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icecast-server/src/event_exec.c

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/* Icecast
*
* This program is distributed under the GNU General Public License, version 2.
* A copy of this license is included with this source.
*
* Copyright 2014-2018, Philipp "ph3-der-loewe" Schafft <lion@lion.leolix.org>,
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include <errno.h>
#ifndef _WIN32
#include <sys/wait.h>
/* for __setup_empty_script_environment() */
#include <sys/stat.h>
#include <fcntl.h>
#endif
#include "event.h"
#include "global.h"
#include "source.h"
#include "logging.h"
#define CATMODULE "event_exec"
typedef enum event_exec_argvtype_tag {
ARGVTYPE_NO_DEFAULTS = 0,
ARGVTYPE_ONLY_URI,
ARGVTYPE_URI_AND_TRIGGER,
ARGVTYPE_LEGACY,
ARGVTYPE_DFAULT = ARGVTYPE_LEGACY
} event_exec_argvtype_t;
typedef struct event_exec {
/* name and path of executable */
char *executable;
/* what to add to argv[] */
event_exec_argvtype_t argvtype;
/* actual argv[] */
char **argv;
} event_exec_t;
/* OS independed code: */
static inline size_t __argvtype2offset(event_exec_argvtype_t argvtype) {
switch (argvtype) {
case ARGVTYPE_NO_DEFAULTS: return 1; break;
case ARGVTYPE_ONLY_URI: return 2; break;
case ARGVTYPE_URI_AND_TRIGGER: return 3; break;
case ARGVTYPE_LEGACY: return 2; break;
default: return 0; break; /* This should never happen. */
}
}
/* BEFORE RELEASE 2.5.0 DOCUMENT: Document names of possible values. */
static inline event_exec_argvtype_t __str2argvtype(const char *str) {
if (!str)
str = "(BAD VALUE)";
if (strcmp(str, "default") == 0) {
return ARGVTYPE_DFAULT;
} else if (strcmp(str, "no_defaults") == 0) {
return ARGVTYPE_NO_DEFAULTS;
} else if (strcmp(str, "uri") == 0) {
return ARGVTYPE_ONLY_URI;
} else if (strcmp(str, "uri_and_trigger") == 0) {
return ARGVTYPE_URI_AND_TRIGGER;
} else if (strcmp(str, "legacy") == 0) {
return ARGVTYPE_LEGACY;
} else {
ICECAST_LOG_ERROR("Unknown argument type %s, using \"default\"", str);
return ARGVTYPE_DFAULT;
}
}
static inline char **__setup_argv(event_exec_t *self, event_t *event) {
self->argv[0] = self->executable;
switch (self->argvtype) {
case ARGVTYPE_NO_DEFAULTS:
/* nothing to do */
break;
case ARGVTYPE_URI_AND_TRIGGER:
self->argv[2] = event->trigger ? event->trigger : "";
/* fall through */
case ARGVTYPE_ONLY_URI:
self->argv[1] = event->uri ? event->uri : "";
break;
case ARGVTYPE_LEGACY:
/* This mode is similar to ARGVTYPE_ONLY_URI
* but if URI is unknown the parameter is skipped!
*/
if (event->uri) {
self->argv[1] = event->uri;
} else {
self->argv[1] = self->executable;
return &self->argv[1];
}
break;
}
return self->argv;
}
/* OS depended code: */
#ifdef _WIN32
/* TODO #2101: Implement script executing on win* */
#else
/* this sets up the new environment for script execution.
* We ignore most failtures as we can not handle them anyway.
*/
#ifdef HAVE_SETENV
static inline void __update_environ(const char *name, const char *value) {
if (!name || !value) return;
setenv(name, value, 1);
}
#else
#define __update_environ(x,y)
#endif
static inline void __setup_environ(ice_config_t *config, event_exec_t *self, event_t *event) {
mount_proxy *mountinfo;
source_t *source;
char buf[80];
/* BEFORE RELEASE 2.5.0 DOCUMENT: Document all those env vars. */
__update_environ("ICECAST_VERSION", ICECAST_VERSION_STRING);
__update_environ("ICECAST_HOSTNAME", config->hostname);
__update_environ("ICECAST_ADMIN", config->admin);
__update_environ("ICECAST_LOGDIR", config->log_dir);
__update_environ("EVENT_URI", event->uri);
__update_environ("EVENT_TRIGGER", event->trigger); /* new name */
__update_environ("SOURCE_ACTION", event->trigger); /* old name (deprecated) */
__update_environ("CLIENT_IP", event->connection_ip);
__update_environ("CLIENT_ROLE", event->client_role);
__update_environ("CLIENT_USERNAME", event->client_username);
__update_environ("CLIENT_USERAGENT", event->client_useragent);
snprintf(buf, sizeof(buf), "%lu", event->connection_id);
__update_environ("CLIENT_ID", buf);
snprintf(buf, sizeof(buf), "%lli", (long long int)event->connection_time);
__update_environ("CLIENT_CONNECTION_TIME", buf);
snprintf(buf, sizeof(buf), "%i", event->client_admin_command);
__update_environ("CLIENT_ADMIN_COMMAND", buf);
mountinfo = config_find_mount(config, event->uri, MOUNT_TYPE_NORMAL);
if (mountinfo) {
