| /* Copyright 1999-2004 The Apache Software Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* |
| * http_script: keeps all script-related ramblings together. |
| * |
| * Compliant to cgi/1.1 spec |
| * |
| * Adapted by rst from original NCSA code by Rob McCool |
| * |
| * Apache adds some new env vars; REDIRECT_URL and REDIRECT_QUERY_STRING for |
| * custom error responses, and DOCUMENT_ROOT because we found it useful. |
| * It also adds SERVER_ADMIN - useful for scripts to know who to mail when |
| * they fail. |
| */ |
| |
| #include "apr_lib.h" |
| #include "apr_strings.h" |
| #include "apr_general.h" |
| #include "apr_file_io.h" |
| #include "apr_portable.h" |
| #include "apr_buckets.h" |
| #include "apr_optional.h" |
| #include "apr_signal.h" |
| |
| #define APR_WANT_STRFUNC |
| #include "apr_want.h" |
| |
| #if APR_HAVE_SYS_SOCKET_H |
| #include <sys/socket.h> |
| #endif |
| #if APR_HAVE_UNISTD_H |
| #include <unistd.h> |
| #endif |
| #if APR_HAVE_SYS_TYPES_H |
| #include <sys/types.h> |
| #endif |
| |
| #define CORE_PRIVATE |
| |
| #include "util_filter.h" |
| #include "httpd.h" |
| #include "http_config.h" |
| #include "http_request.h" |
| #include "http_core.h" |
| #include "http_protocol.h" |
| #include "http_main.h" |
| #include "http_log.h" |
| #include "util_script.h" |
| #include "ap_mpm.h" |
| #include "unixd.h" |
| #include "mod_suexec.h" |
| #include "../filters/mod_include.h" |
| |
| #include "mod_core.h" |
| |
| |
| /* ### should be tossed in favor of APR */ |
| #include <sys/stat.h> |
| #include <sys/un.h> /* for sockaddr_un */ |
| |
| |
| module AP_MODULE_DECLARE_DATA cgid_module; |
| |
| static int cgid_start(apr_pool_t *p, server_rec *main_server, apr_proc_t *procnew); |
| static int cgid_init(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *main_server); |
| static int handle_exec(include_ctx_t *ctx, ap_filter_t *f, apr_bucket_brigade *bb); |
| |
| static APR_OPTIONAL_FN_TYPE(ap_register_include_handler) *cgid_pfn_reg_with_ssi; |
| static APR_OPTIONAL_FN_TYPE(ap_ssi_get_tag_and_value) *cgid_pfn_gtv; |
| static APR_OPTIONAL_FN_TYPE(ap_ssi_parse_string) *cgid_pfn_ps; |
| |
| static apr_pool_t *pcgi = NULL; |
| static int total_modules = 0; |
| static pid_t daemon_pid; |
| static int daemon_should_exit = 0; |
| static server_rec *root_server = NULL; |
| static apr_pool_t *root_pool = NULL; |
| static const char *sockname; |
| |
| /* Read and discard the data in the brigade produced by a CGI script */ |
| static void discard_script_output(apr_bucket_brigade *bb); |
| |
| /* KLUDGE --- for back-combatibility, we don't have to check ExecCGI |
| * in ScriptAliased directories, which means we need to know if this |
| * request came through ScriptAlias or not... so the Alias module |
| * leaves a note for us. |
| */ |
| |
| static int is_scriptaliased(request_rec *r) |
| { |
| const char *t = apr_table_get(r->notes, "alias-forced-type"); |
| return t && (!strcasecmp(t, "cgi-script")); |
| } |
| |
| /* Configuration stuff */ |
| |
| #define DEFAULT_LOGBYTES 10385760 |
| #define DEFAULT_BUFBYTES 1024 |
| #define DEFAULT_SOCKET DEFAULT_REL_RUNTIMEDIR "/cgisock" |
| |
| #define CGI_REQ 1 |
| #define SSI_REQ 2 |
| #define GETPID_REQ 3 /* get the pid of script created for prior request */ |
| |
| #define ERRFN_USERDATA_KEY "CGIDCHILDERRFN" |
| |
| /* DEFAULT_CGID_LISTENBACKLOG controls the max depth on the unix socket's |
| * pending connection queue. If a bunch of cgi requests arrive at about |
| * the same time, connections from httpd threads/processes will back up |
| * in the queue while the cgid process slowly forks off a child to process |
| * each connection on the unix socket. If the queue is too short, the |
| * httpd process will get ECONNREFUSED when trying to connect. |
| */ |
| #ifndef DEFAULT_CGID_LISTENBACKLOG |
| #define DEFAULT_CGID_LISTENBACKLOG 100 |
| #endif |
| |
| /* DEFAULT_CONNECT_ATTEMPTS controls how many times we'll try to connect |
| * to the cgi daemon from the thread/process handling the cgi request. |
| * Generally we want to retry when we get ECONNREFUSED since it is |
| * probably because the listen queue is full. We need to try harder so |
| * the client doesn't see it as a 503 error. |
| * |
| * Set this to 0 to continually retry until the connect works or Apache |
| * terminates. |
| */ |
| #ifndef DEFAULT_CONNECT_ATTEMPTS |
| #define DEFAULT_CONNECT_ATTEMPTS 15 |
| #endif |
| |
| typedef struct { |
| const char *logname; |
| long logbytes; |
| int bufbytes; |
| } cgid_server_conf; |
| |
| typedef struct { |
| int req_type; /* request type (CGI_REQ, SSI_REQ, etc.) */ |
| unsigned long conn_id; /* connection id; daemon uses this as a hash value |
| * to find the script pid when it is time for that |
| * process to be cleaned up |
| */ |
| int core_module_index; |
| int have_suexec; |
| int suexec_module_index; |
| suexec_config_t suexec_cfg; |
| int env_count; |
| apr_size_t filename_len; |
| apr_size_t argv0_len; |
| apr_size_t uri_len; |
| apr_size_t args_len; |
| apr_size_t mod_userdir_user_len; |
| int loglevel; /* to stuff in server_rec */ |
| } cgid_req_t; |
| |
| /* This routine is called to create the argument list to be passed |
| * to the CGI script. When suexec is enabled, the suexec path, user, and |
| * group are the first three arguments to be passed; if not, all three |
| * must be NULL. The query info is split into separate arguments, where |
| * "+" is the separator between keyword arguments. |
| * |
| * Do not process the args if they containing an '=' assignment. |
| */ |
| static char **create_argv(apr_pool_t *p, char *path, char *user, char *group, |
| char *av0, const char *args) |
| { |
| int x, numwords; |
| char **av; |
| char *w; |
| int idx = 0; |
| |
| if (ap_strchr_c(args, '=')) { |
| numwords = 0; |
| } |
| else { |
| /* count the number of keywords */ |
| |
| for (x = 0, numwords = 1; args[x]; x++) { |
| if (args[x] == '+') { |
| ++numwords; |
| } |
| } |
| } |
| |
| if (numwords > APACHE_ARG_MAX - 5) { |
| numwords = APACHE_ARG_MAX - 5; /* Truncate args to prevent overrun */ |
| } |
| av = (char **) apr_pcalloc(p, (numwords + 5) * sizeof(char *)); |
| |
| if (path) { |
| av[idx++] = path; |
| } |
| if (user) { |
| av[idx++] = user; |
| } |
| if (group) { |
| av[idx++] = group; |
| } |
| |
| av[idx++] = apr_pstrdup(p, av0); |
| |
| for (x = 1; x <= numwords; x++) { |
| w = ap_getword_nulls(p, &args, '+'); |
| if (strcmp(w, "")) { |
| ap_unescape_url(w); |
| av[idx++] = ap_escape_shell_cmd(p, w); |
| } |
| } |
| av[idx] = NULL; |
| return av; |
