X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udevsend.c;h=0ba1b58a4ba380a49095d0fa4e7f1822c996b6ad;hp=19922f3870728cdd394cbfcb6b0827d569c8e59d;hb=daff48063eb2cb547d24a547684543ee991f0815;hpb=2b41e68a08548ce44b4d145900dab2bb04cd34f7 diff --git a/udevsend.c b/udevsend.c index 19922f387..0ba1b58a4 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. @@ -22,33 +19,37 @@ * */ -#include -#include -#include -#include -#include -#include #include #include #include -#include #include +#include +#include +#include +#include +#include +#include +#include #include #include "udev.h" -#include "udev_lib.h" #include "udev_version.h" #include "udevd.h" #include "logging.h" -#ifdef LOG -unsigned char logname[LOGNAME_SIZE]; -void log_message (int level, const char *format, ...) +/* global variables */ +static int sock = -1; + +#ifdef USE_LOG +void log_message (int priority, const char *format, ...) { - va_list args; + va_list args; + + if (priority > udev_log_priority) + return; va_start(args, format); - vsyslog(level, format, args); + vsyslog(priority, format, args); va_end(args); } #endif @@ -57,6 +58,8 @@ static int start_daemon(void) { pid_t pid; pid_t child_pid; + char *const argv[] = { "udevd", NULL }; + char *const envp[] = { NULL }; pid = fork(); switch (pid) { @@ -65,21 +68,20 @@ static int start_daemon(void) child_pid = fork(); switch (child_pid) { case 0: - /* daemon */ - setsid(); - chdir("/"); - execl(UDEVD_BIN, "udevd", NULL); - dbg("exec of daemon failed"); - exit(1); + /* daemon with empty environment */ + close(sock); + execve(UDEVD_BIN, argv, envp); + err("exec of daemon failed"); + _exit(1); case -1: - dbg("fork of daemon failed"); + err("fork of daemon failed"); return -1; default: exit(0); } break; case -1: - dbg("fork of helper failed"); + err("fork of helper failed"); return -1; default: waitpid(pid, NULL, 0); @@ -89,123 +91,127 @@ static int start_daemon(void) static void run_udev(const char *subsystem) { + char *const argv[] = { "udev", (char *)subsystem, NULL }; pid_t pid; pid = fork(); switch (pid) { case 0: /* child */ - execl(UDEV_BIN, "udev", subsystem, NULL); - dbg("exec of child failed"); + execv(UDEV_BIN, argv); + err("exec of udev child failed"); _exit(1); break; case -1: - dbg("fork of child failed"); + err("fork of udev child failed"); break; default: waitpid(pid, NULL, 0); } } -int main(int argc, char* argv[]) +int main(int argc, char *argv[], char *envp[]) { - struct hotplug_msg msg; - char *action; - char *devpath; - char *subsystem; - char *seqnum; - unsigned long long seq; - int retval = 1; + static struct udevd_msg usend_msg; + int usend_msg_len; + int i; int loop; - int sock = -1; struct sockaddr_un saddr; socklen_t addrlen; + int bufpos = 0; + int retval = 1; int started_daemon = 0; + const char *subsystem = NULL; logging_init("udevsend"); +#ifdef USE_LOG + udev_init_config(); +#endif dbg("version %s", UDEV_VERSION); - subsystem = get_subsystem(argv[1]); - if (subsystem == NULL) { - dbg("no subsystem"); - goto exit; - } - dbg("subsystem = '%s'", subsystem); - - devpath = get_devpath(); - if (devpath == NULL) { - dbg("no devpath"); - goto exit; - } - dbg("DEVPATH = '%s'", devpath); - - action = get_action(); - if (action == NULL) { - dbg("no action"); - goto exit; - } - dbg("ACTION = '%s'", action); - - seqnum = get_seqnum(); - if (seqnum == NULL) - seq = 0; - else - seq = strtoull(seqnum, NULL, 10); - dbg("SEQNUM = '%llu'", seq); - sock = socket(AF_LOCAL, SOCK_DGRAM, 0); if (sock == -1) { - dbg("error getting socket"); + err("error getting socket"); goto fallback; } - set_cloexec_flag(sock, 1); - 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; - memset(&msg, 0x00, sizeof(struct hotplug_msg)); - strcpy(msg.magic, UDEV_MAGIC); - msg.seqnum = seq; - strfieldcpy(msg.action, action); - strfieldcpy(msg.devpath, devpath); - strfieldcpy(msg.subsystem, subsystem); + memset(&usend_msg, 0x00, sizeof(struct udevd_msg)); + strcpy(usend_msg.magic, UDEV_MAGIC); + usend_msg.type = UDEVD_UEVENT_UDEVSEND; + + /* copy all keys to send buffer */ + for (i = 0; envp[i]; i++) { + const char *key; + int keylen; + + key = envp[i]; + keylen = strlen(key); + + /* prevent loops in the scripts we execute */ + if (strncmp(key, "UDEVD_EVENT=", 12) == 0) { + dbg("seems that the event source is not the kernel, just exit"); + goto exit; + } + + 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; + } + /* older kernels passed the SUBSYSTEM only as the first argument */ + if (!subsystem && argc == 2) { + bufpos += sprintf(&usend_msg.envbuf[bufpos], "SUBSYSTEM=%s", argv[1]) + 1; + dbg("add 'SUBSYSTEM=%s' to env[%i] buffer from argv", argv[1], i); + } + + usend_msg_len = offsetof(struct udevd_msg, envbuf) + bufpos; + dbg("usend_msg_len=%i", usend_msg_len); /* If we can't send, try to start daemon and resend message */ - loop = SEND_WAIT_MAX_SECONDS * SEND_WAIT_LOOP_PER_SECOND; + loop = UDEVSEND_WAIT_MAX_SECONDS * UDEVSEND_WAIT_LOOP_PER_SECOND; while (--loop) { - retval = sendto(sock, &msg, sizeof(struct hotplug_msg), 0, - (struct sockaddr *)&saddr, addrlen); + retval = sendto(sock, &usend_msg, usend_msg_len, 0, (struct sockaddr *)&saddr, addrlen); if (retval != -1) { retval = 0; goto exit; } if (errno != ECONNREFUSED) { - dbg("error sending message"); + err("error sending message (%s)", strerror(errno)); goto fallback; } if (!started_daemon) { - dbg("try to start udevd daemon"); + info("try to start udevd daemon"); retval = start_daemon(); if (retval) { - info("error starting daemon"); + dbg("error starting daemon"); goto fallback; } - info("udevd daemon started"); + dbg("udevd daemon started"); started_daemon = 1; } else { - dbg("retry to connect %d", SEND_WAIT_MAX_SECONDS * SEND_WAIT_LOOP_PER_SECOND - loop); - usleep(1000 * 1000 / SEND_WAIT_LOOP_PER_SECOND); + dbg("retry to connect %d", UDEVSEND_WAIT_MAX_SECONDS * UDEVSEND_WAIT_LOOP_PER_SECOND - loop); + usleep(1000 * 1000 / UDEVSEND_WAIT_LOOP_PER_SECOND); } } fallback: - info("unable to connect to event daemon, try to call udev directly"); + err("unable to connect to event daemon, try to call udev directly"); run_udev(subsystem); exit: