diff options
Diffstat (limited to 'networking/httpd.c')
| -rw-r--r-- | networking/httpd.c | 2432 |
1 files changed, 2432 insertions, 0 deletions
diff --git a/networking/httpd.c b/networking/httpd.c new file mode 100644 index 0000000..db8eb1e --- /dev/null +++ b/networking/httpd.c @@ -0,0 +1,2432 @@ +/* vi: set sw=4 ts=4: */ +/* + * httpd implementation for busybox + * + * Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org> + * Copyright (C) 2003-2006 Vladimir Oleynik <dzo@simtreas.ru> + * + * simplify patch stolen from libbb without using strdup + * + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + * + ***************************************************************************** + * + * Typical usage: + * for non root user + * httpd -p 8080 -h $HOME/public_html + * or for daemon start from rc script with uid=0: + * httpd -u www + * This is equivalent if www user have uid=80 to + * httpd -p 80 -u 80 -h /www -c /etc/httpd.conf -r "Web Server Authentication" + * + * + * When a url starts by "/cgi-bin/" it is assumed to be a cgi script. The + * server changes directory to the location of the script and executes it + * after setting QUERY_STRING and other environment variables. + * + * Doc: + * "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html + * + * The applet can also be invoked as a url arg decoder and html text encoder + * as follows: + * foo=`httpd -d $foo` # decode "Hello%20World" as "Hello World" + * bar=`httpd -e "<Hello World>"` # encode as "<Hello World>" + * Note that url encoding for arguments is not the same as html encoding for + * presentation. -d decodes a url-encoded argument while -e encodes in html + * for page display. + * + * httpd.conf has the following format: + * + * H:/serverroot # define the server root. It will override -h + * A:172.20. # Allow address from 172.20.0.0/16 + * A:10.0.0.0/25 # Allow any address from 10.0.0.0-10.0.0.127 + * A:10.0.0.0/255.255.255.128 # Allow any address that previous set + * A:127.0.0.1 # Allow local loopback connections + * D:* # Deny from other IP connections + * E404:/path/e404.html # /path/e404.html is the 404 (not found) error page + * I:index.html # Show index.html when a directory is requested + * + * P:/url:[http://]hostname[:port]/new/path + * # When /urlXXXXXX is requested, reverse proxy + * # it to http://hostname[:port]/new/pathXXXXXX + * + * /cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/ + * /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/ + * /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/ + * .au:audio/basic # additional mime type for audio.au files + * *.php:/path/php # running cgi.php scripts through an interpreter + * + * A/D may be as a/d or allow/deny - only first char matters. + * Deny/Allow IP logic: + * - Default is to allow all (Allow all (A:*) is a no-op). + * - Deny rules take precedence over allow rules. + * - "Deny all" rule (D:*) is applied last. + * + * Example: + * 1. Allow only specified addresses + * A:172.20 # Allow any address that begins with 172.20. + * A:10.10. # Allow any address that begins with 10.10. + * A:127.0.0.1 # Allow local loopback connections + * D:* # Deny from other IP connections + * + * 2. Only deny specified addresses + * D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255 + * D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255 + * A:* # (optional line added for clarity) + * + * If a sub directory contains a config file it is parsed and merged with + * any existing settings as if it was appended to the original configuration. + * + * subdir paths are relative to the containing subdir and thus cannot + * affect the parent rules. + * + * Note that since the sub dir is parsed in the forked thread servicing the + * subdir http request, any merge is discarded when the process exits. As a + * result, the subdir settings only have a lifetime of a single request. + * + * Custom error pages can contain an absolute path or be relative to + * 'home_httpd'. Error pages are to be static files (no CGI or script). Error + * page can only be defined in the root configuration file and are not taken + * into account in local (directories) config files. + * + * If -c is not set, an attempt will be made to open the default + * root configuration file. If -c is set and the file is not found, the + * server exits with an error. + * + */ + +#include "libbb.h" +#if ENABLE_FEATURE_HTTPD_USE_SENDFILE +#include <sys/sendfile.h> +#endif + +//#define DEBUG 1 +#define DEBUG 0 + +#define IOBUF_SIZE 8192 /* IO buffer */ + +/* amount of buffering in a pipe */ +#ifndef PIPE_BUF +# define PIPE_BUF 4096 +#endif +#if PIPE_BUF >= IOBUF_SIZE +# error "PIPE_BUF >= IOBUF_SIZE" +#endif + +#define HEADER_READ_TIMEOUT 60 + +static const char default_path_httpd_conf[] ALIGN1 = "/etc"; +static const char httpd_conf[] ALIGN1 = "httpd.conf"; +static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n"; + +typedef struct has_next_ptr { + struct has_next_ptr *next; +} has_next_ptr; + +/* Must have "next" as a first member */ +typedef struct Htaccess { + struct Htaccess *next; + char *after_colon; + char before_colon[1]; /* really bigger, must be last */ +} Htaccess; + +/* Must have "next" as a first member */ +typedef struct Htaccess_IP { + struct Htaccess_IP *next; + unsigned ip; + unsigned mask; + int allow_deny; +} Htaccess_IP; + +/* Must have "next" as a first member */ +typedef struct Htaccess_Proxy { + struct Htaccess_Proxy *next; + char *url_from; + char *host_port; + char *url_to; +} Htaccess_Proxy; + +enum { + HTTP_OK = 200, + HTTP_PARTIAL_CONTENT = 206, + HTTP_MOVED_TEMPORARILY = 302, + HTTP_BAD_REQUEST = 400, /* malformed syntax */ + HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */ + HTTP_NOT_FOUND = 404, + HTTP_FORBIDDEN = 403, + HTTP_REQUEST_TIMEOUT = 408, + HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */ + HTTP_INTERNAL_SERVER_ERROR = 500, + HTTP_CONTINUE = 100, +#if 0 /* future use */ + HTTP_SWITCHING_PROTOCOLS = 101, + HTTP_CREATED = 201, + HTTP_ACCEPTED = 202, + HTTP_NON_AUTHORITATIVE_INFO = 203, + HTTP_NO_CONTENT = 204, + HTTP_MULTIPLE_CHOICES = 300, + HTTP_MOVED_PERMANENTLY = 301, + HTTP_NOT_MODIFIED = 304, + HTTP_PAYMENT_REQUIRED = 402, + HTTP_BAD_GATEWAY = 502, + HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */ + HTTP_RESPONSE_SETSIZE = 0xffffffff +#endif +}; + +static const uint16_t http_response_type[] ALIGN2 = { + HTTP_OK, +#if ENABLE_FEATURE_HTTPD_RANGES + HTTP_PARTIAL_CONTENT, +#endif + HTTP_MOVED_TEMPORARILY, + HTTP_REQUEST_TIMEOUT, + HTTP_NOT_IMPLEMENTED, +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + HTTP_UNAUTHORIZED, +#endif + HTTP_NOT_FOUND, + HTTP_BAD_REQUEST, + HTTP_FORBIDDEN, + HTTP_INTERNAL_SERVER_ERROR, +#if 0 /* not implemented */ + HTTP_CREATED, + HTTP_ACCEPTED, + HTTP_NO_CONTENT, + HTTP_MULTIPLE_CHOICES, + HTTP_MOVED_PERMANENTLY, + HTTP_NOT_MODIFIED, + HTTP_BAD_GATEWAY, + HTTP_SERVICE_UNAVAILABLE, +#endif +}; + +static const struct { + const char *name; + const char *info; +} http_response[ARRAY_SIZE(http_response_type)] = { + { "OK", NULL }, +#if ENABLE_FEATURE_HTTPD_RANGES + { "Partial Content", NULL }, +#endif + { "Found", NULL }, + { "Request Timeout", "No request appeared within 60 seconds" }, + { "Not Implemented", "The requested method is not recognized" }, +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + { "Unauthorized", "" }, +#endif + { "Not Found", "The requested URL was not found" }, + { "Bad Request", "Unsupported method" }, + { "Forbidden", "" }, + { "Internal Server Error", "Internal Server Error" }, +#if 0 /* not implemented */ + { "Created" }, + { "Accepted" }, + { "No Content" }, + { "Multiple Choices" }, + { "Moved Permanently" }, + { "Not Modified" }, + { "Bad Gateway", "" }, + { "Service Unavailable", "" }, +#endif +}; + + +struct globals { + int verbose; /* must be int (used by getopt32) */ + smallint flg_deny_all; + + unsigned rmt_ip; /* used for IP-based allow/deny rules */ + time_t last_mod; + char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */ + const char *bind_addr_or_port; + + const char *g_query; + const char *configFile; + const char *home_httpd; + const char *index_page; + + const char *found_mime_type; + const char *found_moved_temporarily; + Htaccess_IP *ip_a_d; /* config allow/deny lines */ + + USE_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;) + USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;) + USE_FEATURE_HTTPD_CGI(char *referer;) + USE_FEATURE_HTTPD_CGI(char *user_agent;) + USE_FEATURE_HTTPD_CGI(char *http_accept;) + USE_FEATURE_HTTPD_CGI(char *http_accept_language;) + + off_t file_size; /* -1 - unknown */ +#if ENABLE_FEATURE_HTTPD_RANGES + off_t range_start; + off_t range_end; + off_t range_len; +#endif + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + Htaccess *g_auth; /* config user:password lines */ +#endif +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES + Htaccess *mime_a; /* config mime types */ +#endif +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + Htaccess *script_i; /* config script interpreters */ +#endif + char *iobuf; /* [IOBUF_SIZE] */ +#define hdr_buf bb_common_bufsiz1 + char *hdr_ptr; + int hdr_cnt; +#if ENABLE_FEATURE_HTTPD_ERROR_PAGES + const char *http_error_page[ARRAY_SIZE(http_response_type)]; +#endif +#if ENABLE_FEATURE_HTTPD_PROXY + Htaccess_Proxy *proxy; +#endif +}; +#define G (*ptr_to_globals) +#define verbose (G.verbose ) +#define flg_deny_all (G.flg_deny_all ) +#define rmt_ip (G.rmt_ip ) +#define bind_addr_or_port (G.bind_addr_or_port) +#define g_query (G.g_query ) +#define configFile (G.configFile ) +#define home_httpd (G.home_httpd ) +#define index_page (G.index_page ) +#define found_mime_type (G.found_mime_type ) +#define found_moved_temporarily (G.found_moved_temporarily) +#define last_mod (G.last_mod ) +#define ip_a_d (G.ip_a_d ) +#define g_realm (G.g_realm ) +#define remoteuser (G.remoteuser ) +#define referer (G.referer ) +#define user_agent (G.user_agent ) +#define http_accept (G.http_accept ) +#define http_accept_language (G.http_accept_language) +#define file_size (G.file_size ) +#if ENABLE_FEATURE_HTTPD_RANGES +#define range_start (G.range_start ) +#define range_end (G.range_end ) +#define range_len (G.range_len ) +#endif +#define rmt_ip_str (G.rmt_ip_str ) +#define g_auth (G.g_auth ) +#define mime_a (G.mime_a ) +#define script_i (G.script_i ) +#define iobuf (G.iobuf ) +#define hdr_ptr (G.hdr_ptr ) +#define hdr_cnt (G.hdr_cnt ) +#define http_error_page (G.http_error_page ) +#define proxy (G.proxy ) +#define INIT_G() do { \ + SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ + USE_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \ + bind_addr_or_port = "80"; \ + index_page = "index.html"; \ + file_size = -1; \ +} while (0) + +#if !ENABLE_FEATURE_HTTPD_RANGES +enum { + range_start = 0, + range_end = MAXINT(off_t) - 1, + range_len = MAXINT(off_t), +}; +#endif + + +#define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1) + +/* Prototypes */ +enum { + SEND_HEADERS = (1 << 0), + SEND_BODY = (1 << 1), + SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY, +}; +static void send_file_and_exit(const char *url, int what) NORETURN; + +static void free_llist(has_next_ptr **pptr) +{ + has_next_ptr *cur = *pptr; + while (cur) { + has_next_ptr *t = cur; + cur = cur->next; + free(t); + } + *pptr = NULL; +} + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH \ + || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \ + || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR +static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr) +{ + free_llist((has_next_ptr**)pptr); +} +#endif + +static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr) +{ + free_llist((has_next_ptr**)pptr); +} + +/* Returns presumed mask width in bits or < 0 on error. + * Updates strp, stores IP at provided pointer */ +static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc) +{ + const char *p = *strp; + int auto_mask = 8; + unsigned ip = 0; + int j; + + if (*p == '/') + return -auto_mask; + + for (j = 0; j < 4; j++) { + unsigned octet; + + if ((*p < '0' || *p > '9') && *p != '/' && *p) + return -auto_mask; + octet = 0; + while (*p >= '0' && *p <= '9') { + octet *= 10; + octet += *p - '0'; + if (octet > 255) + return -auto_mask; + p++; + } + if (*p == '.') + p++; + if (*p != '/' && *p) + auto_mask += 8; + ip = (ip << 8) | octet; + } + if (*p) { + if (*p != endc) + return -auto_mask; + p++; + if (*p == '\0') + return -auto_mask; + } + *ipp = ip; + *strp = p; + return auto_mask; +} + +/* Returns 0 on success. Stores IP and mask at provided pointers */ +static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp) +{ + int i; + unsigned mask; + char *p; + + i = scan_ip(&str, ipp, '/'); + if (i < 0) + return i; + + if (*str) { + /* there is /xxx after dotted-IP address */ + i = bb_strtou(str, &p, 10); + if (*p == '.') { + /* 'xxx' itself is dotted-IP mask, parse it */ + /* (return 0 (success) only if it has N.N.N.N form) */ + return scan_ip(&str, maskp, '\0') - 32; + } + if (*p) + return -1; + } + + if (i > 32) + return -1; + + if (sizeof(unsigned) == 4 && i == 32) { + /* mask >>= 32 below may not work */ + mask = 0; + } else { + mask = 0xffffffff; + mask >>= i; + } + /* i == 0 -> *maskp = 0x00000000 + * i == 1 -> *maskp = 0x80000000 + * i == 4 -> *maskp = 0xf0000000 + * i == 31 -> *maskp = 0xfffffffe + * i == 32 -> *maskp = 0xffffffff */ + *maskp = (uint32_t)(~mask); + return 0; +} + +/* + * Parse configuration file into in-memory linked list. + * + * The first non-white character is examined to determine if the config line + * is one of the following: + * .ext:mime/type # new mime type not compiled into httpd + * [adAD]:from # ip address allow/deny, * for wildcard + * /path:user:pass # username/password + * Ennn:error.html # error page for status nnn + * P:/url:[http://]hostname[:port]/new/path # reverse proxy + * + * Any previous IP rules are discarded. + * If the flag argument is not SUBDIR_PARSE then all /path and mime rules + * are also discarded. That is, previous settings are retained if flag is + * SUBDIR_PARSE. + * Error pages are only parsed on the main config file. + * + * path Path where to look for httpd.conf (without filename). + * flag Type of the parse request. + */ +/* flag */ +#define FIRST_PARSE 0 +#define SUBDIR_PARSE 1 +#define SIGNALED_PARSE 2 +#define FIND_FROM_HTTPD_ROOT 3 +static void parse_conf(const char *path, int flag) +{ + FILE *f; +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + Htaccess *prev; +#endif +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH \ + || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \ + || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + Htaccess *cur; +#endif + const char *filename = configFile; + char buf[160]; + char *p, *p0; + char *after_colon; + Htaccess_IP *pip; + + /* discard old rules */ + free_Htaccess_IP_list(&ip_a_d); + flg_deny_all = 0; +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH \ + || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \ + || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + /* retain previous auth and mime config only for subdir parse */ + if (flag != SUBDIR_PARSE) { +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + free_Htaccess_list(&g_auth); +#endif +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES + free_Htaccess_list(&mime_a); +#endif +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + free_Htaccess_list(&script_i); +#endif + } +#endif + + if (flag == SUBDIR_PARSE || filename == NULL) { + filename = alloca(strlen(path) + sizeof(httpd_conf) + 2); + sprintf((char *)filename, "%s/%s", path, httpd_conf); + } + + while ((f = fopen_for_read(filename)) == NULL) { + if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) { + /* config file not found, no changes to config */ + return; + } + if (configFile && flag == FIRST_PARSE) /* if -c option given */ + bb_simple_perror_msg_and_die(filename); + flag = FIND_FROM_HTTPD_ROOT; + filename = httpd_conf; + } + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + prev = g_auth; +#endif + /* This could stand some work */ + while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) { + after_colon = NULL; + for (p = p0; *p0 != '\0' && *p0 != '#'; p0++) { + if (!isspace(*p0)) { + *p++ = *p0; + if (*p0 == ':' && after_colon == NULL) + after_colon = p; + } + } + *p = '\0'; + + /* test for empty or strange line */ + if (after_colon == NULL || *after_colon == '\0') + continue; + p0 = buf; + if (*p0 == 'd' || *p0 == 'a') + *p0 -= 0x20; /* a/d -> A/D */ + if (*after_colon == '*') { + if (*p0 == 'D') { + /* memorize "deny all" */ + flg_deny_all = 1; + } + /* skip assumed "A:*", it is a default anyway */ + continue; + } + + if (*p0 == 'A' || *p0 == 'D') { + /* storing current config IP line */ + pip = xzalloc(sizeof(Htaccess_IP)); + if (scan_ip_mask(after_colon, &(pip->ip), &(pip->mask))) { + /* IP{/mask} syntax error detected, protect all */ + *p0 = 'D'; + pip->mask = 0; + } + pip->allow_deny = *p0; + if (*p0 == 'D') { + /* Deny:from_IP - prepend */ + pip->next = ip_a_d; + ip_a_d = pip; + } else { + /* A:from_IP - append (thus D precedes A) */ + Htaccess_IP *prev_IP = ip_a_d; + if (prev_IP == NULL) { + ip_a_d = pip; + } else { + while (prev_IP->next) + prev_IP = prev_IP->next; + prev_IP->next = pip; + } + } + continue; + } + +#if ENABLE_FEATURE_HTTPD_ERROR_PAGES + if (flag == FIRST_PARSE && *p0 == 'E') { + unsigned i; + int status = atoi(++p0); /* error status code */ + if (status < HTTP_CONTINUE) { + bb_error_msg("config error '%s' in '%s'", buf, filename); + continue; + } + /* then error page; find matching status */ + for (i = 0; i < ARRAY_SIZE(http_response_type); i++) { + if (http_response_type[i] == status) { + /* We chdir to home_httpd, thus no need to + * concat_path_file(home_httpd, after_colon) + * here */ + http_error_page[i] = xstrdup(after_colon); + break; + } + } + continue; + } +#endif + +#if ENABLE_FEATURE_HTTPD_PROXY + if (flag == FIRST_PARSE && *p0 == 'P') { + /* P:/url:[http://]hostname[:port]/new/path */ + char *url_from, *host_port, *url_to; + Htaccess_Proxy *proxy_entry; + + url_from = after_colon; + host_port = strchr(after_colon, ':'); + if (host_port == NULL) { + bb_error_msg("config error '%s' in '%s'", buf, filename); + continue; + } + *host_port++ = '\0'; + if (strncmp(host_port, "http://", 7) == 0) + host_port += 7; + if (*host_port == '\0') { + bb_error_msg("config error '%s' in '%s'", buf, filename); + continue; + } + url_to = strchr(host_port, '/'); + if (url_to == NULL) { + bb_error_msg("config error '%s' in '%s'", buf, filename); + continue; + } + *url_to = '\0'; + proxy_entry = xzalloc(sizeof(Htaccess_Proxy)); + proxy_entry->url_from = xstrdup(url_from); + proxy_entry->host_port = xstrdup(host_port); + *url_to = '/'; + proxy_entry->url_to = xstrdup(url_to); + proxy_entry->next = proxy; + proxy = proxy_entry; + continue; + } +#endif + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + if (*p0 == '/') { + /* make full path from httpd root / current_path / config_line_path */ + const char *tp = (flag == SUBDIR_PARSE ? path : ""); + p0 = xmalloc(strlen(tp) + (after_colon - buf) + 2 + strlen(after_colon)); + after_colon[-1] = '\0'; + sprintf(p0, "/%s%s", tp, buf); + + /* looks like bb_simplify_path... */ + tp = p = p0; + do { + if (*p == '/') { + if (*tp == '/') { /* skip duplicate (or initial) slash */ + continue; + } + if (*tp == '.') { + if (tp[1] == '/' || tp[1] == '\0') { /* remove extra '.' */ + continue; + } + if ((tp[1] == '.') && (tp[2] == '/' || tp[2] == '\0')) { + ++tp; + if (p > p0) { + while (*--p != '/') /* omit previous dir */ + continue; + } + continue; + } + } + } + *++p = *tp; + } while (*++tp); + + if ((p == p0) || (*p != '/')) { /* not a trailing slash */ + ++p; /* so keep last character */ + } + *p = ':'; + strcpy(p + 1, after_colon); + } +#endif + if (*p0 == 'I') { + index_page = xstrdup(after_colon); + continue; + } + + /* Do not allow jumping around using H in subdir's configs */ + if (flag == FIRST_PARSE && *p0 == 'H') { + home_httpd = xstrdup(after_colon); + xchdir(home_httpd); + continue; + } + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH \ + || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \ + || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + /* storing current config line */ + cur = xzalloc(sizeof(Htaccess) + strlen(p0)); + strcpy(cur->before_colon, p0); +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + if (*p0 == '/') /* was malloced - see above */ + free(p0); +#endif + cur->after_colon = strchr(cur->before_colon, ':'); + *cur->after_colon++ = '\0'; +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES + if (cur->before_colon[0] == '.') { + /* .mime line: prepend to mime_a list */ + cur->next = mime_a; + mime_a = cur; + continue; + } +#endif +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + if (cur->before_colon[0] == '*' && cur->before_colon[1] == '.') { + /* script interpreter line: prepend to script_i list */ + cur->next = script_i; + script_i = cur; + continue; + } +#endif +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH +//TODO: we do not test for leading "/"?? +//also, do we leak cur if BASIC_AUTH is off? + if (prev == NULL) { + /* first line */ + g_auth = prev = cur; + } else { + /* sort path, if current length eq or bigger then move up */ + Htaccess *prev_hti = g_auth; + size_t l = strlen(cur->before_colon); + Htaccess *hti; + + for (hti = prev_hti; hti; hti = hti->next) { + if (l >= strlen(hti->before_colon)) { + /* insert before hti */ + cur->next = hti; + if (prev_hti != hti) { + prev_hti->next = cur; + } else { + /* insert as top */ + g_auth = cur; + } + break; + } + if (prev_hti != hti) + prev_hti = prev_hti->next; + } + if (!hti) { /* not inserted, add to bottom */ + prev->next = cur; + prev = cur; + } + } +#endif /* BASIC_AUTH */ +#endif /* BASIC_AUTH || MIME_TYPES || SCRIPT_INTERPR */ + } /* while (fgets) */ + fclose(f); +} + +#if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR +/* + * Given a string, html-encode special characters. + * This is used for the -e command line option to provide an easy way + * for scripts to encode result data without confusing browsers. The + * returned string pointer is memory allocated by malloc(). + * + * Returns a pointer to the encoded string (malloced). + */ +static char *encodeString(const char *string) +{ + /* take the simple route and encode everything */ + /* could possibly scan once to get length. */ + int len = strlen(string); + char *out = xmalloc(len * 6 + 1); + char *p = out; + char ch; + + while ((ch = *string++)) { + /* very simple check for what to encode */ + if (isalnum(ch)) + *p++ = ch; + else + p += sprintf(p, "&#%d;", (unsigned char) ch); + } + *p = '\0'; + return out; +} +#endif /* FEATURE_HTTPD_ENCODE_URL_STR */ + +/* + * Given a URL encoded string, convert it to plain ascii. + * Since decoding always makes strings smaller, the decode is done in-place. + * Thus, callers should xstrdup() the argument if they do not want the + * argument modified. The return is the original pointer, allowing this + * function to be easily used as arguments to other functions. + * + * string The first string to decode. + * option_d 1 if called for httpd -d + * + * Returns a pointer to the decoded string (same as input). + */ +static unsigned hex_to_bin(unsigned char c) +{ + unsigned v; + + v = c - '0'; + if (v <= 9) + return v; + /* c | 0x20: letters to lower case, non-letters + * to (potentially different) non-letters */ + v = (unsigned)(c | 0x20) - 'a'; + if (v <= 5) + return v + 10; + return ~0; +} +/* For testing: +void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); } +int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f'); +t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; } +*/ +static char *decodeString(char *orig, int option_d) +{ + /* note that decoded string is always shorter than original */ + char *string = orig; + char *ptr = string; + char c; + + while ((c = *ptr++) != '\0') { + unsigned v; + + if (option_d && c == '+') { + *string++ = ' '; + continue; + } + if (c != '%') { + *string++ = c; + continue; + } + v = hex_to_bin(ptr[0]); + if (v > 15) { + bad_hex: + if (!option_d) + return NULL; + *string++ = '%'; + continue; + } + v = (v * 16) | hex_to_bin(ptr[1]); + if (v > 255) + goto bad_hex; + if (!option_d && (v == '/' || v == '\0')) { + /* caller takes it as indication of invalid + * (dangerous wrt exploits) chars */ + return orig + 1; + } + *string++ = v; + ptr += 2; + } + *string = '\0'; + return orig; +} + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH +/* + * Decode a base64 data stream as per rfc1521. + * Note that the rfc states that non base64 chars are to be ignored. + * Since the decode always results in a shorter size than the input, + * it is OK to pass the input arg as an output arg. + * Parameter: a pointer to a base64 encoded string. + * Decoded data is stored in-place. + */ +static void decodeBase64(char *Data) +{ + const unsigned char *in = (const unsigned char *)Data; + /* The decoded size will be at most 3/4 the size of the encoded */ + unsigned ch = 0; + int i = 0; + + while (*in) { + int t = *in++; + + if (t >= '0' && t <= '9') + t = t - '0' + 52; + else if (t >= 'A' && t <= 'Z') + t = t - 'A'; + else if (t >= 'a' && t <= 'z') + t = t - 'a' + 26; + else if (t == '+') + t = 62; + else if (t == '/') + t = 63; + else if (t == '=') + t = 0; + else + continue; + + ch = (ch << 6) | t; + i++; + if (i == 4) { + *Data++ = (char) (ch >> 16); + *Data++ = (char) (ch >> 8); + *Data++ = (char) ch; + i = 0; + } + } + *Data = '\0'; +} +#endif + +/* + * Create a listen server socket on the designated port. + */ +static int openServer(void) +{ + unsigned n = bb_strtou(bind_addr_or_port, NULL, 10); + if (!errno && n && n <= 0xffff) + n = create_and_bind_stream_or_die(NULL, n); + else + n = create_and_bind_stream_or_die(bind_addr_or_port, 80); + xlisten(n, 9); + return n; +} + +/* + * Log the connection closure and exit. + */ +static void log_and_exit(void) NORETURN; +static void log_and_exit(void) +{ + /* Paranoia. IE said to be buggy. It may send some extra data + * or be confused by us just exiting without SHUT_WR. Oh well. */ + shutdown(1, SHUT_WR); + /* Why?? + (this also messes up stdin when user runs httpd -i from terminal) + ndelay_on(0); + while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0) + continue; + */ + + if (verbose > 2) + bb_error_msg("closed"); + _exit(xfunc_error_retval); +} + +/* + * Create and send HTTP response headers. + * The arguments are combined and sent as one write operation. Note that + * IE will puke big-time if the headers are not sent in one packet and the + * second packet is delayed for any reason. + * responseNum - the result code to send. + */ +static void send_headers(int responseNum) +{ + static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT"; + + const char *responseString = ""; + const char *infoString = NULL; + const char *mime_type; +#if ENABLE_FEATURE_HTTPD_ERROR_PAGES + const char *error_page = NULL; +#endif + unsigned i; + time_t timer = time(0); + char tmp_str[80]; + int len; + + for (i = 0; i < ARRAY_SIZE(http_response_type); i++) { + if (http_response_type[i] == responseNum) { + responseString = http_response[i].name; + infoString = http_response[i].info; +#if ENABLE_FEATURE_HTTPD_ERROR_PAGES + error_page = http_error_page[i]; +#endif + break; + } + } + /* error message is HTML */ + mime_type = responseNum == HTTP_OK ? + found_mime_type : "text/html"; + + if (verbose) + bb_error_msg("response:%u", responseNum); + + /* emit the current date */ + strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer)); + len = sprintf(iobuf, + "HTTP/1.0 %d %s\r\nContent-type: %s\r\n" + "Date: %s\r\nConnection: close\r\n", + responseNum, responseString, mime_type, tmp_str); + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + if (responseNum == HTTP_UNAUTHORIZED) { + len += sprintf(iobuf + len, + "WWW-Authenticate: Basic realm=\"%s\"\r\n", + g_realm); + } +#endif + if (responseNum == HTTP_MOVED_TEMPORARILY) { + len += sprintf(iobuf + len, "Location: %s/%s%s\r\n", + found_moved_temporarily, + (g_query ? "?" : ""), + (g_query ? g_query : "")); + } + +#if ENABLE_FEATURE_HTTPD_ERROR_PAGES + if (error_page && access(error_page, R_OK) == 0) { + strcat(iobuf, "\r\n"); + len += 2; + + if (DEBUG) + fprintf(stderr, "headers: '%s'\n", iobuf); + full_write(STDOUT_FILENO, iobuf, len); + if (DEBUG) + fprintf(stderr, "writing error page: '%s'\n", error_page); + return send_file_and_exit(error_page, SEND_BODY); + } +#endif + + if (file_size != -1) { /* file */ + strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod)); +#if ENABLE_FEATURE_HTTPD_RANGES + if (responseNum == HTTP_PARTIAL_CONTENT) { + len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n", + range_start, + range_end, + file_size); + file_size = range_end - range_start + 1; + } +#endif + len += sprintf(iobuf + len, +#if ENABLE_FEATURE_HTTPD_RANGES + "Accept-Ranges: bytes\r\n" +#endif + "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n", + tmp_str, + "Content-length:", + file_size + ); + } + iobuf[len++] = '\r'; + iobuf[len++] = '\n'; + if (infoString) { + len += sprintf(iobuf + len, + "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n" + "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n", + responseNum, responseString, + responseNum, responseString, infoString); + } + if (DEBUG) + fprintf(stderr, "headers: '%s'\n", iobuf); + if (full_write(STDOUT_FILENO, iobuf, len) != len) { + if (verbose > 1) + bb_perror_msg("error"); + log_and_exit(); + } +} + +static void send_headers_and_exit(int responseNum) NORETURN; +static void send_headers_and_exit(int responseNum) +{ + send_headers(responseNum); + log_and_exit(); +} + +/* + * Read from the socket until '\n' or EOF. '\r' chars are removed. + * '\n' is replaced with NUL. + * Return number of characters read or 0 if nothing is read + * ('\r' and '\n' are not counted). + * Data is returned in iobuf. + */ +static int get_line(void) +{ + int count = 0; + char c; + + while (1) { + if (hdr_cnt <= 0) { + hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf)); + if (hdr_cnt <= 0) + break; + hdr_ptr = hdr_buf; + } + iobuf[count] = c = *hdr_ptr++; + hdr_cnt--; + + if (c == '\r') + continue; + if (c == '\n') { + iobuf[count] = '\0'; + return count; + } + if (count < (IOBUF_SIZE - 1)) /* check overflow */ + count++; + } + return count; +} + +#if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY + +/* gcc 4.2.1 fares better with NOINLINE */ +static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN; +static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) +{ + enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */ + struct pollfd pfd[3]; + int out_cnt; /* we buffer a bit of initial CGI output */ + int count; + + /* iobuf is used for CGI -> network data, + * hdr_buf is for network -> CGI data (POSTDATA) */ + + /* If CGI dies, we still want to correctly finish reading its output + * and send it to the peer. So please no SIGPIPEs! */ + signal(SIGPIPE, SIG_IGN); + + // We inconsistently handle a case when more POSTDATA from network + // is coming than we expected. We may give *some part* of that + // extra data to CGI. + + //if (hdr_cnt > post_len) { + // /* We got more POSTDATA from network than we expected */ + // hdr_cnt = post_len; + //} + post_len -= hdr_cnt; + /* post_len - number of POST bytes not yet read from network */ + + /* NB: breaking out of this loop jumps to log_and_exit() */ + out_cnt = 0; + while (1) { + memset(pfd, 0, sizeof(pfd)); + + pfd[FROM_CGI].fd = fromCgi_rd; + pfd[FROM_CGI].events = POLLIN; + + if (toCgi_wr) { + pfd[TO_CGI].fd = toCgi_wr; + if (hdr_cnt > 0) { + pfd[TO_CGI].events = POLLOUT; + } else if (post_len > 0) { + pfd[0].events = POLLIN; + } else { + /* post_len <= 0 && hdr_cnt <= 0: + * no more POST data to CGI, + * let CGI see EOF on CGI's stdin */ + close(toCgi_wr); + toCgi_wr = 0; + } + } + + /* Now wait on the set of sockets */ + count = safe_poll(pfd, 3, -1); + if (count <= 0) { +#if 0 + if (safe_waitpid(pid, &status, WNOHANG) <= 0) { + /* Weird. CGI didn't exit and no fd's + * are ready, yet poll returned?! */ + continue; + } + if (DEBUG && WIFEXITED(status)) + bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status)); + if (DEBUG && WIFSIGNALED(status)) + bb_error_msg("CGI killed, signal=%d", WTERMSIG(status)); +#endif + break; + } + + if (pfd[TO_CGI].revents) { + /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */ + /* Have data from peer and can write to CGI */ + count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt); + /* Doesn't happen, we dont use nonblocking IO here + *if (count < 0 && errno == EAGAIN) { + * ... + *} else */ + if (count > 0) { + hdr_ptr += count; + hdr_cnt -= count; + } else { + /* EOF/broken pipe to CGI, stop piping POST data */ + hdr_cnt = post_len = 0; + } + } + + if (pfd[0].revents) { + /* post_len > 0 && hdr_cnt == 0 here */ + /* We expect data, prev data portion is eaten by CGI + * and there *is* data to read from the peer + * (POSTDATA) */ + //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len; + //count = safe_read(STDIN_FILENO, hdr_buf, count); + count = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf)); + if (count > 0) { + hdr_cnt = count; + hdr_ptr = hdr_buf; + post_len -= count; + } else { + /* no more POST data can be read */ + post_len = 0; + } + } + + if (pfd[FROM_CGI].revents) { + /* There is something to read from CGI */ + char *rbuf = iobuf; + + /* Are we still buffering CGI output? */ + if (out_cnt >= 0) { + /* HTTP_200[] has single "\r\n" at the end. + * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html, + * CGI scripts MUST send their own header terminated by + * empty line, then data. That's why we have only one + * <cr><lf> pair here. We will output "200 OK" line + * if needed, but CGI still has to provide blank