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httpd/httpd-2.4.37-r1828172+.patch

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mod_cgid: use fd passing to fix script stderr handling (#1591157) Resolves: rhbz#1591157
2019-07-17 10:31:15 +00:00
# ./pullrev.sh 1828172 1862968 1863191
http://svn.apache.org/viewvc?view=revision&revision=1828172
http://svn.apache.org/viewvc?view=revision&revision=1862968
http://svn.apache.org/viewvc?view=revision&revision=1863191
--- httpd-2.4.37/modules/generators/mod_cgi.c
+++ httpd-2.4.37/modules/generators/mod_cgi.c
@@ -92,6 +92,10 @@
apr_size_t bufbytes;
} cgi_server_conf;
+typedef struct {
+ apr_interval_time_t timeout;
+} cgi_dirconf;
+
static void *create_cgi_config(apr_pool_t *p, server_rec *s)
{
cgi_server_conf *c =
@@ -112,6 +116,12 @@
return overrides->logname ? overrides : base;
}
+static void *create_cgi_dirconf(apr_pool_t *p, char *dummy)
+{
+ cgi_dirconf *c = (cgi_dirconf *) apr_pcalloc(p, sizeof(cgi_dirconf));
+ return c;
+}
+
static const char *set_scriptlog(cmd_parms *cmd, void *dummy, const char *arg)
{
server_rec *s = cmd->server;
@@ -150,6 +160,17 @@
return NULL;
}
+static const char *set_script_timeout(cmd_parms *cmd, void *dummy, const char *arg)
+{
+ cgi_dirconf *dc = dummy;
+
+ if (ap_timeout_parameter_parse(arg, &dc->timeout, "s") != APR_SUCCESS) {
+ return "CGIScriptTimeout has wrong format";
+ }
+
+ return NULL;
+}
+
static const command_rec cgi_cmds[] =
{
AP_INIT_TAKE1("ScriptLog", set_scriptlog, NULL, RSRC_CONF,
@@ -158,6 +179,9 @@
"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("CGIScriptTimeout", set_script_timeout, NULL, RSRC_CONF | ACCESS_CONF,
+ "The amount of time to wait between successful reads from "
+ "the CGI script, in seconds."),
{NULL}
};
@@ -471,23 +495,26 @@
apr_filepath_name_get(r->filename));
}
else {
+ cgi_dirconf *dc = ap_get_module_config(r->per_dir_config, &cgi_module);
+ apr_interval_time_t timeout = dc->timeout > 0 ? dc->timeout : r->server->timeout;
+
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);
+ apr_file_pipe_timeout_set(*script_in, 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);
+ apr_file_pipe_timeout_set(*script_out, timeout);
*script_err = procnew->err;
if (!*script_err)
return APR_EBADF;
- apr_file_pipe_timeout_set(*script_err, r->server->timeout);
+ apr_file_pipe_timeout_set(*script_err, timeout);
}
}
}
@@ -563,189 +590,7 @@
}
#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);
- if (rv != APR_SUCCESS) {
- ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01217)
- "apr_pollset_create(); check system or user limits");
- return NULL;
- }
-
- 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);
- if (rv != APR_SUCCESS) {
- ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01218)
- "apr_pollset_add(); check system or user limits");
- return NULL;
- }
-
- fd.desc.f = err; /* script's stderr */
- fd.client_data = (void *)2;
- rv = apr_pollset_add(data->pollset, &fd);
- if (rv != APR_SUCCESS) {
- ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01219)
- "apr_pollset_add(); check system or user limits");
- return NULL;
- }
-
- 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, APLOGNO(01220)
- "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, APLOGNO(01221)
- "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
-};
-
+#include "cgi_common.h"
#endif
static int cgi_handler(request_rec *r)
@@ -766,6 +611,8 @@
apr_status_t rv;
cgi_exec_info_t e_info;
conn_rec *c;
+ cgi_dirconf *dc = ap_get_module_config(r->per_dir_config, &cgi_module);
+ apr_interval_time_t timeout = dc->timeout > 0 ? dc->timeout : r->server->timeout;
if (strcmp(r->handler, CGI_MAGIC_TYPE) && strcmp(r->handler, "cgi-script")) {
return DECLINED;
@@ -928,7 +775,7 @@
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);
+ b = cgi_bucket_create(r, dc->timeout, script_in, script_err, c->bucket_alloc);
if (b == NULL)
return HTTP_INTERNAL_SERVER_ERROR;
#else
@@ -985,7 +832,7 @@
* stderr output, as normal. */
discard_script_output(bb);
apr_brigade_destroy(bb);
- apr_file_pipe_timeout_set(script_err, r->server->timeout);
+ apr_file_pipe_timeout_set(script_err, timeout);
log_script_err(r, script_err);
}
@@ -1036,7 +883,7 @@
* 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);
+ apr_file_pipe_timeout_set(script_err, timeout);
log_script_err(r, script_err);
}
@@ -1277,7 +1124,7 @@
AP_DECLARE_MODULE(cgi) =
{
STANDARD20_MODULE_STUFF,
- NULL, /* dir config creater */
+ create_cgi_dirconf, /* dir config creater */
NULL, /* dir merger --- default is to override */
create_cgi_config, /* server config */
merge_cgi_config, /* merge server config */
--- httpd-2.4.37/modules/generators/mod_cgid.c
+++ httpd-2.4.37/modules/generators/mod_cgid.c
@@ -342,15 +342,19 @@
return close(fd);
}
-/* 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)
+/* Read from the socket dealing with incomplete messages and signals.
