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 contains "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 server 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  * A:172.20.         # Allow address from 172.20.0.0/16
  41  * A:10.0.0.0/25     # Allow any address from 10.0.0.0-10.0.0.127
  42  * A:10.0.0.0/255.255.255.128  # Allow any address that previous set
  43  * A:127.0.0.1       # Allow local loopback connections
  44  * D:*               # Deny from other IP connections
  45  * /cgi-bin:foo:bar  # Require user foo, pwd bar on urls starting with /cgi-bin/
  46  * /adm:admin:setup  # Require user admin, pwd setup on urls starting with /adm/
  47  * /adm:toor:PaSsWd  # or user toor, pwd PaSsWd on urls starting with /adm/
  48  * .au:audio/basic   # additional mime type for audio.au files
  49  * *.php:/path/php   # running cgi.php scripts through an interpreter
  50  *
  51  * A/D may be as a/d or allow/deny - first char case insensitive
  52  * Deny IP rules take precedence over allow rules.
  53  *
  54  *
  55  * The Deny/Allow IP logic:
  56  *
  57  *  - Default is to allow all.  No addresses are denied unless
  58  *         denied with a D: rule.
  59  *  - Order of Deny/Allow rules is significant
  60  *  - Deny rules take precedence over allow rules.
  61  *  - If a deny all rule (D:*) is used it acts as a catch-all for unmatched
  62  *       addresses.
  63  *  - Specification of Allow all (A:*) is a no-op
  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  *
  88  * If -c is not set, an attempt will be made to open the default
  89  * root configuration file.  If -c is set and the file is not found, the
  90  * server exits with an error.
  91  *
  92 */
  93
  94
  95 #include "busybox.h"
  96
  97
  98 static const char httpdVersion[] = "busybox httpd/1.35 6-Oct-2004";
  99 static const char default_path_httpd_conf[] = "/etc";
 100 static const char httpd_conf[] = "httpd.conf";
 101 static const char home[] = "./";
 102
 103 #define TIMEOUT 60
 104
 105 // Note: busybox xfuncs are not used because we want the server to keep running
 106 //       if something bad happens due to a malformed user request.
 107 //       As a result, all memory allocation after daemonize
 108 //       is checked rigorously
 109
 110 //#define DEBUG 1
 111
 112 #ifndef DEBUG
 113 # define DEBUG 0
 114 #endif
 115
 116 #define MAX_MEMORY_BUFF 8192    /* IO buffer */
 117
 118 typedef struct HT_ACCESS {
 119         char *after_colon;
 120         struct HT_ACCESS *next;
 121         char before_colon[1];         /* really bigger, must last */
 122 } Htaccess;
 123
 124 typedef struct HT_ACCESS_IP {
 125         unsigned int ip;
 126         unsigned int mask;
 127         int allow_deny;
 128         struct HT_ACCESS_IP *next;
 129 } Htaccess_IP;
 130
 131 typedef struct {
 132         char buf[MAX_MEMORY_BUFF];
 133
 134         USE_FEATURE_HTTPD_BASIC_AUTH(const char *realm;)
 135         USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
 136
 137         const char *query;
 138
 139         USE_FEATURE_HTTPD_CGI(char *referer;)
 140
 141         const char *configFile;
 142
 143         unsigned int rmt_ip;
 144 #if ENABLE_FEATURE_HTTPD_CGI || DEBUG
 145         char rmt_ip_str[16];     /* for set env REMOTE_ADDR */
 146 #endif
 147         unsigned port;           /* server initial port and for
 148                                                       set env REMOTE_PORT */
 149         const char *found_mime_type;
 150         const char *found_moved_temporarily;
 151
 152         off_t ContentLength;          /* -1 - unknown */
 153         time_t last_mod;
 154
 155         Htaccess_IP *ip_a_d;          /* config allow/deny lines */
 156         int flg_deny_all;
 157 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 158         Htaccess *auth;               /* config user:password lines */
 159 #endif
 160 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 161         Htaccess *mime_a;             /* config mime types */
 162 #endif
 163
 164         int server_socket;
 165         int accepted_socket;
 166         volatile int alarm_signaled;
 167
 168 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 169         Htaccess *script_i;           /* config script interpreters */
 170 #endif
 171 } HttpdConfig;
 172
 173 static HttpdConfig *config;
 174
 175 static const char request_GET[] = "GET";    /* size algorithmic optimize */
 176
 177 static const char* const suffixTable [] = {
 178 /* Warning: shorted equivalent suffix in one line must be first */
 179         ".htm.html", "text/html",
 180         ".jpg.jpeg", "image/jpeg",
 181         ".gif", "image/gif",
 182         ".png", "image/png",
 183         ".txt.h.c.cc.cpp", "text/plain",
 184         ".css", "text/css",
 185         ".wav", "audio/wav",
 186         ".avi", "video/x-msvideo",
 187         ".qt.mov", "video/quicktime",
 188         ".mpe.mpeg", "video/mpeg",
 189         ".mid.midi", "audio/midi",
 190         ".mp3", "audio/mpeg",
 191 #if 0                        /* unpopular */
 192         ".au", "audio/basic",
 193         ".pac", "application/x-ns-proxy-autoconfig",
 194         ".vrml.wrl", "model/vrml",
 195 #endif
 196         0, "application/octet-stream" /* default */
 197 };
 198
 199 typedef enum {
 200         HTTP_OK = 200,
 201         HTTP_MOVED_TEMPORARILY = 302,
 202         HTTP_BAD_REQUEST = 400,       /* malformed syntax */
 203         HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
 204         HTTP_NOT_FOUND = 404,
 205         HTTP_FORBIDDEN = 403,
 206         HTTP_REQUEST_TIMEOUT = 408,
 207         HTTP_NOT_IMPLEMENTED = 501,   /* used for unrecognized requests */
 208         HTTP_INTERNAL_SERVER_ERROR = 500,
 209 #if 0 /* future use */
 210         HTTP_CONTINUE = 100,
 211         HTTP_SWITCHING_PROTOCOLS = 101,
 212         HTTP_CREATED = 201,
 213         HTTP_ACCEPTED = 202,
 214         HTTP_NON_AUTHORITATIVE_INFO = 203,
 215         HTTP_NO_CONTENT = 204,
 216         HTTP_MULTIPLE_CHOICES = 300,
 217         HTTP_MOVED_PERMANENTLY = 301,
 218         HTTP_NOT_MODIFIED = 304,
 219         HTTP_PAYMENT_REQUIRED = 402,
 220         HTTP_BAD_GATEWAY = 502,
 221         HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
 222         HTTP_RESPONSE_SETSIZE = 0xffffffff
 223 #endif
 224 } HttpResponseNum;
 225
 226 typedef struct {
 227         HttpResponseNum type;
 228         const char *name;
 229         const char *info;
 230 } HttpEnumString;
 231
 232 static const HttpEnumString httpResponseNames[] = {
 233         { HTTP_OK, "OK", NULL },
 234         { HTTP_MOVED_TEMPORARILY, "Found", "Directories must end with a slash." },
 235         { HTTP_REQUEST_TIMEOUT, "Request Timeout",
 236                 "No request appeared within a reasonable time period." },
 237         { HTTP_NOT_IMPLEMENTED, "Not Implemented",
 238                 "The requested method is not recognized by this server." },
 239 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 240         { HTTP_UNAUTHORIZED, "Unauthorized", "" },
 241 #endif
 242         { HTTP_NOT_FOUND, "Not Found",
 243                 "The requested URL was not found on this server." },
 244         { HTTP_BAD_REQUEST, "Bad Request", "Unsupported method." },
 245         { HTTP_FORBIDDEN, "Forbidden", "" },
 246         { HTTP_INTERNAL_SERVER_ERROR, "Internal Server Error",
 247                 "Internal Server Error" },
 248 #if 0                               /* not implemented */
 249         { HTTP_CREATED, "Created" },
 250         { HTTP_ACCEPTED, "Accepted" },
 251         { HTTP_NO_CONTENT, "No Content" },
 252         { HTTP_MULTIPLE_CHOICES, "Multiple Choices" },
 253         { HTTP_MOVED_PERMANENTLY, "Moved Permanently" },
 254         { HTTP_NOT_MODIFIED, "Not Modified" },
 255         { HTTP_BAD_GATEWAY, "Bad Gateway", "" },
 256         { HTTP_SERVICE_UNAVAILABLE, "Service Unavailable", "" },
 257 #endif
 258 };
 259
 260
 261 static const char RFC1123FMT[] = "%a, %d %b %Y %H:%M:%S GMT";
 262
 263
 264 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
 265
 266
 267 static int scan_ip(const char **ep, unsigned int *ip, unsigned char endc)
 268 {
 269         const char *p = *ep;
 270         int auto_mask = 8;
 271         int j;
 272
 273         *ip = 0;
 274         for (j = 0; j < 4; j++) {
 275                 unsigned int octet;
 276
 277                 if ((*p < '0' || *p > '9') && (*p != '/' || j == 0) && *p != 0)
 278                         return -auto_mask;
 279                 octet = 0;
 280                 while (*p >= '0' && *p <= '9') {
 281                         octet *= 10;
 282                         octet += *p - '0';
 283                         if (octet > 255)
 284                                 return -auto_mask;
 285                         p++;
 286                 }
 287                 if (*p == '.')
