send_REQUEST_TIMEOUT_and_exit);
1813
1814         if (!get_line()) /* EOF or error or empty line */
1815                 send_headers_and_exit(HTTP_BAD_REQUEST);
1816
1817         /* Determine type of request (GET/POST) */
1818         urlp = strpbrk(iobuf, " \t");
1819         if (urlp == NULL)
1820                 send_headers_and_exit(HTTP_BAD_REQUEST);
1821         *urlp++ = '\0';
1822 #if ENABLE_FEATURE_HTTPD_CGI
1823         prequest = request_GET;
1824         if (strcasecmp(iobuf, prequest) != 0) {
1825                 prequest = request_HEAD;
1826                 if (strcasecmp(iobuf, prequest) != 0) {
1827                         prequest = "POST";
1828                         if (strcasecmp(iobuf, prequest) != 0)
1829                                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1830                 }
1831         }
1832 #else
1833         if (strcasecmp(iobuf, request_GET) != 0)
1834                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1835 #endif
1836         urlp = skip_whitespace(urlp);
1837         if (urlp[0] != '/')
1838                 send_headers_and_exit(HTTP_BAD_REQUEST);
1839
1840         /* Find end of URL and parse HTTP version, if any */
1841         http_major_version = '0';
1842         IF_FEATURE_HTTPD_PROXY(http_minor_version = '0';)
1843         tptr = strchrnul(urlp, ' ');
1844         /* Is it " HTTP/"? */
1845         if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) {
1846                 http_major_version = tptr[6];
1847                 IF_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];)
1848         }
1849         *tptr = '\0';
1850
1851         /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
1852         urlcopy = alloca((tptr - urlp) + 2 + strlen(index_page));
1853         /*if (urlcopy == NULL)
1854          *      send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
1855         strcpy(urlcopy, urlp);
1856         /* NB: urlcopy ptr is never changed after this */
1857
1858         /* Extract url args if present */
1859         g_query = NULL;
1860         tptr = strchr(urlcopy, '?');
1861         if (tptr) {
1862                 *tptr++ = '\0';
1863                 g_query = tptr;
1864         }
1865
1866         /* Decode URL escape sequences */
1867         tptr = decodeString(urlcopy, 0);
1868         if (tptr == NULL)
1869                 send_headers_and_exit(HTTP_BAD_REQUEST);
1870         if (tptr == urlcopy + 1) {
1871                 /* '/' or NUL is encoded */
1872                 send_headers_and_exit(HTTP_NOT_FOUND);
1873         }
1874
1875         /* Canonicalize path */
1876         /* Algorithm stolen from libbb bb_simplify_path(),
1877          * but don't strdup, retain trailing slash, protect root */
1878         urlp = tptr = urlcopy;
1879         do {
1880                 if (*urlp == '/') {
1881                         /* skip duplicate (or initial) slash */
1882                         if (*tptr == '/') {
1883                                 continue;
1884                         }
1885                         if (*tptr == '.') {
1886                                 /* skip extra "/./" */
1887                                 if (tptr[1] == '/' || !tptr[1]) {
1888                                         continue;
1889                                 }
1890                                 /* "..": be careful */
1891                                 if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
1892                                         ++tptr;
1893                                         if (urlp == urlcopy) /* protect root */
1894                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
1895                                         while (*--urlp != '/') /* omit previous dir */;
1896                                                 continue;
1897                                 }
1898                         }
1899                 }
1900                 *++urlp = *tptr;
1901         } while (*++tptr);
1902         *++urlp = '\0';       /* terminate after last character */
1903
1904         /* If URL is a directory, add '/' */
1905         if (urlp[-1] != '/') {
1906                 if (is_directory(urlcopy + 1, 1, &sb)) {
1907                         found_moved_temporarily = urlcopy;
1908                 }
1909         }
1910
1911         /* Log it */
1912         if (verbose > 1)
1913                 bb_error_msg("url:%s", urlcopy);
1914
1915         tptr = urlcopy;
1916         ip_allowed = checkPermIP();
1917         while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
1918                 /* have path1/path2 */
1919                 *tptr = '\0';
1920                 if (is_directory(urlcopy + 1, 1, &sb)) {
1921                         /* may have subdir config */
1922                         parse_conf(urlcopy + 1, SUBDIR_PARSE);
1923                         ip_allowed = checkPermIP();
1924                 }
1925                 *tptr = '/';
1926         }
1927
1928 #if ENABLE_FEATURE_HTTPD_PROXY
1929         proxy_entry = find_proxy_entry(urlcopy);
1930         if (proxy_entry)
1931                 header_buf = header_ptr = xmalloc(IOBUF_SIZE);
1932 #endif
1933
1934         if (http_major_version >= '0') {
1935                 /* Request was with "... HTTP/nXXX", and n >= 0 */
1936
1937                 /* Read until blank line for HTTP version specified, else parse immediate */
1938                 while (1) {
1939                         if (!get_line())
1940                                 break; /* EOF or error or empty line */
1941                         if (DEBUG)
1942                                 bb_error_msg("header: '%s'", iobuf);
1943
1944 #if ENABLE_FEATURE_HTTPD_PROXY
1945                         /* We need 2 more bytes for yet another "\r\n" -
1946                          * see near fdprintf(proxy_fd...) further below */
