#define CORE_PRIVATE

#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 "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 "http_conf_globals.h"

#include "ap_mpm.h"

#include "unixd.h"

#include "mod_suexec.h"

#include "apr_optional.h"

#include "../filters/mod_include.h"

#include <sys/stat.h>

#ifdef HAVE_SYS_SOCKET_H

#include <sys/socket.h>

#endif

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif

#ifdef HAVE_STRINGS_H

#include <strings.h>

#endif

#include <sys/un.h> /* for sockaddr_un */

#include <sys/types.h>

module AP_MODULE_DECLARE_DATA cgid_module;

static void 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, apr_bucket_brigade **bb, request_rec *r,

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

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;

static int total_modules = 0;

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

#define DEFAULT_SOCKET "logs/cgisock"

#define SHELL_PATH "/bin/sh"

#define CGI_REQ 1

#define SSI_REQ 2

#ifndef DEFAULT_CGID_LISTENBACKLOG

#define DEFAULT_CGID_LISTENBACKLOG 100

#endif

typedef struct {

const char *sockname;

const char *logname;

long logbytes;

int bufbytes;

} cgid_server_conf;

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;

/* 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;

}

static void cgid_maint(int reason, void *data, apr_wait_t status)

{

#if APR_HAS_OTHER_CHILD

pid_t *sd = data;

switch (reason) {

case APR_OC_REASON_DEATH:

case APR_OC_REASON_LOST:

/* stop gap to make sure everything else works. In the end,

apr_destroy_pool(pcgi);

kill(getppid(), SIGWINCH);

break;

case APR_OC_REASON_RESTART:

case APR_OC_REASON_UNREGISTER:

apr_destroy_pool(pcgi);

kill(*sd, SIGHUP);

break;

}

#endif

}

static void get_req(int fd, request_rec *r, char **filename, char **argv0, char ***env, int *req_type)

{

int i, len, j;

unsigned char *data;

char **environ;

core_dir_config *temp_core;

void **dconf;

module *suexec_mod = ap_find_linked_module("mod_suexec.c");

r->server = apr_pcalloc(r->pool, sizeof(server_rec));

read(fd, req_type, sizeof(int));

read(fd, &j, sizeof(int));

read(fd, &len, sizeof(int));

data = apr_pcalloc(r->pool, len + 1); /* get a cleared byte for final '\0' */

i = read(fd, data, len);

r->filename = ap_getword(r->pool, (const char **)&data, '\n');

*argv0 = ap_getword(r->pool, (const char **)&data, '\n');

r->uri = ap_getword(r->pool, (const char **)&data, '\n');

environ = apr_pcalloc(r->pool, (j + 2) *sizeof(char *));

i = 0;

for (i = 0; i < j; i++) {

environ[i] = ap_getword(r->pool, (const char **)&data, '\n');

}

*env = environ;

r->args = ap_getword(r->pool, (const char **)&data, '\n');

read(fd, &i, sizeof(int));

/* add 1, so that if i == 0, we still malloc something. */

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[i] = (void *)temp_core;

if (suexec_mod) {

suexec_config_t *suexec_cfg = apr_pcalloc(r->pool, sizeof(*suexec_cfg));

read(fd, &i, sizeof(int));

read(fd, &suexec_cfg->ugid.uid, sizeof(uid_t));

read(fd, &suexec_cfg->ugid.gid, sizeof(gid_t));

read(fd, &suexec_cfg->active, sizeof(int));

dconf[i] = (void *)suexec_cfg;

}

r->per_dir_config = dconf;

#if 0

#ifdef RLIMIT_CPU

read(fd, &j, sizeof(int));

if (j) {

temp_core->limit_cpu = (struct rlimit *)apr_palloc (sizeof(struct rlimit));

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)

read(fd, &j, sizeof(int));

if (j) {

temp_core->limit_mem = (struct rlimit *)apr_palloc(r->pool, sizeof(struct rlimit));

read(fd, temp_core->limit_mem, sizeof(struct rlimit));

}

else {

temp_core->limit_mem = NULL;

}

#endif

#ifdef RLIMIT_NPROC

read(fd, &j, sizeof(int));

if (j) {

temp_core->limit_nproc = (struct rlimit *)apr_palloc(r->pool, sizeof(struct rlimit));

read(fd, temp_core->limit_nproc, sizeof(struct rlimit));

}

else {

temp_core->limit_nproc = NULL;

}

#endif

#endif

/* For right now, just make the notes table. At some point we will need

r->notes = apr_make_table(r->pool, 1);

}

static void send_req(int fd, request_rec *r, char *argv0, char **env, int req_type)

