From 9851e517f1c3e55228e2fdde913c9cf0b87a4bc7 Mon Sep 17 00:00:00 2001 From: Jo-Philipp Wich Date: Thu, 26 Feb 2015 12:27:39 +0100 Subject: [PATCH] procd: support relayoing daemon stdout/stderr to syslog This commit adds support to procd for relaying stdout and stderr streams to the system log. That is mainly useful for services not using syslog, e.g. uhttpd. Signed-off-by: Jo-Philipp Wich --- service/instance.c | 141 +++++++++++++++++++++++++++++++++++++++++---- service/instance.h | 3 + 2 files changed, 134 insertions(+), 10 deletions(-) diff --git a/service/instance.c b/service/instance.c index 6dfc61b..6787ae0 100644 --- a/service/instance.c +++ b/service/instance.c @@ -20,6 +20,7 @@ #include #include #include +#include #include @@ -42,6 +43,8 @@ enum { INSTANCE_ATTR_WATCH, INSTANCE_ATTR_ERROR, INSTANCE_ATTR_USER, + INSTANCE_ATTR_STDOUT, + INSTANCE_ATTR_STDERR, __INSTANCE_ATTR_MAX }; @@ -58,6 +61,8 @@ static const struct blobmsg_policy instance_attr[__INSTANCE_ATTR_MAX] = { [INSTANCE_ATTR_WATCH] = { "watch", BLOBMSG_TYPE_ARRAY }, [INSTANCE_ATTR_ERROR] = { "error", BLOBMSG_TYPE_ARRAY }, [INSTANCE_ATTR_USER] = { "user", BLOBMSG_TYPE_STRING }, + [INSTANCE_ATTR_STDOUT] = { "stdout", BLOBMSG_TYPE_BOOL }, + [INSTANCE_ATTR_STDERR] = { "stderr", BLOBMSG_TYPE_BOOL }, }; struct instance_netdev { @@ -93,6 +98,12 @@ static const struct rlimit_name rlimit_names[] = { { NULL, 0 } }; +static void closefd(int fd) +{ + if (fd > STDERR_FILENO) + close(fd); +} + static void instance_limits(const char *limit, const char *value) { @@ -126,13 +137,13 @@ instance_limits(const char *limit, const char *value) } static void -instance_run(struct service_instance *in) +instance_run(struct service_instance *in, int stdout, int stderr) { struct blobmsg_list_node *var; struct blob_attr *cur; char **argv; int argc = 1; /* NULL terminated */ - int rem, fd; + int rem, stdin; if (in->nice) setpriority(PRIO_PROCESS, 0, in->nice); @@ -153,14 +164,28 @@ instance_run(struct service_instance *in) argv[argc++] = blobmsg_data(cur); argv[argc] = NULL; - fd = open("/dev/null", O_RDWR); - if (fd > -1) { - dup2(fd, STDIN_FILENO); - dup2(fd, STDOUT_FILENO); - dup2(fd, STDERR_FILENO); - if (fd > STDERR_FILENO) - close(fd); + + stdin = open("/dev/null", O_RDONLY); + + if (stdout == -1) + stdout = open("/dev/null", O_WRONLY); + + if (stderr == -1) + stderr = open("/dev/null", O_WRONLY); + + if (stdin > -1) { + dup2(stdin, STDIN_FILENO); + closefd(stdin); } + if (stdout > -1) { + dup2(stdout, STDOUT_FILENO); + closefd(stdout); + } + if (stderr > -1) { + dup2(stderr, STDERR_FILENO); + closefd(stderr); + } + if (in->uid || in->gid) { setuid(in->uid); setgid(in->gid); @@ -173,6 +198,8 @@ void instance_start(struct service_instance *in) { int pid; + int opipe[2] = { -1, -1 }; + int epipe[2] = { -1, -1 }; if (!avl_is_empty(&in->errors.avl)) { LOG("Not starting instance %s::%s, an error was indicated\n", in->srv->name, in->name); @@ -182,6 +209,20 @@ instance_start(struct service_instance *in) if (in->proc.pending) return; + if (in->stdout.fd.fd > -2) { + if (pipe(opipe)) { + ULOG_WARN("pipe() failed: %d (%s)\n", errno, strerror(errno)); + opipe[0] = opipe[1] = -1; + } + } + + if (in->stderr.fd.fd > -2) { + if (pipe(epipe)) { + ULOG_WARN("pipe() failed: %d (%s)\n", errno, strerror(errno)); + epipe[0] = epipe[1] = -1; + } + } + in->restart = false; in->halt = !in->respawn; @@ -194,7 +235,9 @@ instance_start(struct service_instance *in) if (!pid) { uloop_done(); - instance_run(in); + closefd(opipe[0]); + closefd(epipe[0]); + instance_run(in, opipe[1], epipe[1]); return; } @@ -202,9 +245,63 @@ instance_start(struct service_instance *in) in->proc.pid = pid; clock_gettime(CLOCK_MONOTONIC, &in->start); uloop_process_add(&in->proc); + + if (opipe[0] > -1) { + ustream_fd_init(&in->stdout, opipe[0]); + closefd(opipe[1]); + } + + if (epipe[0] > -1) { + ustream_fd_init(&in->stderr, epipe[0]); + closefd(epipe[1]); + } + service_event("instance.start", in->srv->name, in->name); } +static void +instance_stdio(struct ustream *s, int prio, struct service_instance *in) +{ + char *newline, *str, *arg0, ident[32]; + int len; + + do { + str = ustream_get_read_buf(s, NULL); + if (!str) + break; + + newline = strchr(str, '\n'); + if (!newline) + break; + + *newline = 0; + len = newline + 1 - str; + + arg0 = basename(blobmsg_data(blobmsg_data(in->command))); + snprintf(ident, sizeof(ident), "%s[%d]", arg0, in->proc.pid); + + ulog_open(ULOG_STDIO|ULOG_SYSLOG, LOG_DAEMON, ident); + ulog(prio, "%s\n", str); + ulog_open(ULOG_STDIO|ULOG_SYSLOG, LOG_DAEMON, "procd"); + + ustream_consume(s, len); + } while (1); +} + +static void +instance_stdout(struct ustream *s, int bytes) +{ + instance_stdio(s, LOG_INFO, + container_of(s, struct service_instance, stdout.stream)); +} + +static void +instance_stderr(struct ustream *s, int bytes) +{ + instance_stdio(s, LOG_ERR, + container_of(s, struct service_instance, stderr.stream)); +} + static void instance_timeout(struct uloop_timeout *t) { @@ -471,6 +568,12 @@ instance_config_parse(struct service_instance *in) } } + if (tb[INSTANCE_ATTR_STDOUT] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDOUT])) + in->stdout.fd.fd = -1; + + if (tb[INSTANCE_ATTR_STDERR] && blobmsg_get_bool(tb[INSTANCE_ATTR_STDERR])) + in->stderr.fd.fd = -1; + instance_fill_any(&in->data, tb[INSTANCE_ATTR_DATA]); if (!instance_fill_array(&in->env, tb[INSTANCE_ATTR_ENV], NULL, false)) @@ -546,6 +649,16 @@ instance_update(struct service_instance *in, struct service_instance *in_new) void instance_free(struct service_instance *in) { + if (in->stdout.fd.fd > -1) { + ustream_free(&in->stdout.stream); + close(in->stdout.fd.fd); + } + + if (in->stderr.fd.fd > -1) { + ustream_free(&in->stderr.stream); + close(in->stderr.fd.fd); + } + uloop_process_delete(&in->proc); uloop_timeout_cancel(&in->timeout); trigger_del(in); @@ -565,6 +678,14 @@ instance_init(struct service_instance *in, struct service *s, struct blob_attr * in->timeout.cb = instance_timeout; in->proc.cb = instance_exit; + in->stdout.fd.fd = -2; + in->stdout.stream.string_data = true; + in->stdout.stream.notify_read = instance_stdout; + + in->stderr.fd.fd = -2; + in->stderr.stream.string_data = true; + in->stderr.stream.notify_read = instance_stderr; + blobmsg_list_init(&in->netdev, struct instance_netdev, node, instance_netdev_cmp); blobmsg_list_init(&in->file, struct instance_file, node, instance_file_cmp); blobmsg_list_simple_init(&in->env); diff --git a/service/instance.h b/service/instance.h index f76e795..56ce797 100644 --- a/service/instance.h +++ b/service/instance.h @@ -17,6 +17,7 @@ #include #include +#include #include "../utils/utils.h" #define RESPAWN_ERROR (5 * 60) @@ -45,6 +46,8 @@ struct service_instance { struct blob_attr *config; struct uloop_process proc; struct uloop_timeout timeout; + struct ustream_fd stdout; + struct ustream_fd stderr; struct blob_attr *command; struct blob_attr *trigger; -- 2.25.1