 288                         p++;
 289                 if (*p != '/' && *p != 0)
 290                         auto_mask += 8;
 291                 *ip = ((*ip) << 8) | octet;
 292         }
 293         if (*p != 0) {
 294                 if (*p != endc)
 295                         return -auto_mask;
 296                 p++;
 297                 if (*p == 0)
 298                         return -auto_mask;
 299         }
 300         *ep = p;
 301         return auto_mask;
 302 }
 303
 304 static int scan_ip_mask(const char *ipm, unsigned int *ip, unsigned int *mask)
 305 {
 306         int i;
 307         unsigned int msk;
 308
 309         i = scan_ip(&ipm, ip, '/');
 310         if (i < 0)
 311                 return i;
 312         if (*ipm) {
 313                 const char *p = ipm;
 314
 315                 i = 0;
 316                 while (*p) {
 317                         if (*p < '0' || *p > '9') {
 318                                 if (*p == '.') {
 319                                         i = scan_ip(&ipm, mask, 0);
 320                                         return i != 32;
 321                                 }
 322                                 return -1;
 323                         }
 324                         i *= 10;
 325                         i += *p - '0';
 326                         p++;
 327                 }
 328         }
 329         if (i > 32 || i < 0)
 330                 return -1;
 331         msk = 0x80000000;
 332         *mask = 0;
 333         while (i > 0) {
 334                 *mask |= msk;
 335                 msk >>= 1;
 336                 i--;
 337         }
 338         return 0;
 339 }
 340
 341 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
 342  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
 343  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 344 static void free_config_lines(Htaccess **pprev)
 345 {
 346         Htaccess *prev = *pprev;
 347
 348         while (prev) {
 349                 Htaccess *cur = prev;
 350
 351                 prev = cur->next;
 352                 free(cur);
 353         }
 354         *pprev = NULL;
 355 }
 356 #endif
 357
 358 /* flag */
 359 #define FIRST_PARSE          0
 360 #define SUBDIR_PARSE         1
 361 #define SIGNALED_PARSE       2
 362 #define FIND_FROM_HTTPD_ROOT 3
 363 /****************************************************************************
 364  *
 365  > $Function: parse_conf()
 366  *
 367  * $Description: parse configuration file into in-memory linked list.
 368  *
 369  * The first non-white character is examined to determine if the config line
 370  * is one of the following:
 371  *    .ext:mime/type   # new mime type not compiled into httpd
 372  *    [adAD]:from      # ip address allow/deny, * for wildcard
 373  *    /path:user:pass  # username/password
 374  *
 375  * Any previous IP rules are discarded.
 376  * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
 377  * are also discarded.  That is, previous settings are retained if flag is
 378  * SUBDIR_PARSE.
 379  *
 380  * $Parameters:
 381  *      (const char *) path . . null for ip address checks, path for password
 382  *                              checks.
 383  *      (int) flag  . . . . . . the source of the parse request.
 384  *
 385  * $Return: (None)
 386  *
 387  ****************************************************************************/
 388 static void parse_conf(const char *path, int flag)
 389 {
 390         FILE *f;
 391 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 392         Htaccess *prev;
 393 #endif
 394 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
 395  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
 396  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 397         Htaccess *cur;
 398 #endif
 399
 400         const char *cf = config->configFile;
 401         char buf[160];
 402         char *p0 = NULL;
 403         char *c, *p;
 404
 405         /* free previous ip setup if present */
 406         Htaccess_IP *pip = config->ip_a_d;
 407
 408         while (pip) {
 409                 Htaccess_IP *cur_ipl = pip;
 410
 411                 pip = cur_ipl->next;
 412                 free(cur_ipl);
 413         }
 414         config->ip_a_d = NULL;
 415
 416         config->flg_deny_all = 0;
 417
 418 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
 419  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
 420  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 421         /* retain previous auth and mime config only for subdir parse */
 422         if (flag != SUBDIR_PARSE) {
 423 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 424                 free_config_lines(&config->auth);
 425 #endif
 426 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 427                 free_config_lines(&config->mime_a);
 428 #endif
 429 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 430                 free_config_lines(&config->script_i);
 431 #endif
 432         }
 433 #endif
 434
 435         if (flag == SUBDIR_PARSE || cf == NULL) {
 436                 cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
 437                 if (cf == NULL) {
 438                         if (flag == FIRST_PARSE)
 439                         bb_error_msg_and_die(bb_msg_memory_exhausted);
 440                         return;
 441                 }
 442                 sprintf((char *)cf, "%s/%s", path, httpd_conf);
 443         }
 444
 445         while ((f = fopen(cf, "r")) == NULL) {
 446                 if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
 447                         /* config file not found, no changes to config */
 448                         return;
 449                 }
 450                 if (config->configFile && flag == FIRST_PARSE) /* if -c option given */
 451                         bb_perror_msg_and_die("%s", cf);
 452                 flag = FIND_FROM_HTTPD_ROOT;
 453                 cf = httpd_conf;
 454         }
 455
 456 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 457                 prev = config->auth;
 458 #endif
 459                 /* This could stand some work */
 460         while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
 461                 c = NULL;
 462                 for (p = p0; *p0 != 0 && *p0 != '#'; p0++) {
 463                         if (!isspace(*p0)) {
 464                                 *p++ = *p0;
 465                                 if (*p0 == ':' && c == NULL)
 466                                 c = p;
 467                         }
 468                 }
 469                 *p = 0;
 470
 471                 /* test for empty or strange line */
 472                 if (c == NULL || *c == 0)
 473                         continue;
 474                 p0 = buf;
 475                 if (*p0 == 'd')
 476                                 *p0 = 'D';
 477                 if (*c == '*') {
 478                         if (*p0 == 'D') {
 479                                 /* memorize deny all */
 480                                 config->flg_deny_all++;
 481                         }
 482                         /* skip default other "word:*" config lines */
 483                         continue;
 484                 }
 485
 486                 if (*p0 == 'a')
 487                         *p0 = 'A';
 488                 else if (*p0 != 'D' && *p0 != 'A'
 489 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 490                          && *p0 != '/'
 491 #endif
 492 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 493                          && *p0 != '.'