1947                         if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) {
1948                                 int len = strlen(iobuf);
1949                                 if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4)
1950                                         len = IOBUF_SIZE - (header_ptr - header_buf) - 4;
1951                                 memcpy(header_ptr, iobuf, len);
1952                                 header_ptr += len;
1953                                 header_ptr[0] = '\r';
1954                                 header_ptr[1] = '\n';
1955                                 header_ptr += 2;
1956                         }
1957 #endif
1958
1959 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1960                         /* Try and do our best to parse more lines */
1961                         if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
1962                                 /* extra read only for POST */
1963                                 if (prequest != request_GET
1964 #if ENABLE_FEATURE_HTTPD_CGI
1965                                  && prequest != request_HEAD
1966 #endif
1967                                 ) {
1968                                         tptr = skip_whitespace(iobuf + sizeof("Content-length:") - 1);
1969                                         if (!tptr[0])
1970                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
1971                                         /* not using strtoul: it ignores leading minus! */
1972                                         length = bb_strtou(tptr, NULL, 10);
1973                                         /* length is "ulong", but we need to pass it to int later */
1974                                         if (errno || length > INT_MAX)
1975                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
1976                                 }
1977                         }
1978 #endif
1979 #if ENABLE_FEATURE_HTTPD_CGI
1980                         else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
1981                                 cookie = xstrdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
1982                         } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
1983                                 content_type = xstrdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
1984                         } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
1985                                 referer = xstrdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
1986                         } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
1987                                 user_agent = xstrdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
1988                         } else if (STRNCASECMP(iobuf, "Host:") == 0) {
1989                                 host = xstrdup(skip_whitespace(iobuf + sizeof("Host:")-1));
1990                         } else if (STRNCASECMP(iobuf, "Accept:") == 0) {
1991                                 http_accept = xstrdup(skip_whitespace(iobuf + sizeof("Accept:")-1));
1992                         } else if (STRNCASECMP(iobuf, "Accept-Language:") == 0) {
1993                                 http_accept_language = xstrdup(skip_whitespace(iobuf + sizeof("Accept-Language:")-1));
1994                         }
1995 #endif
1996 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1997                         if (STRNCASECMP(iobuf, "Authorization:") == 0) {
1998                                 /* We only allow Basic credentials.
1999                                  * It shows up as "Authorization: Basic <user>:<passwd>" where
2000                                  * "<user>:<passwd>" is base64 encoded.
2001                                  */
2002                                 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
2003                                 if (STRNCASECMP(tptr, "Basic") != 0)
2004                                         continue;
2005                                 tptr += sizeof("Basic")-1;
2006                                 /* decodeBase64() skips whitespace itself */
2007                                 decodeBase64(tptr);
2008                                 authorized = check_user_passwd(urlcopy, tptr);
2009                         }
2010 #endif
2011 #if ENABLE_FEATURE_HTTPD_RANGES
2012                         if (STRNCASECMP(iobuf, "Range:") == 0) {
2013                                 /* We know only bytes=NNN-[MMM] */
2014                                 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
2015                                 if (strncmp(s, "bytes=", 6) == 0) {
2016                                         s += sizeof("bytes=")-1;
2017                                         range_start = BB_STRTOOFF(s, &s, 10);
2018                                         if (s[0] != '-' || range_start < 0) {
2019                                                 range_start = 0;
2020                                         } else if (s[1]) {
2021                                                 range_end = BB_STRTOOFF(s+1, NULL, 10);
2022                                                 if (errno || range_end < range_start)
2023                                                         range_start = 0;
2024                                         }
2025                                 }
2026                         }
2027 #endif
2028                 } /* while extra header reading */
2029         }
2030
2031         /* We are done reading headers, disable peer timeout */
2032         alarm(0);
2033
2034         if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || !ip_allowed) {
2035                 /* protect listing [/path]/httpd_conf or IP deny */
2036                 send_headers_and_exit(HTTP_FORBIDDEN);
2037         }
2038
2039 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2040         /* Case: no "Authorization:" was seen, but page does require passwd.