line + * between header and body */ + + /* Must use safe_read, not full_read, because + * CGI may output a few first bytes and then wait + * for POSTDATA without closing stdout. + * With full_read we may wait here forever. */ + count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8); + if (count <= 0) { + /* eof (or error) and there was no "HTTP", + * so write it, then write received data */ + if (out_cnt) { + full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1); + full_write(STDOUT_FILENO, rbuf, out_cnt); + } + break; /* CGI stdout is closed, exiting */ + } + out_cnt += count; + count = 0; + /* "Status" header format is: "Status: 302 Redirected\r\n" */ + if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) { + /* send "HTTP/1.0 " */ + if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9) + break; + rbuf += 8; /* skip "Status: " */ + count = out_cnt - 8; + out_cnt = -1; /* buffering off */ + } else if (out_cnt >= 4) { + /* Did CGI add "HTTP"? */ + if (memcmp(rbuf, HTTP_200, 4) != 0) { + /* there is no "HTTP", do it ourself */ + if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1) + break; + } + /* Commented out: + if (!strstr(rbuf, "ontent-")) { + full_write(s, "Content-type: text/plain\r\n\r\n", 28); + } + * Counter-example of valid CGI without Content-type: + * echo -en "HTTP/1.0 302 Found\r\n" + * echo -en "Location: http://www.busybox.net\r\n" + * echo -en "\r\n" + */ + count = out_cnt; + out_cnt = -1; /* buffering off */ + } + } else { + count = safe_read(fromCgi_rd, rbuf, PIPE_BUF); + if (count <= 0) + break; /* eof (or error) */ + } + if (full_write(STDOUT_FILENO, rbuf, count) != count) + break; + if (DEBUG) + fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf); + } /* if (pfd[FROM_CGI].revents) */ + } /* while (1) */ + log_and_exit(); +} +#endif + +#if ENABLE_FEATURE_HTTPD_CGI + +static void setenv1(const char *name, const char *value) +{ + setenv(name, value ? value : "", 1); +} + +/* + * Spawn CGI script, forward CGI's stdin/out <=> network + * + * Environment variables are set up and the script is invoked with pipes + * for stdin/stdout. If a POST is being done the script is fed the POST + * data in addition to setting the QUERY_STRING variable (for GETs or POSTs). + * + * Parameters: + * const char *url The requested URL (with leading /). + * int post_len Length of the POST body. + * const char *cookie For set HTTP_COOKIE. + * const char *content_type For set CONTENT_TYPE. + */ +static void send_cgi_and_exit( + const char *url, + const char *request, + int post_len, + const char *cookie, + const char *content_type) NORETURN; +static void send_cgi_and_exit( + const char *url, + const char *request, + int post_len, + const char *cookie, + const char *content_type) +{ + struct fd_pair fromCgi; /* CGI -> httpd pipe */ + struct fd_pair toCgi; /* httpd -> CGI pipe */ + char *script; + int pid; + + /* Make a copy. NB: caller guarantees: + * url[0] == '/', url[1] != '/' */ + url = xstrdup(url); + + /* + * We are mucking with environment _first_ and then vfork/exec, + * this allows us to use vfork safely. Parent doesn't care about + * these environment changes anyway. + */ + + /* Check for [dirs/]script.cgi/PATH_INFO */ + script = (char*)url; + while ((script = strchr(script + 1, '/')) != NULL) { + struct stat sb; + + *script = '\0'; + if (!is_directory(url + 1, 1, &sb)) { + /* not directory, found script.cgi/PATH_INFO */ + *script = '/'; + break; + } + *script = '/'; /* is directory, find next '/' */ + } + setenv1("PATH_INFO", script); /* set to /PATH_INFO or "" */ + setenv1("REQUEST_METHOD", request); + if (g_query) { + putenv(xasprintf("%s=%s?%s", "REQUEST_URI", url, g_query)); + } else { + setenv1("REQUEST_URI", url); + } + if (script != NULL) + *script = '\0'; /* cut off /PATH_INFO */ + + /* SCRIPT_FILENAME is required by PHP in CGI mode */ + if (home_httpd[0] == '/') { + char *fullpath = concat_path_file(home_httpd, url); + setenv1("SCRIPT_FILENAME", fullpath); + } + /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */ + setenv1("SCRIPT_NAME", url); + /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html: + * QUERY_STRING: The information which follows the ? in the URL + * which referenced this script. This is the query information. + * It should not be decoded in any fashion. This variable + * should always be set when there is query information, + * regardless of command line decoding. */ + /* (Older versions of bbox seem to do some decoding) */ + setenv1("QUERY_STRING", g_query); + putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER); + putenv((char*)"SERVER_PROTOCOL=HTTP/1.0"); + putenv((char*)"GATEWAY_INTERFACE=CGI/1.1"); + /* Having _separate_ variables for IP and port defeats + * the purpose of having socket abstraction. Which "port" + * are you using on Unix domain socket? + * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense. + * Oh well... */ + { + char *p = rmt_ip_str ? rmt_ip_str : (char*)""; + char *cp = strrchr(p, ':'); + if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']')) + cp = NULL; + if (cp) *cp = '\0'; /* delete :PORT */ + setenv1("REMOTE_ADDR", p); + if (cp) { + *cp = ':'; +#if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV + setenv1("REMOTE_PORT", cp + 1); +#endif + } + } + setenv1("HTTP_USER_AGENT", user_agent); + if (http_accept) + setenv1("HTTP_ACCEPT", http_accept); + if (http_accept_language) + setenv1("HTTP_ACCEPT_LANGUAGE", http_accept_language); + if (post_len) + putenv(xasprintf("CONTENT_LENGTH=%d", post_len)); + if (cookie) + setenv1("HTTP_COOKIE", cookie); + if (content_type) + setenv1("CONTENT_TYPE", content_type); +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + if (remoteuser) { + setenv1("REMOTE_USER", remoteuser); + putenv((char*)"AUTH_TYPE=Basic"); + } +#endif + if (referer) + setenv1("HTTP_REFERER", referer); + + xpiped_pair(fromCgi); + xpiped_pair(toCgi); + + pid = vfork(); + if (pid < 0) { + /* TODO: log perror? */ + log_and_exit(); + } + + if (!pid) { + /* Child process */ + char *argv[3]; + + xfunc_error_retval = 242; + + /* NB: close _first_, then move fds! */ + close(toCgi.wr); + close(fromCgi.rd); + xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */ + xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */ + /* User seeing stderr output can be a security problem. + * If CGI really wants that, it can always do dup itself. */ + /* dup2(1, 2); */ + + /* Chdiring to script's dir */ + script = strrchr(url, '/'); + if (script != url) { /* paranoia */ + *script = '\0'; + if (chdir(url + 1) != 0) { + bb_perror_msg("chdir %s", url + 1); + goto error_execing_cgi; + } + // not needed: *script = '/'; + } + script++; + + /* set argv[0] to name without path */ + argv[0] = script; + argv[1] = NULL; + +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + { + char *suffix = strrchr(script, '.'); + + if (suffix) { + Htaccess *cur; + for (cur = script_i; cur; cur = cur->next) { + if (strcmp(cur->before_colon + 1, suffix) == 0) { + /* found interpreter name */ + argv[0] = cur->after_colon; + argv[1] = script; + argv[2] = NULL; + break; + } + } + } + } +#endif + /* restore default signal dispositions for CGI process */ + bb_signals(0 + | (1 << SIGCHLD) + | (1 << SIGPIPE) + | (1 << SIGHUP) + , SIG_DFL); + + /* _NOT_ execvp. We do not search PATH. argv[0] is a filename + * without any dir components and will only match a file + * in the current directory */ + execv(argv[0], argv); + if (verbose) + bb_perror_msg("exec %s", argv[0]); + error_execing_cgi: + /* send to stdout + * (we are CGI here, our stdout is pumped to the net) */ + send_headers_and_exit(HTTP_NOT_FOUND); + } /* end child */ + + /* Parent process */ + + /* Restore variables possibly changed by child */ + xfunc_error_retval = 0; + + /* Pump data */ + close(fromCgi.wr); + close(toCgi.rd); + cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len); +} + +#endif /* FEATURE_HTTPD_CGI */ + +/* + * Send a file response to a HTTP request, and exit + * + * Parameters: + * const char *url The requested URL (with leading /). + * what What to send (headers/body/both). + */ +static void send_file_and_exit(const char *url, int what) +{ + static const char *const suffixTable[] = { + /* Warning: shorter equivalent suffix in one line must be first */ + ".htm.html", "text/html", + ".jpg.jpeg", "image/jpeg", + ".gif", "image/gif", + ".png", "image/png", + ".txt.h.c.cc.cpp", "text/plain", + ".css", "text/css", + ".wav", "audio/wav", + ".avi", "video/x-msvideo", + ".qt.mov", "video/quicktime", + ".mpe.mpeg", "video/mpeg", + ".mid.midi", "audio/midi", + ".mp3", "audio/mpeg", +#if 