| } |
| |
| #if APR_HAS_OTHER_CHILD |
| static void cgid_maint(int reason, void *data, apr_wait_t status) |
| { |
| apr_proc_t *proc = data; |
| int mpm_state; |
| int stopping; |
| |
| switch (reason) { |
| case APR_OC_REASON_DEATH: |
| apr_proc_other_child_unregister(data); |
| /* If apache is not terminating or restarting, |
| * restart the cgid daemon |
| */ |
| stopping = 1; /* if MPM doesn't support query, |
| * assume we shouldn't restart daemon |
| */ |
| if (ap_mpm_query(AP_MPMQ_MPM_STATE, &mpm_state) == APR_SUCCESS && |
| mpm_state != AP_MPMQ_STOPPING) { |
| stopping = 0; |
| } |
| if (!stopping) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, |
| "cgid daemon process died, restarting"); |
| cgid_start(root_pool, root_server, proc); |
| } |
| break; |
| case APR_OC_REASON_RESTART: |
| /* don't do anything; server is stopping or restarting */ |
| apr_proc_other_child_unregister(data); |
| break; |
| case APR_OC_REASON_LOST: |
| /* Restart the child cgid daemon process */ |
| apr_proc_other_child_unregister(data); |
| cgid_start(root_pool, root_server, proc); |
| break; |
| case APR_OC_REASON_UNREGISTER: |
| /* we get here when pcgi is cleaned up; pcgi gets cleaned |
| * up when pconf gets cleaned up |
| */ |
| kill(proc->pid, SIGHUP); /* send signal to daemon telling it to die */ |
| break; |
| } |
| } |
| #endif |
| |
| /* deal with incomplete reads and signals |
| * assume you really have to read buf_size bytes |
| */ |
| static apr_status_t sock_read(int fd, void *vbuf, size_t buf_size) |
| { |
| char *buf = vbuf; |
| int rc; |
| size_t bytes_read = 0; |
| |
| do { |
| do { |
| rc = read(fd, buf + bytes_read, buf_size - bytes_read); |
| } while (rc < 0 && errno == EINTR); |
| switch(rc) { |
| case -1: |
| return errno; |
| case 0: /* unexpected */ |
| return ECONNRESET; |
| default: |
| bytes_read += rc; |
| } |
| } while (bytes_read < buf_size); |
| |
| return APR_SUCCESS; |
| } |
| |
| /* deal with signals |
| */ |
| static apr_status_t sock_write(int fd, const void *buf, size_t buf_size) |
| { |
| int rc; |
| |
| do { |
| rc = write(fd, buf, buf_size); |
| } while (rc < 0 && errno == EINTR); |
| if (rc < 0) { |
| return errno; |
| } |
| |
| return APR_SUCCESS; |
| } |
| |
| static apr_status_t get_req(int fd, request_rec *r, char **argv0, char ***env, |
| cgid_req_t *req) |
| { |
| int i; |
| char *user; |
| char **environ; |
| core_dir_config *temp_core; |
| void **dconf; |
| apr_status_t stat; |
| |
| r->server = apr_pcalloc(r->pool, sizeof(server_rec)); |
| |
| /* read the request header */ |
| stat = sock_read(fd, req, sizeof(*req)); |
| if (stat != APR_SUCCESS) { |
| return stat; |
| } |
| r->server->loglevel = req->loglevel; |
| if (req->req_type == GETPID_REQ) { |
| /* no more data sent for this request */ |
| return APR_SUCCESS; |
| } |
| |
| /* handle module indexes and such */ |
| dconf = (void **) apr_pcalloc(r->pool, sizeof(void *) * (total_modules + DYNAMIC_MODULE_LIMIT)); |
| |
| temp_core = (core_dir_config *)apr_palloc(r->pool, sizeof(core_module)); |
| dconf[req->core_module_index] = (void *)temp_core; |
| |
| if (req->have_suexec) { |
| dconf[req->suexec_module_index] = &req->suexec_cfg; |
| } |
| |
| r->per_dir_config = (ap_conf_vector_t *)dconf; |
| |
| /* Read the filename, argv0, uri, and args */ |
| r->filename = apr_pcalloc(r->pool, req->filename_len + 1); |
| *argv0 = apr_pcalloc(r->pool, req->argv0_len + 1); |
| r->uri = apr_pcalloc(r->pool, req->uri_len + 1); |
| if ((stat = sock_read(fd, r->filename, req->filename_len)) != APR_SUCCESS || |
| (stat = sock_read(fd, *argv0, req->argv0_len)) != APR_SUCCESS || |
| (stat = sock_read(fd, r->uri, req->uri_len)) != APR_SUCCESS) { |
| return stat; |
| } |
| |
| r->args = apr_pcalloc(r->pool, req->args_len + 1); /* empty string if no args */ |
| if (req->args_len) { |
| if ((stat = sock_read(fd, r->args, req->args_len)) != APR_SUCCESS) { |
| return stat; |
| } |
| } |
| |
| /* read the environment variables */ |
| environ = apr_pcalloc(r->pool, (req->env_count + 2) *sizeof(char *)); |
| for (i = 0; i < req->env_count; i++) { |
| apr_size_t curlen; |
| |
| if ((stat = sock_read(fd, &curlen, sizeof(curlen))) != APR_SUCCESS) { |
| return stat; |
| } |
| environ[i] = apr_pcalloc(r->pool, curlen + 1); |
| if ((stat = sock_read(fd, environ[i], curlen)) != APR_SUCCESS) { |
| return stat; |
| } |
| } |
| *env = environ; |
| |
| /* basic notes table to avoid segfaults */ |
| r->notes = apr_table_make(r->pool, 1); |
| |
| /* mod_userdir requires the mod_userdir_user note */ |
| if (req->mod_userdir_user_len) { |
| user = apr_pcalloc(r->pool, req->mod_userdir_user_len + 1); /* last byte is '\0' */ |
| stat = sock_read(fd, user, req->mod_userdir_user_len); |
| if (stat != APR_SUCCESS) { |
| return stat; |
| } |
| apr_table_set(r->notes, "mod_userdir_user", (const char *)user); |
| } |
| |
| #if 0 |
| #ifdef RLIMIT_CPU |
| sock_read(fd, &j, sizeof(int)); |
| if (j) { |
| temp_core->limit_cpu = (struct rlimit *)apr_palloc (sizeof(struct rlimit)); |
| sock_read(fd, temp_core->limit_cpu, sizeof(struct rlimit)); |
| } |
| else { |
| temp_core->limit_cpu = NULL; |
| } |
| #endif |
| |
| #if defined (RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS) |
| sock_read(fd, &j, sizeof(int)); |
| if (j) { |
| temp_core->limit_mem = (struct rlimit *)apr_palloc(r->pool, sizeof(struct rlimit)); |
| sock_read(fd, temp_core->limit_mem, sizeof(struct rlimit)); |
| } |
| else { |
| temp_core->limit_mem = NULL; |
| } |
| #endif |
| |
| #ifdef RLIMIT_NPROC |
| sock_read(fd, &j, sizeof(int)); |
| if (j) { |
| temp_core->limit_nproc = (struct rlimit *)apr_palloc(r->pool, sizeof(struct rlimit)); |
| sock_read(fd, temp_core->limit_nproc, sizeof(struct rlimit)); |
| } |
| else { |
| temp_core->limit_nproc = NULL; |
| } |
| #endif |
| #endif |
| |
| return APR_SUCCESS; |
| } |
| |
| static apr_status_t send_req(int fd, request_rec *r, char *argv0, char **env, |
| int req_type) |
| { |
| int i; |
| const char *user; |
| module *suexec_mod = ap_find_linked_module("mod_suexec.c"); |
| cgid_req_t req = {0}; |
| suexec_config_t *suexec_cfg; |
| apr_status_t stat; |
| |
| req.req_type = req_type; |
| req.conn_id = r->connection->id; |
| req.core_module_index = core_module.module_index; |
| if (suexec_mod) { |
| req.have_suexec = 1; |
| req.suexec_module_index = suexec_mod->module_index; |
| suexec_cfg = ap_get_module_config(r->per_dir_config, |
| suexec_mod); |
| req.suexec_cfg = *suexec_cfg; |
| } |
| for (req.env_count = 0; env[req.env_count]; req.env_count++) { |
| continue; |
| } |