2041          * Check that with dummy user:pass */
2042         if (authorized < 0)
2043                 authorized = check_user_passwd(urlcopy, ":");
2044         if (!authorized)
2045                 send_headers_and_exit(HTTP_UNAUTHORIZED);
2046 #endif
2047
2048         if (found_moved_temporarily) {
2049                 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
2050         }
2051
2052 #if ENABLE_FEATURE_HTTPD_PROXY
2053         if (proxy_entry != NULL) {
2054                 int proxy_fd;
2055                 len_and_sockaddr *lsa;
2056
2057                 proxy_fd = socket(AF_INET, SOCK_STREAM, 0);
2058                 if (proxy_fd < 0)
2059                         send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2060                 lsa = host2sockaddr(proxy_entry->host_port, 80);
2061                 if (lsa == NULL)
2062                         send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2063                 if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0)
2064                         send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2065                 fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n",
2066                                 prequest, /* GET or POST */
2067                                 proxy_entry->url_to, /* url part 1 */
2068                                 urlcopy + strlen(proxy_entry->url_from), /* url part 2 */
2069                                 (g_query ? "?" : ""), /* "?" (maybe) */
2070                                 (g_query ? g_query : ""), /* query string (maybe) */
2071                                 http_major_version, http_minor_version);
2072                 header_ptr[0] = '\r';
2073                 header_ptr[1] = '\n';
2074                 header_ptr += 2;
2075                 write(proxy_fd, header_buf, header_ptr - header_buf);
2076                 free(header_buf); /* on the order of 8k, free it */
2077                 /* cgi_io_loop_and_exit needs to have two disctinct fds */
2078                 cgi_io_loop_and_exit(proxy_fd, dup(proxy_fd), length);
2079         }
2080 #endif
2081
2082         tptr = urlcopy + 1;      /* skip first '/' */
2083
2084 #if ENABLE_FEATURE_HTTPD_CGI
2085         if (strncmp(tptr, "cgi-bin/", 8) == 0) {
2086                 if (tptr[8] == '\0') {
2087                         /* protect listing "cgi-bin/" */
2088                         send_headers_and_exit(HTTP_FORBIDDEN);
2089                 }
2090                 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2091         }
2092 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
2093         {
2094                 char *suffix = strrchr(tptr, '.');
2095                 if (suffix) {
2096                         Htaccess *cur;
2097                         for (cur = script_i; cur; cur = cur->next) {
2098                                 if (strcmp(cur->before_colon + 1, suffix) == 0) {
2099                                         send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2100                                 }
2101                         }
2102                 }
2103         }
2104 #endif
2105         if (prequest != request_GET && prequest != request_HEAD) {
2106                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2107         }
2108 #endif  /* FEATURE_HTTPD_CGI */
2109
2110         if (urlp[-1] == '/')
2111                 strcpy(urlp, index_page);
2112         if (stat(tptr, &sb) == 0) {
2113                 file_size = sb.st_size;
2114                 last_mod = sb.st_mtime;
2115         }
2116 #if ENABLE_FEATURE_HTTPD_CGI
2117         else if (urlp[-1] == '/') {
2118                 /* It's a dir URL and there is no index.html
2119                  * Try cgi-bin/index.cgi */
2120                 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
2121                         urlp[0] = '\0';
2122                         g_query = urlcopy;
2123                         send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
2124                 }
2125         }
2126 #endif
2127         /* else {
2128          *      fall through to send_file, it errors out if open fails
2129          * }
2130          */
2131
2132         send_file_and_exit(tptr,
2133 #if ENABLE_FEATURE_HTTPD_CGI
2134                 (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS)
2135 #else
2136                 SEND_HEADERS_AND_BODY
2137 #endif
2138         );
2139 }
2140
2141 /*
2142  * The main http server function.
2143  * Given a socket, listen for new connections and farm out
2144  * the processing as a [v]forked process.
2145  * Never returns.
2146  */
2147 #if BB_MMU
2148 static void mini_httpd(int server_socket) NORETURN;
2149 static void mini_httpd(int server_socket)
2150 {
2151         /* NB: it's best to not use xfuncs in this loop before fork().
2152          * Otherwise server may die on transient errors (temporary
2153          * out-of-memory condition, etc), which is Bad(tm).
2154          * Try to do any dangerous calls after fork.