 494 #endif
 495 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 496                          && *p0 != '*'
 497 #endif
 498                         )
 499                          continue;
 500                 if (*p0 == 'A' || *p0 == 'D') {
 501                         /* storing current config IP line */
 502                         pip = calloc(1, sizeof(Htaccess_IP));
 503                         if (pip) {
 504                                 if (scan_ip_mask(c, &(pip->ip), &(pip->mask))) {
 505                                         /* syntax IP{/mask} error detected, protect all */
 506                                         *p0 = 'D';
 507                                         pip->mask = 0;
 508                                 }
 509                                 pip->allow_deny = *p0;
 510                                 if (*p0 == 'D') {
 511                                         /* Deny:form_IP move top */
 512                                         pip->next = config->ip_a_d;
 513                                         config->ip_a_d = pip;
 514                                 } else {
 515                                         /* add to bottom A:form_IP config line */
 516                                         Htaccess_IP *prev_IP = config->ip_a_d;
 517
 518                                         if (prev_IP == NULL) {
 519                                                 config->ip_a_d = pip;
 520                                         } else {
 521                                                 while (prev_IP->next)
 522                                                         prev_IP = prev_IP->next;
 523                                                 prev_IP->next = pip;
 524                                         }
 525                                 }
 526                         }
 527                         continue;
 528                 }
 529 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 530                 if (*p0 == '/') {
 531                         /* make full path from httpd root / curent_path / config_line_path */
 532                         cf = flag == SUBDIR_PARSE ? path : "";
 533                         p0 = malloc(strlen(cf) + (c - buf) + 2 + strlen(c));
 534                         if (p0 == NULL)
 535                                 continue;
 536                         c[-1] = 0;
 537                         sprintf(p0, "/%s%s", cf, buf);
 538
 539                         /* another call bb_simplify_path */
 540                         cf = p = p0;
 541
 542                         do {
 543                                 if (*p == '/') {
 544                                         if (*cf == '/') {    /* skip duplicate (or initial) slash */
 545                                                 continue;
 546                                         } else if (*cf == '.') {
 547                                                 if (cf[1] == '/' || cf[1] == 0) { /* remove extra '.' */
 548                                                         continue;
 549                                                 } else if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == 0)) {
 550                                                         ++cf;
 551                                                         if (p > p0) {
 552                                                                 while (*--p != '/') /* omit previous dir */;
 553                                                         }
 554                                                         continue;
 555                                                 }
 556                                         }
 557                                 }
 558                                 *++p = *cf;
 559                         } while (*++cf);
 560
 561                         if ((p == p0) || (*p != '/')) {      /* not a trailing slash */
 562                                 ++p;                             /* so keep last character */
 563                         }
 564                         *p = 0;
 565                         sprintf(p0, "%s:%s", p0, c);
 566                 }
 567 #endif
 568
 569 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
 570  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
 571  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 572                 /* storing current config line */
 573                 cur = calloc(1, sizeof(Htaccess) + strlen(p0));
 574                 if (cur) {
 575                         cf = strcpy(cur->before_colon, p0);
 576                         c = strchr(cf, ':');
 577                         *c++ = 0;
 578                         cur->after_colon = c;
 579 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 580                         if (*cf == '.') {
 581                                 /* config .mime line move top for overwrite previous */
 582                                 cur->next = config->mime_a;
 583                                 config->mime_a = cur;
 584                                 continue;
 585                         }
 586 #endif
 587 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 588                         if (*cf == '*' && cf[1] == '.') {
 589                                 /* config script interpreter line move top for overwrite previous */
 590                                 cur->next = config->script_i;
 591                                 config->script_i = cur;
 592                                 continue;
 593                         }
 594 #endif
 595 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 596                         free(p0);
 597                         if (prev == NULL) {
 598                                 /* first line */
 599                                 config->auth = prev = cur;
 600                         } else {
 601                                 /* sort path, if current lenght eq or bigger then move up */
 602                                 Htaccess *prev_hti = config->auth;
 603                                 size_t l = strlen(cf);
 604                                 Htaccess *hti;
 605
 606                                 for (hti = prev_hti; hti; hti = hti->next) {
 607                                         if (l >= strlen(hti->before_colon)) {
 608                                                 /* insert before hti */
 609                                                 cur->next = hti;
 610                                                 if (prev_hti != hti) {
 611                                                         prev_hti->next = cur;
 612                                                 } else {
 613                                                         /* insert as top */
 614                                                         config->auth = cur;
 615                                                 }
 616                                                 break;
 617                                         }
 618                                         if (prev_hti != hti)
 619                                                 prev_hti = prev_hti->next;
 620                                 }
 621                                 if (!hti) {       /* not inserted, add to bottom */
 622                                         prev->next = cur;
 623                                         prev = cur;
 624                                 }
 625                         }
 626 #endif
 627                 }
 628 #endif
 629          }
 630          fclose(f);
 631 }
 632
 633 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
 634 /****************************************************************************
 635  *
 636  > $Function: encodeString()
 637  *
 638  * $Description: Given a string, html encode special characters.
 639  *   This is used for the -e command line option to provide an easy way
 640  *   for scripts to encode result data without confusing browsers.  The
 641  *   returned string pointer is memory allocated by malloc().
 642  *
 643  * $Parameters:
 644  *      (const char *) string . . The first string to encode.
 645  *
 646  * $Return: (char *) . . . .. . . A pointer to the encoded string.
 647  *
 648  * $Errors: Returns a null string ("") if memory is not available.
 649  *
 650  ****************************************************************************/
 651 static char *encodeString(const char *string)
 652 {
 653         /* take the simple route and encode everything */
 654         /* could possibly scan once to get length.     */
 655         int len = strlen(string);
 656         char *out = malloc(len * 6 + 1);
 657         char *p = out;
 658         char ch;
 659
 660         if (!out) return "";
 661         while ((ch = *string++)) {
 662                 // very simple check for what to encode
 663                 if (isalnum(ch)) *p++ = ch;
 664                 else p += sprintf(p, "&#%d;", (unsigned char) ch);
 665         }
 666         *p = 0;
 667         return out;
 668 }
 669 #endif          /* FEATURE_HTTPD_ENCODE_URL_STR */
 670
 671 /****************************************************************************
 672  *
 673  > $Function: decodeString()
 674  *
 675  * $Description: Given a URL encoded string, convert it to plain ascii.
 676  *   Since decoding always makes strings smaller, the decode is done in-place.
 677  *   Thus, callers should strdup() the argument if they do not want the
 678  *   argument modified.  The return is the original pointer, allowing this
 679  *   function to be easily used as arguments to other functions.
 680  *
 681  * $Parameters:
 682  *      (char *) string . . . The first string to decode.
 683  *      (int)    option_d . . 1 if called for httpd -d
 684  *
 685  * $Return: (char *)  . . . . A pointer to the decoded string (same as input).
 686  *
 687  * $Errors: None
 688  *
 689  ****************************************************************************/
 690 static char *decodeString(char *orig, int option_d)
 691 {
 692         /* note that decoded string is always shorter than original */
 693         char *string = orig;
 694         char *ptr = string;
 695         char c;
 696
 697         while ((c = *ptr++) != '\0') {
 698                 unsigned value1, value2;
 699
 700                 if (option_d && c == '+') {
 701                         *string++ = ' ';
 702                         continue;
 703                 }
 704                 if (c != '%') {
 705                         *string++ = c;
 706                         continue;
 707                 }
 708                 if (sscanf(ptr, "%1X", &value1) != 1
 709                  || sscanf(ptr+1, "%1X", &value2) != 1
 710                 ) {
 711                         if (!option_d)
 712                                 return NULL;
 713                         *string++ = '%';
 714                         continue;
 715                 }
 716                 value1 = value1 * 16 + value2;
 717                 if (!option_d && (value1 == '/' || value1 == '\0')) {
 718                         /* caller takes it as indication of invalid
 719                          * (dangerous wrt exploits) chars */
 720                         return orig + 1;
 721                 }
 722                 *string++ = value1;
 723                 ptr += 2;
 724         }
 725         *string = '\0';
 726         return orig;
 727 }
 728
 729
 730 #if ENABLE_FEATURE_HTTPD_CGI
 731 /****************************************************************************
 732  * setenv helpers
 733  ****************************************************************************/
 734 static void setenv1(const char *name, const char *value)
 735 {
 736         if (!value)
 737                 value = "";
 738         setenv(name, value, 1);
 739 }
 740 static void setenv_long(const char *name, long value)
 741 {
 742         char buf[sizeof(value)*3 + 1];
 743         sprintf(buf, "%ld", value);
 744         setenv(name, buf, 1);
 745 }
 746 #endif
 747
 748 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 749 /****************************************************************************
 750  *
 751  > $Function: decodeBase64()
 752  *
 753  > $Description: Decode a base 64 data stream as per rfc1521.
 754  *    Note that the rfc states that none base64 chars are to be ignored.
 755  *    Since the decode always results in a shorter size than the input, it is
 756  *    OK to pass the input arg as an output arg.
 757  *
 758  * $Parameter:
 759  *      (char *) Data . . . . A pointer to a base64 encoded string.
 760  *                            Where to place the decoded data.
 761  *
 762  * $Return: void
 763  *
 764  * $Errors: None
 765  *
 766  ****************************************************************************/
 767 static void decodeBase64(char *Data)
 768 {
 769
 770         const unsigned char *in = (const unsigned char *)Data;
 771         // The decoded size will be at most 3/4 the size of the encoded
 772         unsigned long ch = 0;
 773         int i = 0;
 774
 775         while (*in) {
 776                 int t = *in++;
 777
 778                 if (t >= '0' && t <= '9')
 779                         t = t - '0' + 52;
 780                 else if (t >= 'A' && t <= 'Z')
 781                         t = t - 'A';
 782                 else if (t >= 'a' && t <= 'z')
 783                         t = t - 'a' + 26;
 784                 else if (t == '+')
 785                         t = 62;
 786                 else if (t == '/')
 787                         t = 63;
 788                 else if (t == '=')
 789                         t = 0;
 790                 else
 791                         continue;
 792
 793                 ch = (ch << 6) | t;
 794                 i++;
 795                 if (i == 4) {
 796                         *Data++ = (char) (ch >> 16);
 797                         *Data++ = (char) (ch >> 8);
 798                         *Data++ = (char) ch;
 799                         i = 0;
 800                 }
 801         }
 802         *Data = 0;
 803 }
 804 #endif
 805
 806
 807 /****************************************************************************
 808  *
 809  > $Function: openServer()
 810  *
 811  * $Description: create a listen server socket on the designated port.
 812  *
 813  * $Return: (int)  . . . A connection socket. -1 for errors.
