This is a drop in replacement that fixes bug 22898

mod_cgi.c (text/plain), 41.15 KB, created by Ben Griffin on 2006-02-25 00:35:53 UTC

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Description: This is a drop in replacement that fixes bug 22898

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Creator: Ben Griffin

Created: 2006-02-25 00:35:53 UTC

Size: 41.15 KB

patch

obsolete

>/* Copyright 1999-2005 The Apache Software Foundation or its licensors, as > * applicable. > * > * 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.h" >#include "apr_strings.h" >#include "apr_thread_proc.h" /* for RLIMIT stuff */ >#include "apr_optional.h" >#include "apr_buckets.h" >#include "apr_lib.h" >#include "apr_poll.h" > >#define APR_WANT_STRFUNC >#define APR_WANT_MEMFUNC >#include "apr_want.h" > >#define CORE_PRIVATE > >#include "util_filter.h" >#include "ap_config.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 "mod_core.h" >#include "mod_cgi.h" > >module AP_MODULE_DECLARE_DATA cgi_module; > >static APR_OPTIONAL_FN_TYPE(ap_register_include_handler) *cgi_pfn_reg_with_ssi; >static APR_OPTIONAL_FN_TYPE(ap_ssi_get_tag_and_value) *cgi_pfn_gtv; >static APR_OPTIONAL_FN_TYPE(ap_ssi_parse_string) *cgi_pfn_ps; >static APR_OPTIONAL_FN_TYPE(ap_cgi_build_command) *cgi_build_command; > >/* 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 > >typedef struct { > const char *logname; > long logbytes; > apr_size_t bufbytes; >} cgi_server_conf; > >static void *create_cgi_config(apr_pool_t *p, server_rec *s) >{ > cgi_server_conf *c = > (cgi_server_conf *) apr_pcalloc(p, sizeof(cgi_server_conf)); > > c->logname = NULL; > c->logbytes = DEFAULT_LOGBYTES; > c->bufbytes = DEFAULT_BUFBYTES; > > return c; >} > >static void *merge_cgi_config(apr_pool_t *p, void *basev, void *overridesv) >{ > cgi_server_conf *base = (cgi_server_conf *) basev, > *overrides = (cgi_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; > cgi_server_conf *conf = ap_get_module_config(s->module_config, > &cgi_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; > cgi_server_conf *conf = ap_get_module_config(s->module_config, > &cgi_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; > cgi_server_conf *conf = ap_get_module_config(s->module_config, > &cgi_module); > > conf->bufbytes = atoi(arg); > return NULL; >} > >static const command_rec cgi_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"), > {NULL} >}; > >static int log_scripterror(request_rec *r, cgi_server_conf * conf, int ret, > apr_status_t rv, char *error) >{ > apr_file_t *f = NULL; > apr_finfo_t 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 || > ((apr_stat(&finfo, conf->logname, > APR_FINFO_SIZE, r->pool) == APR_SUCCESS) && > (finfo.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 /cgi-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/cgi-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; >} > >/* Soak up stderr from a script and redirect it to the error log. > */ >static apr_status_t log_script_err(request_rec *r, apr_file_t *script_err) >{ > char argsbuffer[HUGE_STRING_LEN]; > char *newline; > apr_status_t rv; > > while ((rv = apr_file_gets(argsbuffer, HUGE_STRING_LEN, > script_err)) == APR_SUCCESS) { > newline = strchr(argsbuffer, '\n'); > if (newline) { > *newline = '\0'; > } > ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, > "%s", argsbuffer); > } > > return rv; >} > >static int log_script(request_rec *r, cgi_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 = (const 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; > apr_finfo_t finfo; > char time_str[APR_CTIME_LEN]; > > /* XXX Very expensive mainline case! Open, then getfileinfo! */ > if (!conf->logname || > ((apr_stat(&finfo, conf->logname, > APR_FINFO_SIZE, r->pool) == APR_SUCCESS) && > (finfo.