+ * Returns 0 on success or errno on failure. Stderr fd passed as
+ * auxiliary data from other end is written to *errfd, or else stderr
+ * fileno if not present. */
+static apr_status_t sock_readhdr(int fd, int *errfd, void *vbuf, size_t buf_size)
{
- char *buf = vbuf;
int rc;
+#ifndef HAVE_CGID_FDPASSING
+ char *buf = vbuf;
size_t bytes_read = 0;
+ if (errfd) *errfd = 0;
+
do {
do {
rc = read(fd, buf + bytes_read, buf_size - bytes_read);
@@ -365,9 +369,52 @@
}
} while (bytes_read < buf_size);
+
+#else /* with FD passing */
+ struct msghdr msg = {0};
+ struct iovec vec = {vbuf, buf_size};
+ struct cmsghdr *cmsg;
+ union { /* union to ensure alignment */
+ struct cmsghdr cm;
+ char buf[CMSG_SPACE(sizeof(int))];
+ } u;
+
+ msg.msg_iov = &vec;
+ msg.msg_iovlen = 1;
+
+ msg.msg_control = u.buf;
+ msg.msg_controllen = sizeof(u.buf);
+
+ if (errfd) *errfd = 0;
+
+ /* use MSG_WAITALL to skip loop on truncated reads */
+ do {
+ rc = recvmsg(fd, &msg, MSG_WAITALL);
+ } while (rc < 0 && errno == EINTR);
+
+ if (rc == 0) {
+ return ECONNRESET;
+ }
+
+ cmsg = CMSG_FIRSTHDR(&msg);
+ if (errfd
+ && cmsg
+ && cmsg->cmsg_len == CMSG_LEN(sizeof(*errfd))
+ && cmsg->cmsg_level == SOL_SOCKET
+ && cmsg->cmsg_type == SCM_RIGHTS) {
+ *errfd = *((int *) CMSG_DATA(cmsg));
+ }
+#endif
+
return APR_SUCCESS;
}
+/* As sock_readhdr but without auxiliary fd passing. */
+static apr_status_t sock_read(int fd, void *vbuf, size_t buf_size)
+{
+ return sock_readhdr(fd, NULL, vbuf, buf_size);
+}
+
/* deal with signals
*/
static apr_status_t sock_write(int fd, const void *buf, size_t buf_size)
@@ -384,7 +431,7 @@
return APR_SUCCESS;
}
-static apr_status_t sock_writev(int fd, request_rec *r, int count, ...)
+static apr_status_t sock_writev(int fd, int auxfd, request_rec *r, int count, ...)
