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http_config.c
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/* ====================================================================
* 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
* IT'S 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://www.apache.org/>.
*
*/
/*
* 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)
{
if (file[0] == '/') return file;
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;
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"))) {
void *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;
return OK;
}
else
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->port = 0;
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, 0);
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->host_addr.s_addr != htonl (INADDR_ANY);
}
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->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;
max_requests_per_child = DEFAULT_MAX_REQUESTS_PER_CHILD;
bind_address.s_addr = htonl(INADDR_ANY);
}
server_rec *init_server_config(pool *p)
{
server_rec *s = (server_rec *)pcalloc (p, sizeof (server_rec));
s->port = DEFAULT_PORT;
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->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->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;
}