#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"

#define APR_WANT_STRFUNC

#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 "../filters/mod_include.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;

typedef enum {RUN_AS_SSI, RUN_AS_CGI} prog_types;

typedef struct {

apr_int32_t in_pipe;

apr_int32_t out_pipe;

apr_int32_t err_pipe;

apr_cmdtype_e cmd_type;

prog_types prog_type;

apr_bucket_brigade **bb;

include_ctx_t *ctx;

ap_filter_t *next;

} exec_info;

static int is_scriptaliased(request_rec *r)

{

const char *t = apr_table_get(r->notes, "alias-forced-type");

return t && (!strcasecmp(t, "cgi-script"));

}

#define DEFAULT_LOGBYTES 10385760

#define DEFAULT_BUFBYTES 1024

typedef struct {

const char *logname;

long logbytes;

int 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_NOERRNO | 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;

}

static void log_script_err(request_rec *r, apr_file_t *script_err)

{

char argsbuffer[HUGE_STRING_LEN];

char *newline;

while (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 | APLOG_NOERRNO, 0, r,

"%s", argsbuffer);

}

}

static int log_script(request_rec *r, cgi_server_conf * conf, int ret,

char *dbuf, const char *sbuf, apr_file_t *script_in,

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;

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 */

while (apr_file_gets(argsbuffer, HUGE_STRING_LEN,

script_in) == APR_SUCCESS)

continue;

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);

if (apr_file_gets(argsbuffer, HUGE_STRING_LEN, script_in) == APR_SUCCESS) {

apr_file_puts("%stdout\n", f);

apr_file_puts(argsbuffer, f);

while (apr_file_gets(argsbuffer, HUGE_STRING_LEN,

script_in) == APR_SUCCESS)

apr_file_puts(argsbuffer, f);

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_file_close(script_in);

apr_file_close(script_err);

apr_file_close(f);

return ret;

}

static void add_ssi_vars(request_rec *r, ap_filter_t *next)

{

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, next);

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 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,

exec_info *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

if (e_info->prog_type == RUN_AS_CGI) {

ap_add_cgi_vars(r);

}

else /* SSIs want a controlled environment and a special path. */

{

add_ssi_vars(r, e_info->next);

}

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.

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)) {

/* 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));

if (e_info->prog_type == RUN_AS_SSI) {

SPLIT_AND_PASS_PRETAG_BUCKETS(*(e_info->bb), e_info->ctx, e_info->next, rc);

if (rc != APR_SUCCESS) {

return rc;

}

}

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, rc, r,

"couldn't create child process: %d: %s", rc, 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, (int)(r->server->timeout * APR_USEC_PER_SEC));

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, (int)(r->server->timeout * APR_USEC_PER_SEC));

*script_err = procnew->err;

if (!*script_err)

return APR_EBADF;

apr_file_pipe_timeout_set(*script_err, (int)(r->server->timeout * APR_USEC_PER_SEC));

}

}

}

#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,

int replace_cmd)

{

int numwords, x, idx;

char *w;

const char *args = r->args;

const char *argv0;

if (replace_cmd) {

/* Allow suexec's "/" check to succeed */

if ((argv0 = strrchr(r->filename, '/')) != NULL)

argv0++;

else

argv0 = r->filename;

*cmd = argv0;

}

if (!args || !args[0] || ap_strchr_c(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

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 int cgi_handler(request_rec *r)

{

int retval, nph, 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;

char argsbuffer[HUGE_STRING_LEN];

int is_included;

apr_pool_t *p;

cgi_server_conf *conf;

apr_status_t rv;

exec_info e_info;

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;

if (r->method_number == M_OPTIONS) {

/* 99 out of 100 CGI scripts, this is all they support */

r->allowed |= (AP_METHOD_BIT << M_GET);

r->allowed |= (AP_METHOD_BIT << M_POST);

return DECLINED;

}

argv0 = apr_filename_of_pathname(r->filename);

nph = !(strncmp(argv0, "nph-", 4));

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->path_info && *r->path_info && !r->used_path_info) {

return log_scripterror(r, conf, HTTP_NOT_FOUND, 0,

"AcceptPathInfo off disallows user's path");

}

if ((retval = ap_setup_client_block(r, REQUEST_CHUNKED_ERROR)))

return retval;

ap_add_common_vars(r);

