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