| req.filename_len = strlen(r->filename); |
| req.argv0_len = strlen(argv0); |
| req.uri_len = strlen(r->uri); |
| req.args_len = r->args ? strlen(r->args) : 0; |
| user = (const char *)apr_table_get(r->notes, "mod_userdir_user"); |
| if (user != NULL) { |
| req.mod_userdir_user_len = strlen(user); |
| } |
| req.loglevel = r->server->loglevel; |
| |
| /* Write the request header */ |
| if ((stat = sock_write(fd, &req, sizeof(req))) != APR_SUCCESS) { |
| return stat; |
| } |
| |
| /* Write filename, argv0, uri, and args */ |
| if ((stat = sock_write(fd, r->filename, req.filename_len)) != APR_SUCCESS || |
| (stat = sock_write(fd, argv0, req.argv0_len)) != APR_SUCCESS || |
| (stat = sock_write(fd, r->uri, req.uri_len)) != APR_SUCCESS) { |
| return stat; |
| } |
| if (req.args_len) { |
| if ((stat = sock_write(fd, r->args, req.args_len)) != APR_SUCCESS) { |
| return stat; |
| } |
| } |
| |
| /* write the environment variables */ |
| for (i = 0; i < req.env_count; i++) { |
| apr_size_t curlen = strlen(env[i]); |
| |
| if ((stat = sock_write(fd, &curlen, sizeof(curlen))) != APR_SUCCESS) { |
| return stat; |
| } |
| |
| if ((stat = sock_write(fd, env[i], curlen)) != APR_SUCCESS) { |
| return stat; |
| } |
| } |
| |
| /* send a minimal notes table */ |
| if (user) { |
| if ((stat = sock_write(fd, user, req.mod_userdir_user_len)) != APR_SUCCESS) { |
| return stat; |
| } |
| } |
| |
| #if 0 |
| #ifdef RLIMIT_CPU |
| if (conf->limit_cpu) { |
| len = 1; |
| stat = sock_write(fd, &len, sizeof(int)); |
| stat = sock_write(fd, conf->limit_cpu, sizeof(struct rlimit)); |
| } |
| else { |
| len = 0; |
| stat = sock_write(fd, &len, sizeof(int)); |
| } |
| #endif |
| |
| #if defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS) |
| if (conf->limit_mem) { |
| len = 1; |
| stat = sock_write(fd, &len, sizeof(int)); |
| stat = sock_write(fd, conf->limit_mem, sizeof(struct rlimit)); |
| } |
| else { |
| len = 0; |
| stat = sock_write(fd, &len, sizeof(int)); |
| } |
| #endif |
| |
| #ifdef RLIMIT_NPROC |
| if (conf->limit_nproc) { |
| len = 1; |
| stat = sock_write(fd, &len, sizeof(int)); |
| stat = sock_write(fd, conf->limit_nproc, sizeof(struct rlimit)); |
| } |
| else { |
| len = 0; |
| stat = sock_write(fd, &len, sizeof(int)); |
| } |
| #endif |
| #endif |
| return APR_SUCCESS; |
| } |
| |
| static void daemon_signal_handler(int sig) |
| { |
| if (sig == SIGHUP) { |
| ++daemon_should_exit; |
| } |
| } |
| |
| static void cgid_child_errfn(apr_pool_t *pool, apr_status_t err, |
| const char *description) |
| { |
| request_rec *r; |
| void *vr; |
| |
| apr_pool_userdata_get(&vr, ERRFN_USERDATA_KEY, pool); |
| r = vr; |
| |
| /* sure we got r, but don't call ap_log_rerror() because we don't |
| * have r->headers_in and possibly other storage referenced by |
| * ap_log_rerror() |
| */ |
| ap_log_error(APLOG_MARK, APLOG_ERR, err, r->server, "%s", description); |
| } |
| |
| static int cgid_server(void *data) |
| { |
| struct sockaddr_un unix_addr; |
| int sd, sd2, rc; |
| mode_t omask; |
| apr_socklen_t len; |
| apr_pool_t *ptrans; |
| server_rec *main_server = data; |
| apr_hash_t *script_hash = apr_hash_make(pcgi); |
| |
| apr_pool_create(&ptrans, pcgi); |
| |
| apr_signal(SIGCHLD, SIG_IGN); |
| apr_signal(SIGHUP, daemon_signal_handler); |
| |
| if (unlink(sockname) < 0 && errno != ENOENT) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server, |
| "Couldn't unlink unix domain socket %s", |
| sockname); |
| /* just a warning; don't bail out */ |
| } |
| |
| if ((sd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server, |
| "Couldn't create unix domain socket"); |
| return errno; |
| } |
| |
| memset(&unix_addr, 0, sizeof(unix_addr)); |
| unix_addr.sun_family = AF_UNIX; |
| strcpy(unix_addr.sun_path, sockname); |
| |
| omask = umask(0077); /* so that only Apache can use socket */ |
| rc = bind(sd, (struct sockaddr *)&unix_addr, sizeof(unix_addr)); |
| umask(omask); /* can't fail, so can't clobber errno */ |
| if (rc < 0) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server, |
| "Couldn't bind unix domain socket %s", |
| sockname); |
| return errno; |
| } |
| |
| if (listen(sd, DEFAULT_CGID_LISTENBACKLOG) < 0) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server, |
| "Couldn't listen on unix domain socket"); |
| return errno; |
| } |
| |
| if (!geteuid()) { |
| if (chown(sockname, unixd_config.user_id, -1) < 0) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server, |
| "Couldn't change owner of unix domain socket %s", |
| sockname); |
| return errno; |
| } |
| } |
| |
| unixd_setup_child(); /* if running as root, switch to configured user/group */ |
| |
| while (!daemon_should_exit) { |
| int errfileno = STDERR_FILENO; |
| char *argv0; |
| char **env; |
| const char * const *argv; |
| apr_int32_t in_pipe; |
| apr_int32_t out_pipe; |
| apr_int32_t err_pipe; |
| apr_cmdtype_e cmd_type; |
| request_rec *r; |
| apr_procattr_t *procattr = NULL; |
| apr_proc_t *procnew = NULL; |
| apr_file_t *inout; |
| cgid_req_t cgid_req; |
| apr_status_t stat; |
| |
| apr_pool_clear(ptrans); |
| |
| len = sizeof(unix_addr); |
| sd2 = accept(sd, (struct sockaddr *)&unix_addr, &len); |
| if (sd2 < 0) { |
| #if defined(ENETDOWN) |
| if (errno == ENETDOWN) { |
| /* The network has been shut down, no need to continue. Die gracefully */ |
| ++daemon_should_exit; |
| } |
| #endif |
| if (errno != EINTR) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, errno, |
| (server_rec *)data, |
| "Error accepting on cgid socket"); |
| } |
| continue; |
| } |
| |
| r = apr_pcalloc(ptrans, sizeof(request_rec)); |
| procnew = apr_pcalloc(ptrans, sizeof(*procnew)); |
| r->pool = ptrans; |
| stat = get_req(sd2, r, &argv0, &env, &cgid_req); |
| if (stat != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, stat, |
| main_server, |
| "Error reading request on cgid socket"); |
| close(sd2); |
| continue; |
| } |
| |
| if (cgid_req.req_type == GETPID_REQ) { |
| pid_t pid; |
| |
| pid = (pid_t)apr_hash_get(script_hash, &cgid_req.conn_id, sizeof(cgid_req.conn_id)); |
| if (write(sd2, &pid, sizeof(pid)) != sizeof(pid)) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, 0, |
| main_server, |
| "Error writing pid %" APR_PID_T_FMT " to handler", pid); |
| } |
| close(sd2); |
| continue; |
| } |
| |
| apr_os_file_put(&r->server->error_log, &errfileno, 0, r->pool); |
| apr_os_file_put(&inout, &sd2, 0, r->pool); |
| |
| if (cgid_req.req_type == SSI_REQ) { |
| in_pipe = APR_NO_PIPE; |
| out_pipe = APR_FULL_BLOCK; |
| err_pipe = APR_NO_PIPE; |
| cmd_type = APR_SHELLCMD; |
