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ngx_rtmp_exec_module.c
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/*
* Copyright (C) Roman Arutyunyan
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include "ngx_rtmp_cmd_module.h"
#include "ngx_rtmp_record_module.h"
#include "ngx_rtmp_eval.h"
#include <stdlib.h>
#ifdef NGX_LINUX
#include <unistd.h>
#endif
#if !(NGX_WIN32)
static ngx_rtmp_publish_pt next_publish;
static ngx_rtmp_play_pt next_play;
static ngx_rtmp_close_stream_pt next_close_stream;
static ngx_rtmp_record_done_pt next_record_done;
#endif
static ngx_int_t ngx_rtmp_exec_init_process(ngx_cycle_t *cycle);
static ngx_int_t ngx_rtmp_exec_postconfiguration(ngx_conf_t *cf);
static void * ngx_rtmp_exec_create_main_conf(ngx_conf_t *cf);
static char * ngx_rtmp_exec_init_main_conf(ngx_conf_t *cf, void *conf);
static void * ngx_rtmp_exec_create_app_conf(ngx_conf_t *cf);
static char * ngx_rtmp_exec_merge_app_conf(ngx_conf_t *cf,
void *parent, void *child);
/*static char * ngx_rtmp_exec_block(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);*/
static char * ngx_rtmp_exec_conf(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_rtmp_exec_kill_signal(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
#define NGX_RTMP_EXEC_RESPAWN 0x01
#define NGX_RTMP_EXEC_KILL 0x02
#define NGX_RTMP_EXEC_PUBLISHING 0x01
#define NGX_RTMP_EXEC_PLAYING 0x02
enum {
NGX_RTMP_EXEC_PUSH,
NGX_RTMP_EXEC_PULL,
NGX_RTMP_EXEC_PUBLISH,
NGX_RTMP_EXEC_PUBLISH_DONE,
NGX_RTMP_EXEC_PLAY,
NGX_RTMP_EXEC_PLAY_DONE,
NGX_RTMP_EXEC_RECORD_DONE,
NGX_RTMP_EXEC_MAX,
NGX_RTMP_EXEC_STATIC
};
typedef struct {
ngx_str_t id;
ngx_uint_t type;
ngx_str_t cmd;
ngx_array_t args; /* ngx_str_t */
ngx_array_t names;
} ngx_rtmp_exec_conf_t;
typedef struct {
ngx_rtmp_exec_conf_t *conf;
ngx_log_t *log;
ngx_rtmp_eval_t **eval;
void *eval_ctx;
unsigned active:1;
unsigned managed:1;
ngx_pid_t pid;
ngx_pid_t *save_pid;
int pipefd;
ngx_connection_t dummy_conn; /*needed by ngx_xxx_event*/
ngx_event_t read_evt, write_evt;
ngx_event_t respawn_evt;
ngx_msec_t respawn_timeout;
ngx_int_t kill_signal;
} ngx_rtmp_exec_t;
typedef struct {
ngx_array_t static_conf; /* ngx_rtmp_exec_conf_t */
ngx_array_t static_exec; /* ngx_rtmp_exec_t */
ngx_msec_t respawn_timeout;
ngx_int_t kill_signal;
ngx_log_t *log;
} ngx_rtmp_exec_main_conf_t;
typedef struct ngx_rtmp_exec_pull_ctx_s ngx_rtmp_exec_pull_ctx_t;
struct ngx_rtmp_exec_pull_ctx_s {
ngx_pool_t *pool;
ngx_uint_t counter;
ngx_str_t name;
ngx_str_t app;
ngx_array_t pull_exec; /* ngx_rtmp_exec_t */
ngx_rtmp_exec_pull_ctx_t *next;
};
typedef struct {
ngx_int_t active;
ngx_array_t conf[NGX_RTMP_EXEC_MAX];
/* ngx_rtmp_exec_conf_t */
ngx_flag_t respawn;
ngx_flag_t options;
ngx_uint_t nbuckets;
ngx_rtmp_exec_pull_ctx_t **pull;
} ngx_rtmp_exec_app_conf_t;
typedef struct {
ngx_uint_t flags;
ngx_str_t path; /* /tmp/rec/myfile-123.flv */
ngx_str_t filename; /* myfile-123.flv */
