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 "libbb.h"
  95
  96 /* amount of buffering in a pipe */
  97 #ifndef PIPE_BUF
  98 # define PIPE_BUF 4096
  99 #endif
 100
 101 static const char default_path_httpd_conf[] = "/etc";
 102 static const char httpd_conf[] = "httpd.conf";
 103
 104 #define TIMEOUT 60
 105
 106 // Note: busybox xfuncs are not used because we want the server to keep running
 107 //       if something bad happens due to a malformed user request.
 108 //       As a result, all memory allocation after daemonize
 109 //       is checked rigorously
 110
 111 //#define DEBUG 1
 112 #define DEBUG 0
 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 ip;
 124         unsigned mask;
 125         int allow_deny;
 126         struct HT_ACCESS_IP *next;
 127 } Htaccess_IP;
 128
 129 struct globals {
 130         int server_socket;
 131         int accepted_socket;
 132         volatile smallint alarm_signaled;
 133         smallint flg_deny_all;
 134         const char *g_query;
 135         const char *configFile;
 136         const char *home_httpd;
 137         unsigned rmt_ip;
 138
 139         const char *found_mime_type;
 140         const char *found_moved_temporarily;
 141         off_t ContentLength;          /* -1 - unknown */
 142         time_t last_mod;
 143         Htaccess_IP *ip_a_d;          /* config allow/deny lines */
 144
 145         USE_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
 146         USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
 147         USE_FEATURE_HTTPD_CGI(char *referer;)
 148
 149 #if ENABLE_FEATURE_HTTPD_CGI || DEBUG
 150         char *rmt_ip_str;        /* for set env REMOTE_ADDR */
 151 #endif
 152         unsigned tcp_port;       /* server initial port and for
 153                                     set env REMOTE_PORT */
 154 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 155         Htaccess *g_auth;        /* config user:password lines */
 156 #endif
 157 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 158         Htaccess *mime_a;             /* config mime types */
 159 #endif
 160 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 161         Htaccess *script_i;           /* config script interpreters */
 162 #endif
 163         char iobuf[MAX_MEMORY_BUFF];
 164 };
 165 #define G (*ptr_to_globals)
 166 #define server_socket   (G.server_socket  )
 167 #define accepted_socket (G.accepted_socket)
 168 #define alarm_signaled  (G.alarm_signaled )
 169 #define flg_deny_all    (G.flg_deny_all   )
 170 #define g_query         (G.g_query        )
 171 #define configFile      (G.configFile     )
 172 #define home_httpd      (G.home_httpd     )
 173 #define rmt_ip          (G.rmt_ip         )
 174 #define found_mime_type (G.found_mime_type)
 175 #define found_moved_temporarily (G.found_moved_temporarily)
 176 #define ContentLength   (G.ContentLength  )
 177 #define last_mod        (G.last_mod       )
 178 #define ip_a_d          (G.ip_a_d         )
 179 #define g_realm         (G.g_realm        )
 180 #define remoteuser      (G.remoteuser     )
 181 #define referer         (G.referer        )
 182 #if ENABLE_FEATURE_HTTPD_CGI || DEBUG
 183 #define rmt_ip_str      (G.rmt_ip_str     )
 184 #endif
 185 #define tcp_port        (G.tcp_port       )
 186 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 187 #define g_auth          (G.g_auth         )
 188 #endif
 189 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 190 #define mime_a          (G.mime_a         )
 191 #endif
 192 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 193 #define script_i        (G.script_i       )
 194 #endif
 195 #define iobuf           (G.iobuf          )
 196 #define INIT_G() do { \
 197         PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
 198         USE_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
 199         tcp_port = 80; \
 200         ContentLength = -1; \
 201 } while (0)
 202
 203 static const char request_GET[] = "GET";    /* size algorithmic optimize */
 204
 205 static const char* const suffixTable [] = {
 206 /* Warning: shorted equivalent suffix in one line must be first */
 207         ".htm.html", "text/html",
 208         ".jpg.jpeg", "image/jpeg",
 209         ".gif", "image/gif",
 210         ".png", "image/png",
 211         ".txt.h.c.cc.cpp", "text/plain",
 212         ".css", "text/css",
 213         ".wav", "audio/wav",
 214         ".avi", "video/x-msvideo",
 215         ".qt.mov", "video/quicktime",
 216         ".mpe.mpeg", "video/mpeg",
 217         ".mid.midi", "audio/midi",
 218         ".mp3", "audio/mpeg",
 219 #if 0                        /* unpopular */
 220         ".au", "audio/basic",
 221         ".pac", "application/x-ns-proxy-autoconfig",
 222         ".vrml.wrl", "model/vrml",
 223 #endif
 224         0, "application/octet-stream" /* default */
 225 };
 226
 227 typedef enum {
 228         HTTP_OK = 200,
 229         HTTP_MOVED_TEMPORARILY = 302,
 230         HTTP_BAD_REQUEST = 400,       /* malformed syntax */
 231         HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
 232         HTTP_NOT_FOUND = 404,
 233         HTTP_FORBIDDEN = 403,
 234         HTTP_REQUEST_TIMEOUT = 408,
 235         HTTP_NOT_IMPLEMENTED = 501,   /* used for unrecognized requests */
 236         HTTP_INTERNAL_SERVER_ERROR = 500,
 237 #if 0 /* future use */
 238         HTTP_CONTINUE = 100,
 239         HTTP_SWITCHING_PROTOCOLS = 101,
 240         HTTP_CREATED = 201,
 241         HTTP_ACCEPTED = 202,
 242         HTTP_NON_AUTHORITATIVE_INFO = 203,
 243         HTTP_NO_CONTENT = 204,
 244         HTTP_MULTIPLE_CHOICES = 300,
 245         HTTP_MOVED_PERMANENTLY = 301,
 246         HTTP_NOT_MODIFIED = 304,
 247         HTTP_PAYMENT_REQUIRED = 402,
 248         HTTP_BAD_GATEWAY = 502,
 249         HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
 250         HTTP_RESPONSE_SETSIZE = 0xffffffff
 251 #endif
 252 } HttpResponseNum;
 253
 254 typedef struct {
 255         HttpResponseNum type;
 256         const char *name;
 257         const char *info;
 258 } HttpEnumString;
 259
 260 static const HttpEnumString httpResponseNames[] = {
 261         { HTTP_OK, "OK", NULL },
 262         { HTTP_MOVED_TEMPORARILY, "Found", "Directories must end with a slash." },
 263         { HTTP_REQUEST_TIMEOUT, "Request Timeout",
 264                 "No request appeared within a reasonable time period." },
 265         { HTTP_NOT_IMPLEMENTED, "Not Implemented",
 266                 "The requested method is not recognized by this server." },
 267 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 268         { HTTP_UNAUTHORIZED, "Unauthorized", "" },
 269 #endif
 270         { HTTP_NOT_FOUND, "Not Found",
 271                 "The requested URL was not found on this server." },
 272         { HTTP_BAD_REQUEST, "Bad Request", "Unsupported method." },
 273         { HTTP_FORBIDDEN, "Forbidden", "" },
 274         { HTTP_INTERNAL_SERVER_ERROR, "Internal Server Error",
 275                 "Internal Server Error" },
 276 #if 0                               /* not implemented */
 277         { HTTP_CREATED, "Created" },
 278         { HTTP_ACCEPTED, "Accepted" },
 279         { HTTP_NO_CONTENT, "No Content" },
 280         { HTTP_MULTIPLE_CHOICES, "Multiple Choices" },
 281         { HTTP_MOVED_PERMANENTLY, "Moved Permanently" },
 282         { HTTP_NOT_MODIFIED, "Not Modified" },
 283         { HTTP_BAD_GATEWAY, "Bad Gateway", "" },
 284         { HTTP_SERVICE_UNAVAILABLE, "Service Unavailable", "" },
 285 #endif
 286 };
 287
 288
 289 static const char RFC1123FMT[] = "%a, %d %b %Y %H:%M:%S GMT";
 290
 291
 292 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
 293
 294
 295 static int scan_ip(const char **ep, unsigned *ip, unsigned char endc)
 296 {
 297         const char *p = *ep;
 298         int auto_mask = 8;
 299         int j;
 300
 301         *ip = 0;
 302         for (j = 0; j < 4; j++) {
 303                 unsigned octet;
 304
 305                 if ((*p < '0' || *p > '9') && (*p != '/' || j == 0) && *p != 0)
 306                         return -auto_mask;
 307                 octet = 0;
 308                 while (*p >= '0' && *p <= '9') {
 309                         octet *= 10;
 310                         octet += *p - '0';
 311                         if (octet > 255)
 312                                 return -auto_mask;
 313                         p++;
 314                 }
 315                 if (*p == '.')