| } |
| else { |
| in_pipe = APR_CHILD_BLOCK; |
| out_pipe = APR_CHILD_BLOCK; |
| err_pipe = APR_CHILD_BLOCK; |
| cmd_type = APR_PROGRAM; |
| } |
| |
| if (((rc = apr_procattr_create(&procattr, ptrans)) != APR_SUCCESS) || |
| ((cgid_req.req_type == CGI_REQ) && |
| (((rc = apr_procattr_io_set(procattr, |
| in_pipe, |
| out_pipe, |
| err_pipe)) != APR_SUCCESS) || |
| /* XXX apr_procattr_child_*_set() is creating an unnecessary |
| * pipe between this process and the child being created... |
| * It is cleaned up with the temporary pool for this request. |
| */ |
| ((rc = apr_procattr_child_err_set(procattr, r->server->error_log, NULL)) != APR_SUCCESS) || |
| ((rc = apr_procattr_child_in_set(procattr, inout, NULL)) != APR_SUCCESS))) || |
| ((rc = apr_procattr_child_out_set(procattr, inout, NULL)) != APR_SUCCESS) || |
| ((rc = apr_procattr_dir_set(procattr, |
| ap_make_dirstr_parent(r->pool, r->filename))) != APR_SUCCESS) || |
| ((rc = apr_procattr_cmdtype_set(procattr, cmd_type)) != APR_SUCCESS) || |
| ((rc = apr_procattr_child_errfn_set(procattr, cgid_child_errfn)) != APR_SUCCESS)) { |
| /* Something bad happened, tell the world. |
| * ap_log_rerror() won't work because the header table used by |
| * ap_log_rerror() hasn't been replicated in the phony r |
| */ |
| ap_log_error(APLOG_MARK, APLOG_ERR, rc, r->server, |
| "couldn't set child process attributes: %s", r->filename); |
| } |
| else { |
| apr_pool_userdata_set(r, ERRFN_USERDATA_KEY, apr_pool_cleanup_null, ptrans); |
| |
| argv = (const char * const *)create_argv(r->pool, NULL, NULL, NULL, argv0, r->args); |
| |
| /* We want to close sd2 for the new CGI process too. |
| * If it is left open it'll make ap_pass_brigade() block |
| * waiting for EOF if CGI forked something running long. |
| * close(sd2) here should be okay, as CGI channel |
| * is already dup()ed by apr_procattr_child_{in,out}_set() |
| * above. |
| */ |
| close(sd2); |
| |
| rc = ap_os_create_privileged_process(r, procnew, argv0, argv, |
| (const char * const *)env, |
| procattr, ptrans); |
| |
| if (rc != APR_SUCCESS) { |
| /* Bad things happened. Everyone should have cleaned up. |
| * ap_log_rerror() won't work because the header table used by |
| * ap_log_rerror() hasn't been replicated in the phony r |
| */ |
| ap_log_error(APLOG_MARK, APLOG_ERR, rc, r->server, |
| "couldn't create child process: %d: %s", rc, |
| apr_filepath_name_get(r->filename)); |
| } |
| else { |
| /* We don't want to leak storage for the key, so only allocate |
| * a key if the key doesn't exist yet in the hash; there are |
| * only a limited number of possible keys (one for each |
| * possible thread in the server), so we can allocate a copy |
| * of the key the first time a thread has a cgid request. |
| * Note that apr_hash_set() only uses the storage passed in |
| * for the key if it is adding the key to the hash for the |
| * first time; new key storage isn't needed for replacing the |
| * existing value of a key. |
| */ |
| void *key; |
| |
| if (apr_hash_get(script_hash, &cgid_req.conn_id, sizeof(cgid_req.conn_id))) { |
| key = &cgid_req.conn_id; |
| } |
| else { |
| key = apr_pcalloc(pcgi, sizeof(cgid_req.conn_id)); |
| memcpy(key, &cgid_req.conn_id, sizeof(cgid_req.conn_id)); |
| } |
| apr_hash_set(script_hash, key, sizeof(cgid_req.conn_id), |
| (void *)procnew->pid); |
| } |
| } |
| } |
| return -1; |
| } |
| |
| static int cgid_start(apr_pool_t *p, server_rec *main_server, |
| apr_proc_t *procnew) |
| { |
| |
| daemon_should_exit = 0; /* clear setting from previous generation */ |
| if ((daemon_pid = fork()) < 0) { |
| ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server, |
| "mod_cgid: Couldn't spawn cgid daemon process"); |
| return DECLINED; |
| } |
| else if (daemon_pid == 0) { |
| if (pcgi == NULL) { |
| apr_pool_create(&pcgi, p); |
| } |
| cgid_server(main_server); |
| exit(-1); |
| } |
| procnew->pid = daemon_pid; |
| procnew->err = procnew->in = procnew->out = NULL; |
| apr_pool_note_subprocess(p, procnew, APR_KILL_AFTER_TIMEOUT); |
| #if APR_HAS_OTHER_CHILD |
| apr_proc_other_child_register(procnew, cgid_maint, procnew, NULL, p); |
| #endif |
| return OK; |
| } |
| |
| static int cgid_pre_config(apr_pool_t *pconf, apr_pool_t *plog, |
| apr_pool_t *ptemp) |
| { |
| sockname = DEFAULT_SOCKET; |
| return OK; |
| } |
| |
| static int cgid_init(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, |
| server_rec *main_server) |
| { |
| apr_proc_t *procnew = NULL; |
| int first_time = 0; |
| const char *userdata_key = "cgid_init"; |
| module **m; |
| int ret = OK; |
| |
| root_server = main_server; |
| root_pool = p; |
| |
| apr_pool_userdata_get((void **)&procnew, userdata_key, main_server->process->pool); |
| if (!procnew) { |
| first_time = 1; |
| procnew = apr_pcalloc(main_server->process->pool, sizeof(*procnew)); |
| procnew->pid = -1; |
| procnew->err = procnew->in = procnew->out = NULL; |
| apr_pool_userdata_set((const void *)procnew, userdata_key, |
| apr_pool_cleanup_null, main_server->process->pool); |
| } |
| |
| if (!first_time) { |
| total_modules = 0; |
| for (m = ap_preloaded_modules; *m != NULL; m++) |
| total_modules++; |
| |
| sockname = ap_server_root_relative(p, sockname); |
| ret = cgid_start(p, main_server, procnew); |
| if (ret != OK ) { |
| return ret; |
| } |
| cgid_pfn_reg_with_ssi = APR_RETRIEVE_OPTIONAL_FN(ap_register_include_handler); |
| cgid_pfn_gtv = APR_RETRIEVE_OPTIONAL_FN(ap_ssi_get_tag_and_value); |
| cgid_pfn_ps = APR_RETRIEVE_OPTIONAL_FN(ap_ssi_parse_string); |
| |
| if ((cgid_pfn_reg_with_ssi) && (cgid_pfn_gtv) && (cgid_pfn_ps)) { |
| /* Required by mod_include filter. This is how mod_cgid registers |
| * with mod_include to provide processing of the exec directive. |
| */ |
| cgid_pfn_reg_with_ssi("exec", handle_exec); |
| } |
| } |
| return ret; |
| } |
| |
| static void *create_cgid_config(apr_pool_t *p, server_rec *s) |
| { |
| cgid_server_conf *c = |
| (cgid_server_conf *) apr_pcalloc(p, sizeof(cgid_server_conf)); |
| |
| c->logname = NULL; |
| c->logbytes = DEFAULT_LOGBYTES; |
| c->bufbytes = DEFAULT_BUFBYTES; |
| return c; |
| } |
| |
| static void *merge_cgid_config(apr_pool_t *p, void *basev, void *overridesv) |
| { |
| cgid_server_conf *base = (cgid_server_conf *) basev, *overrides = (cgid_server_conf *) overridesv; |
| |
| return overrides->logname ? overrides : base; |
| } |
| |
| static const char *set_scriptlog(cmd_parms *cmd, void *dummy, const char *arg) |
| { |
| server_rec *s = cmd->server; |
| cgid_server_conf *conf = ap_get_module_config(s->module_config, |
