/* ==================================================================== * Copyright (c) 1995 The Apache Group. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the Apache Group * for use in the Apache HTTP server project (http://www.apache.org/)." * * 4. The names "Apache Server" and "Apache Group" must not be used to * endorse or promote products derived from this software without * prior written permission. * * 5. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the Apache Group * for use in the Apache HTTP server project (http://www.apache.org/)." * * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE APACHE GROUP OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Group and was originally based * on public domain software written at the National Center for * Supercomputing Applications, University of Illinois, Urbana-Champaign. * For more information on the Apache Group and the Apache HTTP server * project, please see . * */ /* * http_config.c: once was auxillary functions for reading httpd's config * file and converting filenames into a namespace * * Rob McCool * * Wall-to-wall rewrite for Shambhala... commands which are part of the * server core can now be found next door in "http_core.c". Now contains * general command loop, and functions which do bookkeeping for the new * Shambhala config stuff (modules and configuration vectors). * * rst * */ #define CORE_PRIVATE #include "httpd.h" #include "http_config.h" #include "http_core.h" #include "http_log.h" /* for errors in parse_htaccess */ #include "http_request.h" /* for default_handler (see invoke_handler) */ #include "http_conf_globals.h" /* Sigh... */ /**************************************************************** * * We begin with the functions which deal with the linked list * of modules which control just about all of server operation in * Shambhala. */ static int num_modules = 0; module *top_module = NULL; typedef int (*handler)(request_rec *); typedef void *(*maker)(pool *); typedef void *(*dir_maker)(pool *, char *); typedef void *(*merger)(pool *, void *, void *); /* Dealing with config vectors. These are associated with per-directory, * per-server, and per-request configuration, and have a void* pointer for * each modules. The nature of the structure pointed to is private to the * module in question... the core doesn't (and can't) know. However, there * are defined interfaces which allow it to create instances of its private * per-directory and per-server structures, and to merge the per-directory * structures of a directory and its subdirectory (producing a new one in * which the defaults applying to the base directory have been properly * overridden). */ void * get_module_config (void *conf_vector, module *m) { void **confv = (void**)conf_vector; return confv[m->module_index]; } void set_module_config (void *conf_vector, module *m, void *val) { void **confv = (void**)conf_vector; confv[m->module_index] = val; } void * create_empty_config (pool *p) { void **conf_vector = (void **)pcalloc(p, sizeof(void*) * num_modules); return (void *)conf_vector; } void * create_default_per_dir_config (pool *p) { void **conf_vector = (void **)pcalloc(p, sizeof(void*) * (num_modules+DYNAMIC_MODULE_LIMIT)); module *modp; for (modp = top_module; modp; modp = modp->next) { dir_maker df = modp->create_dir_config; if (df) conf_vector[modp->module_index] = (*df)(p, NULL); } return (void*)conf_vector; } void * merge_per_dir_configs (pool *p, void *base, void *new) { void **conf_vector = (void **)pcalloc(p, sizeof(void*) * num_modules); void **base_vector = (void **) base; void **new_vector = (void **) new; module *modp; for (modp = top_module; modp; modp = modp->next) { merger df = modp->merge_dir_config; int i = modp->module_index; if (df && new_vector[i]) conf_vector[i] = (*df)(p, base_vector[i], new_vector[i]); else conf_vector[i] = new_vector[i]? new_vector[i] : base_vector[i]; } return (void*)conf_vector; } void * create_server_config (pool *p, server_rec *s) { void **conf_vector = (void **)pcalloc(p, sizeof(void*) * (num_modules+DYNAMIC_MODULE_LIMIT)); module *modp; for (modp = top_module; modp; modp = modp->next) { if (modp->create_server_config) conf_vector[modp->module_index]=(*modp->create_server_config)(p,s); } return (void*)conf_vector; } void merge_server_configs (pool *p, void *base, void *virt) { /* Can reuse the 'virt' vector for the spine of it, since we don't * have to deal with the moral equivalent of .htaccess files here... */ void **base_vector = (void **)base; void **virt_vector = (void **)virt; module *modp; for (modp = top_module; modp; modp = modp->next) { merger df = modp->merge_server_config; int i = modp->module_index; if (!virt_vector[i]) virt_vector[i] = base_vector[i]; else if (df) virt_vector[i] = (*df)(p, base_vector[i], virt_vector[i]); } } void *create_connection_config (pool *p) { return create_empty_config (p); } void *create_request_config (pool *p) { return create_empty_config (p); } void *create_per_dir_config (pool *p) { return create_empty_config (p); } /**************************************************************** * * Dispatch through the modules to find handlers for various phases * of request handling. These are invoked by http_request.c to actually * do the dirty work of slogging through the module structures. */ int run_method (request_rec *r, int offset, int run_all) { module *modp; for (modp = top_module; modp; modp = modp->next) { handler mod_handler = *(handler *)(offset + (char *)(modp)); if (mod_handler) { int result = (*mod_handler)(r); if (result != DECLINED && (!run_all || result != OK)) return result; } } return run_all ? OK : DECLINED; } int translate_name(request_rec *r) { return run_method (r, XtOffsetOf (module, translate_handler), 0); } int check_access(request_rec *r) { return run_method (r, XtOffsetOf (module, access_checker), 1); } int find_types (request_rec *r) { return run_method (r, XtOffsetOf (module, type_checker), 0); } int run_fixups (request_rec *r) { return run_method (r, XtOffsetOf (module, fixer_upper), 1); } int log_transaction (request_rec *r) { return run_method (r, XtOffsetOf (module, logger), 1); } /* Auth stuff --- anything that defines one of these will presumably * want to define something for the other. Note that check_auth is * separate from check_access to make catching some config errors easier. */ int check_user_id (request_rec *r) { return run_method (r, XtOffsetOf (module, check_user_id), 0); } int check_auth (request_rec *r) { return run_method (r, XtOffsetOf (module, auth_checker), 0); } /* * This should really do multiple passes, choosing wildcards last, * which would allow us to declare default_handler as a wildcard on * core_module. Close enough for now... */ int invoke_handler (request_rec *r) { module *modp; handler_rec *handp; char *content_type = r->content_type ? r->content_type : default_type (r); /* Pass one --- direct matches */ for (modp = top_module; modp; modp = modp->next) { if (!modp->handlers) continue; for (handp = modp->handlers; handp->content_type; ++handp) { if (!strcasecmp (content_type, handp->content_type)) { int result = (*handp->handler)(r); if (result != DECLINED) return result; } } } /* Pass two --- wildcard matches */ for (modp = top_module; modp; modp = modp->next) { if (!modp->handlers) continue; for (handp = modp->handlers; handp->content_type; ++handp) { char *starp = strchr (handp->content_type, '*'); int len; if (!starp) continue; len = starp - handp->content_type; if (!len || !strncasecmp (content_type, handp->content_type, len)) { int result = (*handp->handler)(r); if (result != DECLINED) return result; } } } return NOT_IMPLEMENTED; } /* One-time setup for precompiled modules --- NOT to be done on restart */ void add_module (module *m) { /* This could be called from an AddModule httpd.conf command, * after the file has been linked and the module structure within it * teased out... */ m->next = top_module; top_module = m; m->module_index = num_modules++; } void setup_prelinked_modules () { extern module *prelinked_modules[]; module **m = prelinked_modules; while (*m) { add_module (*m); ++m; } } /***************************************************************** * * Resource, access, and .htaccess config files now parsed by a common * command loop. * * Let's begin with the basics; parsing the line and * invoking the function... */ char *invoke_cmd(command_rec *cmd, cmd_parms *parms, void *mconfig, char *args) { char *w, *w2, *errmsg; if ((parms->override & cmd->req_override) == 0) return pstrcat (parms->pool, cmd->name, " not allowed here", NULL); parms->info = cmd->cmd_data; switch (cmd->args_how) { case RAW_ARGS: return (*cmd->func) (parms, mconfig, args); case NO_ARGS: if (*args != 0) return pstrcat (parms->pool, cmd->name, " takes no arguments", NULL); return (*cmd->func) (parms, mconfig); case TAKE1: w = getword_conf (parms->pool, &args); if (*w == '\0' || *args != 0) return pstrcat (parms->pool, cmd->name, " takes one argument", cmd->errmsg ? ", " : NULL, cmd->errmsg, NULL); return (*cmd->func) (parms, mconfig, w); case