 316                         p++;
 317                 if (*p != '/' && *p != 0)
 318                         auto_mask += 8;
 319                 *ip = ((*ip) << 8) | octet;
 320         }
 321         if (*p != 0) {
 322                 if (*p != endc)
 323                         return -auto_mask;
 324                 p++;
 325                 if (*p == 0)
 326                         return -auto_mask;
 327         }
 328         *ep = p;
 329         return auto_mask;
 330 }
 331
 332 static int scan_ip_mask(const char *ipm, unsigned *ip, unsigned *mask)
 333 {
 334         int i;
 335         unsigned msk;
 336
 337         i = scan_ip(&ipm, ip, '/');
 338         if (i < 0)
 339                 return i;
 340         if (*ipm) {
 341                 const char *p = ipm;
 342
 343                 i = 0;
 344                 while (*p) {
 345                         if (*p < '0' || *p > '9') {
 346                                 if (*p == '.') {
 347                                         i = scan_ip(&ipm, mask, 0);
 348                                         return i != 32;
 349                                 }
 350                                 return -1;
 351                         }
 352                         i *= 10;
 353                         i += *p - '0';
 354                         p++;
 355                 }
 356         }
 357         if (i > 32 || i < 0)
 358                 return -1;
 359         msk = 0x80000000;
 360         *mask = 0;
 361         while (i > 0) {
 362                 *mask |= msk;
 363                 msk >>= 1;
 364                 i--;
 365         }
 366         return 0;
 367 }
 368
 369 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
 370  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
 371  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 372 static void free_config_lines(Htaccess **pprev)
 373 {
 374         Htaccess *prev = *pprev;
 375
 376         while (prev) {
 377                 Htaccess *cur = prev;
 378
 379                 prev = cur->next;
 380                 free(cur);
 381         }
 382         *pprev = NULL;
 383 }
 384 #endif
 385
 386 /* flag */
 387 #define FIRST_PARSE          0
 388 #define SUBDIR_PARSE         1
 389 #define SIGNALED_PARSE       2
 390 #define FIND_FROM_HTTPD_ROOT 3
 391 /****************************************************************************
 392  *
 393  > $Function: parse_conf()
 394  *
 395  * $Description: parse configuration file into in-memory linked list.
 396  *
 397  * The first non-white character is examined to determine if the config line
 398  * is one of the following:
 399  *    .ext:mime/type   # new mime type not compiled into httpd
 400  *    [adAD]:from      # ip address allow/deny, * for wildcard
 401  *    /path:user:pass  # username/password
 402  *
 403  * Any previous IP rules are discarded.
 404  * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
 405  * are also discarded.  That is, previous settings are retained if flag is
 406  * SUBDIR_PARSE.
 407  *
 408  * $Parameters:
 409  *      (const char *) path . . null for ip address checks, path for password
 410  *                              checks.
 411  *      (int) flag  . . . . . . the source of the parse request.
 412  *
 413  * $Return: (None)
 414  *
 415  ****************************************************************************/
 416 static void parse_conf(const char *path, int flag)
 417 {
 418         FILE *f;
 419 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 420         Htaccess *prev;
 421 #endif
 422 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
 423  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
 424  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 425         Htaccess *cur;
 426 #endif
 427
 428         const char *cf = configFile;
 429         char buf[160];
 430         char *p0 = NULL;
 431         char *c, *p;
 432
 433         /* free previous ip setup if present */
 434         Htaccess_IP *pip = ip_a_d;
 435
 436         while (pip) {
 437                 Htaccess_IP *cur_ipl = pip;
 438
 439                 pip = cur_ipl->next;
 440                 free(cur_ipl);
 441         }
 442         ip_a_d = NULL;
 443
 444         flg_deny_all = 0;
 445
 446 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
 447  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
 448  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 449         /* retain previous auth and mime config only for subdir parse */
 450         if (flag != SUBDIR_PARSE) {
 451 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 452                 free_config_lines(&g_auth);
 453 #endif
 454 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 455                 free_config_lines(&mime_a);
 456 #endif
 457 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 458                 free_config_lines(&script_i);
 459 #endif
 460         }
 461 #endif
 462
 463         if (flag == SUBDIR_PARSE || cf == NULL) {
 464                 cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
 465                 if (cf == NULL) {
 466                         if (flag == FIRST_PARSE)
 467                         bb_error_msg_and_die(bb_msg_memory_exhausted);
 468                         return;
 469                 }
 470                 sprintf((char *)cf, "%s/%s", path, httpd_conf);
 471         }
 472
 473         while ((f = fopen(cf, "r")) == NULL) {
 474                 if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
 475                         /* config file not found, no changes to config */
 476                         return;
 477                 }
 478                 if (configFile && flag == FIRST_PARSE) /* if -c option given */
 479                         bb_perror_msg_and_die("%s", cf);
 480                 flag = FIND_FROM_HTTPD_ROOT;
 481                 cf = httpd_conf;
 482         }
 483
 484 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 485         prev = g_auth;
 486 #endif
 487         /* This could stand some work */
 488         while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
 489                 c = NULL;
 490                 for (p = p0; *p0 != 0 && *p0 != '#'; p0++) {
 491                         if (!isspace(*p0)) {
 492                                 *p++ = *p0;
 493                                 if (*p0 == ':' && c == NULL)
 494                                 c = p;
 495                         }
 496                 }
 497                 *p = 0;
 498
 499                 /* test for empty or strange line */
 500                 if (c == NULL || *c == 0)
 501                         continue;
 502                 p0 = buf;
 503                 if (*p0 == 'd')
 504                                 *p0 = 'D';
 505                 if (*c == '*') {
 506                         if (*p0 == 'D') {
 507                                 /* memorize deny all */
 508                                 flg_deny_all = 1;
 509                         }
 510                         /* skip default other "word:*" config lines */
 511                         continue;
 512                 }
 513
 514                 if (*p0 == 'a')
 515                         *p0 = 'A';
 516                 else if (*p0 != 'D' && *p0 != 'A'
 517 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 518                          && *p0 != '/'
 519 #endif
 520 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 521                          && *p0 != '.'
 522 #endif
 523 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 524                          && *p0 != '*'
 525 #endif
 526                         )
 527                          continue;
 528                 if (*p0 == 'A' || *p0 == 'D') {
 529                         /* storing current config IP line */
 530                         pip = xzalloc(sizeof(Htaccess_IP));
 531                         if (pip) {
 532                                 if (scan_ip_mask(c, &(pip->ip), &(pip->mask))) {
 533                                         /* syntax IP{/mask} error detected, protect all */
 534                                         *p0 = 'D';
 535                                         pip->mask = 0;
 536                                 }
 537                                 pip->allow_deny = *p0;
 538                                 if (*p0 == 'D') {
 539                                         /* Deny:form_IP move top */
 540                                         pip->next = ip_a_d;
 541                                         ip_a_d = pip;
 542                                 } else {
 543                                         /* add to bottom A:form_IP config line */
 544                                         Htaccess_IP *prev_IP = ip_a_d;
 545
 546                                         if (prev_IP == NULL) {
 547                                                 ip_a_d = pip;
 548                                         } else {
 549                                                 while (prev_IP->next)
 550                                                         prev_IP = prev_IP->next;
 551                                                 prev_IP->next = pip;
 552                                         }
 553                                 }
 554                         }
 555                         continue;
 556                 }
 557 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 558                 if (*p0 == '/') {
 559                         /* make full path from httpd root / curent_path / config_line_path */
 560                         cf = flag == SUBDIR_PARSE ? path : "";
 561                         p0 = malloc(strlen(cf) + (c - buf) + 2 + strlen(c));
 562                         if (p0 == NULL)
 563                                 continue;
 564                         c[-1] = 0;
 565                         sprintf(p0, "/%s%s", cf, buf);
 566
 567                         /* another call bb_simplify_path */
 568                         cf = p = p0;
 569
 570                         do {
 571                                 if (*p == '/') {
 572                                         if (*cf == '/') {    /* skip duplicate (or initial) slash */
 573                                                 continue;
 574                                         } else if (*cf == '.') {
 575                                                 if (cf[1] == '/' || cf[1] == 0) { /* remove extra '.' */
 576                                                         continue;
 577                                                 } else if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == 0)) {
 578                                                         ++cf;
 579                                                         if (p > p0) {
 580                                                                 while (*--p != '/') /* omit previous dir */;
 581                                                         }
 582                                                         continue;
 583                                                 }
 584                                         }
 585                                 }
 586                                 *++p = *cf;
 587                         } while (*++cf);
 588
 589                         if ((p == p0) || (*p != '/')) {      /* not a trailing slash */
 590                                 ++p;                             /* so keep last character */
 591                         }
 592                         *p = 0;
 593                         sprintf(p0, "%s:%s", p0, c);
 594                 }
 595 #endif
 596
 597 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
 598  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
 599  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 600                 /* storing current config line */
 601                 cur = xzalloc(sizeof(Htaccess) + strlen(p0));
 602                 if (cur) {
 603                         cf = strcpy(cur->before_colon, p0);
 604                         c = strchr(cf, ':');
 605                         *c++ = 0;
 606                         cur->after_colon = c;
 607 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 608                         if (*cf == '.') {
 609                                 /* config .mime line move top for overwrite previous */
 610                                 cur->next = mime_a;
 611                                 mime_a = cur;
 612                                 continue;
 613                         }
 614 #endif
 615 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 616                         if (*cf == '*' && cf[1] == '.') {
 617                                 /* config script interpreter line move top for overwrite previous */
 618                                 cur->next = script_i;
 619                                 script_i = cur;
 620                                 continue;
 621                         }
 622 #endif
 623 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 624                         free(p0);
 625                         if (prev == NULL) {
 626                                 /* first line */
 627                                 g_auth = prev = cur;
 628                         } else {
 629                                 /* sort path, if current lenght eq or bigger then move up */
 630                                 Htaccess *prev_hti = g_auth;
 631                                 size_t l = strlen(cf);
 632                                 Htaccess *hti;
 633
 634                                 for (hti = prev_hti; hti; hti = hti->next) {
 635                                         if (l >= strlen(hti->before_colon)) {
 636                                                 /* insert before hti */
 637                                                 cur->next = hti;
 638                                                 if (prev_hti != hti) {
 639                                                         prev_hti->next = cur;
 640                                                 } else {
 641                                                         /* insert as top */
 642                                                         g_auth = cur;
 643                                                 }
 644                                                 break;
 645                                         }
 646                                         if (prev_hti != hti)
 647                                                 prev_hti = prev_hti->next;
 648                                 }
 649                                 if (!hti) {       /* not inserted, add to bottom */
 650                                         prev->next = cur;
 651                                         prev = cur;
 652                                 }
 653                         }
 654 #endif
 655                 }
 656 #endif
 657          }
 658          fclose(f);
 659 }
 660
 661 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
 662 /****************************************************************************
 663  *
 664  > $Function: encodeString()
 665  *
 666  * $Description: Given a string, html encode special characters.