 814  *
 815  * $Errors: None
 816  *
 817  ****************************************************************************/
 818 static int openServer(void)
 819 {
 820         struct sockaddr_in lsocket;
 821         int fd;
 822
 823         /* create the socket right now */
 824         /* inet_addr() returns a value that is already in network order */
 825         memset(&lsocket, 0, sizeof(lsocket));
 826         lsocket.sin_family = AF_INET;
 827         lsocket.sin_addr.s_addr = INADDR_ANY;
 828         lsocket.sin_port = htons(config->port);
 829         fd = xsocket(AF_INET, SOCK_STREAM, 0);
 830         /* tell the OS it's OK to reuse a previous address even though */
 831         /* it may still be in a close down state.  Allows bind to succeed. */
 832 #ifdef SO_REUSEPORT
 833         {
 834                 static const int on = 1;
 835                 setsockopt(fd, SOL_SOCKET, SO_REUSEPORT,
 836                                 (void *)&on, sizeof(on));
 837         }
 838 #else
 839         setsockopt_reuseaddr(fd);
 840 #endif
 841         xbind(fd, (struct sockaddr *)&lsocket, sizeof(lsocket));
 842         xlisten(fd, 9);
 843         signal(SIGCHLD, SIG_IGN);   /* prevent zombie (defunct) processes */
 844         return fd;
 845 }
 846
 847 /****************************************************************************
 848  *
 849  > $Function: sendHeaders()
 850  *
 851  * $Description: Create and send HTTP response headers.
 852  *   The arguments are combined and sent as one write operation.  Note that
 853  *   IE will puke big-time if the headers are not sent in one packet and the
 854  *   second packet is delayed for any reason.
 855  *
 856  * $Parameter:
 857  *      (HttpResponseNum) responseNum . . . The result code to send.
 858  *
 859  * $Return: (int)  . . . . writing errors
 860  *
 861  ****************************************************************************/
 862 static int sendHeaders(HttpResponseNum responseNum)
 863 {
 864         char *buf = config->buf;
 865         const char *responseString = "";
 866         const char *infoString = 0;
 867         const char *mime_type;
 868         unsigned int i;
 869         time_t timer = time(0);
 870         char timeStr[80];
 871         int len;
 872         enum {
 873                 numNames = sizeof(httpResponseNames) / sizeof(httpResponseNames[0])
 874         };
 875
 876         for (i = 0; i < numNames; i++) {
 877                 if (httpResponseNames[i].type == responseNum) {
 878                         responseString = httpResponseNames[i].name;
 879                         infoString = httpResponseNames[i].info;
 880                         break;
 881                 }
 882         }
 883         /* error message is HTML */
 884         mime_type = responseNum == HTTP_OK ?
 885                                 config->found_mime_type : "text/html";
 886
 887         /* emit the current date */
 888         strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&timer));
 889         len = sprintf(buf,
 890                 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
 891                 "Date: %s\r\nConnection: close\r\n",
 892                         responseNum, responseString, mime_type, timeStr);
 893
 894 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 895         if (responseNum == HTTP_UNAUTHORIZED) {
 896                 len += sprintf(buf+len, "WWW-Authenticate: Basic realm=\"%s\"\r\n",
 897                                                                     config->realm);
 898         }
 899 #endif
 900         if (responseNum == HTTP_MOVED_TEMPORARILY) {
 901                 len += sprintf(buf+len, "Location: %s/%s%s\r\n",
 902                                 config->found_moved_temporarily,
 903                                 (config->query ? "?" : ""),
 904                                 (config->query ? config->query : ""));
 905         }
 906
 907         if (config->ContentLength != -1) {    /* file */
 908                 strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&config->last_mod));
 909                 len += sprintf(buf+len, "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
 910                         timeStr, "Content-length:", config->ContentLength);
 911         }
 912         strcat(buf, "\r\n");
 913         len += 2;
 914         if (infoString) {
 915                 len += sprintf(buf+len,
 916                                 "<HEAD><TITLE>%d %s</TITLE></HEAD>\n"
 917                                 "<BODY><H1>%d %s</H1>\n%s\n</BODY>\n",
 918                                 responseNum, responseString,
 919                                 responseNum, responseString, infoString);
 920         }
 921         if (DEBUG)
 922                 fprintf(stderr, "headers: '%s'\n", buf);
 923         return full_write(config->accepted_socket, buf, len);
 924 }
 925
 926 /****************************************************************************
 927  *
 928  > $Function: getLine()
 929  *
 930  * $Description: Read from the socket until an end of line char found.
 931  *
 932  *   Characters are read one at a time until an eol sequence is found.
 933  *
 934  * $Return: (int) . . . . number of characters read.  -1 if error.
 935  *
 936  ****************************************************************************/
 937 static int getLine(void)
 938 {
 939         int count = 0;
 940         char *buf = config->buf;
 941
 942         while (read(config->accepted_socket, buf + count, 1) == 1) {
 943                 if (buf[count] == '\r') continue;
 944                 if (buf[count] == '\n') {
 945                         buf[count] = 0;
 946                         return count;
 947                 }
 948                 if (count < (MAX_MEMORY_BUFF-1))      /* check overflow */
 949                         count++;
 950         }
 951         if (count) return count;
 952         else return -1;
 953 }
 954
 955 #if ENABLE_FEATURE_HTTPD_CGI
 956 /****************************************************************************
 957  *
 958  > $Function: sendCgi()
 959  *
 960  * $Description: Execute a CGI script and send it's stdout back
 961  *
 962  *   Environment variables are set up and the script is invoked with pipes
 963  *   for stdin/stdout.  If a post is being done the script is fed the POST
 964  *   data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
 965  *
 966  * $Parameters:
 967  *      (const char *) url . . . . . . The requested URL (with leading /).
 968  *      (int bodyLen)  . . . . . . . . Length of the post body.
 969  *      (const char *cookie) . . . . . For set HTTP_COOKIE.
 970  *      (const char *content_type) . . For set CONTENT_TYPE.
 971
 972  *
 973  * $Return: (char *)  . . . . A pointer to the decoded string (same as input).
 974  *
 975  * $Errors: None
 976  *
 977  ****************************************************************************/
 978 static int sendCgi(const char *url,
 979                 const char *request, int bodyLen, const char *cookie,
 980                 const char *content_type)
 981 {
 982         int fromCgi[2];  /* pipe for reading data from CGI */
 983         int toCgi[2];    /* pipe for sending data to CGI */
 984
 985         static char * argp[] = { 0, 0 };
 986         int pid = 0;
 987         int inFd;
 988         int outFd;
 989         int firstLine = 1;
 990         int status;
 991         size_t post_readed_size, post_readed_idx;
 992
 993         if (pipe(fromCgi) != 0)
 994                 return 0;
 995         if (pipe(toCgi) != 0)
 996                 return 0;
 997
 998         pid = fork();
 999         if (pid < 0)
1000                 return 0;
1001
1002         if (!pid) {
1003                 /* child process */
1004                 char *script;
1005                 char *purl = strdup(url);
1006                 char realpath_buff[MAXPATHLEN];
1007
1008                 if (purl == NULL)
1009                         _exit(242);
1010
1011                 inFd = toCgi[0];
1012                 outFd = fromCgi[1];
1013
1014                 dup2(inFd, 0);  // replace stdin with the pipe
1015                 dup2(outFd, 1);  // replace stdout with the pipe
1016                 if (!DEBUG)
1017                         dup2(outFd, 2);  // replace stderr with the pipe
1018
1019                 close(toCgi[0]);
1020                 close(toCgi[1]);
1021                 close(fromCgi[0]);
1022                 close(fromCgi[1]);
1023
1024                 close(config->accepted_socket);
1025                 close(config->server_socket);
1026
1027                 /*
1028                  * Find PATH_INFO.
1029                  */
1030                 script = purl;
1031                 while ((script = strchr(script + 1, '/')) != NULL) {
1032                         /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
1033                         struct stat sb;
1034
1035                         *script = '\0';
1036                         if (is_directory(purl + 1, 1, &sb) == 0) {
1037                                 /* not directory, found script.cgi/PATH_INFO */
1038                                 *script = '/';
1039                                 break;
1040                         }
1041                         *script = '/';          /* is directory, find next '/' */
1042                 }
1043                 setenv1("PATH_INFO", script);   /* set /PATH_INFO or "" */
1044                 /* setenv1("PATH", getenv("PATH")); redundant */
1045                 setenv1("REQUEST_METHOD", request);
1046                 if (config->query) {
1047                         char *uri = alloca(strlen(purl) + 2 + strlen(config->query));
1048                         if (uri)
1049                                 sprintf(uri, "%s?%s", purl, config->query);
1050                         setenv1("REQUEST_URI", uri);
1051                 } else {
1052                         setenv1("REQUEST_URI", purl);
1053                 }
1054                 if (script != NULL)
1055                         *script = '\0';         /* cut off /PATH_INFO */
1056                  /* SCRIPT_FILENAME required by PHP in CGI mode */
1057                 if (!realpath(purl + 1, realpath_buff))
1058                         goto error_execing_cgi;
1059                 setenv1("SCRIPT_FILENAME", realpath_buff);
1060                 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1061                 setenv1("SCRIPT_NAME", purl);
1062                 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1063                  * QUERY_STRING: The information which follows the ? in the URL
1064                  * which referenced this script. This is the query information.