ngx_str_t basename; /* myfile-123 */
ngx_str_t dirname; /* /tmp/rec */
ngx_str_t recorder;
u_char name[NGX_RTMP_MAX_NAME];
u_char args[NGX_RTMP_MAX_ARGS];
ngx_array_t push_exec; /* ngx_rtmp_exec_t */
ngx_rtmp_exec_pull_ctx_t *pull;
} ngx_rtmp_exec_ctx_t;
#if !(NGX_WIN32)
static void ngx_rtmp_exec_respawn(ngx_event_t *ev);
static ngx_int_t ngx_rtmp_exec_kill(ngx_rtmp_exec_t *e, ngx_int_t kill_signal);
static ngx_int_t ngx_rtmp_exec_run(ngx_rtmp_exec_t *e);
#endif
static ngx_command_t ngx_rtmp_exec_commands[] = {
/*
{ ngx_string("exec_block"),
NGX_RTMP_APP_CONF|NGX_CONF_BLOCK|NGX_CONF_NOARGS|NGX_CONF_TAKE1,
ngx_rtmp_exec_block,
NGX_RTMP_APP_CONF_OFFSET,
0,
NULL },
*/
{ ngx_string("exec"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
ngx_rtmp_exec_conf,
NGX_RTMP_APP_CONF_OFFSET,
offsetof(ngx_rtmp_exec_app_conf_t, conf) +
NGX_RTMP_EXEC_PUSH * sizeof(ngx_array_t),
NULL },
{ ngx_string("exec_push"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
ngx_rtmp_exec_conf,
NGX_RTMP_APP_CONF_OFFSET,
offsetof(ngx_rtmp_exec_app_conf_t, conf) +
NGX_RTMP_EXEC_PUSH * sizeof(ngx_array_t),
NULL },
{ ngx_string("exec_pull"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
ngx_rtmp_exec_conf,
NGX_RTMP_APP_CONF_OFFSET,
offsetof(ngx_rtmp_exec_app_conf_t, conf) +
NGX_RTMP_EXEC_PULL * sizeof(ngx_array_t),
NULL },
{ ngx_string("exec_publish"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
ngx_rtmp_exec_conf,
NGX_RTMP_APP_CONF_OFFSET,
offsetof(ngx_rtmp_exec_app_conf_t, conf) +
NGX_RTMP_EXEC_PUBLISH * sizeof(ngx_array_t),
NULL },
{ ngx_string("exec_publish_done"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
ngx_rtmp_exec_conf,
NGX_RTMP_APP_CONF_OFFSET,
offsetof(ngx_rtmp_exec_app_conf_t, conf) +
NGX_RTMP_EXEC_PUBLISH_DONE * sizeof(ngx_array_t),
NULL },
{ ngx_string("exec_play"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
ngx_rtmp_exec_conf,
NGX_RTMP_APP_CONF_OFFSET,
offsetof(ngx_rtmp_exec_app_conf_t, conf) +
NGX_RTMP_EXEC_PLAY * sizeof(ngx_array_t),
NULL },
{ ngx_string("exec_play_done"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
ngx_rtmp_exec_conf,
NGX_RTMP_APP_CONF_OFFSET,
offsetof(ngx_rtmp_exec_app_conf_t, conf) +
NGX_RTMP_EXEC_PLAY_DONE * sizeof(ngx_array_t),
NULL },
{ ngx_string("exec_record_done"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_RTMP_REC_CONF|
NGX_CONF_1MORE,
ngx_rtmp_exec_conf,
NGX_RTMP_APP_CONF_OFFSET,
offsetof(ngx_rtmp_exec_app_conf_t, conf) +
NGX_RTMP_EXEC_RECORD_DONE * sizeof(ngx_array_t),
NULL },
{ ngx_string("exec_static"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_1MORE,
ngx_rtmp_exec_conf,
NGX_RTMP_MAIN_CONF_OFFSET,
offsetof(ngx_rtmp_exec_main_conf_t, static_conf),
NULL },
{ ngx_string("respawn"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_TAKE1,
ngx_conf_set_flag_slot,
NGX_RTMP_APP_CONF_OFFSET,
offsetof(ngx_rtmp_exec_app_conf_t, respawn),
NULL },