{

int len, r_type = req_type;

int i = 0;

char *data;

module *suexec_mod = ap_find_linked_module("mod_suexec.c");

data = apr_pstrcat(r->pool, r->filename, "\n", argv0, "\n", r->uri, "\n",

NULL);

for (i =0; env[i]; i++) {

continue;

}

/* Write the request type (SSI "exec cmd" or cgi). */

if (write(fd, &r_type, sizeof(int)) < 0) {

ap_log_rerror(APLOG_MARK, APLOG_ERR, errno, r,

"write to cgi daemon process");

}

/* Write the number of entries in the environment. */

if (write(fd, &i, sizeof(int)) < 0) {

ap_log_rerror(APLOG_MARK, APLOG_ERR, errno, r,

"write to cgi daemon process");

}

for (i = 0; env[i]; i++) {

data = apr_pstrcat(r->pool, data, env[i], "\n", NULL);

}

data = apr_pstrcat(r->pool, data, r->args, NULL);

len = strlen(data);

/* Write the length of the concatenated env string. */

if (write(fd, &len, sizeof(int)) < 0) {

ap_log_rerror(APLOG_MARK, APLOG_ERR, errno, r,

"write to cgi daemon process");

}

/* Write the concatted env string. */

if (write(fd, data, len) < 0) {

ap_log_rerror(APLOG_MARK, APLOG_ERR, errno, r,

"write to cgi daemon process");

}

/* Write module_index id value. */

if (write(fd, &core_module.module_index, sizeof(int)) < 0) {

ap_log_rerror(APLOG_MARK, APLOG_ERR, errno, r,

"write to cgi daemon process");

}

if (suexec_mod) {

suexec_config_t *suexec_cfg = ap_get_module_config(r->per_dir_config,

suexec_mod);

write(fd, &suexec_mod->module_index, sizeof(int));

write(fd, &suexec_cfg->ugid.uid, sizeof(uid_t));

write(fd, &suexec_cfg->ugid.gid, sizeof(gid_t));

write(fd, &suexec_cfg->active, sizeof(int));

}

#if 0

#ifdef RLIMIT_CPU

if (conf->limit_cpu) {

len = 1;

write(fd, &len, sizeof(int));

write(fd, conf->limit_cpu, sizeof(struct rlimit));

}

else {

len = 0;

write(fd, &len, sizeof(int));

}

#endif

#if defined(RLIMIT_DATA) || defined(RLIMIT_VMEM) || defined(RLIMIT_AS)

if (conf->limit_mem) {

len = 1;

write(fd, &len, sizeof(int));

write(fd, conf->limit_mem, sizeof(struct rlimit));

}

else {

len = 0;

write(fd, &len, sizeof(int));

}

#endif

#ifdef RLIMIT_NPROC

if (conf->limit_nproc) {

len = 1;

write(fd, &len, sizeof(int));

write(fd, conf->limit_nproc, sizeof(struct rlimit));

}

else {

len = 0;

write(fd, &len, sizeof(int));

}

#endif

#endif

}

static int cgid_server(void *data)

{

struct sockaddr_un unix_addr;

int sd, sd2, rc, req_type;

mode_t omask;

apr_socklen_t len;

server_rec *main_server = data;

cgid_server_conf *sconf = (cgid_server_conf *)ap_get_module_config(

main_server->module_config, &cgid_module);

apr_signal(SIGCHLD, SIG_IGN);

if (unlink(sconf->sockname) < 0 && errno != ENOENT) {

ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server,

"Couldn't unlink unix domain socket %s",

sconf->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, sconf->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",

sconf->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(sconf->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",

sconf->sockname);

return errno;

}

}

unixd_setup_child(); /* if running as root, switch to configured user/group */

while (1) {

int errfileno = STDERR_FILENO;

char *argv0;

char *filename;

char **env;

const char * const *argv;

apr_int32_t in_pipe = APR_CHILD_BLOCK;

apr_int32_t out_pipe = APR_CHILD_BLOCK;

apr_int32_t err_pipe = APR_CHILD_BLOCK;

apr_cmdtype_e cmd_type = APR_PROGRAM;

apr_pool_t *p;

request_rec *r;

apr_procattr_t *procattr = NULL;

apr_proc_t *procnew = NULL;

apr_file_t *inout;

len = sizeof(unix_addr);

sd2 = accept(sd, (struct sockaddr *)&unix_addr, &len);

if (sd2 < 0) {

if (errno != EINTR) {

ap_log_error(APLOG_MARK, APLOG_ERR, errno,

(server_rec *)data,

"Error accepting on cgid socket.");