{
va_list ap;
int rc;
@@ -399,9 +446,39 @@
}
va_end(ap);
+#ifndef HAVE_CGID_FDPASSING
do {
rc = writev(fd, vec, count);
} while (rc < 0 && errno == EINTR);
+#else
+ {
+ struct msghdr msg = { 0 };
+ struct cmsghdr *cmsg;
+ union { /* union for alignment */
+ char buf[CMSG_SPACE(sizeof(int))];
+ struct cmsghdr align;
+ } u;
+
+ msg.msg_iov = vec;
+ msg.msg_iovlen = count;
+
+ if (auxfd) {
+ msg.msg_control = u.buf;
+ msg.msg_controllen = sizeof(u.buf);
+
+ cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_SOCKET;
+ cmsg->cmsg_type = SCM_RIGHTS;
+ cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+ *((int *) CMSG_DATA(cmsg)) = auxfd;
+ }
+
+ do {
+ rc = sendmsg(fd, &msg, 0);
+ } while (rc < 0 && errno == EINTR);
+ }
+#endif
+
if (rc < 0) {
return errno;
}
@@ -410,7 +487,7 @@
}
static apr_status_t get_req(int fd, request_rec *r, char **argv0, char ***env,
- cgid_req_t *req)
+ int *errfd, cgid_req_t *req)
{
int i;
char **environ;
@@ -421,7 +498,7 @@
r->server = apr_pcalloc(r->pool, sizeof(server_rec));
/* read the request header */
- stat = sock_read(fd, req, sizeof(*req));
+ stat = sock_readhdr(fd, errfd, req, sizeof(*req));
if (stat != APR_SUCCESS) {
return stat;
}
@@ -479,14 +556,15 @@
return APR_SUCCESS;
}
-static apr_status_t send_req(int fd, request_rec *r, char *argv0, char **env,
- int req_type)
+static apr_status_t send_req(int fd, apr_file_t *errpipe, request_rec *r,
+ char *argv0, char **env, int req_type)
{
int i;
cgid_req_t req = {0};
apr_status_t stat;
ap_unix_identity_t * ugid = ap_run_get_suexec_identity(r);
core_dir_config *core_conf = ap_get_core_module_config(r->per_dir_config);
+ int errfd;
if (ugid == NULL) {
@@ -507,16 +585,21 @@
req.args_len = r->args ? strlen(r->args) : 0;
req.loglevel = r->server->log.level;
+ if (errpipe)
+ apr_os_file_get(&errfd, errpipe);
+ else
+ errfd = 0;
+
/* Write the request header */
if (req.args_len) {
- stat = sock_writev(fd, r, 5,
+ stat = sock_writev(fd, errfd, r, 5,
&req, sizeof(req),
r->filename, req.filename_len,
argv0, req.argv0_len,
r->uri, req.uri_len,
r->args, req.args_len);
} else {
- stat = sock_writev(fd, r, 4,
+ stat = sock_writev(fd, errfd, r, 4,
&req, sizeof(req),
r->filename, req.filename_len,
argv0, req.argv0_len,
@@ -531,7 +614,7 @@
for (i = 0; i < req.env_count; i++) {
apr_size_t curlen = strlen(env[i]);
- if ((stat = sock_writev(fd, r, 2, &curlen, sizeof(curlen),
+ if ((stat = sock_writev(fd, 0, r, 2, &curlen, sizeof(curlen),
env[i], curlen)) != APR_SUCCESS) {
return stat;
}
@@ -582,20 +665,34 @@
}
}
+/* Callback executed in the forked child process if exec of the CGI
+ * script fails. For the fd-passing case, output to stderr goes to
+ * the client (request handling thread) and is logged via
+ * ap_log_rerror there. For the non-fd-passing case, the "fake"
+ * request_rec passed via userdata is used to log. */
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, APLOGNO(01241) "%s", description);
+ if (vr) {
+ request_rec *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, APLOGNO(01241) "%s", description);
+ }
+ else {
+ const char *logstr;
+
+ logstr = apr_psprintf(pool, APLOGNO(01241) "error spawning CGI child: %s (%pm)\n",
+ description, &err);
+ fputs(logstr, stderr);
+ fflush(stderr);
+ }
}
static int cgid_server(void *data)
@@ -669,7 +766,7 @@
}
while (!daemon_should_exit) {
- int errfileno = STDERR_FILENO;
+ int errfileno;
char *argv0 = NULL;
char **env = NULL;
const char * const *argv;
@@ -709,7 +806,7 @@
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);
+ stat = get_req(sd2, r, &argv0, &env, &errfileno, &cgid_req);
if (stat != APR_SUCCESS) {
ap_log_error(APLOG_MARK, APLOG_ERR, stat,
main_server, APLOGNO(01248)
@@ -741,6 +838,16 @@
continue;
}
+ if (errfileno == 0) {
+ errfileno = STDERR_FILENO;
+ }
+ else {
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, rv, main_server,
+ "using passed fd %d as stderr", errfileno);
+ /* Limit the received fd lifetime to pool lifetime */
+ apr_pool_cleanup_register(ptrans, (void *)((long)errfileno),
+ close_unix_socket, close_unix_socket);
+ }
apr_os_file_put(&r->server->error_log, &errfileno, 0, r->pool);
apr_os_file_put(&inout, &sd2, 0, r->pool);
@@ -800,7 +907,10 @@
close(sd2);
}
else {
- apr_pool_userdata_set(r, ERRFN_USERDATA_KEY, apr_pool_cleanup_null, ptrans);
+ if (errfileno == STDERR_FILENO) {
+ /* Used by cgid_child_errfn without fd-passing. */
+ 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);
@@ -1099,6 +1209,33 @@
return ret;
}
+/* Soak up stderr from a script and redirect it to the error log.