1065                  * It should not be decoded in any fashion. This variable
1066                  * should always be set when there is query information,
1067                  * regardless of command line decoding. */
1068                 /* (Older versions of bbox seemed to do some decoding) */
1069                 setenv1("QUERY_STRING", config->query);
1070                 setenv1("SERVER_SOFTWARE", httpdVersion);
1071                 putenv("SERVER_PROTOCOL=HTTP/1.0");
1072                 putenv("GATEWAY_INTERFACE=CGI/1.1");
1073                 setenv1("REMOTE_ADDR", config->rmt_ip_str);
1074 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1075                 setenv_long("REMOTE_PORT", config->port);
1076 #endif
1077                 if (bodyLen)
1078                         setenv_long("CONTENT_LENGTH", bodyLen);
1079                 if (cookie)
1080                         setenv1("HTTP_COOKIE", cookie);
1081                 if (content_type)
1082                         setenv1("CONTENT_TYPE", content_type);
1083 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1084                 if (config->remoteuser) {
1085                         setenv1("REMOTE_USER", config->remoteuser);
1086                         putenv("AUTH_TYPE=Basic");
1087                 }
1088 #endif
1089                 if (config->referer)
1090                         setenv1("HTTP_REFERER", config->referer);
1091
1092                 /* set execve argp[0] without path */
1093                 argp[0] = strrchr(purl, '/') + 1;
1094                 /* but script argp[0] must have absolute path and chdiring to this */
1095                 script = strrchr(realpath_buff, '/');
1096                 if (!script)
1097                         goto error_execing_cgi;
1098                 *script = '\0';
1099                 if (chdir(realpath_buff) == 0) {
1100                         // now run the program.  If it fails,
1101                         // use _exit() so no destructors
1102                         // get called and make a mess.
1103 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1104                         char *interpr = NULL;
1105                         char *suffix = strrchr(purl, '.');
1106
1107                         if (suffix) {
1108                                 Htaccess *cur;
1109                                 for (cur = config->script_i; cur; cur = cur->next) {
1110                                         if (strcmp(cur->before_colon + 1, suffix) == 0) {
1111                                                 interpr = cur->after_colon;
1112                                                 break;
1113                                         }
1114                                 }
1115                         }
1116 #endif
1117                         *script = '/';
1118 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1119                         if (interpr)
1120                                 execv(interpr, argp);
1121                         else
1122 #endif
1123                                 execv(realpath_buff, argp);
1124                 }
1125  error_execing_cgi:
1126                 /* send to stdout (even if we are not from inetd) */
1127                 config->accepted_socket = 1;
1128                 sendHeaders(HTTP_NOT_FOUND);
1129                 _exit(242);
1130         } /* end child */
1131
1132         /* parent process */
1133
1134         post_readed_size = 0;
1135         post_readed_idx = 0;
1136         inFd = fromCgi[0];
1137         outFd = toCgi[1];
1138         close(fromCgi[1]);
1139         close(toCgi[0]);
1140         signal(SIGPIPE, SIG_IGN);
1141
1142         while (1) {
1143                 fd_set readSet;
1144                 fd_set writeSet;
1145                 char wbuf[128];
1146                 int nfound;
1147                 int count;
1148
1149                 FD_ZERO(&readSet);
1150                 FD_ZERO(&writeSet);
1151                 FD_SET(inFd, &readSet);
1152                 if (bodyLen > 0 || post_readed_size > 0) {
1153                         FD_SET(outFd, &writeSet);
1154                         nfound = outFd > inFd ? outFd : inFd;
1155                         if (post_readed_size == 0) {
1156                                 FD_SET(config->accepted_socket, &readSet);
1157                                 if (nfound < config->accepted_socket)
1158                                         nfound = config->accepted_socket;
1159                         }
1160                         /* Now wait on the set of sockets! */
1161                         nfound = select(nfound + 1, &readSet, &writeSet, 0, NULL);
1162                 } else {
1163                         if (!bodyLen) {
1164                                 close(outFd);
1165                                 bodyLen = -1;
1166                         }
1167                         nfound = select(inFd + 1, &readSet, 0, 0, NULL);
1168                 }
1169
1170                 if (nfound <= 0) {
1171                         if (waitpid(pid, &status, WNOHANG) > 0) {
1172                                 close(inFd);
1173                                 if (DEBUG && WIFEXITED(status))
1174                                         bb_error_msg("piped has exited with status=%d", WEXITSTATUS(status));
1175                                 if (DEBUG && WIFSIGNALED(status))
1176                                         bb_error_msg("piped has exited with signal=%d", WTERMSIG(status));
1177                                 break;
1178                         }
1179                 } else if (post_readed_size > 0 && FD_ISSET(outFd, &writeSet)) {
1180                         count = full_write(outFd, wbuf + post_readed_idx, post_readed_size);
1181                         if (count > 0) {
1182                                 post_readed_size -= count;
1183                                 post_readed_idx += count;
1184                                 if (post_readed_size == 0)
1185                                         post_readed_idx = 0;
1186                         } else {
1187                                 post_readed_size = post_readed_idx = bodyLen = 0; /* broken pipe to CGI */
1188                         }
1189                 } else if (bodyLen > 0 && post_readed_size == 0 && FD_ISSET(config->accepted_socket, &readSet)) {
1190                         count = bodyLen > (int)sizeof(wbuf) ? (int)sizeof(wbuf) : bodyLen;
1191                         count = safe_read(config->accepted_socket, wbuf, count);
1192                         if (count > 0) {
1193                                 post_readed_size += count;
1194                                 bodyLen -= count;
1195                         } else {
1196                                 bodyLen = 0;    /* closed */
1197                         }
1198                 }
1199                 if (FD_ISSET(inFd, &readSet)) {
1200                         int s = config->accepted_socket;
1201                         char *rbuf = config->buf;
1202
1203 #ifndef PIPE_BUF
1204 # define PIPESIZE 4096          /* amount of buffering in a pipe */
1205 #else
1206 # define PIPESIZE PIPE_BUF
1207 #endif
1208 #if PIPESIZE >= MAX_MEMORY_BUFF
1209 # error "PIPESIZE >= MAX_MEMORY_BUFF"
1210 #endif
1211
1212                         /* There is something to read */
1213                         count = safe_read(inFd, rbuf, PIPESIZE);
1214                         if (count == 0)
1215                                 break;  /* closed */
1216                         if (count > 0) {
1217                                 if (firstLine) {
1218                                         rbuf[count] = 0;
1219                                         /* check to see if the user script added headers */
1220                                         if (strncmp(rbuf, "HTTP/1.0 200 OK\r\n", 4) != 0) {
1221                                                 full_write(s, "HTTP/1.0 200 OK\r\n", 17);
1222                                         }
1223                                         /* Sometimes CGI is writing to pipe in small chunks
1224                                          * and we don't see Content-type (because the read
1225                                          * is too short) and we emit bogus "text/plain"!
1226                                          * Is it a bug or CGI *has to* write it in one piece? */
1227                                         if (strstr(rbuf, "ontent-") == 0) {
1228                                                 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1229                                         }
1230                                         firstLine = 0;
1231                                 }
1232                                 if (full_write(s, rbuf, count) != count)
1233                                         break;
1234
1235                                 if (DEBUG)
1236                                         fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1237                         }
1238                 }
1239         }
1240         return 0;
1241 }
1242 #endif          /* FEATURE_HTTPD_CGI */
1243
1244 /****************************************************************************
1245  *
1246  > $Function: sendFile()
1247  *
1248  * $Description: Send a file response to a HTTP request
1249  *
1250  * $Parameter:
1251  *      (const char *) url . . The URL requested.
1252  *
1253  * $Return: (int)  . . . . . . Always 0.
1254  *
1255  ****************************************************************************/
1256 static int sendFile(const char *url)
1257 {
1258         char * suffix;
1259         int  f;
1260         const char * const * table;
1261         const char * try_suffix;
1262
1263         suffix = strrchr(url, '.');
1264
1265         for (table = suffixTable; *table; table += 2)
1266                 if (suffix != NULL && (try_suffix = strstr(*table, suffix)) != 0) {
1267                         try_suffix += strlen(suffix);
1268                         if (*try_suffix == 0 || *try_suffix == '.')