{ ngx_string("respawn_timeout"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_RTMP_MAIN_CONF_OFFSET,
offsetof(ngx_rtmp_exec_main_conf_t, respawn_timeout),
NULL },
{ ngx_string("exec_kill_signal"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_TAKE1,
ngx_rtmp_exec_kill_signal,
NGX_RTMP_MAIN_CONF_OFFSET,
0,
NULL },
{ ngx_string("exec_options"),
NGX_RTMP_MAIN_CONF|NGX_RTMP_SRV_CONF|NGX_RTMP_APP_CONF|NGX_CONF_TAKE1,
ngx_conf_set_flag_slot,
NGX_RTMP_APP_CONF_OFFSET,
offsetof(ngx_rtmp_exec_app_conf_t, options),
NULL },
ngx_null_command
};
static ngx_rtmp_module_t ngx_rtmp_exec_module_ctx = {
NULL, /* preconfiguration */
ngx_rtmp_exec_postconfiguration, /* postconfiguration */
ngx_rtmp_exec_create_main_conf, /* create main configuration */
ngx_rtmp_exec_init_main_conf, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_rtmp_exec_create_app_conf, /* create app configuration */
ngx_rtmp_exec_merge_app_conf /* merge app configuration */
};
ngx_module_t ngx_rtmp_exec_module = {
NGX_MODULE_V1,
&ngx_rtmp_exec_module_ctx, /* module context */
ngx_rtmp_exec_commands, /* module directives */
NGX_RTMP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
ngx_rtmp_exec_init_process, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static void
ngx_rtmp_exec_eval_ctx_cstr(void *sctx, ngx_rtmp_eval_t *e, ngx_str_t *ret)
{
ngx_rtmp_session_t *s = sctx;
ngx_rtmp_exec_ctx_t *ctx;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_exec_module);
if (ctx == NULL) {
ret->len = 0;
return;
}
ret->data = (u_char *) ctx + e->offset;
ret->len = ngx_strlen(ret->data);
}
static void
ngx_rtmp_exec_eval_ctx_str(void *sctx, ngx_rtmp_eval_t *e, ngx_str_t *ret)
{
ngx_rtmp_session_t *s = sctx;
ngx_rtmp_exec_ctx_t *ctx;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_exec_module);
if (ctx == NULL) {
ret->len = 0;
return;
}
*ret = * (ngx_str_t *) ((u_char *) ctx + e->offset);
}
static void
ngx_rtmp_exec_eval_pctx_str(void *ctx, ngx_rtmp_eval_t *e, ngx_str_t *ret)
{
*ret = *(ngx_str_t *) ((u_char *) ctx + e->offset);
}
static ngx_rtmp_eval_t ngx_rtmp_exec_push_specific_eval[] = {
{ ngx_string("name"),
ngx_rtmp_exec_eval_ctx_cstr,
offsetof(ngx_rtmp_exec_ctx_t, name) },
{ ngx_string("args"),
ngx_rtmp_exec_eval_ctx_cstr,
offsetof(ngx_rtmp_exec_ctx_t, args) },
ngx_rtmp_null_eval
};
static ngx_rtmp_eval_t * ngx_rtmp_exec_push_eval[] = {
ngx_rtmp_eval_session,
ngx_rtmp_exec_push_specific_eval,
NULL
};
static ngx_rtmp_eval_t ngx_rtmp_exec_pull_specific_eval[] = {
{ ngx_string("name"),
ngx_rtmp_exec_eval_pctx_str,
offsetof(ngx_rtmp_exec_pull_ctx_t, name) },
{ ngx_string("app"),
ngx_rtmp_exec_eval_pctx_str,
offsetof(ngx_rtmp_exec_pull_ctx_t, app) },
ngx_rtmp_null_eval
};
static ngx_rtmp_eval_t * ngx_rtmp_exec_pull_eval[] = {
ngx_rtmp_exec_pull_specific_eval,
NULL
};
static ngx_rtmp_eval_t ngx_rtmp_exec_event_specific_eval[] = {
{ ngx_string("name"),
ngx_rtmp_exec_eval_ctx_cstr,
offsetof(ngx_rtmp_exec_ctx_t, name) },