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); > log_script_err(r, script_err); > return ret; > } > > /* "%% [Wed Jun 19 10:53:21 1996] GET /cgi-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/cgi-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 (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); > } > > apr_brigade_destroy(bb); > apr_file_close(script_err); > > apr_file_close(f); > return ret; >} > > >/* 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 void cgi_child_errfn(apr_pool_t *pool, apr_status_t err, > const char *description) >{ > apr_file_t *stderr_log; > char errbuf[200]; > > apr_file_open_stderr(&stderr_log, pool); > /* Escape the logged string because it may be something that > * came in over the network. > */ > apr_file_printf(stderr_log, > "(%d)%s: %s\n", > err, > apr_strerror(err, errbuf, sizeof(errbuf)), >#ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED > ap_escape_logitem(pool, >#endif > description >#ifndef AP_UNSAFE_ERROR_LOG_UNESCAPED > ) >#endif > ); >} > >static apr_status_t run_cgi_child(apr_file_t **script_out, > apr_file_t **script_in, > apr_file_t **script_err, > const char *command, > const char * const argv[], > request_rec *r, > apr_pool_t *p, > cgi_exec_info_t *e_info) >{ > const char * const *env; > apr_procattr_t *procattr; > apr_proc_t *procnew; > apr_status_t rc = APR_SUCCESS; > >#if defined(RLIMIT_CPU) || defined(RLIMIT_NPROC) || \ > defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined (RLIMIT_AS) > > core_dir_config *conf = ap_get_module_config(r->per_dir_config, > &core_module); >#endif > >#ifdef DEBUG_CGI >#ifdef OS2 > /* Under OS/2 need to use device con. */ > FILE *dbg = fopen("con", "w"); >#else > FILE *dbg = fopen("/dev/tty", "w"); >#endif > int i; >#endif > > RAISE_SIGSTOP(CGI_CHILD); >#ifdef DEBUG_CGI > fprintf(dbg, "Attempting to exec %s as CGI child (argv0 = %s)\n", > r->filename, argv[0]); >#endif > > env = (const char * const *)ap_create_environment(p, r->subprocess_env); > >#ifdef DEBUG_CGI > fprintf(dbg, "Environment: \n"); > for (i = 0; env[i]; ++i) > fprintf(dbg, "'%s'\n", env[i]); >#endif > > /* Transmute ourselves into the script. > * NB only ISINDEX scripts get decoded arguments. > */ > if (((rc = apr_procattr_create(&procattr, p)) != APR_SUCCESS) || > ((rc = apr_procattr_io_set(procattr, > e_info->in_pipe, > e_info->out_pipe, > e_info->err_pipe)) != APR_SUCCESS) || > ((rc = apr_procattr_dir_set(procattr, > ap_make_dirstr_parent(r->pool, > r->filename))) != APR_SUCCESS) || >#ifdef RLIMIT_CPU > ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_CPU, > conf->limit_cpu)) != APR_SUCCESS) || >#endif >#if defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS) > ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_MEM, > conf->limit_mem)) != APR_SUCCESS) || >#endif >#ifdef RLIMIT_NPROC > ((rc = apr_procattr_limit_set(procattr, APR_LIMIT_NPROC, > conf->limit_nproc)) != APR_SUCCESS) || >#endif > ((rc = apr_procattr_cmdtype_set(procattr, > e_info->cmd_type)) != APR_SUCCESS) || > > ((rc = apr_procattr_detach_set(procattr, > e_info->detached)) != APR_SUCCESS) || > ((rc = apr_procattr_addrspace_set(procattr, > e_info->addrspace)) != APR_SUCCESS) || > ((rc = apr_procattr_child_errfn_set(procattr, cgi_child_errfn)) != APR_SUCCESS)) { > /* Something bad happened, tell the world. */ > ap_log_rerror(APLOG_MARK, APLOG_ERR, rc, r, > "couldn't set child process attributes: %s", r->filename); > } > else { > procnew = apr_pcalloc(p, sizeof(*procnew)); > rc = ap_os_create_privileged_process(r, procnew, command, argv, env, > procattr, p); > > if (rc != APR_SUCCESS) { > /* Bad things happened. Everyone should have cleaned up. */ > ap_log_rerror(APLOG_MARK, APLOG_ERR|APLOG_TOCLIENT, rc, r, > "couldn't create child process: %d: %s", rc, > apr_filepath_name_get(r->filename)); > } > else { > apr_pool_note_subprocess(p, procnew, APR_KILL_AFTER_TIMEOUT); > > *script_in = procnew->out; > if (!