}

continue;

}

apr_create_pool(&p, pcgi);

r = apr_pcalloc(p, sizeof(request_rec));

procnew = apr_pcalloc(p, sizeof(*procnew));

r->pool = p;

get_req(sd2, r, &filename, &argv0, &env, &req_type);

apr_put_os_file(&r->server->error_log, &errfileno, r->pool);

apr_put_os_file(&inout, &sd2, r->pool);

if (req_type == SSI_REQ) {

in_pipe = APR_NO_PIPE;

out_pipe = APR_FULL_BLOCK;

err_pipe = APR_NO_PIPE;

cmd_type = APR_SHELLCMD;

}

if (((rc = apr_createprocattr_init(&procattr, p)) != APR_SUCCESS) ||

((req_type == CGI_REQ) &&

(((rc = apr_setprocattr_io(procattr,

in_pipe,

out_pipe,

err_pipe)) != APR_SUCCESS) ||

((rc = apr_setprocattr_childerr(procattr, r->server->error_log, NULL)) != APR_SUCCESS) ||

((rc = apr_setprocattr_childin(procattr, inout, NULL)) != APR_SUCCESS))) ||

((rc = apr_setprocattr_childout(procattr, inout, NULL)) != APR_SUCCESS) ||

((rc = apr_setprocattr_dir(procattr,

ap_make_dirstr_parent(r->pool, r->filename))) != APR_SUCCESS) ||

((rc = apr_setprocattr_cmdtype(procattr, 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 {

argv = (const char * const *)create_argv(r->pool, NULL, NULL, NULL, argv0, r->args);

rc = ap_os_create_privileged_process(r, procnew, argv0, argv,

(const char * const *)env,

procattr, p);

close(sd2);

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);

}

}

}

return -1;

}

static void cgid_init(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp,

server_rec *main_server)

{

pid_t pid;

apr_proc_t *procnew;

void *data;

int first_time = 0;

const char *userdata_key = "cgid_init";

module **m;

apr_get_userdata(&data, userdata_key, main_server->process->pool);

if (!data) {

first_time = 1;

apr_set_userdata((const void *)1, userdata_key,

apr_null_cleanup, main_server->process->pool);

}

if (!first_time) {

apr_create_pool(&pcgi, p);

total_modules = 0;

for (m = ap_preloaded_modules; *m != NULL; m++)

total_modules++;

if ((pid = fork()) < 0) {

ap_log_error(APLOG_MARK, APLOG_ERR, errno, main_server,

"Couldn't spawn cgid daemon process");

}

else if (pid == 0) {

cgid_server(main_server);

exit(-1);

}

procnew = apr_pcalloc(p, sizeof(*procnew));

procnew->pid = pid;

procnew->err = procnew->in = procnew->out = NULL;

apr_note_subprocess(p, procnew, kill_after_timeout);

#if APR_HAS_OTHER_CHILD

apr_register_other_child(procnew, cgid_maint, &procnew->pid, NULL, p);

#endif

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

cgid_pfn_reg_with_ssi("exec", handle_exec);

}

}

}

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;

c->sockname = ap_server_root_relative(p, DEFAULT_SOCKET);

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 =

(cgid_server_conf *) ap_get_module_config(s->module_config, &cgid_module);

conf->logname = arg;

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 =

(cgid_server_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 =

(cgid_server_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)

{

server_rec *s = cmd->server;

cgid_server_conf *conf =

(cgid_server_conf *) ap_get_module_config(s->module_config, &cgid_module);

conf->sockname = ap_server_root_relative(cmd->pool, arg);

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_NOERRNO | APLOG_ERR;

ap_log_rerror(APLOG_MARK, log_flags, rv, r,

"%s: %s", error, r->filename);

if (!conf->logname ||

((stat(ap_server_root_relative(r->pool, conf->logname), &finfo) == 0)

&& (finfo.st_size > conf->logbytes)) ||

(apr_open(&f, ap_server_root_relative(r->pool, 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_now());

apr_fprintf(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_fprintf(f, "%%%% %d %s\n", ret, r->filename);

apr_fprintf(f, "%%error\n%s\n", error);

apr_close(f);

return ret;

}

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

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

{

apr_array_header_t *hdrs_arr = apr_table_elts(r->headers_in);

apr_table_entry_t *hdrs = (apr_table_entry_t *) hdrs_arr->elts;

char argsbuffer[HUGE_STRING_LEN];

apr_file_t *f = NULL;

int i;

struct stat finfo;

char time_str[APR_CTIME_LEN];

if (!conf->logname ||

((stat(ap_server_root_relative(r->pool, conf->logname), &finfo) == 0)