1269                                 break;
1270                 }
1271         /* also, if not found, set default as "application/octet-stream";  */
1272         config->found_mime_type = table[1];
1273 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1274         if (suffix) {
1275                 Htaccess * cur;
1276
1277                 for (cur = config->mime_a; cur; cur = cur->next) {
1278                         if (strcmp(cur->before_colon, suffix) == 0) {
1279                                 config->found_mime_type = cur->after_colon;
1280                                 break;
1281                         }
1282                 }
1283         }
1284 #endif  /* FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */
1285
1286         if (DEBUG)
1287                 fprintf(stderr, "sending file '%s' content-type: %s\n",
1288                         url, config->found_mime_type);
1289
1290         f = open(url, O_RDONLY);
1291         if (f >= 0) {
1292                 int count;
1293                 char *buf = config->buf;
1294
1295                 sendHeaders(HTTP_OK);
1296                 /* TODO: sendfile() */
1297                 while ((count = full_read(f, buf, MAX_MEMORY_BUFF)) > 0) {
1298                         if (full_write(config->accepted_socket, buf, count) != count)
1299                                 break;
1300                 }
1301                 close(f);
1302         } else {
1303                 if (DEBUG)
1304                         bb_perror_msg("cannot open '%s'", url);
1305                 sendHeaders(HTTP_NOT_FOUND);
1306         }
1307
1308         return 0;
1309 }
1310
1311 static int checkPermIP(void)
1312 {
1313         Htaccess_IP * cur;
1314
1315         /* This could stand some work */
1316         for (cur = config->ip_a_d; cur; cur = cur->next) {
1317 #if DEBUG
1318                 fprintf(stderr, "checkPermIP: '%s' ? ", config->rmt_ip_str);
1319 #endif
1320                 if (DEBUG)
1321                         fprintf(stderr, "'%u.%u.%u.%u/%u.%u.%u.%u'\n",
1322                                 (unsigned char)(cur->ip >> 24),
1323                                 (unsigned char)(cur->ip >> 16),
1324                                 (unsigned char)(cur->ip >> 8),
1325                                                 cur->ip & 0xff,
1326                                 (unsigned char)(cur->mask >> 24),
1327                                 (unsigned char)(cur->mask >> 16),
1328                                 (unsigned char)(cur->mask >> 8),
1329                                                 cur->mask & 0xff);
1330                 if ((config->rmt_ip & cur->mask) == cur->ip)
1331                         return cur->allow_deny == 'A';   /* Allow/Deny */
1332         }
1333
1334         /* if unconfigured, return 1 - access from all */
1335         return !config->flg_deny_all;
1336 }
1337
1338 /****************************************************************************
1339  *
1340  > $Function: checkPerm()
1341  *
1342  * $Description: Check the permission file for access password protected.
1343  *
1344  *   If config file isn't present, everything is allowed.
1345  *   Entries are of the form you can see example from header source
1346  *
1347  * $Parameters:
1348  *      (const char *) path  . . . . The file path.
1349  *      (const char *) request . . . User information to validate.
1350  *
1351  * $Return: (int)  . . . . . . . . . 1 if request OK, 0 otherwise.
1352  *
1353  ****************************************************************************/
1354
1355 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1356 static int checkPerm(const char *path, const char *request)
1357 {
1358         Htaccess * cur;
1359         const char *p;
1360         const char *p0;
1361
1362         const char *prev = NULL;
1363
1364         /* This could stand some work */
1365         for (cur = config->auth; cur; cur = cur->next) {
1366                 size_t l;
1367
1368                 p0 = cur->before_colon;
1369                 if (prev != NULL && strcmp(prev, p0) != 0)
1370                         continue;       /* find next identical */
1371                 p = cur->after_colon;
1372                 if (DEBUG)
1373                         fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
1374
1375                 l = strlen(p0);
1376                 if (strncmp(p0, path, l) == 0
1377                  && (l == 1 || path[l] == '/' || path[l] == '\0')
1378                 ) {
1379                         char *u;
1380                         /* path match found.  Check request */
1381                         /* for check next /path:user:password */
1382                         prev = p0;
1383                         u = strchr(request, ':');
1384                         if (u == NULL) {
1385                                 /* bad request, ':' required */
1386                                 break;
1387                         }
1388
1389                         if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1390                                 char *cipher;
1391                                 char *pp;
1392
1393                                 if (strncmp(p, request, u-request) != 0) {
1394                                         /* user uncompared */
1395                                         continue;
1396                                 }
1397                                 pp = strchr(p, ':');
1398                                 if (pp && pp[1] == '$' && pp[2] == '1' &&
1399                                                 pp[3] == '$' && pp[4]) {
1400                                         pp++;
1401                                         cipher = pw_encrypt(u+1, pp);
1402                                         if (strcmp(cipher, pp) == 0)
1403                                                 goto set_remoteuser_var;   /* Ok */
1404                                         /* unauthorized */
1405                                         continue;
1406                                 }
1407                         }
1408
1409                         if (strcmp(p, request) == 0) {
1410 set_remoteuser_var:
1411                                 config->remoteuser = strdup(request);
1412                                 if (config->remoteuser)
1413                                         config->remoteuser[(u - request)] = 0;
1414                                 return 1;   /* Ok */
1415                         }
1416                         /* unauthorized */
1417                 }
1418         }   /* for */
1419
1420         return prev == NULL;
1421 }
1422
1423 #endif  /* FEATURE_HTTPD_BASIC_AUTH */
1424
1425 /****************************************************************************
1426  *
1427  > $Function: handle_sigalrm()
1428  *
1429  * $Description: Handle timeouts
1430  *
1431  ****************************************************************************/
1432
1433 static void handle_sigalrm(int sig)
1434 {
1435         sendHeaders(HTTP_REQUEST_TIMEOUT);
1436         config->alarm_signaled = sig;
1437 }
1438
1439 /****************************************************************************
1440  *
1441  > $Function: handleIncoming()
1442  *
1443  * $Description: Handle an incoming http request.
1444  *
1445  ****************************************************************************/
1446 static void handleIncoming(void)
1447 {
1448         char *buf = config->buf;
1449         char *url;
1450         char *purl;
1451         int  blank = -1;
1452         char *test;
1453         struct stat sb;
1454         int ip_allowed;
1455 #if ENABLE_FEATURE_HTTPD_CGI
1456         const char *prequest = request_GET;
1457         unsigned long length = 0;
1458         char *cookie = 0;
1459         char *content_type = 0;
1460 #endif
1461         fd_set s_fd;
1462         struct timeval tv;
1463         int retval;
1464         struct sigaction sa;
1465
1466 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1467         int credentials = -1;  /* if not required this is Ok */
1468 #endif
1469
1470         sa.sa_handler = handle_sigalrm;
1471         sigemptyset(&sa.sa_mask);
1472         sa.sa_flags = 0; /* no SA_RESTART */
1473         sigaction(SIGALRM, &sa, NULL);
1474
1475         do {
1476                 int count;
1477
1478                 (void) alarm(TIMEOUT);
1479                 if (getLine() <= 0)
1480                         break;  /* closed */
1481
1482                 purl = strpbrk(buf, " \t");
1483                 if (purl == NULL) {
1484  BAD_REQUEST:
1485                         sendHeaders(HTTP_BAD_REQUEST);
1486                         break;
1487                 }
1488                 *purl = '\0';
1489 #if ENABLE_FEATURE_HTTPD_CGI
1490                 if (strcasecmp(buf, prequest) != 0) {
1491                         prequest = "POST";
1492                         if (strcasecmp(buf, prequest) != 0) {
1493                                 sendHeaders(HTTP_NOT_IMPLEMENTED);
1494                                 break;
1495                         }
1496                 }
1497 #else
1498                 if (strcasecmp(buf, request_GET) != 0) {
1499                         sendHeaders(HTTP_NOT_IMPLEMENTED);
1500                         break;
1501                 }
1502 #endif
1503                 *purl = ' ';
1504                 count = sscanf(purl, " %[^ ] HTTP/%d.%*d", buf, &blank);
1505
1506                 if (count < 1 || buf[0] != '/') {
1507                         /* Garbled request/URL */
1508                         goto BAD_REQUEST;
1509                 }
1510                 url = alloca(strlen(buf) + sizeof("/index.html"));
1511                 if (url == NULL) {
1512                         sendHeaders(HTTP_INTERNAL_SERVER_ERROR);
1513                         break;
1514                 }
1515                 strcpy(url, buf);
1516                 /* extract url args if present */
1517                 test = strchr(url, '?');
1518                 config->query = NULL;
1519                 if (test) {
1520                         *test++ = '\0';
1521                         config->query = test;
1522                 }
1523
1524                 test = decodeString(url, 0);
1525                 if (test == NULL)
1526                         goto BAD_REQUEST;
1527                 if (test == url+1) {
1528                         /* '/' or NUL is encoded */
1529                         sendHeaders(HTTP_NOT_FOUND);
1530                         break;
1531                 }
1532
1533                 /* algorithm stolen from libbb bb_simplify_path(),
1534                          but don't strdup and reducing trailing slash and protect out root */
1535                 purl = test = url;
1536                 do {
1537                         if (*purl == '/') {
1538                                 /* skip duplicate (or initial) slash */
