X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udevsend.c;h=1b9860baca5ecfbf6537958a4a0edc27265a4722;hp=f92ee2b5d8286aa539c575355ee76368b2d43ee6;hb=cee5700cde26053bcf26c61fc2b9aa8f98d27acd;hpb=35b7d88c0dab4c1104c127ddd644db22307949c9 diff --git a/udevsend.c b/udevsend.c index f92ee2b5d..1b9860bac 100644 --- a/udevsend.c +++ b/udevsend.c @@ -1,12 +1,9 @@ /* * udevsend.c * - * Userspace devfs - * * Copyright (C) 2004 Ling, Xiaofeng * Copyright (C) 2004 Kay Sievers * - * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation version 2 of the License. @@ -22,169 +19,121 @@ * */ -#include -#include -#include -#include #include #include -#include +#include #include +#include #include -#include +#include +#include +#include +#include +#include +#include #include "udev.h" -#include "udev_version.h" #include "udevd.h" -#include "logging.h" -static inline char *get_action(void) -{ - char *action; - - action = getenv("ACTION"); - return action; -} +/* global variables */ +static int sock = -1; -static inline char *get_devpath(void) +#ifdef USE_LOG +void log_message (int priority, const char *format, ...) { - char *devpath; + va_list args; - devpath = getenv("DEVPATH"); - return devpath; -} - -static inline char *get_seqnum(void) -{ - char *seqnum; - - seqnum = getenv("SEQNUM"); - return seqnum; -} + if (priority > udev_log_priority) + return; -static int build_hotplugmsg(struct hotplug_msg *msg, char *action, - char *devpath, char *subsystem, int seqnum) -{ - memset(msg, 0x00, sizeof(*msg)); - msg->mtype = HOTPLUGMSGTYPE; - msg->seqnum = seqnum; - strncpy(msg->action, action, 8); - strncpy(msg->devpath, devpath, 128); - strncpy(msg->subsystem, subsystem, 16); - return sizeof(struct hotplug_msg); -} - -static int start_daemon(void) -{ - pid_t pid; - pid_t child_pid; - - pid = fork(); - switch (pid) { - case 0: - /* helper child */ - child_pid = fork(); - switch (child_pid) { - case 0: - /* daemon */ - setsid(); - chdir("/"); - execl(UDEVD_BIN, "udevd", NULL); - dbg("exec of daemon failed"); - exit(1); - case -1: - dbg("fork of daemon failed"); - return -1; - default: - exit(0); - } - break; - case -1: - dbg("fork of helper failed"); - return -1; - default: - wait(NULL); - } - return 0; + va_start(args, format); + vsyslog(priority, format, args); + va_end(args); } +#endif - -int main(int argc, char* argv[]) +int main(int argc, char *argv[], char *envp[]) { - int msgid; - key_t key; - struct msqid_ds msg_queue; - struct hotplug_msg message; - char *action; - char *devpath; - char *subsystem; - char *seqnum; - int seq; - int retval = -EINVAL; - int size; - int loop; - struct timespec tspec; - - subsystem = argv[1]; - if (subsystem == NULL) { - dbg("no subsystem"); + static struct udevd_msg usend_msg; + int usend_msg_len; + int i; + struct sockaddr_un saddr; + socklen_t addrlen; + int bufpos = 0; + int retval = 0; + const char *subsystem = NULL; + + logging_init("udevsend"); +#ifdef USE_LOG + udev_config_init(); +#endif + dbg("version %s", UDEV_VERSION); + + sock = socket(AF_LOCAL, SOCK_DGRAM, 0); + if (sock < 0) { + err("error getting socket: %s", strerror(errno)); + retval = 1; goto exit; } - devpath = get_devpath(); - if (devpath == NULL) { - dbg("no devpath"); - goto exit; - } + memset(&saddr, 0x00, sizeof(struct sockaddr_un)); + saddr.sun_family = AF_LOCAL; + /* use abstract namespace for socket path */ + strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH); + addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1; - action = get_action(); - if (action == NULL) { - dbg("no action"); - goto exit; - } + memset(&usend_msg, 0x00, sizeof(struct udevd_msg)); + strcpy(usend_msg.magic, UDEV_MAGIC); + usend_msg.type = UDEVD_UEVENT_UDEVSEND; - seqnum = get_seqnum(); - if (seqnum == NULL) { - dbg("no seqnum"); - goto exit; - } - seq = atoi(seqnum); - - /* create ipc message queue or get id of our existing one */ - key = ftok(UDEVD_BIN, IPC_KEY_ID); - dbg("using ipc queue 0x%0x", key); - size = build_hotplugmsg(&message, action, devpath, subsystem, seq); - msgid = msgget(key, IPC_CREAT); - if (msgid == -1) { - dbg("error open ipc queue"); - goto exit; - } + /* copy all keys to send buffer */ + for (i = 0; envp[i]; i++) { + const char *key; + int keylen; - /* send ipc message to the daemon */ - retval = msgsnd(msgid, &message, size, 0); - if (retval == -1) { - dbg("error sending ipc message"); - goto exit; - } + key = envp[i]; + keylen = strlen(key); - /* get state of ipc queue */ - tspec.tv_sec = 0; - tspec.tv_nsec = 10000000; /* 10 millisec */ - loop = UDEVSEND_RETRY_COUNT; - while (loop--) { - retval = msgctl(msgid, IPC_STAT, &msg_queue); - if (retval == -1) { - dbg("error getting info on ipc queue"); + /* ignore events which are already sent on the netlink socket */ + if (strncmp(key, "SEQNUM=", 7) == 0) { + dbg("ignoring event with SEQNUM set"); + retval = 0; goto exit; } - if (msg_queue.msg_qnum == 0) + + /* prevent loops in the scripts we execute */ + if (strncmp(key, "UDEVD_EVENT=", 12) == 0) { + err("event loop, already passed through the daemon, exit"); + retval = 2; goto exit; - nanosleep(&tspec, NULL); + } + + if (bufpos + keylen >= UEVENT_BUFFER_SIZE-1) { + err("environment buffer too small, probably not called by the kernel"); + continue; + } + + /* remember the SUBSYSTEM */ + if (strncmp(key, "SUBSYSTEM=", 10) == 0) + subsystem = &key[10]; + + dbg("add '%s' to env[%i] buffer", key, i); + strcpy(&usend_msg.envbuf[bufpos], key); + bufpos += keylen + 1; } - info("message is still in the ipc queue, starting daemon..."); - retval = start_daemon(); + usend_msg_len = offsetof(struct udevd_msg, envbuf) + bufpos; + dbg("usend_msg_len=%i", usend_msg_len); + + if (sendto(sock, &usend_msg, usend_msg_len, 0, (struct sockaddr *)&saddr, addrlen) < 0) { + retval = 3; + err("error sending message: %s", strerror(errno)); + } exit: + if (sock != -1) + close(sock); + + logging_close(); return retval; }