&& (finfo.st_size > conf->logbytes)) ||

(apr_open(&f, ap_server_root_relative(r->pool, conf->logname),

APR_APPEND|APR_WRITE|APR_CREATE, APR_OS_DEFAULT, r->pool) != APR_SUCCESS)) {

/* Soak up script output */

while (apr_fgets(argsbuffer, HUGE_STRING_LEN, script_in) == 0)

continue;

if (script_err) {

while (apr_fgets(argsbuffer, HUGE_STRING_LEN, script_err) == 0)

continue;

}

return ret;

}

/* "%% [Wed Jun 19 10:53:21 1996] GET /cgid-bin/printenv HTTP/1.0" */

apr_ctime(time_str, apr_now());

apr_fprintf(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_fprintf(f, "%%%% %d %s\n", ret, r->filename);

apr_puts("%request\n", f);

for (i = 0; i < hdrs_arr->nelts; ++i) {

if (!hdrs[i].key)

continue;

apr_fprintf(f, "%s: %s\n", hdrs[i].key, hdrs[i].val);

}

if ((r->method_number == M_POST || r->method_number == M_PUT)

&& *dbuf) {

apr_fprintf(f, "\n%s\n", dbuf);

}

apr_puts("%response\n", f);

hdrs_arr = apr_table_elts(r->err_headers_out);

hdrs = (apr_table_entry_t *) hdrs_arr->elts;

for (i = 0; i < hdrs_arr->nelts; ++i) {

if (!hdrs[i].key)

continue;

apr_fprintf(f, "%s: %s\n", hdrs[i].key, hdrs[i].val);

}

if (sbuf && *sbuf)

apr_fprintf(f, "%s\n", sbuf);

if (apr_fgets(argsbuffer, HUGE_STRING_LEN, script_in) == 0) {

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

apr_puts(argsbuffer, f);

while (apr_fgets(argsbuffer, HUGE_STRING_LEN, script_in) == 0)

apr_puts(argsbuffer, f);

apr_puts("\n", f);

}

if (script_err) {

if (apr_fgets(argsbuffer, HUGE_STRING_LEN, script_err) == 0) {

apr_puts("%stderr\n", f);

apr_puts(argsbuffer, f);

while (apr_fgets(argsbuffer, HUGE_STRING_LEN, script_err) == 0)

apr_puts(argsbuffer, f);

apr_puts("\n", f);

}

}

apr_close(script_in);

if (script_err) {

apr_close(script_err);

}

apr_close(f);

return ret;

}

static int cgid_handler(request_rec *r)

{

int retval, nph, dbpos = 0;

char *argv0, *dbuf = NULL;

apr_bucket_brigade *bb;

apr_bucket *b;

char argsbuffer[HUGE_STRING_LEN];

void *sconf;

cgid_server_conf *conf;

int is_included;

int sd;

char **env;

struct sockaddr_un unix_addr;

apr_file_t *tempsock;

apr_size_t nbytes;

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 |= (1 << M_GET);

r->allowed |= (1 << M_POST);

return DECLINED;

}

sconf = r->server->module_config;

conf = (cgid_server_conf *) ap_get_module_config(sconf, &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");

ap_add_common_vars(r);

ap_add_cgi_vars(r);

env = ap_create_environment(r->pool, r->subprocess_env);

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");

}

memset(&unix_addr, 0, sizeof(unix_addr));

unix_addr.sun_family = AF_UNIX;

strcpy(unix_addr.sun_path, conf->sockname);

if (connect(sd, (struct sockaddr *)&unix_addr, sizeof(unix_addr)) < 0) {

return log_scripterror(r, conf, HTTP_INTERNAL_SERVER_ERROR, errno,

"unable to connect to cgi daemon");

}

send_req(sd, r, argv0, env, CGI_REQ);

/* We are putting the tempsock variable into a file so that we can use

apr_put_os_file(&tempsock, &sd, r->pool);

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

return retval;

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

argv0++;

else

argv0 = r->filename;

/* Transfer any put/post args, CERN style...

if (ap_should_client_block(r)) {

int dbsize, len_read;

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;

}

nbytes = len_read;

apr_write(tempsock, argsbuffer, &nbytes);

if (nbytes < len_read) {

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

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

/* dump it */

}

break;

}

}

shutdown(sd, 1); /* done writing; force EOF on child's stdin */

}

/* Handle script return... */

if (!nph) {

const char *location;

char sbuf[MAX_STRING_LEN];

int ret;