| &cgid_module); |
| |
| conf->logname = ap_server_root_relative(cmd->pool, arg); |
| |
| if (!conf->logname) { |
| return apr_pstrcat(cmd->pool, "Invalid ScriptLog path ", |
| arg, NULL); |
| } |
| return NULL; |
| } |
| |
| static const char *set_scriptlog_length(cmd_parms *cmd, void *dummy, const char *arg) |
| { |
| server_rec *s = cmd->server; |
| cgid_server_conf *conf = ap_get_module_config(s->module_config, |
| &cgid_module); |
| |
| conf->logbytes = atol(arg); |
| return NULL; |
| } |
| |
| static const char *set_scriptlog_buffer(cmd_parms *cmd, void *dummy, const char *arg) |
| { |
| server_rec *s = cmd->server; |
| cgid_server_conf *conf = ap_get_module_config(s->module_config, |
| &cgid_module); |
| |
| conf->bufbytes = atoi(arg); |
| return NULL; |
| } |
| |
| static const char *set_script_socket(cmd_parms *cmd, void *dummy, const char *arg) |
| { |
| const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); |
| if (err != NULL) { |
| return err; |
| } |
| |
| sockname = ap_server_root_relative(cmd->pool, arg); |
| |
| if (!sockname) { |
| return apr_pstrcat(cmd->pool, "Invalid Scriptsock path", |
| arg, NULL); |
| } |
| |
| return NULL; |
| } |
| |
| static const command_rec cgid_cmds[] = |
| { |
| AP_INIT_TAKE1("ScriptLog", set_scriptlog, NULL, RSRC_CONF, |
| "the name of a log for script debugging info"), |
| AP_INIT_TAKE1("ScriptLogLength", set_scriptlog_length, NULL, RSRC_CONF, |
| "the maximum length (in bytes) of the script debug log"), |
| AP_INIT_TAKE1("ScriptLogBuffer", set_scriptlog_buffer, NULL, RSRC_CONF, |
| "the maximum size (in bytes) to record of a POST request"), |
| AP_INIT_TAKE1("Scriptsock", set_script_socket, NULL, RSRC_CONF, |
| "the name of the socket to use for communication with " |
| "the cgi daemon."), |
| {NULL} |
| }; |
| |
| static int log_scripterror(request_rec *r, cgid_server_conf * conf, int ret, |
| apr_status_t rv, char *error) |
| { |
| apr_file_t *f = NULL; |
| struct stat finfo; |
| char time_str[APR_CTIME_LEN]; |
| int log_flags = rv ? APLOG_ERR : APLOG_ERR; |
| |
| ap_log_rerror(APLOG_MARK, log_flags, rv, r, |
| "%s: %s", error, r->filename); |
| |
| /* XXX Very expensive mainline case! Open, then getfileinfo! */ |
| if (!conf->logname || |
| ((stat(conf->logname, &finfo) == 0) |
| && (finfo.st_size > conf->logbytes)) || |
| (apr_file_open(&f, conf->logname, |
| APR_APPEND|APR_WRITE|APR_CREATE, APR_OS_DEFAULT, r->pool) != APR_SUCCESS)) { |
| return ret; |
| } |
| |
| /* "%% [Wed Jun 19 10:53:21 1996] GET /cgid-bin/printenv HTTP/1.0" */ |
| apr_ctime(time_str, apr_time_now()); |
| apr_file_printf(f, "%%%% [%s] %s %s%s%s %s\n", time_str, r->method, r->uri, |
| r->args ? "?" : "", r->args ? r->args : "", r->protocol); |
| /* "%% 500 /usr/local/apache/cgid-bin */ |
| apr_file_printf(f, "%%%% %d %s\n", ret, r->filename); |
| |
| apr_file_printf(f, "%%error\n%s\n", error); |
| |
| apr_file_close(f); |
| return ret; |
| } |
| |
| static int log_script(request_rec *r, cgid_server_conf * conf, int ret, |
| char *dbuf, const char *sbuf, apr_bucket_brigade *bb, |
| apr_file_t *script_err) |
| { |
| const apr_array_header_t *hdrs_arr = apr_table_elts(r->headers_in); |
| const apr_table_entry_t *hdrs = (apr_table_entry_t *) hdrs_arr->elts; |
| char argsbuffer[HUGE_STRING_LEN]; |
| apr_file_t *f = NULL; |
| apr_bucket *e; |
| const char *buf; |
| apr_size_t len; |
| apr_status_t rv; |
| int first; |
| int i; |
| struct stat finfo; |
| char time_str[APR_CTIME_LEN]; |
| |
| /* XXX Very expensive mainline case! Open, then getfileinfo! */ |
| if (!conf->logname || |
| ((stat(conf->logname, &finfo) == 0) |
| && (finfo.st_size > conf->logbytes)) || |
| (apr_file_open(&f, conf->logname, |
| APR_APPEND|APR_WRITE|APR_CREATE, APR_OS_DEFAULT, r->pool) != APR_SUCCESS)) { |
| /* Soak up script output */ |
| discard_script_output(bb); |
| if (script_err) { |
| while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, |
| script_err) == APR_SUCCESS) |
| continue; |
| } |
| return ret; |
| } |
| |
| /* "%% [Wed Jun 19 10:53:21 1996] GET /cgid-bin/printenv HTTP/1.0" */ |
| apr_ctime(time_str, apr_time_now()); |
| apr_file_printf(f, "%%%% [%s] %s %s%s%s %s\n", time_str, r->method, r->uri, |
| r->args ? "?" : "", r->args ? r->args : "", r->protocol); |
| /* "%% 500 /usr/local/apache/cgid-bin" */ |
| apr_file_printf(f, "%%%% %d %s\n", ret, r->filename); |
| |
| apr_file_puts("%request\n", f); |
| for (i = 0; i < hdrs_arr->nelts; ++i) { |
| if (!hdrs[i].key) |
| continue; |
| apr_file_printf(f, "%s: %s\n", hdrs[i].key, hdrs[i].val); |
| } |
| if ((r->method_number == M_POST || r->method_number == M_PUT) |
| && *dbuf) { |
| apr_file_printf(f, "\n%s\n", dbuf); |
| } |
| |
| apr_file_puts("%response\n", f); |
| hdrs_arr = apr_table_elts(r->err_headers_out); |
| hdrs = (const apr_table_entry_t *) hdrs_arr->elts; |
| |
| for (i = 0; i < hdrs_arr->nelts; ++i) { |
| if (!hdrs[i].key) |
| continue; |
| apr_file_printf(f, "%s: %s\n", hdrs[i].key, hdrs[i].val); |
| } |
| |
| if (sbuf && *sbuf) |
| apr_file_printf(f, "%s\n", sbuf); |
| |
| first = 1; |
| |
| for (e = APR_BRIGADE_FIRST(bb); |
| e != APR_BRIGADE_SENTINEL(bb); |
| e = APR_BUCKET_NEXT(e)) |
| { |
| if (APR_BUCKET_IS_EOS(e)) { |
| break; |
| } |
| rv = apr_bucket_read(e, &buf, &len, APR_BLOCK_READ); |
| if (rv != APR_SUCCESS || (len == 0)) { |
| break; |
| } |
| if (first) { |
| apr_file_puts("%stdout\n", f); |
| first = 0; |
| } |
| apr_file_write(f, buf, &len); |
| apr_file_puts("\n", f); |
| } |
| |
| if (script_err) { |
| if (apr_file_gets(argsbuffer, HUGE_STRING_LEN, |
| script_err) == APR_SUCCESS) { |
| apr_file_puts("%stderr\n", f); |
| apr_file_puts(argsbuffer, f); |
| while (apr_file_gets(argsbuffer, HUGE_STRING_LEN, |
| script_err) == APR_SUCCESS) |
| apr_file_puts(argsbuffer, f); |
| apr_file_puts("\n", f); |
| } |
| } |
| |
| if (script_err) { |
| apr_file_close(script_err); |
| } |
| |
| apr_file_close(f); |
| return ret; |
| } |
| |
| static apr_status_t close_unix_socket(void *thefd) |
| { |
| int fd = (int)thefd; |
| |
| return close(fd); |
| } |
| |
| static int connect_to_daemon(int *sdptr, request_rec *r, |
| cgid_server_conf *conf) |
| { |
| struct sockaddr_un unix_addr; |
| int sd; |
| int connect_tries; |
| apr_interval_time_t sliding_timer; |
| |
| memset(&unix_addr, 0, sizeof(unix_addr)); |
| unix_addr.sun_family = AF_UNIX; |
| strcpy(unix_addr.sun_path, sockname); |
| |
| connect_tries = 0; |
| sliding_timer = 100000; /* 100 milliseconds */ |
| while (1) { |
| ++connect_tries; |
| if ((sd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { |
| return log_scripterror(r, conf, HTTP_INTERNAL_SERVER_ERROR, errno, |
| "unable to create socket to cgi daemon"); |
| } |
| if (connect(sd, (struct sockaddr *)&unix_addr, sizeof(unix_addr)) < 0) { |
| if (errno == ECONNREFUSED && connect_tries < DEFAULT_CONNECT_ATTEMPTS) { |
| ap_log_rerror(APLOG_MARK, APLOG_DEBUG, errno, r, |
| "connect #%d to cgi daemon failed, sleeping before retry", |
| connect_tries); |
| close(sd); |
| apr_sleep(sliding_timer); |
| if (sliding_timer < apr_time_from_sec(2)) { |
| sliding_timer *= 2; |
| } |
| } |
| else { |
| close(sd); |
| return log_scripterror(r, conf, HTTP_SERVICE_UNAVAILABLE, errno, |
| "unable to connect to cgi daemon after multiple tries"); |
| } |
| } |
| else { |
| apr_pool_cleanup_register(r->pool, (void *)sd, close_unix_socket, |
| apr_pool_cleanup_null); |
| break; /* we got connected! */ |
| } |
| /* gotta try again, but make sure the cgid daemon is still around */ |
| if (kill(daemon_pid, 0) != 0) { |
| return log_scripterror(r, conf, HTTP_SERVICE_UNAVAILABLE, errno, |
| "cgid daemon is gone; is Apache terminating?"); |
| } |
| } |
| *sdptr = sd; |
| return OK; |
| } |
| |
| static void discard_script_output(apr_bucket_brigade *bb) |
| { |
| apr_bucket *e; |
| const char *buf; |
| apr_size_t len; |
| apr_status_t rv; |
| |
| for (e = APR_BRIGADE_FIRST(bb); |
| e != APR_BRIGADE_SENTINEL(bb); |
| e = APR_BUCKET_NEXT(e)) |
| { |
| if (APR_BUCKET_IS_EOS(e)) { |
| break; |
| } |
| rv = apr_bucket_read(e, &buf, &len, APR_BLOCK_READ); |
| if (rv != APR_SUCCESS) { |
| break; |
| } |
| } |
| } |
| |
| /**************************************************************** |
| * |
| * Actual cgid handling... |
| */ |
| |
| struct cleanup_script_info { |
| request_rec *r; |
| unsigned long conn_id; |
| cgid_server_conf *conf; |
| }; |
| |
| static apr_status_t dead_yet(pid_t pid, apr_interval_time_t max_wait) |
| { |
| apr_interval_time_t interval = 10000; /* 10 ms */ |
| apr_interval_time_t total = 0; |
| |
| do { |
| #ifdef _AIX |
| /* On AIX, for processes like mod_cgid's script children where |
| * SIGCHLD is ignored, kill(pid,0) returns success for up to |
| * one second after the script child exits, based on when a |
| * daemon runs to clean up unnecessary process table entries. |
| * getpgid() can report the proper info (-1/ESRCH) immediately. |
| */ |
| if (getpgid(pid) < 0) { |
| #else |
| if (kill(pid, 0) < 0) { |
| #endif |
| return APR_SUCCESS; |
| } |
| apr_sleep(interval); |
| total = total + interval; |
| if (interval < 500000) { |
| interval *= 2; |
| } |
| } while (total < max_wait); |
| return APR_EGENERAL; |
| } |
| |
| static apr_status_t cleanup_nonchild_process(request_rec *r, pid_t pid) |
| { |
| kill(pid, SIGTERM); /* in case it isn't dead yet */ |
| if (dead_yet(pid, apr_time_from_sec(3)) == APR_SUCCESS) { |
| return APR_SUCCESS; |
| } |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, |
| "CGI process %" APR_PID_T_FMT " didn't exit, sending SIGKILL", |
| pid); |
| kill(pid, SIGKILL); |
| if (dead_yet(pid, apr_time_from_sec(3)) == APR_SUCCESS) { |
| return APR_SUCCESS; |
| } |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, |
| "CGI process %" APR_PID_T_FMT " didn't exit, sending SIGKILL again", |
| pid); |
| kill(pid, SIGKILL); |
| |
| return APR_EGENERAL; |
| } |
| |
| static apr_status_t cleanup_script(void *vptr) |
| { |
| struct cleanup_script_info *info = vptr; |
| int sd; |
| int rc; |
| cgid_req_t req = {0}; |
| pid_t pid; |
| apr_status_t stat; |
| |
| rc = connect_to_daemon(&sd, info->r, info->conf); |
| if (rc != OK) { |
| return APR_EGENERAL; |
| } |
| |
| /* we got a socket, and there is already a cleanup registered for it */ |
| |
| req.req_type = GETPID_REQ; |
| req.conn_id = info->r->connection->id; |
| |
| stat = sock_write(sd, &req, sizeof(req)); |
| if (stat != APR_SUCCESS) { |
| return stat; |
| } |
| |
| /* wait for pid of script */ |
| stat = sock_read(sd, &pid, sizeof(pid)); |
| if (stat != APR_SUCCESS) { |
| return stat; |
| } |
| |
| if (pid == 0) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, info->r, |
| "daemon couldn't find CGI process for connection %lu", |
| info->conn_id); |
| return APR_EGENERAL; |
| } |
| return cleanup_nonchild_process(info->r, pid); |
| } |
| |
| static int cgid_handler(request_rec *r) |
| { |
| conn_rec *c = r->connection; |
| int retval, nph, dbpos = 0; |
| char *argv0, *dbuf = NULL; |
| apr_bucket_brigade *bb; |
| apr_bucket *b; |
| cgid_server_conf *conf; |
| int is_included; |
| int seen_eos, child_stopped_reading; |
| int sd; |
| char **env; |
| apr_file_t *tempsock; |
| struct cleanup_script_info *info; |
| apr_status_t rv; |
| |
| if (strcmp(r->handler,CGI_MAGIC_TYPE) && strcmp(r->handler,"cgi-script")) |
| return DECLINED; |
| |
| if (r->method_number == M_OPTIONS) { |
| /* 99 out of 100 cgid scripts, this is all they support */ |
| r->allowed |= (AP_METHOD_BIT << M_GET); |
| r->allowed |= (AP_METHOD_BIT << M_POST); |
| return DECLINED; |
| } |
| |
| conf = ap_get_module_config(r->server->module_config, &cgid_module); |
| is_included = !strcmp(r->protocol, "INCLUDED"); |
| |
| if ((argv0 = strrchr(r->filename, '/')) != NULL) |
| argv0++; |
| else |
| argv0 = r->filename; |
| |
| nph = !(strncmp(argv0, "nph-", 4)); |
| |
| if ((argv0 = strrchr(r->filename, '/')) != NULL) |
| argv0++; |
| else |
| argv0 = r->filename; |
| |
| if (!(ap_allow_options(r) & OPT_EXECCGI) && !is_scriptaliased(r)) |
| return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, |
| "Options ExecCGI is off in this directory"); |
| if (nph && is_included) |
| return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, |
| "attempt to include NPH CGI script"); |
| |
| #if defined(OS2) || defined(WIN32) |
| #error mod_cgid does not work on this platform. If you teach it to, look |
| #error at mod_cgi.c for required code in this path. |
| #else |
| if (r->finfo.filetype == 0) |
| return log_scripterror(r, conf, HTTP_NOT_FOUND, 0, |
| "script not found or unable to stat"); |
| #endif |
| if (r->finfo.filetype == APR_DIR) |
| return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, |
| "attempt to invoke directory as script"); |
| |
| if ((r->used_path_info == AP_REQ_REJECT_PATH_INFO) && |
| r->path_info && *r->path_info) |
| { |
| /* default to accept */ |
| return log_scripterror(r, conf, HTTP_NOT_FOUND, 0, |
| "AcceptPathInfo off disallows user's path"); |
| } |
| /* |
| if (!ap_suexec_enabled) { |
| if (!ap_can_exec(&r->finfo)) |
| return log_scripterror(r, conf, HTTP_FORBIDDEN, 0, |