 667  *   This is used for the -e command line option to provide an easy way
 668  *   for scripts to encode result data without confusing browsers.  The
 669  *   returned string pointer is memory allocated by malloc().
 670  *
 671  * $Parameters:
 672  *      (const char *) string . . The first string to encode.
 673  *
 674  * $Return: (char *) . . . .. . . A pointer to the encoded string.
 675  *
 676  * $Errors: Returns a null string ("") if memory is not available.
 677  *
 678  ****************************************************************************/
 679 static char *encodeString(const char *string)
 680 {
 681         /* take the simple route and encode everything */
 682         /* could possibly scan once to get length.     */
 683         int len = strlen(string);
 684         char *out = xmalloc(len * 6 + 1);
 685         char *p = out;
 686         char ch;
 687
 688         while ((ch = *string++)) {
 689                 // very simple check for what to encode
 690                 if (isalnum(ch)) *p++ = ch;
 691                 else p += sprintf(p, "&#%d;", (unsigned char) ch);
 692         }
 693         *p = '\0';
 694         return out;
 695 }
 696 #endif          /* FEATURE_HTTPD_ENCODE_URL_STR */
 697
 698 /****************************************************************************
 699  *
 700  > $Function: decodeString()
 701  *
 702  * $Description: Given a URL encoded string, convert it to plain ascii.
 703  *   Since decoding always makes strings smaller, the decode is done in-place.
 704  *   Thus, callers should strdup() the argument if they do not want the
 705  *   argument modified.  The return is the original pointer, allowing this
 706  *   function to be easily used as arguments to other functions.
 707  *
 708  * $Parameters:
 709  *      (char *) string . . . The first string to decode.
 710  *      (int)    option_d . . 1 if called for httpd -d
 711  *
 712  * $Return: (char *)  . . . . A pointer to the decoded string (same as input).
 713  *
 714  * $Errors: None
 715  *
 716  ****************************************************************************/
 717 static char *decodeString(char *orig, int option_d)
 718 {
 719         /* note that decoded string is always shorter than original */
 720         char *string = orig;
 721         char *ptr = string;
 722         char c;
 723
 724         while ((c = *ptr++) != '\0') {
 725                 unsigned value1, value2;
 726
 727                 if (option_d && c == '+') {
 728                         *string++ = ' ';
 729                         continue;
 730                 }
 731                 if (c != '%') {
 732                         *string++ = c;
 733                         continue;
 734                 }
 735                 if (sscanf(ptr, "%1X", &value1) != 1
 736                  || sscanf(ptr+1, "%1X", &value2) != 1
 737                 ) {
 738                         if (!option_d)
 739                                 return NULL;
 740                         *string++ = '%';
 741                         continue;
 742                 }
 743                 value1 = value1 * 16 + value2;
 744                 if (!option_d && (value1 == '/' || value1 == '\0')) {
 745                         /* caller takes it as indication of invalid
 746                          * (dangerous wrt exploits) chars */
 747                         return orig + 1;
 748                 }
 749                 *string++ = value1;
 750                 ptr += 2;
 751         }
 752         *string = '\0';
 753         return orig;
 754 }
 755
 756
 757 #if ENABLE_FEATURE_HTTPD_CGI
 758 /****************************************************************************
 759  * setenv helpers
 760  ****************************************************************************/
 761 static void setenv1(const char *name, const char *value)
 762 {
 763         if (!value)
 764                 value = "";
 765         setenv(name, value, 1);
 766 }
 767 static void setenv_long(const char *name, long value)
 768 {
 769         char buf[sizeof(value)*3 + 1];
 770         sprintf(buf, "%ld", value);
 771         setenv(name, buf, 1);
 772 }
 773 #endif
 774
 775 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 776 /****************************************************************************
 777  *
 778  > $Function: decodeBase64()
 779  *
 780  > $Description: Decode a base 64 data stream as per rfc1521.
 781  *    Note that the rfc states that none base64 chars are to be ignored.
 782  *    Since the decode always results in a shorter size than the input, it is
 783  *    OK to pass the input arg as an output arg.
 784  *
 785  * $Parameter:
 786  *      (char *) Data . . . . A pointer to a base64 encoded string.
 787  *                            Where to place the decoded data.
 788  *
 789  * $Return: void
 790  *
 791  * $Errors: None
 792  *
 793  ****************************************************************************/
 794 static void decodeBase64(char *Data)
 795 {
 796         const unsigned char *in = (const unsigned char *)Data;
 797         // The decoded size will be at most 3/4 the size of the encoded
 798         unsigned ch = 0;
 799         int i = 0;
 800
 801         while (*in) {
 802                 int t = *in++;
 803
 804                 if (t >= '0' && t <= '9')
 805                         t = t - '0' + 52;
 806                 else if (t >= 'A' && t <= 'Z')
 807                         t = t - 'A';
 808                 else if (t >= 'a' && t <= 'z')
 809                         t = t - 'a' + 26;
 810                 else if (t == '+')
 811                         t = 62;
 812                 else if (t == '/')
 813                         t = 63;
 814                 else if (t == '=')
 815                         t = 0;
 816                 else
 817                         continue;
 818
 819                 ch = (ch << 6) | t;
 820                 i++;
 821                 if (i == 4) {
 822                         *Data++ = (char) (ch >> 16);
 823                         *Data++ = (char) (ch >> 8);
 824                         *Data++ = (char) ch;
 825                         i = 0;
 826                 }
 827         }
 828         *Data = '\0';
 829 }
 830 #endif
 831
 832
 833 /****************************************************************************
 834  *
 835  > $Function: openServer()
 836  *
 837  * $Description: create a listen server socket on the designated port.
 838  *
 839  * $Return: (int)  . . . A connection socket. -1 for errors.
 840  *
 841  * $Errors: None
 842  *
 843  ****************************************************************************/
 844 static int openServer(void)
 845 {
 846         int fd;
 847
 848         /* create the socket right now */
 849         fd = create_and_bind_stream_or_die(NULL, tcp_port);
 850         xlisten(fd, 9);
 851         return fd;
 852 }
 853
 854 /****************************************************************************
 855  *
 856  > $Function: sendHeaders()
 857  *
 858  * $Description: Create and send HTTP response headers.
 859  *   The arguments are combined and sent as one write operation.  Note that
 860  *   IE will puke big-time if the headers are not sent in one packet and the
 861  *   second packet is delayed for any reason.
 862  *
 863  * $Parameter:
 864  *      (HttpResponseNum) responseNum . . . The result code to send.
 865  *
 866  * $Return: (int)  . . . . writing errors
 867  *
 868  ****************************************************************************/
 869 static int sendHeaders(HttpResponseNum responseNum)
 870 {
 871         char *buf = iobuf;
 872         const char *responseString = "";
 873         const char *infoString = 0;
 874         const char *mime_type;
 875         unsigned i;
 876         time_t timer = time(0);
 877         char timeStr[80];
 878         int len;
 879         enum {
 880                 numNames = sizeof(httpResponseNames) / sizeof(httpResponseNames[0])
 881         };
 882
 883         for (i = 0; i < numNames; i++) {
 884                 if (httpResponseNames[i].type == responseNum) {
 885                         responseString = httpResponseNames[i].name;
 886                         infoString = httpResponseNames[i].info;
 887                         break;
 888                 }
 889         }
 890         /* error message is HTML */
 891         mime_type = responseNum == HTTP_OK ?
 892                                 found_mime_type : "text/html";
 893
 894         /* emit the current date */
 895         strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&timer));
 896         len = sprintf(buf,
 897                         "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
 898                         "Date: %s\r\nConnection: close\r\n",
 899                         responseNum, responseString, mime_type, timeStr);
 900
 901 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 902         if (responseNum == HTTP_UNAUTHORIZED) {
 903                 len += sprintf(buf+len,
 904                                 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
 905                                 g_realm);
 906         }
 907 #endif
 908         if (responseNum == HTTP_MOVED_TEMPORARILY) {
 909                 len += sprintf(buf+len, "Location: %s/%s%s\r\n",
 910                                 found_moved_temporarily,
 911                                 (g_query ? "?" : ""),
 912                                 (g_query ? g_query : ""));
 913         }
 914
 915         if (ContentLength != -1) {    /* file */
 916                 strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&last_mod));
 917                 len += sprintf(buf+len, "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
 918                         timeStr, "Content-length:", ContentLength);
 919         }
 920         strcat(buf, "\r\n");
 921         len += 2;
 922         if (infoString) {
 923                 len += sprintf(buf+len,
 924                                 "<HEAD><TITLE>%d %s</TITLE></HEAD>\n"
 925                                 "<BODY><H1>%d %s</H1>\n%s\n</BODY>\n",
 926                                 responseNum, responseString,
 927                                 responseNum, responseString, infoString);
 928         }
 929         if (DEBUG)
 930                 fprintf(stderr, "headers: '%s'\n", buf);
 931         i = accepted_socket;
 932         if (i == 0) i++; /* write to fd# 1 in inetd mode */
 933         return full_write(i, buf, len);
 934 }
 935
 936 /****************************************************************************
 937  *
 938  > $Function: getLine()
 939  *
 940  * $Description: Read from the socket until an end of line char found.
 941  *
 942  *   Characters are read one at a time until an eol sequence is found.
 943  *
 944  * $Return: (int) . . . . number of characters read.  -1 if error.
 945  *
 946  ****************************************************************************/
 947 static int getLine(void)
 948 {
 949         int count = 0;
 950         char *buf = iobuf;
 951
 952         while (read(accepted_socket, buf + count, 1) == 1) {
 953                 if (buf[count] == '\r') continue;
 954                 if (buf[count] == '\n') {
 955                         buf[count] = 0;
 956                         return count;
 957                 }
 958                 if (count < (MAX_MEMORY_BUFF-1))      /* check overflow */
 959                         count++;
 960         }
 961         if (count) return count;
 962         else return -1;
 963 }
 964
 965 #if ENABLE_FEATURE_HTTPD_CGI
 966 /****************************************************************************
 967  *
 968  > $Function: sendCgi()
 969  *
 970  * $Description: Execute a CGI script and send it's stdout back
 971  *
 972  *   Environment variables are set up and the script is invoked with pipes
 973  *   for stdin/stdout.  If a post is being done the script is fed the POST
 974  *   data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
 975  *
 976  * $Parameters:
 977  *      (const char *) url . . . . . . The requested URL (with leading /).
 978  *      (int bodyLen)  . . . . . . . . Length of the post body.
 979  *      (const char *cookie) . . . . . For set HTTP_COOKIE.
 980  *      (const char *content_type) . . For set CONTENT_TYPE.
 981  *
 982  * $Return: (char *)  . . . . A pointer to the decoded string (same as input).
 983  *
 984  * $Errors: None
 985  *
 986  ****************************************************************************/
 987 static int sendCgi(const char *url,
 988                 const char *request, int bodyLen, const char *cookie,
 989                 const char *content_type)
 990 {
 991         int fromCgi[2];  /* pipe for reading data from CGI */
 992         int toCgi[2];    /* pipe for sending data to CGI */
 993         char *fullpath;
 994         char *argp[] = { NULL, NULL };
 995         int pid = 0;
 996         int inFd;
 997         int outFd;
 998         int buf_count;
 999         int status;
1000         size_t post_read_size, post_read_idx;
1001
1002         if (pipe(fromCgi) != 0)
1003                 return 0;
1004         if (pipe(toCgi) != 0)
1005                 return 0;
1006
1007 /*
1008  * Note: We can use vfork() here in the no-mmu case, although
1009  * the child modifies the parent's variables, due to:
1010  * 1) The parent does not use the child-modified variables.
1011  * 2) The allocated memory (in the child) is freed when the process
1012  *    exits. This happens instantly after the child finishes,
1013  *    since httpd is run from inetd (and it can't run standalone
1014  *    in uClinux).
1015  */
1016
1017 // FIXME: setenv leaks memory! (old values of env vars are leaked)
1018 // Thus we have a bug on NOMMU.
1019 // Need to use this instead:
1020 // [malloc +] putenv + (in child: exec) + (in parent: unsetenv [+ free])
1021
1022 #if !BB_MMU
1023         fullpath = NULL;
1024         pid = vfork();
1025 #else
1026         pid = fork();
1027 #endif
1028         if (pid < 0)
1029                 return 0;
1030
1031         if (!pid) {
1032                 /* child process */
1033                 char *script;
1034                 char *purl;
1035
1036                 if (accepted_socket > 1)
1037                         close(accepted_socket);
1038                 if (server_socket > 1)
1039                         close(server_socket);
1040
1041                 xmove_fd(toCgi[0], 0);  /* replace stdin with the pipe */
1042                 xmove_fd(fromCgi[1], 1);  /* replace stdout with the pipe */
1043                 close(fromCgi[0]);
1044                 close(fromCgi[1]);
1045                 /* Huh? User seeing stderr can be a security problem...
1046                  * and if CGI really wants that, it can always dup2(1,2)...
1047                  * dup2(fromCgi[1], 2); */
1048
1049                 /*
1050                  * Find PATH_INFO.
1051                  */
1052                 xfunc_error_retval = 242;
1053                 purl = xstrdup(url);
1054                 script = purl;
1055                 while ((script = strchr(script + 1, '/')) != NULL) {
1056                         /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
1057                         struct stat sb;
1058
1059                         *script = '\0';
1060                         if (is_directory(purl + 1, 1, &sb) == 0) {
1061                                 /* not directory, found script.cgi/PATH_INFO */
1062                                 *script = '/';
1063                                 break;
1064                         }
1065                         *script = '/';          /* is directory, find next '/' */
1066                 }
1067                 setenv1("PATH_INFO", script);   /* set /PATH_INFO or "" */
1068                 setenv1("REQUEST_METHOD", request);
1069                 if (g_query) {
1070                         char *uri = alloca(strlen(purl) + 2 + strlen(g_query));
1071                         if (uri)
1072                                 sprintf(uri, "%s?%s", purl, g_query);
1073                         setenv1("REQUEST_URI", uri);
1074                 } else {
1075                         setenv1("REQUEST_URI", purl);
1076                 }
1077                 if (script != NULL)
1078                         *script = '\0';         /* cut off /PATH_INFO */
1079
1080                 /* SCRIPT_FILENAME required by PHP in CGI mode */
1081                 fullpath = concat_path_file(home_httpd, purl);
1082                 setenv1("SCRIPT_FILENAME", fullpath);
1083                 /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1084                 setenv1("SCRIPT_NAME", purl);
1085                 /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1086                  * QUERY_STRING: The information which follows the ? in the URL
1087                  * which referenced this script. This is the query information.
1088                  * It should not be decoded in any fashion. This variable
1089                  * should always be set when there is query information,
1090                  * regardless of command line decoding. */
1091                 /* (Older versions of bbox seem to do some decoding) */
1092                 setenv1("QUERY_STRING", g_query);
1093                 putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1094                 putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1095                 putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1096                 /* Having _separate_ variables for IP and port defeats
1097                  * the purpose of having socket abstraction. Which "port"
1098                  * are you using on Unix domain socket?
1099                  * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1100                  * Oh well... */
1101                 {
1102                         char *p = rmt_ip_str ? : (char*)"";
1103                         char *cp = strrchr(p, ':');
1104                         if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1105                                 cp = NULL;
1106                         if (cp) *cp = '\0'; /* delete :PORT */
1107                         setenv1("REMOTE_ADDR", p);
1108                         if (cp) *cp = ':';
1109                 }
1110 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1111                 setenv_long("REMOTE_PORT", tcp_port);
1112 #endif
1113                 if (bodyLen)
1114                         setenv_long("CONTENT_LENGTH", bodyLen);
1115                 if (cookie)
1116                         setenv1("HTTP_COOKIE", cookie);
1117                 if (content_type)
1118                         setenv1("CONTENT_TYPE", content_type);
1119 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1120                 if (remoteuser) {
1121                         setenv1("REMOTE_USER", remoteuser);
1122                         putenv((char*)"AUTH_TYPE=Basic");
1123                 }
1124 #endif
1125                 if (referer)
1126                         setenv1("HTTP_REFERER", referer);
1127
1128                 /* set execve argp[0] without path */
1129                 argp[0] = strrchr(purl, '/') + 1;
1130                 /* but script argp[0] must have absolute path and chdiring to this */
1131                 script = strrchr(fullpath, '/');
1132                 if (!script)
1133                         goto error_execing_cgi;
1134                 *script = '\0';
1135                 if (chdir(fullpath) == 0) {
1136                         // Now run the program.  If it fails,
1137                         // use _exit() so no destructors
1138                         // get called and make a mess.
1139 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1140                         char *interpr = NULL;
1141                         char *suffix = strrchr(purl, '.');
1142
1143                         if (suffix) {
1144                                 Htaccess *cur;
1145                                 for (cur = script_i; cur; cur = cur->next) {
1146                                         if (strcmp(cur->before_colon + 1, suffix) == 0) {
1147                                                 interpr = cur->after_colon;
1148                                                 break;
1149                                         }
1150                                 }
1151                         }
1152 #endif
1153                         *script = '/';
1154 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1155                         if (interpr)
1156                                 execv(interpr, argp);
1157                         else
1158 #endif
1159                                 execv(fullpath, argp);
1160                 }
1161  error_execing_cgi:
1162                 /* send to stdout (even if we are not from inetd) */
1163                 accepted_socket = 1;
1164                 sendHeaders(HTTP_NOT_FOUND);
1165                 _exit(242);
1166         } /* end child */
1167
1168         /* parent process */
1169 #if !BB_MMU
1170         free(fullpath);
1171 #endif
1172
1173         buf_count = 0;
1174         post_read_size = 0;
1175         post_read_idx = 0; /* for gcc */
1176         inFd = fromCgi[0];
1177         outFd = toCgi[1];
1178         close(fromCgi[1]);
1179         close(toCgi[0]);
1180         signal(SIGPIPE, SIG_IGN);
1181
1182         while (1) {
1183                 fd_set readSet;
1184                 fd_set writeSet;
1185                 char wbuf[128];
1186                 int nfound;
1187                 int count;
1188
1189                 FD_ZERO(&readSet);
1190                 FD_ZERO(&writeSet);
1191                 FD_SET(inFd, &readSet);
1192                 if (bodyLen > 0 || post_read_size > 0) {
1193                         FD_SET(outFd, &writeSet);
1194                         nfound = outFd > inFd ? outFd : inFd;
1195                         if (post_read_size == 0) {
1196                                 FD_SET(accepted_socket, &readSet);
1197                                 if (nfound < accepted_socket)
1198                                         nfound = accepted_socket;
1199                         }
1200                         /* Now wait on the set of sockets! */
1201                         nfound = select(nfound + 1, &readSet, &writeSet, NULL, NULL);
1202                 } else {
1203                         if (!bodyLen) {
1204                                 close(outFd); /* no more POST data to CGI */
1205                                 bodyLen = -1;
1206                         }
1207                         nfound = select(inFd + 1, &readSet, NULL, NULL, NULL);
1208                 }
1209
1210                 if (nfound <= 0) {
1211                         if (waitpid(pid, &status, WNOHANG) <= 0) {
1212                                 /* Weird. CGI didn't exit and no fd's
1213                                  * are ready, yet select returned?! */
1214                                 continue;
1215                         }
1216                         close(inFd);
1217                         if (DEBUG && WIFEXITED(status))
1218                                 bb_error_msg("piped has exited with status=%d", WEXITSTATUS(status));
1219                         if (DEBUG && WIFSIGNALED(status))
1220                                 bb_error_msg("piped has exited with signal=%d", WTERMSIG(status));
1221                         break;
1222                 }
1223
1224                 if (post_read_size > 0 && FD_ISSET(outFd, &writeSet)) {
1225                         /* Have data from peer and can write to CGI */
1226                 // huh? why full_write? what if we will block?
1227                 // (imagine that CGI does not read its stdin...)
1228                         count = full_write(outFd, wbuf + post_read_idx, post_read_size);
1229                         if (count > 0) {
1230                                 post_read_idx += count;
1231                                 post_read_size -= count;
1232                         } else {
1233                                 post_read_size = bodyLen = 0; /* broken pipe to CGI */
1234                         }
1235                 } else if (bodyLen > 0 && post_read_size == 0
1236                  && FD_ISSET(accepted_socket, &readSet)
1237                 ) {
1238                         /* We expect data, prev data portion is eaten by CGI
1239                          * and there *is* data to read from the peer
1240                          * (POSTDATA?) */
1241                         count = bodyLen > (int)sizeof(wbuf) ? (int)sizeof(wbuf) : bodyLen;
1242                         count = safe_read(accepted_socket, wbuf, count);
1243                         if (count > 0) {
1244                                 post_read_size = count;
1245                                 post_read_idx = 0;
1246                                 bodyLen -= count;
1247                         } else {
1248                                 bodyLen = 0;    /* closed */
1249                         }
1250                 }
1251
1252 #define PIPESIZE PIPE_BUF
1253 #if PIPESIZE >= MAX_MEMORY_BUFF
1254 # error "PIPESIZE >= MAX_MEMORY_BUFF"
1255 #endif
1256                 if (FD_ISSET(inFd, &readSet)) {
1257                         /* There is something to read from CGI */
1258                         int s = accepted_socket;
1259                         char *rbuf = iobuf;
1260
1261                         /* Are we still buffering CGI output? */
1262                         if (buf_count >= 0) {
1263                                 static const char HTTP_200[] = "HTTP/1.0 200 OK\r\n";
1264                                 /* Must use safe_read, not full_read, because
1265                                  * CGI may output a few first bytes and then wait
1266                                  * for POSTDATA without closing stdout.
1267                                  * With full_read we may wait here forever. */
1268                                 count = safe_read(inFd, rbuf + buf_count, PIPESIZE - 4);
1269                                 if (count <= 0) {
1270                                         /* eof (or error) and there was no "HTTP",
1271                                          * so add one and write out the received data */
1272                                         if (buf_count) {
1273                                                 full_write(s, HTTP_200, sizeof(HTTP_200)-1);
1274                                                 full_write(s, rbuf, buf_count);
1275                                         }
1276                                         break;  /* closed */
1277                                 }
1278                                 buf_count += count;
1279                                 count = 0;
1280                                 if (buf_count >= 4) {
1281                                         /* check to see if CGI added "HTTP" */
1282                                         if (memcmp(rbuf, HTTP_200, 4) != 0) {
1283                                                 /* there is no "HTTP", do it ourself */
1284                                                 if (full_write(s, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1285                                                         break;
1286                                         }
1287                                         /* example of valid CGI without "Content-type:"
1288                                          * echo -en "HTTP/1.0 302 Found\r\n"
1289                                          * echo -en "Location: http://www.busybox.net\r\n"
1290                                          * echo -en "\r\n"
1291                                         if (!strstr(rbuf, "ontent-")) {
1292                                                 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1293                                         }
1294                                          */
1295                                         count = buf_count;
1296                                         buf_count = -1; /* buffering off */
1297                                 }
1298                         } else {
1299                                 count = safe_read(inFd, rbuf, PIPESIZE);
1300                                 if (count <= 0)
1301                                         break;  /* eof (or error) */
1302                         }
1303                         if (full_write(s, rbuf, count) != count)
1304                                 break;
1305                         if (DEBUG)
1306                                 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1307                 } /* if (FD_ISSET(inFd)) */
1308         } /* while (1) */
1309         return 0;
1310 }
1311 #endif          /* FEATURE_HTTPD_CGI */
1312
1313 /****************************************************************************
1314  *
1315  > $Function: sendFile()
1316  *
1317  * $Description: Send a file response to a HTTP request
1318  *
1319  * $Parameter:
1320  *      (const char *) url . . The URL requested.
1321  *
1322  * $Return: (int)  . . . . . . Always 0.
1323  *
1324  ****************************************************************************/
1325 static int sendFile(const char *url)
1326 {
1327         char * suffix;
1328         int  f;
1329         const char * const * table;
1330         const char * try_suffix;
1331
1332         suffix = strrchr(url, '.');
1333
1334         for (table = suffixTable; *table; table += 2)
1335                 if (suffix != NULL && (try_suffix = strstr(*table, suffix)) != 0) {
1336                         try_suffix += strlen(suffix);
1337                         if (*try_suffix == 0 || *try_suffix == '.')
1338                                 break;
1339                 }
1340         /* also, if not found, set default as "application/octet-stream";  */
1341         found_mime_type = table[1];
1342 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1343         if (suffix) {
1344                 Htaccess * cur;
1345
1346                 for (cur = mime_a; cur; cur = cur->next) {
1347                         if (strcmp(cur->before_colon, suffix) == 0) {
1348                                 found_mime_type = cur->after_colon;
1349                                 break;
1350                         }
1351                 }
1352         }
1353 #endif  /* FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */
1354
1355         if (DEBUG)
1356                 fprintf(stderr, "sending file '%s' content-type: %s\n",
1357                         url, found_mime_type);
1358
1359         f = open(url, O_RDONLY);
1360         if (f >= 0) {
1361                 int count;
1362                 char *buf = iobuf;
1363
1364                 sendHeaders(HTTP_OK);
1365                 /* TODO: sendfile() */
1366                 while ((count = full_read(f, buf, MAX_MEMORY_BUFF)) > 0) {
1367                         int fd = accepted_socket;
1368                         if (fd == 0) fd++; /* write to fd# 1 in inetd mode */
1369                         if (full_write(fd, buf, count) != count)
1370                                 break;
1371                 }
1372                 close(f);
1373         } else {
1374                 if (DEBUG)
1375                         bb_perror_msg("cannot open '%s'", url);
1376                 sendHeaders(HTTP_NOT_FOUND);
1377         }
1378
1379         return 0;
1380 }
1381
1382 static int checkPermIP(void)
1383 {
1384         Htaccess_IP * cur;
1385
1386         /* This could stand some work */
1387         for (cur = ip_a_d; cur; cur = cur->next) {
1388 #if ENABLE_FEATURE_HTTPD_CGI && DEBUG
1389                 fprintf(stderr, "checkPermIP: '%s' ? ", rmt_ip_str);
1390 #endif
1391 #if DEBUG
1392                 fprintf(stderr, "'%u.%u.%u.%u/%u.%u.%u.%u'\n",
1393                         (unsigned char)(cur->ip >> 24),
1394                         (unsigned char)(cur->ip >> 16),
1395                         (unsigned char)(cur->ip >> 8),
1396                         (unsigned char)(cur->ip),
1397                         (unsigned char)(cur->mask >> 24),
1398                         (unsigned char)(cur->mask >> 16),
1399                         (unsigned char)(cur->mask >> 8),
1400                         (unsigned char)(cur->mask)
1401                 );
1402 #endif
1403                 if ((rmt_ip & cur->mask) == cur->ip)
1404                         return cur->allow_deny == 'A';   /* Allow/Deny */
1405         }
1406
1407         /* if unconfigured, return 1 - access from all */
1408         return !flg_deny_all;
1409 }
1410
1411 /****************************************************************************
1412  *
1413  > $Function: checkPerm()
1414  *
1415  * $Description: Check the permission file for access password protected.
1416  *
1417  *   If config file isn't present, everything is allowed.
1418  *   Entries are of the form you can see example from header source
1419  *
1420  * $Parameters:
1421  *      (const char *) path  . . . . The file path.
1422  *      (const char *) request . . . User information to validate.
1423  *
1424  * $Return: (int)  . . . . . . . . . 1 if request OK, 0 otherwise.
1425  *
1426  ****************************************************************************/
1427
1428 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1429 static int checkPerm(const char *path, const char *request)
1430 {
1431         Htaccess * cur;
1432         const char *p;
1433         const char *p0;
1434
1435         const char *prev = NULL;
1436
1437         /* This could stand some work */
1438         for (cur = g_auth; cur; cur = cur->next) {
1439                 size_t l;
1440
1441                 p0 = cur->before_colon;
1442                 if (prev != NULL && strcmp(prev, p0) != 0)
1443                         continue;       /* find next identical */
1444                 p = cur->after_colon;
1445                 if (DEBUG)
1446                         fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
1447
1448                 l = strlen(p0);
1449                 if (strncmp(p0, path, l) == 0
1450                  && (l == 1 || path[l] == '/' || path[l] == '\0')
1451                 ) {
1452                         char *u;
1453                         /* path match found.  Check request */
1454                         /* for check next /path:user:password */
1455                         prev = p0;
1456                         u = strchr(request, ':');
1457                         if (u == NULL) {
1458                                 /* bad request, ':' required */
1459                                 break;
1460                         }
1461
1462                         if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1463                                 char *cipher;
1464                                 char *pp;
1465
1466                                 if (strncmp(p, request, u-request) != 0) {
1467                                         /* user uncompared */
1468                                         continue;
1469                                 }
1470                                 pp = strchr(p, ':');
1471                                 if (pp && pp[1] == '$' && pp[2] == '1' &&
1472                                                 pp[3] == '$' && pp[4]) {
1473                                         pp++;
1474                                         cipher = pw_encrypt(u+1, pp);
1475                                         if (strcmp(cipher, pp) == 0)
1476                                                 goto set_remoteuser_var;   /* Ok */
1477                                         /* unauthorized */
1478                                         continue;
1479                                 }
1480                         }
1481
1482                         if (strcmp(p, request) == 0) {
1483 set_remoteuser_var:
1484                                 remoteuser = strdup(request);
1485                                 if (remoteuser)
1486                                         remoteuser[(u - request)] = 0;
1487                                 return 1;   /* Ok */
1488                         }
1489                         /* unauthorized */
1490                 }
1491         }   /* for */
1492
1493         return prev == NULL;
1494 }
1495
1496 #endif  /* FEATURE_HTTPD_BASIC_AUTH */
1497
1498 /****************************************************************************
1499  *
1500  > $Function: handle_sigalrm()
1501  *
1502  * $Description: Handle timeouts
1503  *
1504  ****************************************************************************/
1505
1506 static void handle_sigalrm(int sig)
1507 {
1508         sendHeaders(HTTP_REQUEST_TIMEOUT);
1509         alarm_signaled = 1;
1510 }
1511
1512 /****************************************************************************
1513  *
1514  > $Function: handleIncoming()
1515  *
1516  * $Description: Handle an incoming http request.
1517  *
1518  ****************************************************************************/
1519 static void handleIncoming(void)
1520 {
1521         char *buf = iobuf;
1522         char *url;
1523         char *purl;
1524         int  blank = -1;
1525         char *test;
1526         struct stat sb;
1527         int ip_allowed;
1528 #if ENABLE_FEATURE_HTTPD_CGI
1529         const char *prequest = request_GET;
1530         unsigned long length = 0;
1531         char *cookie = 0;
1532         char *content_type = 0;
1533 #endif
1534         fd_set s_fd;
1535         struct timeval tv;
1536         int retval;
1537         struct sigaction sa;
1538
1539 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1540         int credentials = -1;  /* if not required this is Ok */
1541 #endif
1542
1543         sa.sa_handler = handle_sigalrm;
1544         sigemptyset(&sa.sa_mask);
1545         sa.sa_flags = 0; /* no SA_RESTART */
1546         sigaction(SIGALRM, &sa, NULL);
1547
1548         do {
1549                 int count;
1550
1551                 (void) alarm(TIMEOUT);
1552                 if (getLine() <= 0)
1553                         break;  /* closed */
1554
1555                 purl = strpbrk(buf, " \t");
1556                 if (purl == NULL) {
1557  BAD_REQUEST:
1558                         sendHeaders(HTTP_BAD_REQUEST);
1559                         break;
1560                 }
1561                 *purl = '\0';
1562 #if ENABLE_FEATURE_HTTPD_CGI
1563                 if (strcasecmp(buf, prequest) != 0) {
1564                         prequest = "POST";
1565                         if (strcasecmp(buf, prequest) != 0) {
1566                                 sendHeaders(HTTP_NOT_IMPLEMENTED);
1567                                 break;
1568                         }
1569                 }
1570 #else
1571                 if (strcasecmp(buf, request_GET) != 0) {
1572                         sendHeaders(HTTP_NOT_IMPLEMENTED);
1573                         break;
1574                 }
1575 #endif
1576                 *purl = ' ';
1577                 count = sscanf(purl, " %[^ ] HTTP/%d.%*d", buf, &blank);
1578
1579                 if (count < 1 || buf[0] != '/') {
1580                         /* Garbled request/URL */
1581                         goto BAD_REQUEST;
1582                 }
1583                 url = alloca(strlen(buf) + sizeof("/index.html"));
1584                 if (url == NULL) {
1585                         sendHeaders(HTTP_INTERNAL_SERVER_ERROR);
1586                         break;
1587                 }
1588                 strcpy(url, buf);
1589                 /* extract url args if present */
1590                 test = strchr(url, '?');
1591                 g_query = NULL;
1592                 if (test) {
1593                         *test++ = '\0';
1594                         g_query = test;
1595                 }
1596
1597                 test = decodeString(url, 0);
1598                 if (test == NULL)
1599                         goto BAD_REQUEST;
1600                 if (test == url+1) {
1601                         /* '/' or NUL is encoded */
1602                         sendHeaders(HTTP_NOT_FOUND);
1603                         break;
1604                 }
1605
1606                 /* algorithm stolen from libbb bb_simplify_path(),
1607                  * but don't strdup and reducing trailing slash and protect out root */
1608                 purl = test = url;
1609                 do {
1610                         if (*purl == '/') {
1611                                 /* skip duplicate (or initial) slash */
1612                                 if (*test == '/') {
1613                                         continue;
1614                                 }
1615                                 if (*test == '.') {
1616                                         /* skip extra '.' */