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

return log_script(r, conf, ret, dbuf, sbuf, tempsock, NULL);

}

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

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

/* Soak up all the script output */

while (apr_fgets(argsbuffer, HUGE_STRING_LEN, tempsock) > 0) {

continue;

}

/* 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;

}

ap_send_http_header(r);

if (!r->header_only) {

bb = apr_brigade_create(r->pool);

b = apr_bucket_create_pipe(tempsock);

APR_BRIGADE_INSERT_TAIL(bb, b);

b = apr_bucket_create_eos();

APR_BRIGADE_INSERT_TAIL(bb, b);

ap_pass_brigade(r->output_filters, bb);

}

}

if (nph) {

bb = apr_brigade_create(r->pool);

b = apr_bucket_create_pipe(tempsock);

APR_BRIGADE_INSERT_TAIL(bb, b);

b = apr_bucket_create_eos();

APR_BRIGADE_INSERT_TAIL(bb, b);

ap_pass_brigade(r->output_filters, bb);

}

apr_close(tempsock);

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) {

return -1;

}

/* No hardwired path info or query allowed */

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

return -1;

}

if (rr->finfo.protection == 0) {

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

rr->content_type = CGI_MAGIC_TYPE;

/* Run it. */

rr_status = ap_run_sub_req(rr);

if (ap_is_HTTP_REDIRECT(rr_status)) {

apr_size_t len_loc, h_wrt;

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

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

len_loc = strlen(location);

tmp_buck = apr_bucket_create_immortal("<A HREF=\"", sizeof("<A HREF=\""));

APR_BUCKET_INSERT_BEFORE(head_ptr, tmp_buck);

tmp2_buck = apr_bucket_create_heap(location, len_loc, 1, &h_wrt);

APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);

tmp2_buck = apr_bucket_create_immortal("\">", sizeof("\">"));

APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);

tmp2_buck = apr_bucket_create_heap(location, len_loc, 1, &h_wrt);

APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);

tmp2_buck = apr_bucket_create_immortal("</A>", sizeof("</A>"));

APR_BUCKET_INSERT_BEFORE(head_ptr, tmp2_buck);

if (*inserted_head == NULL) {

*inserted_head = tmp_buck;

}

}

ap_destroy_sub_req(rr);

return 0;

}

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));

}

}

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, apr_bucket_brigade **bb, char *command,

request_rec *r, ap_filter_t *f)

{

char **env;

const char *location;

int sd;

int retval;

apr_bucket_brigade *bcgi;

apr_bucket *b;

struct sockaddr_un unix_addr;

apr_file_t *tempsock = NULL;

void *sconf = r->server->module_config;

cgid_server_conf *conf = (cgid_server_conf *) ap_get_module_config(sconf, &cgid_module);

add_ssi_vars(r, f->next);

env = ap_create_environment(r->pool, r->subprocess_env);

if ((sd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {

return log_scripterror(r, conf, HTTP_INTERNAL_SERVER_ERROR, 0,

"unable to create socket to cgi daemon");

}

memset(&unix_addr, 0, sizeof(unix_addr));

unix_addr.sun_family = AF_UNIX;

strcpy(unix_addr.sun_path, conf->sockname);

if (connect(sd, (struct sockaddr *)&unix_addr, sizeof(unix_addr)) < 0) {

return log_scripterror(r, conf, HTTP_INTERNAL_SERVER_ERROR, 0,

"unable to connect to cgi daemon");

}

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

send_req(sd, r, command, env, SSI_REQ);

/* We are putting the tempsock variable into a file so that we can use

apr_put_os_file(&tempsock, &sd, r->pool);

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

return retval;

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

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

char argsbuffer[HUGE_STRING_LEN];

/* Soak up all the script output */

while (apr_fgets(argsbuffer, HUGE_STRING_LEN, tempsock) > 0) {

continue;

}

/* 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;

}

ap_send_http_header(r);

if (!r->header_only) {

bcgi = apr_brigade_create(r->pool);

b = apr_bucket_create_pipe(tempsock);

APR_BRIGADE_INSERT_TAIL(bcgi, b);

ap_pass_brigade(f->next, bcgi);

}

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) {

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

if (tag_val == NULL) {

if (tag == NULL) {

return (0);

}

else {

return 1;

}

}

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

cgid_pfn_ps(r, 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);

}

/* just in case some stooge changed directories */

}

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

cgid_pfn_ps(r, tag_val, parsed_string, sizeof(parsed_string), 0);

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

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 void register_hook(apr_pool_t *p)

{

ap_hook_post_config(cgid_init, NULL, 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 */

};