*script_in) > return APR_EBADF; > apr_file_pipe_timeout_set(*script_in, r->server->timeout); > > if (e_info->prog_type == RUN_AS_CGI) { > *script_out = procnew->in; > if (!*script_out) > return APR_EBADF; > apr_file_pipe_timeout_set(*script_out, r->server->timeout); > > *script_err = procnew->err; > if (!*script_err) > return APR_EBADF; > apr_file_pipe_timeout_set(*script_err, r->server->timeout); > } > } > } >#ifdef DEBUG_CGI > fclose(dbg); >#endif > return (rc); >} > > >static apr_status_t default_build_command(const char **cmd, const char ***argv, > request_rec *r, apr_pool_t *p, > cgi_exec_info_t *e_info) >{ > int numwords, x, idx; > char *w; > const char *args = NULL; > > if (e_info->process_cgi) { > *cmd = r->filename; > /* Do not process r->args if they contain an '=' assignment > */ > if (r->args && r->args[0] && !ap_strchr_c(r->args, '=')) { > args = r->args; > } > } > > if (!args) { > numwords = 1; > } > else { > /* count the number of keywords */ > for (x = 0, numwords = 2; args[x]; x++) { > if (args[x] == '+') { > ++numwords; > } > } > } > /* Everything is - 1 to account for the first parameter > * which is the program name. > */ > if (numwords > APACHE_ARG_MAX - 1) { > numwords = APACHE_ARG_MAX - 1; /* Truncate args to prevent overrun */ > } > *argv = apr_palloc(p, (numwords + 2) * sizeof(char *)); > (*argv)[0] = *cmd; > for (x = 1, idx = 1; x < numwords; x++) { > w = ap_getword_nulls(p, &args, '+'); > ap_unescape_url(w); > (*argv)[idx++] = ap_escape_shell_cmd(p, w); > } > (*argv)[idx] = NULL; > > return APR_SUCCESS; >} > >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; > } > } >} > >#if APR_FILES_AS_SOCKETS > >/* A CGI bucket type is needed to catch any output to stderr from the > * script; see PR 22030. */ >static const apr_bucket_type_t bucket_type_cgi; > >struct cgi_bucket_data { > apr_pollset_t *pollset; > request_rec *r; >}; > >/* Create a CGI bucket using pipes from script stdout 'out' > * and stderr 'err', for request 'r'. */ >static apr_bucket *cgi_bucket_create(request_rec *r, > apr_file_t *out, apr_file_t *err, > apr_bucket_alloc_t *list) >{ > apr_bucket *b = apr_bucket_alloc(sizeof(*b), list); > apr_status_t rv; > apr_pollfd_t fd; > struct cgi_bucket_data *data = apr_palloc(r->pool, sizeof *data); > > APR_BUCKET_INIT(b); > b->free = apr_bucket_free; > b->list = list; > b->type = &bucket_type_cgi; > b->length = (apr_size_t)(-1); > b->start = -1; > > /* Create the pollset */ > rv = apr_pollset_create(&data->pollset, 2, r->pool, 0); > AP_DEBUG_ASSERT(rv == APR_SUCCESS); > > fd.desc_type = APR_POLL_FILE; > fd.reqevents = APR_POLLIN; > fd.p = r->pool; > fd.desc.f = out; /* script's stdout */ > fd.client_data = (void *)1; > rv = apr_pollset_add(data->pollset, &fd); > AP_DEBUG_ASSERT(rv == APR_SUCCESS); > > fd.desc.f = err; /* script's stderr */ > fd.client_data = (void *)2; > rv = apr_pollset_add(data->pollset, &fd); > AP_DEBUG_ASSERT(rv == APR_SUCCESS); > > data->r = r; > b->data = data; > return b; >} > >/* Create a duplicate CGI bucket using given bucket data */ >static apr_bucket *cgi_bucket_dup(struct cgi_bucket_data *data, > apr_bucket_alloc_t *list) >{ > apr_bucket *b = apr_bucket_alloc(sizeof(*b), list); > APR_BUCKET_INIT(b); > b->free = apr_bucket_free; > b->list = list; > b->type = &bucket_type_cgi; > b->length = (apr_size_t)(-1); > b->start = -1; > b->data = data; > return b; >} > >/* Handle stdout from CGI child. Duplicate of logic from the _read > * method of the real APR pipe bucket implementation. */ >static apr_status_t cgi_read_stdout(apr_bucket *a, apr_file_t *out, > const char **str, apr_size_t *len) >{ > char *buf; > apr_status_t rv; > > *str = NULL; > *len = APR_BUCKET_BUFF_SIZE; > buf = apr_bucket_alloc(*len, a->list); /* XXX: check for failure? */ > > rv = apr_file_read(out, buf, len); > > if (rv != APR_SUCCESS && rv != APR_EOF) { > apr_bucket_free(buf); > return rv; > } > > if (*len > 0) { > struct cgi_bucket_data *data = a->data; > apr_bucket_heap *h; > > /* Change the current bucket to refer to what we read */ > a = apr_bucket_heap_make(a, buf, *len, apr_bucket_free); > h = a->data; > h->alloc_len = APR_BUCKET_BUFF_SIZE; /* note the real buffer size */ > *str = buf; > APR_BUCKET_INSERT_AFTER(a, cgi_bucket_dup(data, a->list)); > } > else { > apr_bucket_free(buf); > a = apr_bucket_immortal_make(a, "", 0); > *str = a->data; > } > return rv; >} > >/* Read method of CGI bucket: polls on stderr and stdout of the child, > * sending any stderr output immediately away to the error log. */ >static apr_status_t cgi_bucket_read(apr_bucket *b, const char **str, > apr_size_t *len, apr_read_type_e block) >{ > struct cgi_bucket_data *data = b->data; > apr_interval_time_t timeout; > apr_status_t rv; > int gotdata = 0; > > timeout = block == APR_NONBLOCK_READ ? 0 : data->r->server->timeout; > > do { > const apr_pollfd_t *results; > apr_int32_t num; > > rv = apr_pollset_poll(data->pollset, timeout, &num, &results); > if (APR_STATUS_IS_TIMEUP(rv)) { > if (timeout) { > ap_log_rerror(APLOG_MARK, APLOG_WARNING, 0, data->r, > "Timeout waiting for output from CGI script %s", > data->r->filename); > return rv; > } > else { > return APR_EAGAIN; > } > } > else if (APR_STATUS_IS_EINTR(rv)) { > continue; > } > else if (rv != APR_SUCCESS) { > ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, data->r, > "poll failed waiting for CGI child"); > return rv; > } > > for (; num; num--, results++) { > if (results[0].client_data == (void *)1) { > /* stdout */ > rv = cgi_read_stdout(b, results[0].desc.f, str, len); > if (APR_STATUS_IS_EOF(rv)) { > rv = APR_SUCCESS; > } > gotdata = 1; > } else { > /* stderr */ > apr_status_t rv2 = log_script_err(data->r, results[0].desc.f); > if (APR_STATUS_IS_EOF(rv2)) { > apr_pollset_remove(data->pollset, &results[0]); > } > } > } > > } while (!gotdata); > > return rv; >} > >static const apr_bucket_type_t bucket_type_cgi = { > "CGI", 5, APR_BUCKET_DATA, > apr_bucket_destroy_noop, > cgi_bucket_read, > apr_bucket_setaside_notimpl, > apr_bucket_split_notimpl, > apr_bucket_copy_notimpl >}; > >#endif > >static int cgi_handler(request_rec *r) >{ > int nph; > apr_size_t dbpos = 0; > const char *argv0; > const char *command; > const char **argv; > char *dbuf = NULL; > apr_file_t *script_out = NULL, *script_in = NULL, *script_err = NULL; > apr_bucket_brigade *bb; > apr_bucket *b; > int is_included; > int seen_eos, child_stopped_reading; > apr_pool_t *p; > cgi_server_conf *conf; > apr_status_t rv; > cgi_exec_info_t e_info; > conn_rec *c = r->connection; > > if(strcmp(r->handler, CGI_MAGIC_TYPE) && strcmp(r->handler, "cgi-script")) > return DECLINED; > > is_included = !strcmp(r->protocol, "INCLUDED"); > > p = r->main ? r->main->pool : r->pool; > > argv0 = apr_filepath_name_get(r->filename); > ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Identifying cgi script:%s", r->filename); > nph = ( strstr(argv0,"nph-") != NULL ); > if (nph) > ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Identified an nph-cgi script"); > else > ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Identified a non nph-cgi script"); > > conf = ap_get_module_config(r->server->module_config, &cgi_module); > > 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 (r->finfo.filetype == 0) > return log_scripterror(r, conf, HTTP_NOT_FOUND, 0, > "script not found or unable to stat"); > 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); > > e_info.process_cgi = 1; > e_info.cmd_type = APR_PROGRAM; > e_info.detached = 0; > e_info.in_pipe = APR_CHILD_BLOCK; > e_info.out_pipe = APR_CHILD_BLOCK; > e_info.err_pipe = APR_CHILD_BLOCK; > e_info.prog_type = RUN_AS_CGI; > e_info.bb = NULL; > e_info.ctx = NULL; > e_info.next = NULL; > e_info.addrspace = 0; > > /* build the command line */ > if ((rv = cgi_build_command(&command, &argv, r, p, &e_info)) != APR_SUCCESS) { > ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, > "don't know how to spawn child process: %s", > r->filename); > return HTTP_INTERNAL_SERVER_ERROR; > } > > /* run the script in its own process */ > if ((rv = run_cgi_child(&script_out, &script_in, &script_err, > command, argv, r, p, &e_info)) != APR_SUCCESS) { > ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, > "couldn't spawn child process: %s", r->filename); > return HTTP_INTERNAL_SERVER_ERROR; > } > > /* Transfer any put/post args, CERN style... > * Note that we already ignore SIGPIPE in the core server. > */ > bb = apr_brigade_create(r->pool, c->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(script_out, 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'; > } > /* Is this flush really needed? */ > apr_file_flush(script_out); > apr_file_close(script_out); > > AP_DEBUG_ASSERT(script_in != NULL); > > apr_brigade_cleanup(bb); > >#if APR_FILES_AS_SOCKETS > apr_file_pipe_timeout_set(script_in, 0); > apr_file_pipe_timeout_set(script_err, 0); > > b = cgi_bucket_create(r, script_in, script_err, c->bucket_alloc); >#else > b = apr_bucket_pipe_create(script_in, c->bucket_alloc); >#endif > APR_BRIGADE_INSERT_TAIL(bb, b); > b = apr_bucket_eos_create(c->bucket_alloc); > APR_BRIGADE_INSERT_TAIL(bb, b); > > /* Handle script return... */ > if (!nph) { > const char *location; > char sbuf[MAX_STRING_LEN]; > int ret; > > if ((ret = ap_scan_script_header_err_brigade(r, bb, sbuf))) { > ret = log_script(r, conf, ret, dbuf, sbuf, bb, script_err); > > /* Set our status. */ > r->status = ret; > > /* Pass EOS bucket down the filter chain. */ > apr_brigade_cleanup(bb); > b = apr_bucket_eos_create(c->bucket_alloc); > APR_BRIGADE_INSERT_TAIL(bb, b); > ap_pass_brigade(r->output_filters, bb); > > return ret; > } > > location = apr_table_get(r->headers_out, "Location"); > > if (location && r->status == 200) { > /* For a redirect whether internal or not, discard any > * remaining stdout from the script, and log any remaining > * stderr output, as normal. */ > discard_script_output(bb); > apr_brigade_destroy(bb); > apr_file_pipe_timeout_set(script_err, r->server->timeout); > log_script_err(r, script_err); > } > > if (location && location[0] == '/' && r->status == 200) { > /* 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" > */ > return HTTP_MOVED_TEMPORARILY; > } > > rv = ap_pass_brigade(r->output_filters, bb); > } > else /* nph */ { > /* Now get rid of all filters up through protocol... since we > * haven't parsed off the headers, there is no way they can > * work > */ >/* check to see if r is the main request - or are we going through an Action */ > if (ap_is_initial_req(r) != 1) { > request_rec* rp = r->prev; > ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "This request is a sub %d",rp); > struct ap_filter_t *mof; > mof = rp->output_filters; > while ( mof ) { > ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Found filter: %s",mof->frec->name); > mof = mof->next; > } > mof = rp->connection->output_filters; > while ( mof && mof->frec->ftype < AP_FTYPE_TRANSCODE ) { > mof = mof->next; > } > rp->connection->output_filters = rp->output_filters = rp->proto_output_filters = mof; > } else { > ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "This request is not a sub %d",r->prev); > } > struct ap_filter_t *cur; > > cur = r->output_filters; > while ( cur ) { > ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Found filter: %s",cur->frec->name); > cur = cur->next; > } > > ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "nph-cgi bypassing filters.."); > > cur = r->connection->output_filters; > while (cur && cur->frec->ftype < AP_FTYPE_TRANSCODE ) { > cur = cur->next; > } > r->connection->output_filters = r->output_filters = r->proto_output_filters = cur; > > cur = r->output_filters; > while ( cur ) { > ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Remaining