1617                                         if (test[1] == '/' || !test[1]) {
1618                                                 continue;
1619                                         }
1620                                         /* '..': be careful */
1621                                         if (test[1] == '.' && (test[2] == '/' || !test[2])) {
1622                                                 ++test;
1623                                                 if (purl == url) {
1624                                                         /* protect out root */
1625                                                         goto BAD_REQUEST;
1626                                                 }
1627                                                 while (*--purl != '/') /* omit previous dir */;
1628                                                         continue;
1629                                         }
1630                                 }
1631                         }
1632                         *++purl = *test;
1633                 } while (*++test);
1634                 *++purl = '\0';       /* so keep last character */
1635                 test = purl;          /* end ptr */
1636
1637                 /* If URL is directory, adding '/' */
1638                 if (test[-1] != '/') {
1639                         if (is_directory(url + 1, 1, &sb)) {
1640                                 found_moved_temporarily = url;
1641                         }
1642                 }
1643                 if (DEBUG)
1644                         fprintf(stderr, "url='%s', args=%s\n", url, g_query);
1645
1646                 test = url;
1647                 ip_allowed = checkPermIP();
1648                 while (ip_allowed && (test = strchr(test + 1, '/')) != NULL) {
1649                         /* have path1/path2 */
1650                         *test = '\0';
1651                         if (is_directory(url + 1, 1, &sb)) {
1652                                 /* may be having subdir config */
1653                                 parse_conf(url + 1, SUBDIR_PARSE);
1654                                 ip_allowed = checkPermIP();
1655                         }
1656                         *test = '/';
1657                 }
1658                 if (blank >= 0) {
1659                         /* read until blank line for HTTP version specified, else parse immediate */
1660                         while (1) {
1661                                 alarm(TIMEOUT);
1662                                 count = getLine();
1663                                 if (count <= 0)
1664                                         break;
1665
1666                                 if (DEBUG)
1667                                         fprintf(stderr, "header: '%s'\n", buf);
1668
1669 #if ENABLE_FEATURE_HTTPD_CGI
1670                                 /* try and do our best to parse more lines */
1671                                 if ((STRNCASECMP(buf, "Content-length:") == 0)) {
1672                                         /* extra read only for POST */
1673                                         if (prequest != request_GET) {
1674                                                 test = buf + sizeof("Content-length:")-1;
1675                                                 if (!test[0])
1676                                                         goto bail_out;
1677                                                 errno = 0;
1678                                                 /* not using strtoul: it ignores leading munis! */
1679                                                 length = strtol(test, &test, 10);
1680                                                 /* length is "ulong", but we need to pass it to int later */
1681                                                 /* so we check for negative or too large values in one go: */
1682                                                 /* (long -> ulong conv caused negatives to be seen as > INT_MAX) */
1683                                                 if (test[0] || errno || length > INT_MAX)
1684                                                         goto bail_out;
1685                                         }
1686                                 } else if ((STRNCASECMP(buf, "Cookie:") == 0)) {
1687                                         cookie = strdup(skip_whitespace(buf + sizeof("Cookie:")-1));
1688                                 } else if ((STRNCASECMP(buf, "Content-Type:") == 0)) {
1689                                         content_type = strdup(skip_whitespace(buf + sizeof("Content-Type:")-1));
1690                                 } else if ((STRNCASECMP(buf, "Referer:") == 0)) {
1691                                         referer = strdup(skip_whitespace(buf + sizeof("Referer:")-1));
1692                                 }
1693 #endif
1694
1695 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1696                                 if (STRNCASECMP(buf, "Authorization:") == 0) {
1697                                         /* We only allow Basic credentials.
1698                                          * It shows up as "Authorization: Basic <userid:password>" where
1699                                          * the userid:password is base64 encoded.
1700                                          */
1701                                         test = skip_whitespace(buf + sizeof("Authorization:")-1);
1702                                         if (STRNCASECMP(test, "Basic") != 0)
1703                                                 continue;
1704                                         test += sizeof("Basic")-1;
1705                                         /* decodeBase64() skips whitespace itself */
1706                                         decodeBase64(test);
1707                                         credentials = checkPerm(url, test);
1708                                 }
1709 #endif          /* FEATURE_HTTPD_BASIC_AUTH */
1710
1711                         } /* while extra header reading */
1712                 }
1713                 alarm(0);
1714                 if (alarm_signaled)
1715                         break;
1716
1717                 if (strcmp(strrchr(url, '/') + 1, httpd_conf) == 0 || ip_allowed == 0) {
1718                         /* protect listing [/path]/httpd_conf or IP deny */
1719 #if ENABLE_FEATURE_HTTPD_CGI
1720  FORBIDDEN:             /* protect listing /cgi-bin */
1721 #endif
1722                         sendHeaders(HTTP_FORBIDDEN);
1723                         break;
1724                 }
1725
1726 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1727                 if (credentials <= 0 && checkPerm(url, ":") == 0) {
1728                         sendHeaders(HTTP_UNAUTHORIZED);
1729                         break;
1730                 }
1731 #endif
1732
1733                 if (found_moved_temporarily) {
1734                         sendHeaders(HTTP_MOVED_TEMPORARILY);
1735                         /* clear unforked memory flag */
1736                         found_moved_temporarily = NULL;
1737                         break;
1738                 }
1739
1740                 test = url + 1;      /* skip first '/' */
1741
1742 #if ENABLE_FEATURE_HTTPD_CGI
1743                 if (strncmp(test, "cgi-bin", 7) == 0) {
1744                         if (test[7] == '/' && test[8] == 0)
1745                                 goto FORBIDDEN;     /* protect listing cgi-bin/ */
1746                         sendCgi(url, prequest, length, cookie, content_type);
1747                         break;
1748                 }
1749 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1750                 {
1751                         char *suffix = strrchr(test, '.');
1752                         if (suffix) {
1753                                 Htaccess *cur;
1754                                 for (cur = script_i; cur; cur = cur->next) {
1755                                         if (strcmp(cur->before_colon + 1, suffix) == 0) {
1756                                                 sendCgi(url, prequest, length, cookie, content_type);
1757                                                 goto bail_out;
1758                                         }
1759                                 }
1760                         }
1761                 }
1762 #endif
1763                 if (prequest != request_GET) {
1764                         sendHeaders(HTTP_NOT_IMPLEMENTED);
1765                         break;
1766                 }
1767 #endif  /* FEATURE_HTTPD_CGI */
1768                 if (purl[-1] == '/')
1769                         strcpy(purl, "index.html");
1770                 if (stat(test, &sb) == 0) {
1771                         /* It's a dir URL and there is index.html */
1772                         ContentLength = sb.st_size;
1773                         last_mod = sb.st_mtime;
1774                 }
1775 #if ENABLE_FEATURE_HTTPD_CGI
1776                 else if (purl[-1] == '/') {
1777                         /* It's a dir URL and there is no index.html
1778                          * Try cgi-bin/index.cgi */
1779                         if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
1780                                 purl[0] = '\0';
1781                                 g_query = url;
1782                                 sendCgi("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
1783                                 break;
1784                         }
1785                 }
1786 #endif  /* FEATURE_HTTPD_CGI */
1787                 sendFile(test);
1788                 ContentLength = -1;
1789         } while (0);
1790
1791 #if ENABLE_FEATURE_HTTPD_CGI
1792  bail_out:
1793 #endif
1794
1795         if (DEBUG)
1796                 fprintf(stderr, "closing socket\n\n");
1797 #if ENABLE_FEATURE_HTTPD_CGI
1798         free(cookie);
1799         free(content_type);
1800         free(referer);
1801         referer = NULL;
1802 # if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1803         free(remoteuser);
1804         remoteuser = NULL;
1805 # endif
1806 #endif
1807         shutdown(accepted_socket, SHUT_WR);
1808
1809         /* Properly wait for remote to closed */
1810         FD_ZERO(&s_fd);
1811         FD_SET(accepted_socket, &s_fd);
1812
1813         do {
1814                 tv.tv_sec = 2;
1815                 tv.tv_usec = 0;
1816                 retval = select(accepted_socket + 1, &s_fd, NULL, NULL, &tv);
1817         } while (retval > 0 && read(accepted_socket, buf, sizeof(iobuf) > 0));
1818
1819         shutdown(accepted_socket, SHUT_RD);
1820         /* In inetd case, we close fd 1 (stdout) here. We will exit soon anyway */
1821         close(accepted_socket);
1822 }
1823
1824 /****************************************************************************
1825  *
1826  > $Function: miniHttpd()
1827  *
1828  * $Description: The main http server function.
1829  *
1830  *   Given an open socket fildes, listen for new connections and farm out
1831  *   the processing as a forked process.
1832  *
1833  * $Parameters:
1834  *      (int) server. . . The server socket fildes.
1835  *
1836  * $Return: (int) . . . . Always 0.