/* build the command line */

if ((rv = cgi_build_command(&command, &argv, r, p, 1)) != 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;

}

e_info.cmd_type = APR_PROGRAM;

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;

/* 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...

if (ap_should_client_block(r)) {

int len_read, dbsize;

apr_size_t bytes_written, bytes_to_write;

apr_status_t rv;

if (conf->logname) {

dbuf = apr_pcalloc(r->pool, conf->bufbytes + 1);

dbpos = 0;

}

while ((len_read =

ap_get_client_block(r, argsbuffer, HUGE_STRING_LEN)) > 0) {

if (conf->logname) {

if ((dbpos + len_read) > conf->bufbytes) {

dbsize = conf->bufbytes - dbpos;

}

else {

dbsize = len_read;

}

memcpy(dbuf + dbpos, argsbuffer, dbsize);

dbpos += dbsize;

}

/* Keep writing data to the child until done or too much time

bytes_written = 0;

do {

bytes_to_write = len_read - bytes_written;

rv = apr_file_write(script_out, argsbuffer + bytes_written,

&bytes_to_write);

bytes_written += bytes_to_write;

} while (rv == APR_SUCCESS

&& bytes_written < (apr_size_t)len_read);

if (rv != APR_SUCCESS || bytes_written < (apr_size_t)len_read) {

/* silly script stopped reading, soak up remaining message */

while (ap_get_client_block(r, argsbuffer, HUGE_STRING_LEN) > 0) {

/* dump it */

}

break;

}

}

apr_file_flush(script_out);

}

apr_file_close(script_out);

/* Handle script return... */

if (script_in && !nph) {

const char *location;

char sbuf[MAX_STRING_LEN];

int ret;

if ((ret = ap_scan_script_header_err(r, script_in, sbuf))) {

return log_script(r, conf, ret, dbuf, sbuf, script_in, script_err);

}

location = apr_table_get(r->headers_out, "Location");

if (location && location[0] == '/' && r->status == 200) {

/* Soak up all the script output */

while (apr_file_gets(argsbuffer, HUGE_STRING_LEN,

script_in) == APR_SUCCESS) {

continue;

}

log_script_err(r, script_err);

/* This redirect needs to be a GET no matter what the original

r->method = apr_pstrdup(r->pool, "GET");

r->method_number = M_GET;

/* We already read the message body (if any), so don't allow

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

return HTTP_MOVED_TEMPORARILY;

}

if (!r->header_only) {

bb = apr_brigade_create(r->pool);

b = apr_bucket_pipe_create(script_in);

APR_BRIGADE_INSERT_TAIL(bb, b);

b = apr_bucket_eos_create();

APR_BRIGADE_INSERT_TAIL(bb, b);

ap_pass_brigade(r->output_filters, bb);

}

log_script_err(r, script_err);

apr_file_close(script_err);

}

if (script_in && nph) {

struct ap_filter_t *cur;

/* get rid of all filters up through protocol... since we

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);

b = apr_bucket_pipe_create(script_in);

APR_BRIGADE_INSERT_TAIL(bb, b);

b = apr_bucket_eos_create();

APR_BRIGADE_INSERT_TAIL(bb, b);

ap_pass_brigade(r->output_filters, bb);

}

return OK; /* NOT r->status, even if it has changed. */

}

static int include_cgi(char *s, request_rec *r, ap_filter_t *next,

apr_bucket *head_ptr, apr_bucket **inserted_head)

{

request_rec *rr = ap_sub_req_lookup_uri(s, r, next);

int rr_status;

apr_bucket *tmp_buck, *tmp2_buck;

if (rr->status != HTTP_OK) {

ap_destroy_sub_req(rr);

return -1;

}

/* No hardwired path info or query allowed */

if ((rr->path_info && rr->path_info[0]) || rr->args) {

ap_destroy_sub_req(rr);

return -1;

}

if (rr->finfo.filetype != APR_REG) {

ap_destroy_sub_req(rr);

return -1;

}

/* 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

ap_set_content_type(rr, CGI_MAGIC_TYPE);

/* Run it. */

rr_status = ap_run_sub_req(rr);

if (ap_is_HTTP_REDIRECT(rr_status)) {

apr_size_t len_loc;

const char *location = apr_table_get(rr->headers_out, "Location");

location = ap_escape_html(rr->pool, location);

len_loc = strlen(location);