TAKE2: w = getword_conf (parms->pool, &args); w2 = getword_conf (parms->pool, &args); if (*w == '\0' || *w2 == '\0' || *args != 0) return pstrcat (parms->pool, cmd->name, " takes two arguments", cmd->errmsg ? ", " : NULL, cmd->errmsg, NULL); return (*cmd->func) (parms, mconfig, w, w2); case ITERATE: while (*(w = getword_conf (parms->pool, &args)) != '\0') if ((errmsg = (*cmd->func) (parms, mconfig, w))) return errmsg; return NULL; case ITERATE2: w = getword_conf (parms->pool, &args); if (*w == '\0' || *args == 0) return pstrcat(parms->pool, cmd->name, " requires at least two arguments", cmd->errmsg ? ", " : NULL, cmd->errmsg, NULL); while (*(w2 = getword_conf (parms->pool, &args)) != '\0') if ((errmsg = (*cmd->func) (parms, mconfig, w, w2))) return errmsg; return NULL; case FLAG: w = getword_conf (parms->pool, &args); if (*w == '\0' || ((!strcasecmp(w, "on")) && (!strcasecmp (w, "off")))) return pstrcat (parms->pool, cmd->name, " must be On or Off", NULL); return (*cmd->func) (parms, mconfig, strcasecmp (w, "off")); default: return pstrcat (parms->pool, cmd->name, " is improperly configured internally (server bug)", NULL); } } command_rec *find_command (char *name, command_rec *cmds) { while (cmds->name) if (!strcasecmp (name, cmds->name)) return cmds; else ++cmds; return NULL; } command_rec *find_command_in_modules (char *cmd_name, module **mod) { command_rec *cmdp; module *modp; for (modp = top_module; modp; modp = modp->next) if (modp->cmds && (cmdp = find_command (cmd_name, modp->cmds))) { *mod = modp; return cmdp; } return NULL; } char *handle_command (cmd_parms *parms, void *config, char *l) { char *args, *cmd_name; command_rec *cmd; module *mod; ++parms->config_line; if((l[0] == '#') || (!l[0])) return NULL; args = l; cmd_name = getword_conf (parms->temp_pool, &args); if (*cmd_name == '\0') return NULL; if (!(cmd = find_command_in_modules (cmd_name, &mod))) { return pstrcat (parms->pool, "Invalid command ", cmd_name, NULL); } else { void *mconfig = get_module_config (config, mod); void *sconfig = get_module_config (parms->server->module_config, mod); if (!mconfig && mod->create_dir_config) { mconfig = (*mod->create_dir_config) (parms->pool, parms->path); set_module_config (config, mod, mconfig); } if (!sconfig && mod->create_server_config) { sconfig = (*mod->create_server_config)(parms->pool, parms->server); set_module_config (parms->server->module_config, mod, sconfig); } return invoke_cmd (cmd, parms, mconfig, args); } } char *srm_command_loop (cmd_parms *parms, void *config) { char l[MAX_STRING_LEN]; while (!(cfg_getline (l, MAX_STRING_LEN, parms->infile))) { char *errmsg = handle_command (parms, config, l); if (errmsg) return errmsg; } return NULL; } /* * Generic command functions... */ char *set_string_slot (cmd_parms *cmd, char *struct_ptr, char *arg) { /* This one's pretty generic... */ int offset = (int)cmd->info; *(char **)(struct_ptr + offset) = pstrdup (cmd->pool, arg); return NULL; } /***************************************************************** * * Reading whole config files... */ cmd_parms default_parms = { NULL, 0, -1, NULL, 0, NULL, NULL, NULL, NULL }; char *server_root_relative (pool *p, char *file) { #ifdef __EMX__ /* Add support for OS/2 drive names */ if ((file[0] == '/') || (file[1] == ':')) return file; #else if (file[0] == '/') return file; #endif return make_full_path (p, server_root, file); } void process_resource_config(server_rec *s, char *fname, pool *p, pool *ptemp) { FILE *cfg; char *errmsg; cmd_parms parms; fname = server_root_relative (p, fname); /* GCC's initialization extensions are soooo nice here... */ parms = default_parms; parms.config_file = fname; parms.pool = p; parms.temp_pool = ptemp; parms.server = s; parms.override = (RSRC_CONF|OR_ALL)&~(OR_AUTHCFG|OR_LIMIT); if(!(cfg = fopen(fname, "r"))) { fprintf(stderr,"httpd: could not open document config file %s\n", fname); perror("fopen"); exit(1); } parms.infile = cfg; errmsg = srm_command_loop (&parms, s->lookup_defaults); if (errmsg) { fprintf (stderr, "Syntax error on line %d of %s:\n", parms.config_line, fname); fprintf (stderr, "%s\n", errmsg); exit(1); } fclose(cfg); } int parse_htaccess(void **result, request_rec *r, int override, char *d, char *filename) { FILE *f; cmd_parms parms; char *errmsg; const struct htaccess_result *cache; struct htaccess_result *new; void *dc; /* firstly, search cache */ for (cache=r->htaccess; cache != NULL; cache=cache->next) if (cache->override == override && strcmp(cache->dir, d) == 0) { if (cache->htaccess != NULL) *result = cache->htaccess; return OK; } parms = default_parms; parms.override = override; parms.pool = r->pool; parms.temp_pool = r->pool; parms.server = r->server; parms.path = d; if((f=pfopen(r->pool, filename, "r"))) { dc = create_per_dir_config (r->pool); parms.infile = f; parms.config_file = filename; errmsg = srm_command_loop (&parms, dc); pfclose(r->pool, f); if (errmsg) { log_reason (errmsg, filename, r); return SERVER_ERROR; } *result = dc; } else dc = NULL; /* cache it */ new = palloc(r->pool, sizeof(struct htaccess_result)); new->dir = pstrdup(r->pool, d); new->override = override; new->htaccess = dc; /* add to head of list */ new->next = r->htaccess; r->htaccess = new; return OK; } /***************************************************************** * * Virtual host stuff; note that the commands that invoke this stuff * are with the command table in http_core.c. */ server_rec *init_virtual_host (pool *p, char *hostname) { server_rec *s = (server_rec *)pcalloc (p, sizeof (server_rec)); #ifdef RLIMIT_NOFILE struct rlimit limits; getrlimit ( RLIMIT_NOFILE, &limits ); if ( limits.rlim_cur < limits.rlim_max ) { limits.rlim_cur += 2; if ( setrlimit ( RLIMIT_NOFILE, &limits ) < 0 ) fprintf (stderr, "Cannot exceed hard limit for open files"); } #endif s->hostname_lookups = 2; /* binary, but will use 2 as an "unset = on" */ s->server_admin = NULL; s->server_hostname = NULL; s->error_fname = NULL; s->srm_confname = NULL; s->access_confname = NULL; s->timeout = 0; s->do_rfc931 = 0; s->host_addr.s_addr = get_virthost_addr (hostname, &s->host_port); s->port = s->host_port; /* set them the same, by default */ s->next = NULL; s->module_config = create_empty_config (p); s->lookup_defaults = create_per_dir_config (p); return s; } int is_virtual_server (server_rec *s) { return s->is_virtual; } void fixup_virtual_hosts (pool *p, server_rec *main_server) { server_rec *virt; for (virt = main_server->next; virt; virt = virt->next) { merge_server_configs (p, main_server->module_config, virt->module_config); virt->lookup_defaults = merge_per_dir_configs (p, main_server->lookup_defaults, virt->lookup_defaults); if (virt->port == 0) virt->port = main_server->port; if (virt->hostname_lookups == 2) virt->hostname_lookups = main_server->hostname_lookups; if (virt->server_admin == NULL) virt->server_admin = main_server->server_admin; if (virt->srm_confname == NULL) virt->srm_confname = main_server->srm_confname; if (virt->access_confname == NULL) virt->access_confname = main_server->access_confname; if (virt->timeout == 0) virt->timeout = main_server->timeout; if (virt->do_rfc931 == 0) virt->do_rfc931 = main_server->do_rfc931; } } /***************************************************************** * * Getting *everything* configured... */ void init_config_globals (pool *p) { /* ServerRoot, server_confname set in httpd.c */ standalone = 1; user_name = DEFAULT_USER; user_id = uname2id(DEFAULT_USER); group_id = gname2id(DEFAULT_GROUP); daemons_to_start = DEFAULT_START_DAEMON; daemons_min_free = DEFAULT_MIN_FREE_DAEMON; daemons_max_free = DEFAULT_MAX_FREE_DAEMON; daemons_limit = DEFAULT_SERVER_LIMIT; pid_fname = DEFAULT_PIDLOG; scoreboard_fname = DEFAULT_SCOREBOARD; max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD; bind_address.s_addr = htonl(INADDR_ANY); listeners = NULL; } server_rec *init_server_config(pool *p) { server_rec *s = (server_rec *)pcalloc (p, sizeof (server_rec)); s->port = DEFAULT_PORT; s->hostname_lookups = 1; s->server_admin = DEFAULT_ADMIN; s->server_hostname = NULL; s->error_fname = DEFAULT_ERRORLOG; s->srm_confname = RESOURCE_CONFIG_FILE; s->access_confname = ACCESS_CONFIG_FILE; s->timeout = DEFAULT_TIMEOUT; s->keep_alive_timeout = DEFAULT_KEEPALIVE_TIMEOUT; s->keep_alive = DEFAULT_KEEPALIVE; s->do_rfc931 = DEFAULT_RFC931; s->next = NULL; s->host_addr.s_addr = htonl (INADDR_ANY); /* NOT virtual host; * don't match any real network * interface. */ s->host_port = 0; /* matches any port */ s->module_config = create_server_config (p, s); s->lookup_defaults = create_default_per_dir_config (p); return s; } server_rec *read_config(pool *p, pool *ptemp, char *confname) { server_rec *s = init_server_config(p); module *m; init_config_globals(p); /* All server-wide config files now have the SAME syntax... */ process_resource_config (s, confname, p, ptemp); process_resource_config (s, s->srm_confname, p, ptemp); process_resource_config (s, s->access_confname, p, ptemp); fixup_virtual_hosts (p, s); for (m = top_module; m; m = m->next) if (m->init) (*m->init) (s, p); return s; }