2155          */
2156         while (1) {
2157                 int n;
2158                 len_and_sockaddr fromAddr;
2159
2160                 /* Wait for connections... */
2161                 fromAddr.len = LSA_SIZEOF_SA;
2162                 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2163
2164                 if (n < 0)
2165                         continue;
2166                 /* set the KEEPALIVE option to cull dead connections */
2167                 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2168
2169                 if (fork() == 0) {
2170                         /* child */
2171                         /* Do not reload config on HUP */
2172                         signal(SIGHUP, SIG_IGN);
2173                         close(server_socket);
2174                         xmove_fd(n, 0);
2175                         xdup2(0, 1);
2176
2177                         handle_incoming_and_exit(&fromAddr);
2178                 }
2179                 /* parent, or fork failed */
2180                 close(n);
2181         } /* while (1) */
2182         /* never reached */
2183 }
2184 #else
2185 static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN;
2186 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2187 {
2188         char *argv_copy[argc + 2];
2189
2190         argv_copy[0] = argv[0];
2191         argv_copy[1] = (char*)"-i";
2192         memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2193
2194         /* NB: it's best to not use xfuncs in this loop before vfork().
2195          * Otherwise server may die on transient errors (temporary
2196          * out-of-memory condition, etc), which is Bad(tm).
2197          * Try to do any dangerous calls after fork.
2198          */
2199         while (1) {
2200                 int n;
2201                 len_and_sockaddr fromAddr;
2202
2203                 /* Wait for connections... */
2204                 fromAddr.len = LSA_SIZEOF_SA;
2205                 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2206
2207                 if (n < 0)
2208                         continue;
2209                 /* set the KEEPALIVE option to cull dead connections */
2210                 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2211
2212                 if (vfork() == 0) {
2213                         /* child */
2214                         /* Do not reload config on HUP */
2215                         signal(SIGHUP, SIG_IGN);
2216                         close(server_socket);
2217                         xmove_fd(n, 0);
2218                         xdup2(0, 1);
2219
2220                         /* Run a copy of ourself in inetd mode */
2221                         re_exec(argv_copy);
2222                 }
2223                 /* parent, or vfork failed */
2224                 close(n);
2225         } /* while (1) */
2226         /* never reached */
2227 }
2228 #endif
2229
2230 /*
2231  * Process a HTTP connection on stdin/out.
2232  * Never returns.
2233  */
2234 static void mini_httpd_inetd(void) NORETURN;
2235 static void mini_httpd_inetd(void)
2236 {
2237         len_and_sockaddr fromAddr;
2238
2239         memset(&fromAddr, 0, sizeof(fromAddr));
2240         fromAddr.len = LSA_SIZEOF_SA;
2241         /* NB: can fail if user runs it by hand and types in http cmds */
2242         getpeername(0, &fromAddr.u.sa, &fromAddr.len);
2243         handle_incoming_and_exit(&fromAddr);
2244 }
2245
2246 static void sighup_handler(int sig UNUSED_PARAM)
2247 {
2248         parse_conf(default_path_httpd_conf, SIGNALED_PARSE);
2249 }
2250
2251 enum {
2252         c_opt_config_file = 0,
2253         d_opt_decode_url,
2254         h_opt_home_httpd,
2255         IF_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2256         IF_FEATURE_HTTPD_BASIC_AUTH(    r_opt_realm     ,)
2257         IF_FEATURE_HTTPD_AUTH_MD5(      m_opt_md5       ,)
2258         IF_FEATURE_HTTPD_SETUID(        u_opt_setuid    ,)
2259         p_opt_port      ,
2260         p_opt_inetd     ,
2261         p_opt_foreground,
2262         p_opt_verbose   ,
2263         OPT_CONFIG_FILE = 1 << c_opt_config_file,
2264         OPT_DECODE_URL  = 1 << d_opt_decode_url,
2265         OPT_HOME_HTTPD  = 1 << h_opt_home_httpd,
2266         OPT_ENCODE_URL  = IF_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2267         OPT_REALM       = IF_FEATURE_HTTPD_BASIC_AUTH(    (1 << r_opt_realm     )) + 0,
2268         OPT_MD5         = IF_FEATURE_HTTPD_AUTH_MD5(      (1 << m_opt_md5       )) + 0,
2269         OPT_SETUID      = IF_FEATURE_HTTPD_SETUID(        (1 << u_opt_setuid    )) + 0,
2270         OPT_PORT        = 1 << p_opt_port,
2271         OPT_INETD       = 1 << p_opt_inetd,
2272         OPT_FOREGROUND  = 1 << p_opt_foreground,
2273         OPT_VERBOSE     = 1 << p_opt_verbose,
2274 };
2275
2276
2277 int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2278 int httpd_main(int argc UNUSED_PARAM, char **argv)
2279 {
2280         int server_socket = server_socket; /* for gcc */
2281         unsigned opt;
2282         char *url_for_decode;
2283         IF_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2284         IF_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2285         IF_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2286         IF_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2287
2288         INIT_G();
2289
2290 #if ENABLE_LOCALE_SUPPORT
2291         /* Undo busybox.c: we want to speak English in http (dates etc) */
2292         setlocale(LC_TIME, "C");
2293 #endif
2294
2295         home_httpd = xrealloc_getcwd_or_warn(NULL);
2296         /* -v counts, -i implies -f */
2297         opt_complementary = "vv:if";
2298         /* We do not "absolutize" path given by -h (home) opt.