+ * TODO: log_scripterror() and this could move to cgi_common.h. */
+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;
+ cgid_server_conf *conf = ap_get_module_config(r->server->module_config, &cgid_module);
+
+ while ((rv = apr_file_gets(argsbuffer, HUGE_STRING_LEN,
+ script_err)) == APR_SUCCESS) {
+
+ newline = strchr(argsbuffer, '\n');
+ if (newline) {
+ char *prev = newline - 1;
+ if (prev >= argsbuffer && *prev == '\r') {
+ newline = prev;
+ }
+
+ *newline = '\0';
+ }
+ log_scripterror(r, conf, r->status, 0, argsbuffer);
+ }
+
+ return rv;
+}
+
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)
@@ -1204,6 +1341,11 @@
return ret;
}
+#ifdef HAVE_CGID_FDPASSING
+/* Pull in CGI bucket implementation. */
+#include "cgi_common.h"
+#endif
+
static int connect_to_daemon(int *sdptr, request_rec *r,
cgid_server_conf *conf)
{
@@ -1395,6 +1537,7 @@
static int cgid_handler(request_rec *r)
{
+ conn_rec *c = r->connection;
int retval, nph, dbpos;
char *argv0, *dbuf;
apr_bucket_brigade *bb;
@@ -1404,10 +1547,11 @@
int seen_eos, child_stopped_reading;
int sd;
char **env;
- apr_file_t *tempsock;
+ apr_file_t *tempsock, *script_err, *errpipe_out;
struct cleanup_script_info *info;
apr_status_t rv;
cgid_dirconf *dc;
+ apr_interval_time_t timeout;
if (strcmp(r->handler, CGI_MAGIC_TYPE) && strcmp(r->handler, "cgi-script")) {
return DECLINED;
@@ -1416,7 +1560,7 @@
conf = ap_get_module_config(r->server->module_config, &cgid_module);
dc = ap_get_module_config(r->per_dir_config, &cgid_module);
-
+ timeout = dc->timeout > 0 ? dc->timeout : r->server->timeout;
is_included = !strcmp(r->protocol, "INCLUDED");
if ((argv0 = strrchr(r->filename, '/')) != NULL) {
@@ -1469,6 +1613,17 @@
}
*/
+#ifdef HAVE_CGID_FDPASSING
+ rv = apr_file_pipe_create(&script_err, &errpipe_out, r->pool);
+ if (rv) {
+ return log_scripterror(r, conf, HTTP_SERVICE_UNAVAILABLE, rv, APLOGNO(10176)
+ "could not create pipe for stderr");
+ }
+#else
+ script_err = NULL;
+ errpipe_out = NULL;
+#endif
+
/*
* httpd core function used to add common environment variables like
* DOCUMENT_ROOT.
@@ -1481,12 +1636,16 @@
return retval;
}
- rv = send_req(sd, r, argv0, env, CGI_REQ);
+ rv = send_req(sd, errpipe_out, r, argv0, env, CGI_REQ);
if (rv != APR_SUCCESS) {
ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01268)
"write to cgi daemon process");
}
+ /* The write-end of the pipe is only used by the server, so close
+ * it here. */
+ if (errpipe_out) apr_file_close(errpipe_out);
+
info = apr_palloc(r->pool, sizeof(struct cleanup_script_info));
info->conf = conf;
info->r = r;
@@ -1508,12 +1667,7 @@
*/
apr_os_pipe_put_ex(&tempsock, &sd, 1, r->pool);
- if (dc->timeout > 0) {
- apr_file_pipe_timeout_set(tempsock, dc->timeout);
- }
- else {
- apr_file_pipe_timeout_set(tempsock, r->server->timeout);
- }
+ apr_file_pipe_timeout_set(tempsock, timeout);
apr_pool_cleanup_kill(r->pool, (void *)((long)sd), close_unix_socket);
/* Transfer any put/post args, CERN style...