1539                                 if (*test == '/') {
1540                                         continue;
1541                                 }
1542                                 if (*test == '.') {
1543                                         /* skip extra '.' */
1544                                         if (test[1] == '/' || test[1] == 0) {
1545                                                 continue;
1546                                         } else
1547                                         /* '..': be careful */
1548                                         if (test[1] == '.' && (test[2] == '/' || test[2] == 0)) {
1549                                                 ++test;
1550                                                 if (purl == url) {
1551                                                         /* protect out root */
1552                                                         goto BAD_REQUEST;
1553                                                 }
1554                                                 while (*--purl != '/') /* omit previous dir */;
1555                                                 continue;
1556                                         }
1557                                 }
1558                         }
1559                         *++purl = *test;
1560                 } while (*++test);
1561                 *++purl = '\0';       /* so keep last character */
1562                 test = purl;          /* end ptr */
1563
1564                 /* If URL is directory, adding '/' */
1565                 if (test[-1] != '/') {
1566                         if (is_directory(url + 1, 1, &sb)) {
1567                                 config->found_moved_temporarily = url;
1568                         }
1569                 }
1570                 if (DEBUG)
1571                         fprintf(stderr, "url='%s', args=%s\n", url, config->query);
1572
1573                 test = url;
1574                 ip_allowed = checkPermIP();
1575                 while (ip_allowed && (test = strchr(test + 1, '/')) != NULL) {
1576                         /* have path1/path2 */
1577                         *test = '\0';
1578                         if (is_directory(url + 1, 1, &sb)) {
1579                                 /* may be having subdir config */
1580                                 parse_conf(url + 1, SUBDIR_PARSE);
1581                                 ip_allowed = checkPermIP();
1582                         }
1583                         *test = '/';
1584                 }
1585                 if (blank >= 0) {
1586                         /* read until blank line for HTTP version specified, else parse immediate */
1587                         while (1) {
1588                                 alarm(TIMEOUT);
1589                                 count = getLine();
1590                                 if (count <= 0)
1591                                         break;
1592
1593                                 if (DEBUG)
1594                                         fprintf(stderr, "header: '%s'\n", buf);
1595
1596 #if ENABLE_FEATURE_HTTPD_CGI
1597                                 /* try and do our best to parse more lines */
1598                                 if ((STRNCASECMP(buf, "Content-length:") == 0)) {
1599                                         /* extra read only for POST */
1600                                         if (prequest != request_GET) {
1601                                                 test = buf + sizeof("Content-length:")-1;
1602                                                 if (!test[0])
1603                                                         goto bail_out;
1604                                                 errno = 0;
1605                                                 /* not using strtoul: it ignores leading munis! */
1606                                                 length = strtol(test, &test, 10);
1607                                                 /* length is "ulong", but we need to pass it to int later */
1608                                                 /* so we check for negative or too large values in one go: */
1609                                                 /* (long -> ulong conv caused negatives to be seen as > INT_MAX) */
1610                                                 if (test[0] || errno || length > INT_MAX)
1611                                                         goto bail_out;
1612                                         }
1613                                 } else if ((STRNCASECMP(buf, "Cookie:") == 0)) {
1614                                         cookie = strdup(skip_whitespace(buf + sizeof("Cookie:")-1));
1615                                 } else if ((STRNCASECMP(buf, "Content-Type:") == 0)) {
1616                                         content_type = strdup(skip_whitespace(buf + sizeof("Content-Type:")-1));
1617                                 } else if ((STRNCASECMP(buf, "Referer:") == 0)) {
1618                                         config->referer = strdup(skip_whitespace(buf + sizeof("Referer:")-1));
1619                                 }
1620 #endif
1621
1622 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1623                                 if (STRNCASECMP(buf, "Authorization:") == 0) {
1624                                         /* We only allow Basic credentials.
1625                                          * It shows up as "Authorization: Basic <userid:password>" where
1626                                          * the userid:password is base64 encoded.
1627                                          */
1628                                         test = skip_whitespace(buf + sizeof("Authorization:")-1);
1629                                         if (STRNCASECMP(test, "Basic") != 0)
1630                                                 continue;
1631                                         test += sizeof("Basic")-1;
1632                                         /* decodeBase64() skips whitespace itself */
1633                                         decodeBase64(test);
1634                                         credentials = checkPerm(url, test);
1635                                 }
1636 #endif          /* FEATURE_HTTPD_BASIC_AUTH */
1637
1638                         } /* while extra header reading */
1639                 }
1640                 alarm(0);
1641                 if (config->alarm_signaled)
1642                         break;
1643
1644                 if (strcmp(strrchr(url, '/') + 1, httpd_conf) == 0 || ip_allowed == 0) {
1645                         /* protect listing [/path]/httpd_conf or IP deny */
1646 #if ENABLE_FEATURE_HTTPD_CGI
1647  FORBIDDEN:             /* protect listing /cgi-bin */
1648 #endif
1649                         sendHeaders(HTTP_FORBIDDEN);
1650                         break;
1651                 }
1652
1653 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1654                 if (credentials <= 0 && checkPerm(url, ":") == 0) {
1655                         sendHeaders(HTTP_UNAUTHORIZED);
1656                         break;
1657                 }
1658 #endif
1659
1660                 if (config->found_moved_temporarily) {
1661                         sendHeaders(HTTP_MOVED_TEMPORARILY);
1662                         /* clear unforked memory flag */
1663                         config->found_moved_temporarily = NULL;
1664                         break;
1665                 }
1666
1667                 test = url + 1;      /* skip first '/' */
1668
1669 #if ENABLE_FEATURE_HTTPD_CGI
1670                 if (strncmp(test, "cgi-bin", 7) == 0) {
1671                         if (test[7] == '/' && test[8] == 0)
1672                                 goto FORBIDDEN;     /* protect listing cgi-bin/ */
1673                         sendCgi(url, prequest, length, cookie, content_type);
1674                         break;
1675                 }
1676                 if (prequest != request_GET) {
1677                         sendHeaders(HTTP_NOT_IMPLEMENTED);
1678                         break;
1679                 }
1680 #endif  /* FEATURE_HTTPD_CGI */
1681                 if (purl[-1] == '/')
1682                         strcpy(purl, "index.html");
1683                 if (stat(test, &sb) == 0) {
1684                         /* It's a dir URL and there is index.html */
1685                         config->ContentLength = sb.st_size;
1686                         config->last_mod = sb.st_mtime;
1687                 }
1688 #if ENABLE_FEATURE_HTTPD_CGI
1689                 else if (purl[-1] == '/') {
1690                         /* It's a dir URL and there is no index.html
1691                          * Try cgi-bin/index.cgi */
1692                         if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
1693                                 purl[0] = '\0';
1694                                 config->query = url;
1695                                 sendCgi("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
1696                                 break;
1697                         }
1698                 }
1699 #endif  /* FEATURE_HTTPD_CGI */
1700                 sendFile(test);
1701                 config->ContentLength = -1;
1702         } while (0);
1703
1704 #if ENABLE_FEATURE_HTTPD_CGI
1705  bail_out:
1706 #endif
1707
1708         if (DEBUG)
1709                 fprintf(stderr, "closing socket\n\n");
1710 #if ENABLE_FEATURE_HTTPD_CGI
1711         free(cookie);
1712         free(content_type);
1713         free(config->referer);
1714         config->referer = NULL;
1715 # if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1716         free(config->remoteuser);
1717         config->remoteuser = NULL;
1718 # endif
1719 #endif
1720         shutdown(config->accepted_socket, SHUT_WR);
1721
1722         /* Properly wait for remote to closed */
1723         FD_ZERO(&s_fd);
1724         FD_SET(config->accepted_socket, &s_fd);
1725
1726         do {
1727                 tv.tv_sec = 2;
1728                 tv.tv_usec = 0;
1729                 retval = select(config->accepted_socket + 1, &s_fd, NULL, NULL, &tv);
1730         } while (retval > 0 && read(config->accepted_socket, buf, sizeof(config->buf) > 0));
1731
1732         shutdown(config->accepted_socket, SHUT_RD);
1733         /* In inetd case, we close fd 1 (stdout) here. We will exit soon anyway */
1734         close(config->accepted_socket);
1735 }
1736
1737 /****************************************************************************
1738  *
1739  > $Function: miniHttpd()
1740  *
1741  * $Description: The main http server function.
1742  *
1743  *   Given an open socket fildes, listen for new connections and farm out
1744  *   the processing as a forked process.
1745  *
1746  * $Parameters:
1747  *      (int) server. . . The server socket fildes.
1748  *
1749  * $Return: (int) . . . . Always 0.