{ ngx_string("args"),
ngx_rtmp_exec_eval_ctx_cstr,
offsetof(ngx_rtmp_exec_ctx_t, args) },
{ ngx_string("path"),
ngx_rtmp_exec_eval_ctx_str,
offsetof(ngx_rtmp_exec_ctx_t, path) },
{ ngx_string("filename"),
ngx_rtmp_exec_eval_ctx_str,
offsetof(ngx_rtmp_exec_ctx_t, filename) },
{ ngx_string("basename"),
ngx_rtmp_exec_eval_ctx_str,
offsetof(ngx_rtmp_exec_ctx_t, basename) },
{ ngx_string("dirname"),
ngx_rtmp_exec_eval_ctx_str,
offsetof(ngx_rtmp_exec_ctx_t, dirname) },
{ ngx_string("recorder"),
ngx_rtmp_exec_eval_ctx_str,
offsetof(ngx_rtmp_exec_ctx_t, recorder) },
ngx_rtmp_null_eval
};
static ngx_rtmp_eval_t * ngx_rtmp_exec_event_eval[] = {
ngx_rtmp_eval_session,
ngx_rtmp_exec_event_specific_eval,
NULL
};
static void *
ngx_rtmp_exec_create_main_conf(ngx_conf_t *cf)
{
ngx_rtmp_exec_main_conf_t *emcf;
emcf = ngx_pcalloc(cf->pool, sizeof(ngx_rtmp_exec_main_conf_t));
if (emcf == NULL) {
return NULL;
}
emcf->respawn_timeout = NGX_CONF_UNSET_MSEC;
emcf->kill_signal = NGX_CONF_UNSET;
if (ngx_array_init(&emcf->static_conf, cf->pool, 1,
sizeof(ngx_rtmp_exec_conf_t)) != NGX_OK)
{
return NULL;
}
return emcf;
}
static char *
ngx_rtmp_exec_init_main_conf(ngx_conf_t *cf, void *conf)
{
ngx_rtmp_exec_main_conf_t *emcf = conf;
ngx_rtmp_exec_conf_t *ec;
ngx_rtmp_exec_t *e;
ngx_uint_t n;
if (emcf->respawn_timeout == NGX_CONF_UNSET_MSEC) {
emcf->respawn_timeout = 5000;
}
#if !(NGX_WIN32)
if (emcf->kill_signal == NGX_CONF_UNSET) {
emcf->kill_signal = SIGKILL;
}
#endif
if (ngx_array_init(&emcf->static_exec, cf->pool,
emcf->static_conf.nelts,
sizeof(ngx_rtmp_exec_t)) != NGX_OK)
{
return NGX_CONF_ERROR;
}
e = ngx_array_push_n(&emcf->static_exec, emcf->static_conf.nelts);
if (e == NULL) {
return NGX_CONF_ERROR;
}
emcf->log = &cf->cycle->new_log;
ec = emcf->static_conf.elts;
for (n = 0; n < emcf->static_conf.nelts; n++, e++, ec++) {
ngx_memzero(e, sizeof(*e));
e->conf = ec;
e->managed = 1;
e->log = emcf->log;
e->respawn_timeout = emcf->respawn_timeout;
e->kill_signal = emcf->kill_signal;
}
return NGX_CONF_OK;
}
static void *
ngx_rtmp_exec_create_app_conf(ngx_conf_t *cf)
{
ngx_rtmp_exec_app_conf_t *eacf;
eacf = ngx_pcalloc(cf->pool, sizeof(ngx_rtmp_exec_app_conf_t));
if (eacf == NULL) {
return NULL;
}
eacf->respawn = NGX_CONF_UNSET;
eacf->options = NGX_CONF_UNSET;
eacf->nbuckets = NGX_CONF_UNSET_UINT;
return eacf;
}
static ngx_int_t
ngx_rtmp_exec_merge_confs(ngx_array_t *conf, ngx_array_t *prev)
{
size_t n;
ngx_rtmp_exec_conf_t *ec, *pec;
if (prev->nelts == 0) {
return NGX_OK;
}
if (conf->nelts == 0) {
*conf = *prev;
return NGX_OK;
}
ec = ngx_array_push_n(conf, prev->nelts);
if (ec == NULL) {
return NGX_ERROR;
}
pec = prev->elts;
for (n = 0; n < prev->nelts; n++, ec++, pec++) {
*ec = *pec;
}
return NGX_OK;
}
static char *
ngx_rtmp_exec_merge_app_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_rtmp_exec_app_conf_t *prev = parent;
ngx_rtmp_exec_app_conf_t *conf = child;
