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7fafc032 KS |
1 | /* |
2 | * udevsend.c | |
3 | * | |
4 | * Userspace devfs | |
5 | * | |
6 | * Copyright (C) 2004 Ling, Xiaofeng <xiaofeng.ling@intel.com> | |
7 | * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> | |
8 | * | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the | |
12 | * Free Software Foundation version 2 of the License. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write to the Free Software Foundation, Inc., | |
21 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <sys/types.h> | |
0be0c18d GKH |
26 | #include <sys/socket.h> |
27 | #include <sys/wait.h> | |
28 | #include <sys/un.h> | |
7fafc032 KS |
29 | #include <errno.h> |
30 | #include <stdio.h> | |
31 | #include <stdlib.h> | |
1dadabd7 | 32 | #include <stddef.h> |
7fafc032 | 33 | #include <string.h> |
33db4b8d KS |
34 | #include <unistd.h> |
35 | #include <time.h> | |
2f6cbd19 | 36 | #include <linux/stddef.h> |
7fafc032 KS |
37 | |
38 | #include "udev.h" | |
35b7d88c | 39 | #include "udev_version.h" |
7fafc032 KS |
40 | #include "udevd.h" |
41 | #include "logging.h" | |
42 | ||
d026a35d | 43 | #ifdef LOG |
d00bd172 | 44 | unsigned char logname[LOGNAME_SIZE]; |
d026a35d | 45 | void log_message (int level, const char *format, ...) |
51a8bb2f | 46 | { |
d026a35d GKH |
47 | va_list args; |
48 | ||
49 | va_start(args, format); | |
50 | vsyslog(level, format, args); | |
51 | va_end(args); | |
51a8bb2f | 52 | } |
d026a35d | 53 | #endif |
51a8bb2f | 54 | |
71c077fb | 55 | static int build_hotplugmsg(struct hotplug_msg *msg, char *action, |
7fafc032 KS |
56 | char *devpath, char *subsystem, int seqnum) |
57 | { | |
35b7d88c | 58 | memset(msg, 0x00, sizeof(*msg)); |
53921bfa | 59 | strfieldcpy(msg->magic, UDEV_MAGIC); |
71c077fb | 60 | msg->seqnum = seqnum; |
c472e3c8 KS |
61 | strfieldcpy(msg->action, action); |
62 | strfieldcpy(msg->devpath, devpath); | |
63 | strfieldcpy(msg->subsystem, subsystem); | |
7fafc032 KS |
64 | return sizeof(struct hotplug_msg); |
65 | } | |
66 | ||
33db4b8d KS |
67 | static int start_daemon(void) |
68 | { | |
69 | pid_t pid; | |
70 | pid_t child_pid; | |
71 | ||
72 | pid = fork(); | |
73 | switch (pid) { | |
74 | case 0: | |
75 | /* helper child */ | |
76 | child_pid = fork(); | |
77 | switch (child_pid) { | |
78 | case 0: | |
79 | /* daemon */ | |
a695feae | 80 | setsid(); |
2a25816f | 81 | chdir("/"); |
35b7d88c | 82 | execl(UDEVD_BIN, "udevd", NULL); |
33db4b8d KS |
83 | dbg("exec of daemon failed"); |
84 | exit(1); | |
85 | case -1: | |
86 | dbg("fork of daemon failed"); | |
87 | return -1; | |
88 | default: | |
89 | exit(0); | |
90 | } | |
91 | break; | |
92 | case -1: | |
93 | dbg("fork of helper failed"); | |
94 | return -1; | |
95 | default: | |
a695feae | 96 | wait(NULL); |
33db4b8d KS |
97 | } |
98 | return 0; | |
99 | } | |
100 | ||
7fafc032 KS |
101 | int main(int argc, char* argv[]) |
102 | { | |
0028653c | 103 | struct hotplug_msg msg; |
7fafc032 KS |
104 | char *action; |
105 | char *devpath; | |
106 | char *subsystem; | |
107 | char *seqnum; | |
108 | int seq; | |
2f6cbd19 | 109 | int retval = 1; |
