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/*
* udevstart.c
*
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
*
* Quick and dirty way to populate a /dev with udev if your system
* does not have access to a shell. Based originally on a patch to udev
* from Harald Hoyer <harald@redhat.com>
*
* 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.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <signal.h>
#include <dirent.h>
#include <sys/wait.h>
#include "logging.h"
#ifdef LOG
unsigned char logname[42];
void log_message(int level, const char *format, ...)
{
va_list args;
va_start(args, format);
vsyslog(level, format, args);
va_end(args);
}
#endif
#define MAX_PATHLEN 1024
#define SYSBLOCK "/sys/block"
#define SYSCLASS "/sys/class"
static int execute_udev(char *path, char *value, int len)
{
int retval;
int res;
int status;
int fds[2];
pid_t pid;
int value_set = 0;
char buffer[255];
char *pos;
retval = pipe(fds);
if (retval != 0) {
dbg("pipe failed");
return -1;
}
pid = fork();
switch(pid) {
case 0:
/* child */
close(STDOUT_FILENO);
/* dup write side of pipe to STDOUT */
dup(fds[1]);
dbg("executing /sbin/udev '%s'", path);
retval = execl("/sbin/udev", "/sbin/udev", path, NULL);
info("execution of '%s' failed", path);
exit(1);
case -1:
dbg("fork failed");
return -1;
default:
/* parent reads from fds[0] */
close(fds[1]);
retval = 0;
while (1) {
res = read(fds[0], buffer, sizeof(buffer) - 1);
if (res <= 0)
break;
buffer[res] = '\0';
if (res > len) {
dbg("result len %d too short", len);
retval = -1;
}
if (value_set) {
dbg("result value already set");
retval = -1;
} else {
value_set = 1;
strncpy(value, buffer, len);
pos = value + strlen(value)-1;
if (pos[0] == '\n')
pos[0] = '\0';
dbg("result is '%s'", value);
}
}
close(fds[0]);
res = wait(&status);
if (res < 0) {
dbg("wait failed result %d", res);
retval = -1;
}
if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
dbg("exec program status 0x%x", status);
retval = -1;
}
}
return retval;
}
static int udev_scan(void)
{
char *devpath;
DIR *dir;
struct dirent *dent;
int retval = -EINVAL;
char scratch[200];
devpath = "block";
dir = opendir(SYSBLOCK);
if (dir) {
for (dent = readdir(dir); dent; dent = readdir(dir)) {
char dirname[MAX_PATHLEN];
DIR *dir2;
struct dirent *dent2;
if ((strcmp(dent->d_name, ".") == 0)
|| (strcmp(dent->d_name, "..") == 0))
continue;
snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
setenv("DEVPATH", dirname, 1);
dbg("udev block, 'DEVPATH' = '%s'", dirname);
execute_udev("block", scratch, sizeof(scratch));
snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
dir2 = opendir(dirname);
if (dir2) {
for (dent2 = readdir(dir2); dent2; dent2 = readdir(dir2)) {
char dirname2[MAX_PATHLEN];
DIR *dir3;
struct dirent *dent3;
if ((strcmp(dent2->d_name, ".") == 0) ||
(strcmp(dent2->d_name, "..") == 0))
continue;
snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
dir3 = opendir(dirname2);
if (dir3) {
for (dent3 = readdir(dir3); dent3; dent3 = readdir(dir3)) {
char filename[MAX_PATHLEN];
if (strcmp(dent3->d_name, "dev") == 0) {
snprintf(filename, MAX_PATHLEN, "/block/%s/%s", dent->d_name, dent2->d_name);
setenv("DEVPATH", filename, 1);
dbg("udev block, 'DEVPATH' = '%s'", filename);
execute_udev("block", scratch, sizeof(scratch));
}
}
}
}
}
}
}
devpath = "class";
dir = opendir(SYSCLASS);
if (dir) {
for (dent = readdir(dir); dent; dent = readdir(dir)) {
char dirname[MAX_PATHLEN];
DIR *dir2;
struct dirent *dent2;
if ((strcmp(dent->d_name, ".") == 0)
|| (strcmp(dent->d_name, "..") == 0))
continue;
snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
dir2 = opendir(dirname);
if (dir2) {
for (dent2 = readdir(dir2); dent2; dent2 = readdir(dir2)) {
char dirname2[MAX_PATHLEN];
DIR *dir3;
struct dirent *dent3;
if ((strcmp(dent2->d_name, ".") == 0) || (strcmp(dent2->d_name, "..") == 0))
continue;
snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
dir3 = opendir(dirname2);
if (dir3) {
for (dent3 = readdir(dir3); dent3; dent3 = readdir(dir3)) {
char
filename[MAX_PATHLEN];
if (strcmp(dent3->d_name, "dev") == 0) {
snprintf
(filename,
MAX_PATHLEN,
"/class/%s/%s", dent->d_name, dent2->d_name);
setenv("DEVPATH", filename, 1);
dbg("udev '%s', 'DEVPATH' = '%s'", dent->d_name, filename);
execute_udev(dent->d_name, scratch, sizeof(scratch));
}
}
}
}
}
}
}
if (retval > 0)
retval = 0;
return -retval;
}
int main(int argc, char **argv, char **envp)
{
init_logging("udevstart");
setenv("ACTION", "add", 1);
setenv("UDEV_NO_SLEEP", "1", 1);
return udev_scan();
}
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