2299          * If user gives relative path in -h,
2300          * $SCRIPT_FILENAME will not be set. */
2301         opt = getopt32(argv, "c:d:h:"
2302                         IF_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2303                         IF_FEATURE_HTTPD_BASIC_AUTH("r:")
2304                         IF_FEATURE_HTTPD_AUTH_MD5("m:")
2305                         IF_FEATURE_HTTPD_SETUID("u:")
2306                         "p:ifv",
2307                         &configFile, &url_for_decode, &home_httpd
2308                         IF_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2309                         IF_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2310                         IF_FEATURE_HTTPD_AUTH_MD5(, &pass)
2311                         IF_FEATURE_HTTPD_SETUID(, &s_ugid)
2312                         , &bind_addr_or_port
2313                         , &verbose
2314                 );
2315         if (opt & OPT_DECODE_URL) {
2316                 fputs(decodeString(url_for_decode, 1), stdout);
2317                 return 0;
2318         }
2319 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2320         if (opt & OPT_ENCODE_URL) {
2321                 fputs(encodeString(url_for_encode), stdout);
2322                 return 0;
2323         }
2324 #endif
2325 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2326         if (opt & OPT_MD5) {
2327                 puts(pw_encrypt(pass, "$1$", 1));
2328                 return 0;
2329         }
2330 #endif
2331 #if ENABLE_FEATURE_HTTPD_SETUID
2332         if (opt & OPT_SETUID) {
2333                 xget_uidgid(&ugid, s_ugid);
2334         }
2335 #endif
2336
2337 #if !BB_MMU
2338         if (!(opt & OPT_FOREGROUND)) {
2339                 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2340         }
2341 #endif
2342
2343         xchdir(home_httpd);
2344         if (!(opt & OPT_INETD)) {
2345                 signal(SIGCHLD, SIG_IGN);
2346                 server_socket = openServer();
2347 #if ENABLE_FEATURE_HTTPD_SETUID
2348                 /* drop privileges */
2349                 if (opt & OPT_SETUID) {
2350                         if (ugid.gid != (gid_t)-1) {
2351                                 if (setgroups(1, &ugid.gid) == -1)
2352                                         bb_perror_msg_and_die("setgroups");
2353                                 xsetgid(ugid.gid);
2354                         }
2355                         xsetuid(ugid.uid);
2356                 }
2357 #endif
2358         }
2359
2360 #if 0
2361         /* User can do it himself: 'env - PATH="$PATH" httpd'
2362          * We don't do it because we don't want to screw users
2363          * which want to do
2364          * 'env - VAR1=val1 VAR2=val2 httpd'
2365          * and have VAR1 and VAR2 values visible in their CGIs.
2366          * Besides, it is also smaller. */
2367         {
2368                 char *p = getenv("PATH");
2369                 /* env strings themself are not freed, no need to xstrdup(p): */
2370                 clearenv();
2371                 if (p)
2372                         putenv(p - 5);
2373 //              if (!(opt & OPT_INETD))
2374 //                      setenv_long("SERVER_PORT", ???);
2375         }
2376 #endif
2377
2378         parse_conf(default_path_httpd_conf, FIRST_PARSE);
2379         if (!(opt & OPT_INETD))
2380                 signal(SIGHUP, sighup_handler);
2381
2382         xfunc_error_retval = 0;
2383         if (opt & OPT_INETD)
2384                 mini_httpd_inetd();
2385 #if BB_MMU
2386         if (!(opt & OPT_FOREGROUND))
2387                 bb_daemonize(0); /* don't change current directory */
2388         mini_httpd(server_socket); /* never returns */
2389 #else
2390         mini_httpd_nommu(server_socket, argc, argv); /* never returns */
2391 #endif
2392         /* return 0; */
2393 }