ngx_uint_t n;
ngx_conf_merge_value(conf->respawn, prev->respawn, 1);
ngx_conf_merge_uint_value(conf->nbuckets, prev->nbuckets, 1024);
for (n = 0; n < NGX_RTMP_EXEC_MAX; n++) {
if (ngx_rtmp_exec_merge_confs(&conf->conf[n], &prev->conf[n]) != NGX_OK)
{
return NGX_CONF_ERROR;
}
if (conf->conf[n].nelts) {
conf->active = 1;
prev->active = 1;
}
}
if (conf->conf[NGX_RTMP_EXEC_PULL].nelts > 0) {
conf->pull = ngx_pcalloc(cf->pool, sizeof(void *) * conf->nbuckets);
if (conf->pull == NULL) {
return NGX_CONF_ERROR;
}
}
return NGX_CONF_OK;
}
static ngx_int_t
ngx_rtmp_exec_init_process(ngx_cycle_t *cycle)
{
#if !(NGX_WIN32)
ngx_rtmp_core_main_conf_t *cmcf = ngx_rtmp_core_main_conf;
ngx_rtmp_core_srv_conf_t **cscf;
ngx_rtmp_conf_ctx_t *cctx;
ngx_rtmp_exec_main_conf_t *emcf;
ngx_rtmp_exec_t *e;
ngx_uint_t n;
if (cmcf == NULL || cmcf->servers.nelts == 0) {
return NGX_OK;
}
/* execs are always started by the first worker */
if (ngx_process_slot) {
return NGX_OK;
}
cscf = cmcf->servers.elts;
cctx = (*cscf)->ctx;
emcf = cctx->main_conf[ngx_rtmp_exec_module.ctx_index];
/* FreeBSD note:
* When worker is restarted, child process (ffmpeg) will
* not be terminated if it's connected to another
* (still alive) worker. That leads to starting
* another instance of exec_static process.
* Need to kill previously started processes.
*
* On Linux "prctl" syscall is used to kill child
* when nginx worker is terminated.
*/
e = emcf->static_exec.elts;
for (n = 0; n < emcf->static_exec.nelts; ++n, ++e) {
e->respawn_evt.data = e;
e->respawn_evt.log = e->log;
e->respawn_evt.handler = ngx_rtmp_exec_respawn;
ngx_post_event((&e->respawn_evt), &ngx_rtmp_init_queue);
}
#endif
return NGX_OK;
}
#if !(NGX_WIN32)
static void
ngx_rtmp_exec_respawn(ngx_event_t *ev)
{
ngx_rtmp_exec_run((ngx_rtmp_exec_t *) ev->data);
}
static void
ngx_rtmp_exec_child_dead(ngx_event_t *ev)
{
ngx_connection_t *dummy_conn = ev->data;
ngx_rtmp_exec_t *e;
e = dummy_conn->data;
ngx_log_error(NGX_LOG_INFO, e->log, 0,
"exec: child %ui exited; %s", (ngx_int_t) e->pid,
e->respawn_timeout == NGX_CONF_UNSET_MSEC ? "respawning" :
"ignoring");
ngx_rtmp_exec_kill(e, 0);
if (e->respawn_timeout == NGX_CONF_UNSET_MSEC) {
return;
}
if (e->respawn_timeout == 0) {
ngx_rtmp_exec_run(e);
return;
}
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, e->log, 0,
"exec: shedule respawn %Mmsec", e->respawn_timeout);
e->respawn_evt.data = e;
e->respawn_evt.log = e->log;
e->respawn_evt.handler = ngx_rtmp_exec_respawn;
ngx_add_timer(&e->respawn_evt, e->respawn_timeout);
}
static ngx_int_t
ngx_rtmp_exec_kill(ngx_rtmp_exec_t *e, ngx_int_t kill_signal)
{
if (e->respawn_evt.timer_set) {
ngx_del_timer(&e->respawn_evt);
}
if (e->read_evt.active) {
ngx_del_event(&e->read_evt, NGX_READ_EVENT, 0);
}
if (e->active == 0) {
return NGX_OK;
}
ngx_log_error(NGX_LOG_INFO, e->log, 0,
"exec: terminating child %ui", (ngx_int_t) e->pid);
e->active = 0;
