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