1750  *
1751  ****************************************************************************/
1752 static int miniHttpd(int server)
1753 {
1754         fd_set readfd, portfd;
1755
1756         FD_ZERO(&portfd);
1757         FD_SET(server, &portfd);
1758
1759         /* copy the ports we are watching to the readfd set */
1760         while (1) {
1761                 int on, s;
1762                 socklen_t fromAddrLen;
1763                 struct sockaddr_in fromAddr;
1764
1765                 /* Now wait INDEFINITELY on the set of sockets! */
1766                 readfd = portfd;
1767                 if (select(server + 1, &readfd, 0, 0, 0) <= 0)
1768                         continue;
1769                 if (!FD_ISSET(server, &readfd))
1770                         continue;
1771                 fromAddrLen = sizeof(fromAddr);
1772                 s = accept(server, (struct sockaddr *)&fromAddr, &fromAddrLen);
1773                 if (s < 0)
1774                         continue;
1775                 config->accepted_socket = s;
1776                 config->rmt_ip = ntohl(fromAddr.sin_addr.s_addr);
1777 #if ENABLE_FEATURE_HTTPD_CGI || DEBUG
1778                 sprintf(config->rmt_ip_str, "%u.%u.%u.%u",
1779                                 (unsigned char)(config->rmt_ip >> 24),
1780                                 (unsigned char)(config->rmt_ip >> 16),
1781                                 (unsigned char)(config->rmt_ip >> 8),
1782                                 config->rmt_ip & 0xff);
1783                 config->port = ntohs(fromAddr.sin_port);
1784 #if DEBUG
1785                 bb_error_msg("connection from IP=%s, port %u",
1786                                 config->rmt_ip_str, config->port);
1787 #endif
1788 #endif /* FEATURE_HTTPD_CGI */
1789
1790                 /* set the KEEPALIVE option to cull dead connections */
1791                 on = 1;
1792                 setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, sizeof(on));
1793
1794                 if (DEBUG || fork() == 0) {
1795                         /* child */
1796 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1797                         /* protect reload config, may be confuse checking */
1798                         signal(SIGHUP, SIG_IGN);
1799 #endif
1800                         handleIncoming();
1801                         if (!DEBUG)
1802                                 exit(0);
1803                 }
1804                 close(s);
1805         } /* while (1) */
1806         return 0;
1807 }
1808
1809 /* from inetd */
1810 static int miniHttpd_inetd(void)
1811 {
1812         struct sockaddr_in fromAddrLen;
1813         socklen_t sinlen = sizeof(struct sockaddr_in);
1814
1815         getpeername(0, (struct sockaddr *)&fromAddrLen, &sinlen);
1816         config->rmt_ip = ntohl(fromAddrLen.sin_addr.s_addr);
1817 #if ENABLE_FEATURE_HTTPD_CGI
1818         sprintf(config->rmt_ip_str, "%u.%u.%u.%u",
1819                                 (unsigned char)(config->rmt_ip >> 24),
1820                                 (unsigned char)(config->rmt_ip >> 16),
1821                                 (unsigned char)(config->rmt_ip >> 8),
1822                                                 config->rmt_ip & 0xff);
1823 #endif
1824         config->port = ntohs(fromAddrLen.sin_port);
1825         handleIncoming();
1826         return 0;
1827 }
1828
1829 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1830 static void sighup_handler(int sig)
1831 {
1832         /* set and reset */
1833         struct sigaction sa;
1834
1835         parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
1836         sa.sa_handler = sighup_handler;
1837         sigemptyset(&sa.sa_mask);
1838         sa.sa_flags = SA_RESTART;
1839         sigaction(SIGHUP, &sa, NULL);
1840 }
1841 #endif
1842
1843 enum {
1844         c_opt_config_file = 0,
1845         d_opt_decode_url,
1846         h_opt_home_httpd,
1847         USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
1848         USE_FEATURE_HTTPD_BASIC_AUTH(    r_opt_realm     ,)
1849         USE_FEATURE_HTTPD_AUTH_MD5(      m_opt_md5       ,)
1850         USE_FEATURE_HTTPD_SETUID(        u_opt_setuid    ,)
1851         p_opt_port      ,
1852         p_opt_inetd     ,
1853         p_opt_foreground,
1854         OPT_CONFIG_FILE = 1 << c_opt_config_file,
1855         OPT_DECODE_URL  = 1 << d_opt_decode_url,
1856         OPT_HOME_HTTPD  = 1 << h_opt_home_httpd,
1857         OPT_ENCODE_URL  = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
1858         OPT_REALM       = USE_FEATURE_HTTPD_BASIC_AUTH(    (1 << r_opt_realm     )) + 0,
1859         OPT_MD5         = USE_FEATURE_HTTPD_AUTH_MD5(      (1 << m_opt_md5       )) + 0,
1860         OPT_SETUID      = USE_FEATURE_HTTPD_SETUID(        (1 << u_opt_setuid    )) + 0,
1861         OPT_PORT        = 1 << p_opt_port,
1862         OPT_INETD       = 1 << p_opt_inetd,
1863         OPT_FOREGROUND  = 1 << p_opt_foreground,
1864 };
1865
1866 static const char httpd_opts[] = "c:d:h:"
1867         USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
1868         USE_FEATURE_HTTPD_BASIC_AUTH("r:")
1869         USE_FEATURE_HTTPD_AUTH_MD5("m:")
1870         USE_FEATURE_HTTPD_SETUID("u:")
1871         "p:if";
1872
1873
1874 int httpd_main(int argc, char *argv[])
1875 {
1876         unsigned opt;
1877         const char *home_httpd = home;
1878         char *url_for_decode;
1879         USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
1880         const char *s_port;
1881         USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
1882         USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
1883         USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
1884
1885 #if ENABLE_LOCALE_SUPPORT
1886         /* Undo busybox.c: we want to speak English in http (dates etc) */
1887         setlocale(LC_TIME, "C");
1888 #endif
1889
1890         config = xzalloc(sizeof(*config));
1891 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1892         config->realm = "Web Server Authentication";
1893 #endif
1894         config->port = 80;
1895         config->ContentLength = -1;
1896
1897         opt = getopt32(argc, argv, httpd_opts,
1898                         &(config->configFile), &url_for_decode, &home_httpd
1899                         USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
1900                         USE_FEATURE_HTTPD_BASIC_AUTH(, &(config->realm))
1901                         USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
1902                         USE_FEATURE_HTTPD_SETUID(, &s_ugid)
1903                         , &s_port
1904                 );
1905         if (opt & OPT_DECODE_URL) {
1906                 printf("%s", decodeString(url_for_decode, 1));
1907                 return 0;
1908         }
1909 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
1910         if (opt & OPT_ENCODE_URL) {
1911                 printf("%s", encodeString(url_for_encode));
1912                 return 0;
1913         }
1914 #endif
1915 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
1916         if (opt & OPT_MD5) {
1917                 puts(pw_encrypt(pass, "$1$"));
1918                 return 0;
1919         }
1920 #endif
1921         if (opt & OPT_PORT)
1922                 config->port = xatou16(s_port);
1923
1924 #if ENABLE_FEATURE_HTTPD_SETUID
1925         if (opt & OPT_SETUID) {
1926                 if (!get_uidgid(&ugid, s_ugid, 1))
1927                         bb_error_msg_and_die("unrecognized user[:group] "
1928                                                 "name '%s'", s_ugid);
1929         }
1930 #endif
1931
1932         xchdir(home_httpd);
1933         if (!(opt & OPT_INETD)) {
1934                 config->server_socket = openServer();
1935 #if ENABLE_FEATURE_HTTPD_SETUID
1936                 /* drop privileges */
1937                 if (opt & OPT_SETUID) {
1938                         if (ugid.gid != (gid_t)-1) {
1939                                 if (setgroups(1, &ugid.gid) == -1)
1940                                         bb_perror_msg_and_die("setgroups");
1941                                 xsetgid(ugid.gid);
1942                         }
1943                         xsetuid(ugid.uid);
1944                 }
1945 #endif
1946         }
1947
1948 #if ENABLE_FEATURE_HTTPD_CGI
1949         {
1950                 char *p = getenv("PATH");
1951                 p = xstrdup(p); /* if gets NULL, returns NULL */
1952                 clearenv();
1953                 if (p)
1954                         setenv1("PATH", p);
1955                 if (!(opt & OPT_INETD))
1956                         setenv_long("SERVER_PORT", config->port);
1957         }
1958 #endif
1959
1960 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1961         sighup_handler(0);
1962 #else
1963         parse_conf(default_path_httpd_conf, FIRST_PARSE);
1964 #endif
1965
1966         if (opt & OPT_INETD)
1967                 return miniHttpd_inetd();
1968
1969         if (!(opt & OPT_FOREGROUND))
1970                 xdaemon(1, 0);     /* don't change current directory */
1971         return miniHttpd(config->server_socket);
1972 }