@@ -1605,23 +1759,28 @@
*/
shutdown(sd, 1);
+ bb = apr_brigade_create(r->pool, c->bucket_alloc);
+#ifdef HAVE_CGID_FDPASSING
+ b = cgi_bucket_create(r, dc->timeout, tempsock, script_err, c->bucket_alloc);
+ if (b == NULL)
+ return HTTP_INTERNAL_SERVER_ERROR; /* should call log_scripterror() w/ _UNAVAILABLE? */
+#else
+ b = apr_bucket_pipe_create(tempsock, 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) {
- conn_rec *c = r->connection;
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_ex(r, bb, sbuf,
APLOG_MODULE_INDEX)))
{
- ret = log_script(r, conf, ret, dbuf, sbuf, bb, NULL);
+ ret = log_script(r, conf, ret, dbuf, sbuf, bb, script_err);
/*
* ret could be HTTP_NOT_MODIFIED in the case that the CGI script
@@ -1658,6 +1817,11 @@
/* Soak up all the script output */
discard_script_output(bb);
apr_brigade_destroy(bb);
+ if (script_err) {
+ apr_file_pipe_timeout_set(script_err, timeout);
+ log_script_err(r, script_err);
+ }
+
/* This redirect needs to be a GET no matter what the original
* method was.
*/
@@ -1690,7 +1854,6 @@
}
if (nph) {
- conn_rec *c = r->connection;
struct ap_filter_t *cur;
/* get rid of all filters up through protocol... since we
@@ -1704,14 +1867,20 @@
}
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);
+ 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 (script_err && rv == APR_SUCCESS && !r->connection->aborted) {
+ apr_file_pipe_timeout_set(script_err, timeout);
+ log_script_err(r, script_err);
+ }
+
+ if (script_err) apr_file_close(script_err);
+
return OK; /* NOT r->status, even if it has changed. */
}
@@ -1829,7 +1998,7 @@
return retval;
}
- send_req(sd, r, command, env, SSI_REQ);
+ send_req(sd, NULL, r, command, env, SSI_REQ);
info = apr_palloc(r->pool, sizeof(struct cleanup_script_info));
info->conf = conf;
--- httpd-2.4.37/modules/generators/config5.m4
+++ httpd-2.4.37/modules/generators/config5.m4
@@ -78,4 +78,15 @@
APR_ADDTO(INCLUDES, [-I\$(top_srcdir)/$modpath_current])
+AC_ARG_ENABLE(cgid-fdpassing,
+ [APACHE_HELP_STRING(--enable-cgid-fdpassing,Enable experimental mod_cgid support for fd passing)],
+ [if test "$enableval" = "yes"; then
+ AC_CHECK_DECL(CMSG_DATA,
+ [AC_DEFINE([HAVE_CGID_FDPASSING], 1, [Enable FD passing support in mod_cgid])],
+ [AC_MSG_ERROR([cannot support mod_cgid fd-passing on this system])], [
+#include <sys/types.h>
+#include <sys/socket.h>])
+ fi
+])
+
APACHE_MODPATH_FINISH
--- httpd-2.4.37/modules/generators/cgi_common.h
+++ httpd-2.4.37/modules/generators/cgi_common.h
@@ -0,0 +1,216 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+#include "apr.h"
+#include "apr_strings.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"
+
+#include "httpd.h"
+#include "util_filter.h"
+
+/* 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;
+ apr_interval_time_t timeout;
+};
+
+/* 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_interval_time_t timeout,
+ 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);
+ if (rv != APR_SUCCESS) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01217)
+ "apr_pollset_create(); check system or user limits");
+ return NULL;
+ }
+
+ 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);
+ if (rv != APR_SUCCESS) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01218)
+ "apr_pollset_add(); check system or user limits");
+ return NULL;
+ }
+
+ fd.desc.f = err; /* script's stderr */
+ fd.client_data = (void *)2;
+ rv = apr_pollset_add(data->pollset, &fd);
+ if (rv != APR_SUCCESS) {
+ ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r, APLOGNO(01219)
+ "apr_pollset_add(); check system or user limits");
+ return NULL;
+ }
+
+ data->r = r;
+ data->timeout = timeout;
+ 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 = 0;
+ apr_status_t rv;
+ int gotdata = 0;
+
+ if (block != APR_NONBLOCK_READ) {
+ timeout = data->timeout > 0 ? data->timeout : 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, APLOGNO(01220)
+ "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, APLOGNO(01221)
+ "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
+};
+
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