| "file permissions deny server execution"); |
| } |
| */ |
| ap_add_common_vars(r); |
| ap_add_cgi_vars(r); |
| env = ap_create_environment(r->pool, r->subprocess_env); |
| |
| if ((retval = connect_to_daemon(&sd, r, conf)) != OK) { |
| return retval; |
| } |
| |
| rv = send_req(sd, r, argv0, env, CGI_REQ); |
| if (rv != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, |
| "write to cgi daemon process"); |
| } |
| |
| info = apr_palloc(r->pool, sizeof(struct cleanup_script_info)); |
| info->r = r; |
| info->conn_id = r->connection->id; |
| info->conf = conf; |
| apr_pool_cleanup_register(r->pool, info, |
| cleanup_script, |
| apr_pool_cleanup_null); |
| /* We are putting the socket discriptor into an apr_file_t so that we can |
| * use a pipe bucket to send the data to the client. APR will create |
| * a cleanup for the apr_file_t which will close the socket, so we'll |
| * get rid of the cleanup we registered when we created the socket. |
| */ |
| |
| apr_os_pipe_put_ex(&tempsock, &sd, 1, r->pool); |
| apr_pool_cleanup_kill(r->pool, (void *)sd, close_unix_socket); |
| |
| if ((argv0 = strrchr(r->filename, '/')) != NULL) |
| argv0++; |
| else |
| argv0 = r->filename; |
| |
| /* Transfer any put/post args, CERN style... |
| * Note that we already ignore SIGPIPE in the core server. |
| */ |
| bb = apr_brigade_create(r->pool, r->connection->bucket_alloc); |
| seen_eos = 0; |
| child_stopped_reading = 0; |
| if (conf->logname) { |
| dbuf = apr_palloc(r->pool, conf->bufbytes + 1); |
| dbpos = 0; |
| } |
| do { |
| apr_bucket *bucket; |
| |
| rv = ap_get_brigade(r->input_filters, bb, AP_MODE_READBYTES, |
| APR_BLOCK_READ, HUGE_STRING_LEN); |
| |
| if (rv != APR_SUCCESS) { |
| return rv; |
| } |
| |
| for (bucket = APR_BRIGADE_FIRST(bb); |
| bucket != APR_BRIGADE_SENTINEL(bb); |
| bucket = APR_BUCKET_NEXT(bucket)) |
| { |
| const char *data; |
| apr_size_t len; |
| |
| if (APR_BUCKET_IS_EOS(bucket)) { |
| seen_eos = 1; |
| break; |
| } |
| |
| /* We can't do much with this. */ |
| if (APR_BUCKET_IS_FLUSH(bucket)) { |
| continue; |
| } |
| |
| /* If the child stopped, we still must read to EOS. */ |
| if (child_stopped_reading) { |
| continue; |
| } |
| |
| /* read */ |
| apr_bucket_read(bucket, &data, &len, APR_BLOCK_READ); |
| |
| if (conf->logname && dbpos < conf->bufbytes) { |
| int cursize; |
| |
| if ((dbpos + len) > conf->bufbytes) { |
| cursize = conf->bufbytes - dbpos; |
| } |
| else { |
| cursize = len; |
| } |
| memcpy(dbuf + dbpos, data, cursize); |
| dbpos += cursize; |
| } |
| |
| /* Keep writing data to the child until done or too much time |
| * elapses with no progress or an error occurs. |
| */ |
| rv = apr_file_write_full(tempsock, data, len, NULL); |
| |
| if (rv != APR_SUCCESS) { |
| /* silly script stopped reading, soak up remaining message */ |
| child_stopped_reading = 1; |
| } |
| } |
| apr_brigade_cleanup(bb); |
| } |
| while (!seen_eos); |
| |
| if (conf->logname) { |
| dbuf[dbpos] = '\0'; |
| } |
| |
| /* we're done writing, or maybe we didn't write at all; |
| * force EOF on child's stdin so that the cgi detects end (or |
| * absence) of data |
| */ |
| shutdown(sd, 1); |
| |
| /* Handle script return... */ |
| if (!nph) { |
| const char *location; |
| char sbuf[MAX_STRING_LEN]; |
| int ret; |
| |
| bb = apr_brigade_create(r->pool, c->bucket_alloc); |
| b = apr_bucket_pipe_create(tempsock, c->bucket_alloc); |
| APR_BRIGADE_INSERT_TAIL(bb, b); |
| b = apr_bucket_eos_create(c->bucket_alloc); |
| APR_BRIGADE_INSERT_TAIL(bb, b); |
| |
| if ((ret = ap_scan_script_header_err_brigade(r, bb, sbuf))) { |
| return log_script(r, conf, ret, dbuf, sbuf, bb, NULL); |
| } |
| |
| location = apr_table_get(r->headers_out, "Location"); |
| |
| if (location && location[0] == '/' && r->status == 200) { |
| |
| /* Soak up all the script output */ |
| discard_script_output(bb); |
| apr_brigade_destroy(bb); |
| /* This redirect needs to be a GET no matter what the original |
| * method was. |
| */ |
| r->method = apr_pstrdup(r->pool, "GET"); |
| r->method_number = M_GET; |
| |
| /* We already read the message body (if any), so don't allow |
| * the redirected request to think it has one. We can ignore |
| * Transfer-Encoding, since we used REQUEST_CHUNKED_ERROR. |
| */ |
| apr_table_unset(r->headers_in, "Content-Length"); |
| |
| ap_internal_redirect_handler(location, r); |
| return OK; |
| } |
| else if (location && r->status == 200) { |
| /* XX Note that if a script wants to produce its own Redirect |
| * body, it now has to explicitly *say* "Status: 302" |
| */ |
| discard_script_output(bb); |
| apr_brigade_destroy(bb); |
| return HTTP_MOVED_TEMPORARILY; |
| } |
| |
| ap_pass_brigade(r->output_filters, bb); |
| } |
| |
| if (nph) { |
| struct ap_filter_t *cur; |
| |
| /* get rid of all filters up through protocol... since we |
| * haven't parsed off the headers, there is no way they can |
| * work |
| */ |
| |
| cur = r->proto_output_filters; |
| while (cur && cur->frec->ftype < AP_FTYPE_CONNECTION) { |
| cur = cur->next; |
| } |
| r->output_filters = r->proto_output_filters = cur; |
| |
| bb = apr_brigade_create(r->pool, c->bucket_alloc); |
| b = apr_bucket_pipe_create(tempsock, c->bucket_alloc); |
| APR_BRIGADE_INSERT_TAIL(bb, b); |
| b = apr_bucket_eos_create(c->bucket_alloc); |
| APR_BRIGADE_INSERT_TAIL(bb, b); |
| ap_pass_brigade(r->output_filters, bb); |
| } |
| |
| return OK; /* NOT r->status, even if it has changed. */ |
| } |
| |
| |
| |
| |
| /*============================================================================ |
| *============================================================================ |
| * This is the beginning of the cgi filter code moved from mod_include. This |
| * is the code required to handle the "exec" SSI directive. |
| *============================================================================ |
| *============================================================================*/ |
| static apr_status_t include_cgi(include_ctx_t *ctx, ap_filter_t *f, |
| apr_bucket_brigade *bb, char *s) |
| { |
| request_rec *r = f->r; |
| request_rec *rr = ap_sub_req_lookup_uri(s, r, f->next); |
| int rr_status; |
| |
| if (rr->status != HTTP_OK) { |
| ap_destroy_sub_req(rr); |
| return APR_EGENERAL; |
| } |
| |
| /* No hardwired path info or query allowed */ |
| if ((rr->path_info && rr->path_info[0]) || rr->args) { |
| ap_destroy_sub_req(rr); |
| return APR_EGENERAL; |
| } |
| if (rr->finfo.filetype != APR_REG) { |
| ap_destroy_sub_req(rr); |
| return APR_EGENERAL; |
| } |
| |
| /* Script gets parameters of the *document*, for back compatibility */ |