/* XXX: if most of this stuff is going to get copied anyway,

tmp_buck = apr_bucket_immortal_create("<A HREF=\"",

sizeof("<A HREF=\"") - 1);

APR_BUCKET_INSERT_BEFORE(head_ptr, tmp_buck);

tmp2_buck = apr_bucket_heap_create(location, len_loc, 1);

APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);

tmp2_buck = apr_bucket_immortal_create("\">", sizeof("\">") - 1);

APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);

tmp2_buck = apr_bucket_heap_create(location, len_loc, 1);

APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);

tmp2_buck = apr_bucket_immortal_create("</A>", sizeof("</A>") - 1);

APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);

if (*inserted_head == NULL) {

*inserted_head = tmp_buck;

}

}

ap_destroy_sub_req(rr);

return 0;

}

static int include_cmd(include_ctx_t *ctx, apr_bucket_brigade **bb,

const char *command, request_rec *r, ap_filter_t *f)

{

exec_info e_info;

const char **argv;

apr_file_t *script_out = NULL, *script_in = NULL, *script_err = NULL;

apr_bucket_brigade *bcgi;

apr_bucket *b;

apr_status_t rv;

if ((rv = cgi_build_command(&command, &argv, r, r->pool, 0)) != APR_SUCCESS) {

ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,

"don't know how to spawn cmd child process: %s",

r->filename);

return HTTP_INTERNAL_SERVER_ERROR;

}

e_info.cmd_type = APR_SHELLCMD;

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;

/* 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 HTTP_INTERNAL_SERVER_ERROR;

}

bcgi = apr_brigade_create(r->pool);

b = apr_bucket_pipe_create(script_in);

APR_BRIGADE_INSERT_TAIL(bcgi, b);

ap_pass_brigade(f->next, bcgi);

/* We can't close the pipe here, because we may return before the

return 0;

}

static int handle_exec(include_ctx_t *ctx, apr_bucket_brigade **bb, request_rec *r,

ap_filter_t *f, apr_bucket *head_ptr, apr_bucket **inserted_head)

{

char *tag = NULL;

char *tag_val = NULL;

char *file = r->filename;

apr_bucket *tmp_buck;

char parsed_string[MAX_STRING_LEN];

*inserted_head = NULL;

if (ctx->flags & FLAG_PRINTING) {

if (ctx->flags & FLAG_NO_EXEC) {

ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,

"exec used but not allowed in %s", r->filename);

CREATE_ERROR_BUCKET(ctx, tmp_buck, head_ptr, *inserted_head);

}

else {

while (1) {

cgi_pfn_gtv(ctx, &tag, &tag_val, 1);

if (tag_val == NULL) {

if (tag == NULL) {

return (0);

}

else {

return 1;

}

}

if (!strcmp(tag, "cmd")) {

cgi_pfn_ps(r, ctx, tag_val, parsed_string, sizeof(parsed_string), 1);

if (include_cmd(ctx, bb, parsed_string, r, f) == -1) {

ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,

"execution failure for parameter \"%s\" "

"to tag exec in file %s", tag, r->filename);

CREATE_ERROR_BUCKET(ctx, tmp_buck, head_ptr, *inserted_head);

}

}

else if (!strcmp(tag, "cgi")) {

apr_status_t retval = APR_SUCCESS;

cgi_pfn_ps(r, ctx, tag_val, parsed_string, sizeof(parsed_string), 0);

SPLIT_AND_PASS_PRETAG_BUCKETS(*bb, ctx, f->next, retval);

if (retval != APR_SUCCESS) {

return retval;

}

if (include_cgi(parsed_string, r, f->next, head_ptr, inserted_head) == -1) {

ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,

"invalid CGI ref \"%s\" in %s", tag_val, file);

CREATE_ERROR_BUCKET(ctx, tmp_buck, head_ptr, *inserted_head);

}

}

else {

ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, 0, r,

"unknown parameter \"%s\" to tag exec in %s", tag, file);

CREATE_ERROR_BUCKET(ctx, tmp_buck, head_ptr, *inserted_head);

}

}

}

}

return 0;

}

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

cgi_pfn_reg_with_ssi("exec", handle_exec);

}

/* This is the means by which unusual (non-unix) os's may find alternate

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 */

};