close(e->pipefd);
if (e->save_pid) {
*e->save_pid = NGX_INVALID_PID;
}
if (kill_signal == 0) {
return NGX_OK;
}
if (kill(e->pid, kill_signal) == -1) {
ngx_log_error(NGX_LOG_INFO, e->log, ngx_errno,
"exec: kill failed pid=%i", (ngx_int_t) e->pid);
} else {
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, e->log, 0,
"exec: killed pid=%i", (ngx_int_t) e->pid);
}
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_exec_run(ngx_rtmp_exec_t *e)
{
int fd, ret, maxfd, pipefd[2];
char **args, **arg_out;
ngx_pid_t pid;
ngx_str_t *arg_in, a;
ngx_uint_t n;
ngx_rtmp_exec_conf_t *ec;
ec = e->conf;
ngx_log_error(NGX_LOG_INFO, e->log, 0,
"exec: starting %s child '%V'",
e->managed ? "managed" : "unmanaged", &ec->cmd);
pipefd[0] = -1;
pipefd[1] = -1;
if (e->managed) {
if (e->active) {
ngx_log_debug1(NGX_LOG_DEBUG_RTMP, e->log, 0,
"exec: already active '%V'", &ec->cmd);
return NGX_OK;
}
if (pipe(pipefd) == -1) {
ngx_log_error(NGX_LOG_INFO, e->log, ngx_errno,
"exec: pipe failed");
return NGX_ERROR;
}
/* make pipe write end survive through exec */
ret = fcntl(pipefd[1], F_GETFD);
if (ret != -1) {
ret &= ~FD_CLOEXEC;
ret = fcntl(pipefd[1], F_SETFD, ret);
}
if (ret == -1) {
close(pipefd[0]);
close(pipefd[1]);
ngx_log_error(NGX_LOG_INFO, e->log, ngx_errno,
"exec: fcntl failed");
return NGX_ERROR;
}
}
pid = fork();
switch (pid) {
case -1:
/* failure */
if (pipefd[0] != -1) {
close(pipefd[0]);
}
if (pipefd[1] != -1) {
close(pipefd[1]);
}
ngx_log_error(NGX_LOG_INFO, e->log, ngx_errno,
"exec: fork failed");
return NGX_ERROR;
case 0:
/* child */
#if (NGX_LINUX)
if (e->managed) {
prctl(PR_SET_PDEATHSIG, e->kill_signal, 0, 0, 0);
}
#endif
/* close all descriptors but pipe write end */
maxfd = sysconf(_SC_OPEN_MAX);
for (fd = 0; fd < maxfd; ++fd) {
if (fd == pipefd[1]) {
continue;
}
close(fd);
}
fd = open("/dev/null", O_RDWR);
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
args = ngx_alloc((ec->args.nelts + 2) * sizeof(char *), e->log);
if (args == NULL) {
exit(1);
}
arg_in = ec->args.elts;
arg_out = args;
*arg_out++ = (char *) ec->cmd.data;
for (n = 0; n < ec->args.nelts; n++, ++arg_in) {
if (e->eval == NULL) {
a = *arg_in;
} else {
ngx_rtmp_eval(e->eval_ctx, arg_in, e->eval, &a, e->log);
}
if (ngx_rtmp_eval_streams(&a) != NGX_DONE) {
continue;
}
*arg_out++ = (char *) a.data;
}
*arg_out = NULL;
#if (NGX_DEBUG)
{
char **p;
for (p = args; *p; p++) {
ngx_write_fd(STDERR_FILENO, "'", 1);
ngx_write_fd(STDERR_FILENO, *p, strlen(*p));
ngx_write_fd(STDERR_FILENO, "' ", 2);
}
ngx_write_fd(STDERR_FILENO, "\n", 1);
}
#endif
if (execvp((char *) ec->cmd.data, args) == -1) {
char *msg;
msg = strerror(errno);
ngx_write_fd(STDERR_FILENO, "execvp error: ", 14);
ngx_write_fd(STDERR_FILENO, msg, strlen(msg));
ngx_write_fd(STDERR_FILENO, "\n", 1);
exit(1);
}
break;
default:
/* parent */
if (pipefd[1] != -1) {
close(pipefd[1]);
}
if (pipefd[0] != -1) {
e->active = 1;
e->pid = pid;