0 /* unpopular */ + ".au", "audio/basic", + ".pac", "application/x-ns-proxy-autoconfig", + ".vrml.wrl", "model/vrml", +#endif + NULL + }; + + char *suffix; + int f; + const char *const *table; + const char *try_suffix; + ssize_t count; +#if ENABLE_FEATURE_HTTPD_USE_SENDFILE + off_t offset; +#endif + + /* If you want to know about EPIPE below + * (happens if you abort downloads from local httpd): */ + signal(SIGPIPE, SIG_IGN); + + suffix = strrchr(url, '.'); + + /* If not found, set default as "application/octet-stream"; */ + found_mime_type = "application/octet-stream"; + if (suffix) { +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES + Htaccess *cur; +#endif + for (table = suffixTable; *table; table += 2) { + try_suffix = strstr(table[0], suffix); + if (try_suffix) { + try_suffix += strlen(suffix); + if (*try_suffix == '\0' || *try_suffix == '.') { + found_mime_type = table[1]; + break; + } + } + } +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES + for (cur = mime_a; cur; cur = cur->next) { + if (strcmp(cur->before_colon, suffix) == 0) { + found_mime_type = cur->after_colon; + break; + } + } +#endif + } + + if (DEBUG) + bb_error_msg("sending file '%s' content-type: %s", + url, found_mime_type); + + f = open(url, O_RDONLY); + if (f < 0) { + if (DEBUG) + bb_perror_msg("can't open '%s'", url); + /* Error pages are sent by using send_file_and_exit(SEND_BODY). + * IOW: it is unsafe to call send_headers_and_exit + * if what is SEND_BODY! Can recurse! */ + if (what != SEND_BODY) + send_headers_and_exit(HTTP_NOT_FOUND); + log_and_exit(); + } +#if ENABLE_FEATURE_HTTPD_RANGES + if (what == SEND_BODY) + range_start = 0; /* err pages and ranges don't mix */ + range_len = MAXINT(off_t); + if (range_start) { + if (!range_end) { + range_end = file_size - 1; + } + if (range_end < range_start + || lseek(f, range_start, SEEK_SET) != range_start + ) { + lseek(f, 0, SEEK_SET); + range_start = 0; + } else { + range_len = range_end - range_start + 1; + send_headers(HTTP_PARTIAL_CONTENT); + what = SEND_BODY; + } + } +#endif + + if (what & SEND_HEADERS) + send_headers(HTTP_OK); + +#if ENABLE_FEATURE_HTTPD_USE_SENDFILE + offset = range_start; + do { + /* sz is rounded down to 64k */ + ssize_t sz = MAXINT(ssize_t) - 0xffff; + USE_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;) + count = sendfile(1, f, &offset, sz); + if (count < 0) { + if (offset == range_start) + goto fallback; + goto fin; + } + USE_FEATURE_HTTPD_RANGES(range_len -= sz;) + } while (count > 0 && range_len); + log_and_exit(); + + fallback: +#endif + while ((count = safe_read(f, iobuf, IOBUF_SIZE)) > 0) { + ssize_t n; + USE_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;) + n = full_write(STDOUT_FILENO, iobuf, count); + if (count != n) + break; + USE_FEATURE_HTTPD_RANGES(range_len -= count;) + if (!range_len) + break; + } +#if ENABLE_FEATURE_HTTPD_USE_SENDFILE + fin: +#endif + if (count < 0 && verbose > 1) + bb_perror_msg("error"); + log_and_exit(); +} + +static int checkPermIP(void) +{ + Htaccess_IP *cur; + + for (cur = ip_a_d; cur; cur = cur->next) { +#if DEBUG + fprintf(stderr, + "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n", + rmt_ip_str, + (unsigned char)(cur->ip >> 24), + (unsigned char)(cur->ip >> 16), + (unsigned char)(cur->ip >> 8), + (unsigned char)(cur->ip), + (unsigned char)(cur->mask >> 24), + (unsigned char)(cur->mask >> 16), + (unsigned char)(cur->mask >> 8), + (unsigned char)(cur->mask) + ); +#endif + if ((rmt_ip & cur->mask) == cur->ip) + return (cur->allow_deny == 'A'); /* A -> 1 */ + } + + return !flg_deny_all; /* depends on whether we saw "D:*" */ +} + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH +/* + * Config file entries are of the form "/<path>:<user>:<passwd>". + * If config file has no prefix match for path, access is allowed. + * + * path The file path + * user_and_passwd "user:passwd" to validate + * + * Returns 1 if user_and_passwd is OK. + */ +static int check_user_passwd(const char *path, const char *user_and_passwd) +{ + Htaccess *cur; + const char *prev = NULL; + + for (cur = g_auth; cur; cur = cur->next) { + const char *dir_prefix; + size_t len; + + dir_prefix = cur->before_colon; + + /* WHY? */ + /* If already saw a match, don't accept other different matches */ + if (prev && strcmp(prev, dir_prefix) != 0) + continue; + + if (DEBUG) + fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd); + + /* If it's not a prefix match, continue searching */ + len = strlen(dir_prefix); + if (len != 1 /* dir_prefix "/" matches all, don't need to check */ + && (strncmp(dir_prefix, path, len) != 0 + || (path[len] != '/' && path[len] != '\0')) + ) { + continue; + } + + /* Path match found */ + prev = dir_prefix; + + if (ENABLE_FEATURE_HTTPD_AUTH_MD5) { + char *md5_passwd; + + md5_passwd = strchr(cur->after_colon, ':'); + if (md5_passwd && md5_passwd[1] == '$' && md5_passwd[2] == '1' + && md5_passwd[3] == '$' && md5_passwd[4] + ) { + char *encrypted; + int r, user_len_p1; + + md5_passwd++; + user_len_p1 = md5_passwd - cur->after_colon; + /* comparing "user:" */ + if (strncmp(cur->after_colon, user_and_passwd, user_len_p1) != 0) { + continue; + } + + encrypted = pw_encrypt( + user_and_passwd + user_len_p1 /* cleartext pwd from user */, + md5_passwd /*salt */, 1 /* cleanup */); + r = strcmp(encrypted, md5_passwd); + free(encrypted); + if (r == 0) + goto set_remoteuser_var; /* Ok */ + continue; + } + } + + /* Comparing plaintext "user:pass" in one go */ + if (strcmp(cur->after_colon, user_and_passwd) == 0) { + set_remoteuser_var: + remoteuser = xstrndup(user_and_passwd, + strchrnul(user_and_passwd, ':') - user_and_passwd); + return 1; /* Ok */ + } + } /* for */ + + /* 0(bad) if prev is set: matches were found but passwd was wrong */ + return (prev == NULL); +} +#endif /* FEATURE_HTTPD_BASIC_AUTH */ + +#if ENABLE_FEATURE_HTTPD_PROXY +static Htaccess_Proxy *find_proxy_entry(const char *url) +{ + Htaccess_Proxy *p; + for (p = proxy; p; p = p->next) { + if (strncmp(url, p->url_from, strlen(p->url_from)) == 0) + return p; + } + return NULL; +} +#endif + +/* + * Handle timeouts + */ +static void exit_on_signal(int sig) NORETURN; +static void exit_on_signal(int sig UNUSED_PARAM) +{ + send_headers_and_exit(HTTP_REQUEST_TIMEOUT); +} + +/* + * Handle an incoming http request and exit. + */ +static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN; +static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) +{ + static const char request_GET[] ALIGN1 = "GET"; + struct stat sb; + char *urlcopy; + char *urlp; + char *tptr; +#if ENABLE_FEATURE_HTTPD_CGI + static const char request_HEAD[] ALIGN1 = "HEAD"; + const char *prequest; + char *cookie = NULL; + char *content_type = NULL; + unsigned long length = 0; +#elif ENABLE_FEATURE_HTTPD_PROXY +#define prequest request_GET + unsigned long length = 0; +#endif +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + smallint authorized = -1; +#endif + smallint ip_allowed; + char http_major_version; +#if ENABLE_FEATURE_HTTPD_PROXY + char http_minor_version; + char *header_buf = header_buf; /* for gcc */ + char *header_ptr = header_ptr; + Htaccess_Proxy *proxy_entry; +#endif + + /* Allocation of iobuf is postponed until now + * (IOW, server process doesn't need to waste 8k) */ + iobuf = xmalloc(IOBUF_SIZE); + + rmt_ip = 0; + if (fromAddr->u.sa.sa_family == AF_INET) { + rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr); + } +#if ENABLE_FEATURE_IPV6 + if (fromAddr->u.sa.sa_family == AF_INET6 + && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0 + && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0 + && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff) + rmt_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]); +#endif + if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) { + /* NB: can be NULL (user runs httpd -i by hand?) */ + rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa); + } + if (verbose) { + /* this trick makes -v logging much simpler */ + if (rmt_ip_str) + applet_name = rmt_ip_str; + if (verbose > 2) + bb_error_msg("connected"); + } + + /* Install timeout handler */ + signal_no_SA_RESTART_empty_mask(SIGALRM, exit_on_signal); + alarm(HEADER_READ_TIMEOUT); + + if (!get_line()) /* EOF or error or empty line */ + send_headers_and_exit(HTTP_BAD_REQUEST); + + /* Determine type of request (GET/POST) */ + urlp = strpbrk(iobuf, " \t"); + if (urlp == NULL) + send_headers_and_exit(HTTP_BAD_REQUEST); + *urlp++ = '\0'; +#if ENABLE_FEATURE_HTTPD_CGI + prequest = request_GET; + if (strcasecmp(iobuf, prequest) != 0) { + prequest = request_HEAD; + if (strcasecmp(iobuf, prequest) != 0) { + prequest = "POST"; + if (strcasecmp(iobuf, prequest) != 0) + send_headers_and_exit(HTTP_NOT_IMPLEMENTED); + } + } +#else + if (strcasecmp(iobuf, request_GET) != 0) + send_headers_and_exit(HTTP_NOT_IMPLEMENTED); +#endif + urlp = skip_whitespace(urlp); + if (urlp[0] != '/') + send_headers_and_exit(HTTP_BAD_REQUEST); + + /* Find end of URL and parse HTTP version, if any */ + http_major_version = '0'; + USE_FEATURE_HTTPD_PROXY(http_minor_version = '0';) + tptr = strchrnul(urlp, ' '); + /* Is it " HTTP/"? */ + if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) { + http_major_version = tptr[6]; + USE_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];) + } + *tptr = '\0'; + + /* Copy URL from after "GET "/"POST " to stack-allocated char[] */ + urlcopy = alloca((tptr - urlp) + 2 + strlen(index_page)); + /*if (urlcopy == NULL) + * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/ + strcpy(urlcopy, urlp); + /* NB: urlcopy ptr is never changed after this */ + + /* Extract url args if present */ + g_query = NULL; + tptr = strchr(urlcopy, '?'); + if (tptr) { + *tptr++ = '\0'; + g_query = tptr; + } + + /* Decode URL escape sequences */ + tptr = decodeString(urlcopy, 0); + if (tptr == NULL) + send_headers_and_exit(HTTP_BAD_REQUEST); + if (tptr == urlcopy + 1) { + /* '/' or NUL is encoded */ + send_headers_and_exit(HTTP_NOT_FOUND); + } + + /* Canonicalize path */ + /* Algorithm stolen from libbb bb_simplify_path(), + * but don't strdup, retain trailing slash, protect root */ + urlp = tptr = urlcopy; + do { + if (*urlp == '/') { + /* skip duplicate (or initial) slash */ + if (*tptr == '/') { + continue; + } + if (*tptr == '.') { + /* skip extra "/./" */ + if (tptr[1] == '/' || !tptr[1]) { + continue; + } + /* "..": be careful */ + if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) { + ++tptr; + if (urlp == urlcopy) /* protect root */ + send_headers_and_exit(HTTP_BAD_REQUEST); + while (*--urlp != '/') /* omit previous dir */; + continue; + } + } + } + *++urlp = *tptr; + } while (*++tptr); + *++urlp = '\0'; /* terminate after last character */ + + /* If URL is a directory, add '/' */ + if (urlp[-1] != '/') { + if (is_directory(urlcopy + 1, 1, &sb)) { + found_moved_temporarily = urlcopy; + } + } + + /* Log it */ + if (verbose > 1) + bb_error_msg("url:%s", urlcopy); + + tptr = urlcopy; + ip_allowed = checkPermIP(); + while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) { + /* have path1/path2 */ + *tptr = '\0'; + if (is_directory(urlcopy + 1, 1, &sb)) { + /* may have subdir config */ + parse_conf(urlcopy + 1, SUBDIR_PARSE); + ip_allowed = checkPermIP(); + } + *tptr = '/'; + } + +#if ENABLE_FEATURE_HTTPD_PROXY + proxy_entry = find_proxy_entry(urlcopy); + if (proxy_entry) + header_buf = header_ptr = xmalloc(IOBUF_SIZE); +#endif + + if (http_major_version >= '0') { + /* Request was with "... HTTP/nXXX", and n >= 0 */ + + /* Read until blank line for HTTP version specified, else parse immediate */ + while (1) { + alarm(HEADER_READ_TIMEOUT); + if (!get_line()) + break; /* EOF or error or empty line */ + if (DEBUG) + bb_error_msg("header: '%s'", iobuf); + +#if ENABLE_FEATURE_HTTPD_PROXY + /* We need 2 more bytes for yet another "\r\n" - + * see near fdprintf(proxy_fd...) further below */ + if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) { + int len = strlen(iobuf); + if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4) + len = IOBUF_SIZE - (header_ptr - header_buf) - 4; + memcpy(header_ptr, iobuf, len); + header_ptr += len; + header_ptr[0] = '\r'; + header_ptr[1] = '\n'; + header_ptr += 2; + } +#endif + +#if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY + /* Try and do our best to parse more lines */ + if ((STRNCASECMP(iobuf, "Content-length:") == 0)) { + /* extra read only for POST */ + if (prequest != request_GET +#if ENABLE_FEATURE_HTTPD_CGI + && prequest != request_HEAD +#endif + ) { + tptr = skip_whitespace(iobuf + sizeof("Content-length:") - 1); + if (!tptr[0]) + send_headers_and_exit(HTTP_BAD_REQUEST); + /* not using strtoul: it ignores leading minus! */ + length = bb_strtou(tptr, NULL, 10); + /* length is "ulong", but we need to pass it to int later */ + if (errno || length > INT_MAX) + send_headers_and_exit(HTTP_BAD_REQUEST); + } + } +#endif +#if ENABLE_FEATURE_HTTPD_CGI + else if (STRNCASECMP(iobuf, "Cookie:") == 0) { + cookie = xstrdup(skip_whitespace(iobuf + sizeof("Cookie:")-1)); + } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) { + content_type = xstrdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1)); + } else if (STRNCASECMP(iobuf, "Referer:") == 0) { + referer = xstrdup(skip_whitespace(iobuf + sizeof("Referer:")-1)); + } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) { + user_agent = xstrdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1)); + } else if (STRNCASECMP(iobuf, "Accept:") == 0) { + http_accept = xstrdup(skip_whitespace(iobuf + sizeof("Accept:")-1)); + } else if (STRNCASECMP(iobuf, "Accept-Language:") == 0) { + http_accept_language = xstrdup(skip_whitespace(iobuf + sizeof("Accept-Language:")-1)); + } +#endif +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + if (STRNCASECMP(iobuf, "Authorization:") == 0) { + /* We only allow Basic credentials. + * It shows up as "Authorization: Basic <user>:<passwd>" where + * "<user>:<passwd>" is base64 encoded. + */ + tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1); + if (STRNCASECMP(tptr, "Basic") != 0) + continue; + tptr += sizeof("Basic")-1; + /* decodeBase64() skips whitespace itself */ + decodeBase64(tptr); + authorized = check_user_passwd(urlcopy, tptr); + } +#endif +#if ENABLE_FEATURE_HTTPD_RANGES + if (STRNCASECMP(iobuf, "Range:") == 0) { + /* We know only bytes=NNN-[MMM] */ + char *s = skip_whitespace(iobuf + sizeof("Range:")-1); + if (strncmp(s, "bytes=", 6) == 0) { + s += sizeof("bytes=")-1; + range_start = BB_STRTOOFF(s, &s, 10); + if (s[0] != '-' || range_start < 0) { + range_start = 0; + } else if (s[1]) { + range_end = BB_STRTOOFF(s+1, NULL, 10); + if (errno || range_end < range_start) + range_start = 0; + } + } + } +#endif + } /* while extra header reading */ + } + + /* We are done reading headers, disable peer timeout */ + alarm(0); + + if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || !ip_allowed) { + /* protect listing [/path]/httpd_conf or IP deny */ + send_headers_and_exit(HTTP_FORBIDDEN); + } + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + /* Case: no "Authorization:" was seen, but page does require passwd. + * Check that with dummy user:pass */ + if (authorized < 0) + authorized = check_user_passwd(urlcopy, ":"); + if (!authorized) + send_headers_and_exit(HTTP_UNAUTHORIZED); +#endif + + if (found_moved_temporarily) { + send_headers_and_exit(HTTP_MOVED_TEMPORARILY); + } + +#if ENABLE_FEATURE_HTTPD_PROXY + if (proxy_entry != NULL) { + int proxy_fd; + len_and_sockaddr *lsa; + + proxy_fd = socket(AF_INET, SOCK_STREAM, 0); + if (proxy_fd < 0) + send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); + lsa = host2sockaddr(proxy_entry->host_port, 80); + if (lsa == NULL) + send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); + if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0) + send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); + fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n", + prequest, /* GET or POST */ + proxy_entry->url_to, /* url part 1 */ + urlcopy + strlen(proxy_entry->url_from), /* url part 2 */ + (g_query ? "?" : ""), /* "?" (maybe) */ + (g_query ? g_query : ""), /* query string (maybe) */ + http_major_version, http_minor_version); + header_ptr[0] = '\r'; + header_ptr[1] = '\n'; + header_ptr += 2; + write(proxy_fd, header_buf, header_ptr - header_buf); + free(header_buf); /* on the order of 8k, free it */ + /* cgi_io_loop_and_exit needs to have two disctinct fds */ + cgi_io_loop_and_exit(proxy_fd, dup(proxy_fd), length); + } +#endif + + tptr = urlcopy + 1; /* skip first '/' */ + +#if ENABLE_FEATURE_HTTPD_CGI + if (strncmp(tptr, "cgi-bin/", 8) == 0) { + if (tptr[8] == '\0') { + /* protect listing "cgi-bin/" */ + send_headers_and_exit(HTTP_FORBIDDEN); + } + send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type); + } +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + { + char *suffix = strrchr(tptr, '.'); + if (suffix) { + Htaccess *cur; + for (cur = script_i; cur; cur = cur->next) { + if (strcmp(cur->before_colon + 1, suffix) == 0) { + send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type); + } + } + } + } +#endif + if (prequest != request_GET && prequest != request_HEAD) { + send_headers_and_exit(HTTP_NOT_IMPLEMENTED); + } +#endif /* FEATURE_HTTPD_CGI */ + + if (urlp[-1] == '/') + strcpy(urlp, index_page); + if (stat(tptr, &sb) == 0) { + file_size = sb.st_size; + last_mod = sb.st_mtime; + } +#if ENABLE_FEATURE_HTTPD_CGI + else if (urlp[-1] == '/') { + /* It's a dir URL and there is no index.html + * Try cgi-bin/index.cgi */ + if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) { + urlp[0] = '\0'; + g_query = urlcopy; + send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type); + } + } +#endif + /* else { + * fall through to send_file, it errors out if open fails + * } + */ + + send_file_and_exit(tptr, +#if ENABLE_FEATURE_HTTPD_CGI + (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS) +#else + SEND_HEADERS_AND_BODY +#endif + ); +} + +/* + * The main http server function. + * Given a socket, listen for new connections and farm out + * the processing as a [v]forked process. + * Never returns. + */ +#if BB_MMU +static void mini_httpd(int server_socket) NORETURN; +static void mini_httpd(int server_socket) +{ + /* NB: it's best to not use xfuncs in this loop before fork(). + * Otherwise server may die on transient errors (temporary + * out-of-memory condition, etc), which is Bad(tm). + * Try to do any dangerous calls after fork. + */ + while (1) { + int n; + len_and_sockaddr fromAddr; + + /* Wait for connections... */ + fromAddr.len = LSA_SIZEOF_SA; + n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len); + + if (n < 0) + continue; + /* set the KEEPALIVE option to cull dead connections */ + setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1)); + + if (fork() == 0) { + /* child */ +#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP + /* Do not reload config on HUP */ + signal(SIGHUP, SIG_IGN); +#endif + close(server_socket); + xmove_fd(n, 0); + xdup2(0, 1); + + handle_incoming_and_exit(&fromAddr); + } + /* parent, or fork failed */ + close(n); + } /* while (1) */ + /* never reached */ +} +#else +static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN; +static void mini_httpd_nommu(int server_socket, int argc, char **argv) +{ + char *argv_copy[argc + 2]; + + argv_copy[0] = argv[0]; + argv_copy[1] = (char*)"-i"; + memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0])); + + /* NB: it's best to not use xfuncs in this loop before vfork(). + * Otherwise server may die on transient errors (temporary + * out-of-memory condition, etc), which is Bad(tm). + * Try to do any dangerous calls after fork. + */ + while (1) { + int n; + len_and_sockaddr fromAddr; + + /* Wait for connections... */ + fromAddr.len = LSA_SIZEOF_SA; + n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len); + + if (n < 0) + continue; + /* set the KEEPALIVE option to cull dead connections */ + setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1)); + + if (vfork() == 0) { + /* child */ +#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP + /* Do not reload config on HUP */ + signal(SIGHUP, SIG_IGN); +#endif + close(server_socket); + xmove_fd(n, 0); + xdup2(0, 1); + + /* Run a copy of ourself in inetd mode */ + re_exec(argv_copy); + } + /* parent, or vfork failed */ + close(n); + } /* while (1) */ + /* never reached */ +} +#endif + +/* + * Process a HTTP connection on stdin/out. + * Never returns. + */ +static void mini_httpd_inetd(void) NORETURN; +static void mini_httpd_inetd(void) +{ + len_and_sockaddr fromAddr; + + memset(&fromAddr, 0, sizeof(fromAddr)); + fromAddr.len = LSA_SIZEOF_SA; + /* NB: can fail if user runs it by hand and types in http cmds */ + getpeername(0, &fromAddr.u.sa, &fromAddr.len); + handle_incoming_and_exit(&fromAddr); +} + +#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP +static void sighup_handler(int sig) +{ + parse_conf(default_path_httpd_conf, sig ? SIGNALED_PARSE : FIRST_PARSE); + signal_SA_RESTART_empty_mask(SIGHUP, sighup_handler); +} +#endif + +enum { + c_opt_config_file = 0, + d_opt_decode_url, + h_opt_home_httpd, + USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,) + USE_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,) + USE_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,) + USE_FEATURE_HTTPD_SETUID( u_opt_setuid ,) + p_opt_port , + p_opt_inetd , + p_opt_foreground, + p_opt_verbose , + OPT_CONFIG_FILE = 1 << c_opt_config_file, + OPT_DECODE_URL = 1 << d_opt_decode_url, + OPT_HOME_HTTPD = 1 << h_opt_home_httpd, + OPT_ENCODE_URL = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0, + OPT_REALM = USE_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0, + OPT_MD5 = USE_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0, + OPT_SETUID = USE_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0, + OPT_PORT = 1 << p_opt_port, + OPT_INETD = 1 << p_opt_inetd, + OPT_FOREGROUND = 1 << p_opt_foreground, + OPT_VERBOSE = 1 << p_opt_verbose, +}; + + +int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; +int httpd_main(int argc UNUSED_PARAM, char **argv) +{ + int server_socket = server_socket; /* for gcc */ + unsigned opt; + char *url_for_decode; + USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;) + USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;) + USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;) + USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;) + + INIT_G(); + +#if ENABLE_LOCALE_SUPPORT + /* Undo busybox.c: we want to speak English in http (dates etc) */ + setlocale(LC_TIME, "C"); +#endif + + home_httpd = xrealloc_getcwd_or_warn(NULL); + /* -v counts, -i implies -f */ + opt_complementary = "vv:if"; + /* We do not "absolutize" path given by -h (home) opt. + * If user gives relative path in -h, + * $SCRIPT_FILENAME will not be set. */ + opt = getopt32(argv, "c:d:h:" + USE_FEATURE_HTTPD_ENCODE_URL_STR("e:") + USE_FEATURE_HTTPD_BASIC_AUTH("r:") + USE_FEATURE_HTTPD_AUTH_MD5("m:") + USE_FEATURE_HTTPD_SETUID("u:") + "p:ifv", + &configFile, &url_for_decode, &home_httpd + USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode) + USE_FEATURE_HTTPD_BASIC_AUTH(, &g_realm) + USE_FEATURE_HTTPD_AUTH_MD5(, &pass) + USE_FEATURE_HTTPD_SETUID(, &s_ugid) + , &bind_addr_or_port + , &verbose + ); + if (opt & OPT_DECODE_URL) { + fputs(decodeString(url_for_decode, 1), stdout); + return 0; + } +#if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR + if (opt & OPT_ENCODE_URL) { + fputs(encodeString(url_for_encode), stdout); + return 0; + } +#endif +#if ENABLE_FEATURE_HTTPD_AUTH_MD5 + if (opt & OPT_MD5) { + puts(pw_encrypt(pass, "$1$", 1)); + return 0; + } +#endif +#if ENABLE_FEATURE_HTTPD_SETUID + if (opt & OPT_SETUID) { + xget_uidgid(&ugid, s_ugid); + } +#endif + +#if !BB_MMU + if (!(opt & OPT_FOREGROUND)) { + bb_daemonize_or_rexec(0, argv); /* don't change current directory */ + } +#endif + + xchdir(home_httpd); + if (!(opt & OPT_INETD)) { + signal(SIGCHLD, SIG_IGN); + server_socket = openServer(); +#if ENABLE_FEATURE_HTTPD_SETUID + /* drop privileges */ + if (opt & OPT_SETUID) { + if (ugid.gid != (gid_t)-1) { + if (setgroups(1, &ugid.gid) == -1) + bb_perror_msg_and_die("setgroups"); + xsetgid(ugid.gid); + } + xsetuid(ugid.uid); + } +#endif + } + +#if 0 /*was #if ENABLE_FEATURE_HTTPD_CGI*/ + /* User can do it himself: 'env - PATH="$PATH" httpd' + * We don't do it because we don't want to screw users + * which want to do + * 'env - VAR1=val1 VAR2=val2 httpd' + * and have VAR1 and VAR2 values visible in their CGIs. + * Besides, it is also smaller. */ + { + char *p = getenv("PATH"); + /* env strings themself are not freed, no need to xstrdup(p): */ + clearenv(); + if (p) + putenv(p - 5); +// if (!(opt & OPT_INETD)) +// setenv_long("SERVER_PORT", ???); + } +#endif + +#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP + if (!(opt & OPT_INETD)) { + /* runs parse_conf() inside */ + sighup_handler(0); + } else +#endif + { + parse_conf(default_path_httpd_conf, FIRST_PARSE); + } + + xfunc_error_retval = 0; + if (opt & OPT_INETD) + mini_httpd_inetd(); +#if BB_MMU + if (!(opt & OPT_FOREGROUND)) + bb_daemonize(0); /* don't change current directory */ + mini_httpd(server_socket); /* never returns */ +#else + mini_httpd_nommu(server_socket, argc, argv); /* never returns */ +#endif + /* return 0; */ +} |