| rr->path_info = r->path_info; /* hard to get right; see mod_cgi.c */ |
| rr->args = r->args; |
| |
| /* Force sub_req to be treated as a CGI request, even if ordinary |
| * typing rules would have called it something else. |
| */ |
| ap_set_content_type(rr, CGI_MAGIC_TYPE); |
| |
| /* Run it. */ |
| rr_status = ap_run_sub_req(rr); |
| if (ap_is_HTTP_REDIRECT(rr_status)) { |
| const char *location = apr_table_get(rr->headers_out, "Location"); |
| |
| if (location) { |
| char *buffer; |
| |
| location = ap_escape_html(rr->pool, location); |
| buffer = apr_pstrcat(ctx->pool, "<a href=\"", location, "\">", |
| location, "</a>", NULL); |
| |
| APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_pool_create(buffer, |
| strlen(buffer), ctx->pool, |
| f->c->bucket_alloc)); |
| } |
| } |
| |
| ap_destroy_sub_req(rr); |
| |
| return APR_SUCCESS; |
| } |
| |
| /* This is the special environment used for running the "exec cmd=" |
| * variety of SSI directives. |
| */ |
| static void add_ssi_vars(request_rec *r) |
| { |
| apr_table_t *e = r->subprocess_env; |
| |
| if (r->path_info && r->path_info[0] != '\0') { |
| request_rec *pa_req; |
| |
| apr_table_setn(e, "PATH_INFO", ap_escape_shell_cmd(r->pool, r->path_info)); |
| |
| pa_req = ap_sub_req_lookup_uri(ap_escape_uri(r->pool, r->path_info), r, NULL); |
| if (pa_req->filename) { |
| apr_table_setn(e, "PATH_TRANSLATED", |
| apr_pstrcat(r->pool, pa_req->filename, pa_req->path_info, NULL)); |
| } |
| ap_destroy_sub_req(pa_req); |
| } |
| |
| if (r->args) { |
| char *arg_copy = apr_pstrdup(r->pool, r->args); |
| |
| apr_table_setn(e, "QUERY_STRING", r->args); |
| ap_unescape_url(arg_copy); |
| apr_table_setn(e, "QUERY_STRING_UNESCAPED", ap_escape_shell_cmd(r->pool, arg_copy)); |
| } |
| } |
| |
| static int include_cmd(include_ctx_t *ctx, ap_filter_t *f, |
| apr_bucket_brigade *bb, char *command) |
| { |
| char **env; |
| int sd; |
| int retval; |
| apr_file_t *tempsock = NULL; |
| request_rec *r = f->r; |
| cgid_server_conf *conf = ap_get_module_config(r->server->module_config, |
| &cgid_module); |
| struct cleanup_script_info *info; |
| |
| add_ssi_vars(r); |
| env = ap_create_environment(r->pool, r->subprocess_env); |
| |
| if ((retval = connect_to_daemon(&sd, r, conf)) != OK) { |
| return retval; |
| } |
| |
| send_req(sd, r, command, env, SSI_REQ); |
| |
| info = apr_palloc(r->pool, sizeof(struct cleanup_script_info)); |
| info->r = r; |
| info->conn_id = r->connection->id; |
| info->conf = conf; |
| /* for this type of request, the script is invoked through an |
| * intermediate shell process... cleanup_script is only able |
| * to knock out the shell process, not the actual script |
| */ |
| apr_pool_cleanup_register(r->pool, info, |
| cleanup_script, |
| apr_pool_cleanup_null); |
| |
| /* We are putting the socket discriptor into an apr_file_t so that we can |
| * use a pipe bucket to send the data to the client. APR will create |
| * a cleanup for the apr_file_t which will close the socket, so we'll |
| * get rid of the cleanup we registered when we created the socket. |
| */ |
| apr_os_pipe_put_ex(&tempsock, &sd, 1, r->pool); |
| apr_pool_cleanup_kill(r->pool, (void *)sd, close_unix_socket); |
| |
| APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_pipe_create(tempsock, |
| f->c->bucket_alloc)); |
| ctx->flush_now = 1; |
| |
| return APR_SUCCESS; |
| } |
| |
| static apr_status_t handle_exec(include_ctx_t *ctx, ap_filter_t *f, |
| apr_bucket_brigade *bb) |
| { |
| char *tag = NULL; |
| char *tag_val = NULL; |
| request_rec *r = f->r; |
| char *file = r->filename; |
| char parsed_string[MAX_STRING_LEN]; |
| |
| if (!ctx->argc) { |
| ap_log_rerror(APLOG_MARK, |
| (ctx->flags & SSI_FLAG_PRINTING) |
| ? APLOG_ERR : APLOG_WARNING, |
| 0, r, "missing argument for exec element in %s", |
| r->filename); |
| } |
| |
| if (!(ctx->flags & SSI_FLAG_PRINTING)) { |
| return APR_SUCCESS; |
| } |
| |
| if (!ctx->argc) { |
| SSI_CREATE_ERROR_BUCKET(ctx, f, bb); |
| return APR_SUCCESS; |
| } |
| |
| if (ctx->flags & SSI_FLAG_NO_EXEC) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "exec used but not allowed " |
| "in %s", r->filename); |
| SSI_CREATE_ERROR_BUCKET(ctx, f, bb); |
| return APR_SUCCESS; |
| } |
| |
| while (1) { |
| cgid_pfn_gtv(ctx, &tag, &tag_val, SSI_VALUE_DECODED); |
| if (!tag || !tag_val) { |
| break; |
| } |
| |
| if (!strcmp(tag, "cmd")) { |
| apr_status_t rv; |
| |
| cgid_pfn_ps(ctx, tag_val, parsed_string, sizeof(parsed_string), |
| SSI_EXPAND_LEAVE_NAME); |
| |
| rv = include_cmd(ctx, f, bb, parsed_string); |
| if (rv != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, |
| "execution failure for parameter \"%s\" " |
| "to tag exec in file %s", tag, r->filename); |
| SSI_CREATE_ERROR_BUCKET(ctx, f, bb); |
| break; |
| } |
| } |
| else if (!strcmp(tag, "cgi")) { |
| apr_status_t rv; |
| |
| cgid_pfn_ps(ctx, tag_val, parsed_string, sizeof(parsed_string), |
| SSI_EXPAND_DROP_NAME); |
| |
| rv = include_cgi(ctx, f, bb, parsed_string); |
| if (rv != APR_SUCCESS) { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "invalid CGI ref " |
| "\"%s\" in %s", tag_val, file); |
| SSI_CREATE_ERROR_BUCKET(ctx, f, bb); |
| break; |
| } |
| } |
| else { |
| ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "unknown parameter " |
| "\"%s\" to tag exec in %s", tag, file); |
| SSI_CREATE_ERROR_BUCKET(ctx, f, bb); |
| break; |
| } |
| } |
| |
| return APR_SUCCESS; |
| } |
| /*============================================================================ |
| *============================================================================ |
| * This is the end of the cgi filter code moved from mod_include. |
| *============================================================================ |
| *============================================================================*/ |
| |
| |
| static void register_hook(apr_pool_t *p) |
| { |
| static const char * const aszPre[] = { "mod_include.c", NULL }; |
| |
| ap_hook_pre_config(cgid_pre_config, NULL, NULL, APR_HOOK_MIDDLE); |
| ap_hook_post_config(cgid_init, aszPre, NULL, APR_HOOK_MIDDLE); |
| ap_hook_handler(cgid_handler, NULL, NULL, APR_HOOK_MIDDLE); |
| } |
| |
| module AP_MODULE_DECLARE_DATA cgid_module = { |
| STANDARD20_MODULE_STUFF, |
| NULL, /* dir config creater */ |
| NULL, /* dir merger --- default is to override */ |
| create_cgid_config, /* server config */ |
| merge_cgid_config, /* merge server config */ |
| cgid_cmds, /* command table */ |
| register_hook /* register_handlers */ |
| }; |
| |