7fafc032 | 110 | int size; |
33db4b8d KS |
111 | int loop; |
112 | struct timespec tspec; | |
53921bfa KS |
113 | int sock; |
114 | struct sockaddr_un saddr; | |
1dadabd7 | 115 | socklen_t addrlen; |
2f6cbd19 | 116 | int started_daemon = 0; |
7fafc032 | 117 | |
e047ca9b | 118 | #ifdef DEBUG |
95a6f4c8 | 119 | init_logging("udevsend"); |
e047ca9b | 120 | #endif |
8bbf2751 | 121 | dbg("version %s", UDEV_VERSION); |
95a6f4c8 | 122 | |
e964c2c0 | 123 | subsystem = get_subsystem(argv[1]); |
7fafc032 KS |
124 | if (subsystem == NULL) { |
125 | dbg("no subsystem"); | |
126 | goto exit; | |
127 | } | |
8bbf2751 | 128 | dbg("subsystem = '%s'", subsystem); |
7fafc032 KS |
129 | |
130 | devpath = get_devpath(); | |
131 | if (devpath == NULL) { | |
132 | dbg("no devpath"); | |
133 | goto exit; | |
134 | } | |
8bbf2751 | 135 | dbg("DEVPATH = '%s'", devpath); |
7fafc032 KS |
136 | |
137 | action = get_action(); | |
138 | if (action == NULL) { | |
139 | dbg("no action"); | |
140 | goto exit; | |
141 | } | |
8bbf2751 | 142 | dbg("ACTION = '%s'", action); |
7fafc032 KS |
143 | |
144 | seqnum = get_seqnum(); | |
86590cd5 | 145 | if (seqnum == NULL) |
2f6cbd19 | 146 | seq = -1; |
86590cd5 KS |
147 | else |
148 | seq = atoi(seqnum); | |
8bbf2751 | 149 | dbg("SEQNUM = '%d'", seq); |
7b15897b | 150 | |
2f6cbd19 | 151 | sock = socket(AF_LOCAL, SOCK_DGRAM, 0); |
53921bfa KS |
152 | if (sock == -1) { |
153 | dbg("error getting socket"); | |
7fafc032 KS |
154 | goto exit; |
155 | } | |
156 | ||
53921bfa KS |
157 | memset(&saddr, 0x00, sizeof(saddr)); |
158 | saddr.sun_family = AF_LOCAL; | |
872344c4 KS |
159 | /* use abstract namespace for socket path */ |
160 | strcpy(&saddr.sun_path[1], UDEVD_SOCK_PATH); | |
1dadabd7 | 161 | addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1; |
53921bfa | 162 | |
0028653c KS |
163 | size = build_hotplugmsg(&msg, action, devpath, subsystem, seq); |
164 | ||
2f6cbd19 KS |
165 | /* If we can't send, try to start daemon and resend message */ |
166 | loop = UDEVSEND_CONNECT_RETRY; | |
167 | while (loop--) { | |
7b1cbec9 | 168 | retval = sendto(sock, &msg, size, 0, (struct sockaddr *)&saddr, addrlen); |
2f6cbd19 KS |
169 | if (retval != -1) { |
170 | retval = 0; | |
171 | goto close_and_exit; | |
172 | } | |
173 | ||
174 | if (errno != ECONNREFUSED) { | |
175 | dbg("error sending message"); | |
176 | goto close_and_exit; | |
177 | } | |
178 | ||
179 | if (!started_daemon) { | |
180 | dbg("connect failed, try starting daemon..."); | |
181 | retval = start_daemon(); | |
182 | if (retval) { | |
183 | dbg("error starting daemon"); | |
184 | goto exit; | |
185 | } | |
186 | ||
53921bfa | 187 | dbg("daemon started"); |
2f6cbd19 | 188 | started_daemon = 1; |
53921bfa | 189 | } else { |
2f6cbd19 KS |
190 | dbg("retry to connect %d", UDEVSEND_CONNECT_RETRY - loop); |
191 | tspec.tv_sec = 0; | |
192 | tspec.tv_nsec = 100000000; /* 100 millisec */ | |
193 | nanosleep(&tspec, NULL); | |
53921bfa | 194 | } |
7fafc032 | 195 | } |
2f6cbd19 KS |
196 | |
197 | close_and_exit: | |
198 | close(sock); | |
33db4b8d | 199 | exit: |
2f6cbd19 | 200 | return retval; |
7fafc032 | 201 | } |