1837  *
1838  ****************************************************************************/
1839 static int miniHttpd(int server)
1840 {
1841         fd_set readfd, portfd;
1842
1843         FD_ZERO(&portfd);
1844         FD_SET(server, &portfd);
1845
1846         /* copy the ports we are watching to the readfd set */
1847         while (1) {
1848                 int s;
1849                 union {
1850                         struct sockaddr sa;
1851                         struct sockaddr_in sin;
1852                         USE_FEATURE_IPV6(struct sockaddr_in6 sin6;)
1853                 } fromAddr;
1854                 socklen_t fromAddrLen = sizeof(fromAddr);
1855
1856                 /* Now wait INDEFINITELY on the set of sockets! */
1857                 readfd = portfd;
1858                 if (select(server + 1, &readfd, 0, 0, 0) <= 0)
1859                         continue;
1860                 if (!FD_ISSET(server, &readfd))
1861                         continue;
1862                 s = accept(server, &fromAddr.sa, &fromAddrLen);
1863                 if (s < 0)
1864                         continue;
1865                 accepted_socket = s;
1866                 rmt_ip = 0;
1867                 tcp_port = 0;
1868 #if ENABLE_FEATURE_HTTPD_CGI || DEBUG
1869                 free(rmt_ip_str);
1870                 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr.sa, fromAddrLen);
1871 #if DEBUG
1872                 bb_error_msg("connection from '%s'", rmt_ip_str);
1873 #endif
1874 #endif /* FEATURE_HTTPD_CGI */
1875                 if (fromAddr.sa.sa_family == AF_INET) {
1876                         rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
1877                         tcp_port = ntohs(fromAddr.sin.sin_port);
1878                 }
1879 #if ENABLE_FEATURE_IPV6
1880                 if (fromAddr.sa.sa_family == AF_INET6) {
1881                         //rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
1882                         tcp_port = ntohs(fromAddr.sin6.sin6_port);
1883                 }
1884 #endif
1885
1886                 /* set the KEEPALIVE option to cull dead connections */
1887                 setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
1888
1889                 if (DEBUG || fork() == 0) {
1890                         /* child */
1891 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1892                         /* protect reload config, may be confuse checking */
1893                         signal(SIGHUP, SIG_IGN);
1894 #endif
1895                         handleIncoming();
1896                         if (!DEBUG)
1897                                 exit(0);
1898                 }
1899                 close(s);
1900         } /* while (1) */
1901         return 0;
1902 }
1903
1904 /* from inetd */
1905 static int miniHttpd_inetd(void)
1906 {
1907         union {
1908                 struct sockaddr sa;
1909                 struct sockaddr_in sin;
1910                 USE_FEATURE_IPV6(struct sockaddr_in6 sin6;)
1911         } fromAddr;
1912         socklen_t fromAddrLen = sizeof(fromAddr);
1913
1914         getpeername(0, &fromAddr.sa, &fromAddrLen);
1915         rmt_ip = 0;
1916         tcp_port = 0;
1917 #if ENABLE_FEATURE_HTTPD_CGI || DEBUG
1918         free(rmt_ip_str);
1919         rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr.sa, fromAddrLen);
1920 #endif
1921         if (fromAddr.sa.sa_family == AF_INET) {
1922                 rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
1923                 tcp_port = ntohs(fromAddr.sin.sin_port);
1924         }
1925 #if ENABLE_FEATURE_IPV6
1926         if (fromAddr.sa.sa_family == AF_INET6) {
1927                 //rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr);
1928                 tcp_port = ntohs(fromAddr.sin6.sin6_port);
1929         }
1930 #endif
1931         handleIncoming();
1932         return 0;
1933 }
1934
1935 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1936 static void sighup_handler(int sig)
1937 {
1938         /* set and reset */
1939         struct sigaction sa;
1940
1941         parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
1942         sa.sa_handler = sighup_handler;
1943         sigemptyset(&sa.sa_mask);
1944         sa.sa_flags = SA_RESTART;
1945         sigaction(SIGHUP, &sa, NULL);
1946 }
1947 #endif
1948
1949 enum {
1950         c_opt_config_file = 0,
1951         d_opt_decode_url,
1952         h_opt_home_httpd,
1953         USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
1954         USE_FEATURE_HTTPD_BASIC_AUTH(    r_opt_realm     ,)
1955         USE_FEATURE_HTTPD_AUTH_MD5(      m_opt_md5       ,)
1956         USE_FEATURE_HTTPD_SETUID(        u_opt_setuid    ,)
1957         p_opt_port      ,
1958         p_opt_inetd     ,
1959         p_opt_foreground,
1960         OPT_CONFIG_FILE = 1 << c_opt_config_file,
1961         OPT_DECODE_URL  = 1 << d_opt_decode_url,
1962         OPT_HOME_HTTPD  = 1 << h_opt_home_httpd,
1963         OPT_ENCODE_URL  = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
1964         OPT_REALM       = USE_FEATURE_HTTPD_BASIC_AUTH(    (1 << r_opt_realm     )) + 0,
1965         OPT_MD5         = USE_FEATURE_HTTPD_AUTH_MD5(      (1 << m_opt_md5       )) + 0,
1966         OPT_SETUID      = USE_FEATURE_HTTPD_SETUID(        (1 << u_opt_setuid    )) + 0,
1967         OPT_PORT        = 1 << p_opt_port,
1968         OPT_INETD       = 1 << p_opt_inetd,
1969         OPT_FOREGROUND  = 1 << p_opt_foreground,
1970 };
1971
1972
1973 int httpd_main(int argc, char **argv);
1974 int httpd_main(int argc, char **argv)
1975 {
1976         unsigned opt;
1977         char *url_for_decode;
1978         USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
1979         const char *s_port;
1980         USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
1981         USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
1982         USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
1983
1984 #if ENABLE_LOCALE_SUPPORT
1985         /* Undo busybox.c: we want to speak English in http (dates etc) */
1986         setlocale(LC_TIME, "C");
1987 #endif
1988
1989         INIT_G();
1990         home_httpd = xrealloc_getcwd_or_warn(NULL);
1991         /* We do not "absolutize" path given by -h (home) opt.
1992          * If user gives relative path in -h, $SCRIPT_FILENAME can end up
1993          * relative too. */
1994         opt = getopt32(argc, argv, "c:d:h:"
1995                         USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
1996                         USE_FEATURE_HTTPD_BASIC_AUTH("r:")
1997                         USE_FEATURE_HTTPD_AUTH_MD5("m:")
1998                         USE_FEATURE_HTTPD_SETUID("u:")
1999                         "p:if",
2000                         &(configFile), &url_for_decode, &home_httpd
2001                         USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2002                         USE_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2003                         USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
2004                         USE_FEATURE_HTTPD_SETUID(, &s_ugid)
2005                         , &s_port
2006                 );
2007         if (opt & OPT_DECODE_URL) {
2008                 printf("%s", decodeString(url_for_decode, 1));
2009                 return 0;
2010         }
2011 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2012         if (opt & OPT_ENCODE_URL) {
2013                 printf("%s", encodeString(url_for_encode));
2014                 return 0;
2015         }
2016 #endif
2017 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2018         if (opt & OPT_MD5) {
2019                 puts(pw_encrypt(pass, "$1$"));
2020                 return 0;
2021         }
2022 #endif
2023         if (opt & OPT_PORT)
2024                 tcp_port = xatou16(s_port);
2025
2026 #if ENABLE_FEATURE_HTTPD_SETUID
2027         if (opt & OPT_SETUID) {
2028                 if (!get_uidgid(&ugid, s_ugid, 1))
2029                         bb_error_msg_and_die("unrecognized user[:group] "
2030                                                 "name '%s'", s_ugid);
2031         }
2032 #endif
2033
2034         xchdir(home_httpd);
2035         if (!(opt & OPT_INETD)) {
2036                 signal(SIGCHLD, SIG_IGN);
2037                 server_socket = openServer();
2038 #if ENABLE_FEATURE_HTTPD_SETUID
2039                 /* drop privileges */
2040                 if (opt & OPT_SETUID) {
2041                         if (ugid.gid != (gid_t)-1) {
2042                                 if (setgroups(1, &ugid.gid) == -1)
2043                                         bb_perror_msg_and_die("setgroups");
2044                                 xsetgid(ugid.gid);
2045                         }
2046                         xsetuid(ugid.uid);
2047                 }
2048 #endif
2049         }
2050
2051 #if ENABLE_FEATURE_HTTPD_CGI
2052         {
2053                 char *p = getenv("PATH");
2054                 /* env strings themself are not freed, no need to strdup(p): */
2055                 clearenv();
2056                 if (p)
2057                         putenv(p - 5);
2058                 if (!(opt & OPT_INETD))
2059                         setenv_long("SERVER_PORT", tcp_port);
2060         }
2061 #endif
2062
2063 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2064         sighup_handler(0);
2065 #else
2066         parse_conf(default_path_httpd_conf, FIRST_PARSE);
2067 #endif
2068
2069         if (opt & OPT_INETD)
2070                 return miniHttpd_inetd();
2071
2072         if (!(opt & OPT_FOREGROUND))
2073                 bb_daemonize(0);     /* don't change current directory */
2074         return miniHttpd(server_socket);
2075 }