filter: %s",cur->frec->name); > cur = cur->next; > } > > rv = ap_pass_brigade(r->output_filters, bb); > } > > /* don't soak up script output if errors occurred writing it > * out... otherwise, we prolong the life of the script when the > * connection drops or we stopped sending output for some other > * reason */ > if (rv == APR_SUCCESS && !r->connection->aborted) { > apr_file_pipe_timeout_set(script_err, r->server->timeout); > log_script_err(r, script_err); > } > > apr_file_close(script_err); > 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; >} > >static apr_status_t include_cmd(include_ctx_t *ctx, ap_filter_t *f, > apr_bucket_brigade *bb, const char *command) >{ > cgi_exec_info_t e_info; > const char **argv; > apr_file_t *script_out = NULL, *script_in = NULL, *script_err = NULL; > apr_status_t rv; > request_rec *r = f->r; > > add_ssi_vars(r); > > e_info.process_cgi = 0; > e_info.cmd_type = APR_SHELLCMD; > e_info.detached = 0; > e_info.in_pipe = APR_NO_PIPE; > e_info.out_pipe = APR_FULL_BLOCK; > e_info.err_pipe = APR_NO_PIPE; > e_info.prog_type = RUN_AS_SSI; > e_info.bb = &bb; > e_info.ctx = ctx; > e_info.next = f->next; > e_info.addrspace = 0; > > if ((rv = cgi_build_command(&command, &argv, r, r->pool, > &e_info)) != APR_SUCCESS) { > ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, > "don't know how to spawn cmd child process: %s", > r->filename); > return rv; > } > > /* run the script in its own process */ > if ((rv = run_cgi_child(&script_out, &script_in, &script_err, > command, argv, r, r->pool, > &e_info)) != APR_SUCCESS) { > ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, > "couldn't spawn child process: %s", r->filename); > return rv; > } > > APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_pipe_create(script_in, > f->c->bucket_alloc)); > ctx->flush_now = 1; > > /* We can't close the pipe here, because we may return before the > * full CGI has been sent to the network. That's okay though, > * because we can rely on the pool to close the pipe for us. > */ > 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) { > cgi_pfn_gtv(ctx, &tag, &tag_val, SSI_VALUE_DECODED); > if (!tag || !tag_val) { > break; > } > > if (!strcmp(tag, "cmd")) { > apr_status_t rv; > > cgi_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; > > cgi_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 int cgi_post_config(apr_pool_t *p, apr_pool_t *plog, > apr_pool_t *ptemp, server_rec *s) >{ > cgi_pfn_reg_with_ssi = APR_RETRIEVE_OPTIONAL_FN(ap_register_include_handler); > cgi_pfn_gtv = APR_RETRIEVE_OPTIONAL_FN(ap_ssi_get_tag_and_value); > cgi_pfn_ps = APR_RETRIEVE_OPTIONAL_FN(ap_ssi_parse_string); > > if ((cgi_pfn_reg_with_ssi) && (cgi_pfn_gtv) && (cgi_pfn_ps)) { > /* Required by mod_include filter. This is how mod_cgi registers > * with mod_include to provide processing of the exec directive. > */ > cgi_pfn_reg_with_ssi("exec", handle_exec); > } > > /* This is the means by which unusual (non-unix) os's may find alternate > * means to run a given command (e.g. shebang/registry parsing on Win32) > */ > cgi_build_command = APR_RETRIEVE_OPTIONAL_FN(ap_cgi_build_command); > if (!cgi_build_command) { > cgi_build_command = default_build_command; > } > return OK; >} > >static void register_hooks(apr_pool_t *p) >{ > static const char * const aszPre[] = { "mod_include.c", NULL }; > ap_hook_handler(cgi_handler, NULL, NULL, APR_HOOK_MIDDLE); > ap_hook_post_config(cgi_post_config, aszPre, NULL, APR_HOOK_REALLY_FIRST); >} > >module AP_MODULE_DECLARE_DATA cgi_module = >{ > STANDARD20_MODULE_STUFF, > NULL, /* dir config creater */ > NULL, /* dir merger --- default is to override */ > create_cgi_config, /* server config */ > merge_cgi_config, /* merge server config */ > cgi_cmds, /* command apr_table_t */ > register_hooks /* register hooks */ >}; View Attachment As Raw

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