__update_environ("MOUNT_NAME", mountinfo->stream_name);
__update_environ("MOUNT_DESCRIPTION", mountinfo->stream_description);
__update_environ("MOUNT_URL", mountinfo->stream_url);
__update_environ("MOUNT_GENRE", mountinfo->stream_genre);
}
avl_tree_rlock(global.source_tree);
source = source_find_mount(event->uri);
if (source) {
__update_environ("SOURCE_MOUNTPOINT", source->mount);
__update_environ("SOURCE_PUBLIC", source->yp_public ? "true" : "false");
__update_environ("SROUCE_HIDDEN", source->hidden ? "true" : "false");
}
avl_tree_unlock(global.source_tree);
}
static inline void __setup_file_descriptors(ice_config_t *config) {
int i;
/* close at least the first 1024 handles */
for (i = 0; i < 1024; i++)
close(i);
/* open null device */
i = open(config->null_device, O_RDWR);
if (i != -1) {
/* attach null device to stdin, stdout and stderr */
if (i != 0)
dup2(i, 0);
if (i != 1)
dup2(i, 1);
if (i != 2)
dup2(i, 2);
/* close null device */
if (i > 2)
close(i);
}
}
static inline void __setup_empty_script_environment(event_exec_t *self, event_t *event) {
ice_config_t *config = config_get_config();
__setup_file_descriptors(config);
__setup_environ(config, self, event);
config_release_config();
}
static void _run_script (event_exec_t *self, event_t *event) {
pid_t pid, external_pid;
/* do a fork twice so that the command has init as parent */
external_pid = fork();
switch (external_pid)
{
case 0:
switch (pid = fork ())
{
case -1:
ICECAST_LOG_ERROR("Unable to fork %s (%s)", self->executable, strerror (errno));
break;
case 0: /* child */
if (access(self->executable, R_OK|X_OK) != 0) {
ICECAST_LOG_ERROR("Unable to run command %s (%s)", self->executable, strerror(errno));
exit(1);
}
ICECAST_LOG_DEBUG("Starting command %s", self->executable);
__setup_empty_script_environment(self, event);
execv(self->executable, __setup_argv(self, event));
exit(1);
default: /* parent */
break;
}
exit (0);
case -1:
ICECAST_LOG_ERROR("Unable to fork %s", strerror (errno));
break;
default: /* parent */
waitpid (external_pid, NULL, 0);
break;
}
}
#endif
static int event_exec_emit(void *state, event_t *event) {
event_exec_t *self = state;
#ifdef _WIN32
/* BEFORE RELEASE 2.5.0 DOCUMENT: Document this not working on win*. */
ICECAST_LOG_ERROR("<event type=\"exec\" ...> not supported on Windows");
#else
_run_script(self, event);
#endif
return 0;
}
static void event_exec_free(void *state) {
event_exec_t *self = state;
size_t i;
for (i = __argvtype2offset(self->argvtype); self->argv[i]; i++)
free(self->argv[i]);
free(self->argv);
free(self->executable);
free(self);
}
int event_get_exec(event_registration_t *er, config_options_t *options) {
event_exec_t *self = calloc(1, sizeof(event_exec_t));
config_options_t *cur;
size_t extra_argc = 0;
if (!self)
return -1;
self->argvtype = ARGVTYPE_DFAULT;
if ((cur = options)) {
do {
if (cur->name) {
/* BEFORE RELEASE 2.5.0 DOCUMENT: Document supported options:
* <option name="executable" value="..." />
* <option name="default_arguments" value="..." /> (for values see near top of documment)
*/
if (strcmp(cur->name, "executable") == 0) {
util_replace_string(&(self->executable), cur->value);
} else if (strcmp(cur->name, "default_arguments") == 0) {
self->argvtype = __str2argvtype(cur->value);
} else {
ICECAST_LOG_ERROR("Unknown <option> tag with name %s.", cur->name);
}
} else if (cur->type) {
if (strcmp(cur->type, "argument") == 0) {
extra_argc++;
} else {
ICECAST_LOG_ERROR("Unknown <option> tag with type %s.", cur->type);
}
}
} while ((cur = cur->next));
}
if (!self->executable) {
ICECAST_LOG_ERROR("No executable given.");
event_exec_free(self);
return -1;
}
self->argv = calloc(__argvtype2offset(self->argvtype) + extra_argc + 1, sizeof(char*));
if (!self->argv) {
ICECAST_LOG_ERROR("Can not allocate argv[]");
event_exec_free(self);
return -1;
}
extra_argc = __argvtype2offset(self->argvtype);
if ((cur = options)) {
do {
if (cur->type) {
/* BEFORE RELEASE 2.5.0 DOCUMENT: Document supported options:
* <option type="argument" value="..." />
*/
if (strcmp(cur->type, "argument") == 0) {
if (cur->value) {
self->argv[extra_argc] = strdup(cur->value);
if (!self->argv[extra_argc]) {
ICECAST_LOG_ERROR("Can not allocate argv[x]");
event_exec_free(self);
return -1;
}
extra_argc++;
}
} else {
ICECAST_LOG_ERROR("Unknown <option> tag with type %s.", cur->type);
}
}
} while ((cur = cur->next));
}
er->state = self;
er->emit = event_exec_emit;
er->free = event_exec_free;
return 0;
}
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