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