e->pipefd = pipefd[0];
if (e->save_pid) {
*e->save_pid = pid;
}
e->dummy_conn.fd = e->pipefd;
e->dummy_conn.data = e;
e->dummy_conn.read = &e->read_evt;
e->dummy_conn.write = &e->write_evt;
e->read_evt.data = &e->dummy_conn;
e->write_evt.data = &e->dummy_conn;
e->read_evt.log = e->log;
e->read_evt.handler = ngx_rtmp_exec_child_dead;
if (ngx_add_event(&e->read_evt, NGX_READ_EVENT, 0) != NGX_OK) {
ngx_log_error(NGX_LOG_INFO, e->log, ngx_errno,
"exec: failed to add child control event");
}
}
ngx_log_debug2(NGX_LOG_DEBUG_RTMP, e->log, 0,
"exec: child '%V' started pid=%i",
&ec->cmd, (ngx_int_t) pid);
break;
}
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_exec_init_ctx(ngx_rtmp_session_t *s, u_char name[NGX_RTMP_MAX_NAME],
u_char args[NGX_RTMP_MAX_ARGS], ngx_uint_t flags)
{
ngx_uint_t n;
ngx_array_t *push_conf;
ngx_rtmp_exec_t *e;
ngx_rtmp_exec_ctx_t *ctx;
ngx_rtmp_exec_conf_t *ec;
ngx_rtmp_exec_app_conf_t *eacf;
ngx_rtmp_exec_main_conf_t *emcf;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_exec_module);
if (ctx != NULL) {
goto done;
}
ctx = ngx_pcalloc(s->connection->pool, sizeof(ngx_rtmp_exec_ctx_t));
if (ctx == NULL) {
return NGX_ERROR;
}
ngx_rtmp_set_ctx(s, ctx, ngx_rtmp_exec_module);
eacf = ngx_rtmp_get_module_app_conf(s, ngx_rtmp_exec_module);
emcf = ngx_rtmp_get_module_main_conf(s, ngx_rtmp_exec_module);
push_conf = &eacf->conf[NGX_RTMP_EXEC_PUSH];
if (push_conf->nelts > 0) {
if (ngx_array_init(&ctx->push_exec, s->connection->pool,
push_conf->nelts,
sizeof(ngx_rtmp_exec_t)) != NGX_OK)
{
return NGX_ERROR;
}
e = ngx_array_push_n(&ctx->push_exec, push_conf->nelts);
if (e == NULL) {
return NGX_ERROR;
}
ec = push_conf->elts;
for (n = 0; n < push_conf->nelts; n++, e++, ec++) {
ngx_memzero(e, sizeof(*e));
e->conf = ec;
e->managed = 1;
e->log = s->connection->log;
e->eval = ngx_rtmp_exec_push_eval;
e->eval_ctx = s;
e->kill_signal = emcf->kill_signal;
e->respawn_timeout = (eacf->respawn ? emcf->respawn_timeout :
NGX_CONF_UNSET_MSEC);
}
}
done:
ngx_memcpy(ctx->name, name, NGX_RTMP_MAX_NAME);
ngx_memcpy(ctx->args, args, NGX_RTMP_MAX_ARGS);
ctx->flags |= flags;
return NGX_OK;
}
static ngx_int_t
ngx_rtmp_exec_init_pull_ctx(ngx_rtmp_session_t *s,
u_char name[NGX_RTMP_MAX_NAME])
{
size_t len;
ngx_uint_t n;
ngx_pool_t *pool;
ngx_array_t *pull_conf;
ngx_rtmp_exec_t *e;
ngx_rtmp_exec_ctx_t *ctx;
ngx_rtmp_exec_conf_t *ec;
ngx_rtmp_exec_pull_ctx_t *pctx, **ppctx;
ngx_rtmp_exec_app_conf_t *eacf;
ngx_rtmp_exec_main_conf_t *emcf;
ctx = ngx_rtmp_get_module_ctx(s, ngx_rtmp_exec_module);
if (ctx->pull != NULL) {
return NGX_OK;
}
eacf = ngx_rtmp_get_module_app_conf(s, ngx_rtmp_exec_module);
pull_conf = &eacf->conf[NGX_RTMP_EXEC_PULL];
if (pull_conf->nelts == 0) {
return NGX_OK;
}
emcf = ngx_rtmp_get_module_main_conf(s, ngx_rtmp_exec_module);
len = ngx_strlen(name);
ppctx = &eacf->pull[ngx_hash_key(name, len) % eacf->nbuckets];
for (; *ppctx; ppctx = &(*ppctx)->next) {