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/*
* udev_utils_run.c - execute programs from udev and read its output
*
* Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
*
* 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 <stdio.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/wait.h>
#include "udev_libc_wrapper.h"
#include "udev.h"
#include "logging.h"
#include "udev_utils.h"
#include "list.h"
int pass_env_to_socket(const char *sockname, const char *devpath, const char *action)
{
int sock;
struct sockaddr_un saddr;
socklen_t addrlen;
char buf[2048];
size_t bufpos = 0;
int i;
int retval;
dbg("pass environment to socket '%s'", sockname);
sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
memset(&saddr, 0x00, sizeof(struct sockaddr_un));
saddr.sun_family = AF_LOCAL;
/* only abstract namespace is supported */
strcpy(&saddr.sun_path[1], sockname);
addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
bufpos = snprintf(buf, sizeof(buf)-1, "%s@%s", action, devpath);
bufpos++;
for (i = 0; environ[i] != NULL && bufpos < sizeof(buf); i++) {
bufpos += strlcpy(&buf[bufpos], environ[i], sizeof(buf) - bufpos-1);
bufpos++;
}
retval = sendto(sock, &buf, bufpos, 0, (struct sockaddr *)&saddr, addrlen);
if (retval != -1)
retval = 0;
close(sock);
return retval;
}
int execute_program(const char *command, const char *subsystem,
char *result, size_t ressize, size_t *reslen)
{
int retval = 0;
int count;
int status;
int pipefds[2];
pid_t pid;
char *pos;
char arg[PATH_SIZE];
char *argv[(sizeof(arg) / 2) + 1];
int devnull;
int i;
size_t len;
strlcpy(arg, command, sizeof(arg));
i = 0;
if (strchr(arg, ' ')) {
pos = arg;
while (pos != NULL) {
if (pos[0] == '\'') {
/* don't separate if in apostrophes */
pos++;
argv[i] = strsep(&pos, "\'");
while (pos && pos[0] == ' ')
pos++;
} else {
argv[i] = strsep(&pos, " ");
}
dbg("arg[%i] '%s'", i, argv[i]);
i++;
}
argv[i] = NULL;
dbg("execute '%s' with parsed arguments", arg);
} else {
argv[0] = arg;
argv[1] = (char *) subsystem;
argv[2] = NULL;
dbg("execute '%s' with subsystem '%s' argument", arg, argv[1]);
}
if (result) {
if (pipe(pipefds) != 0) {
err("pipe failed");
return -1;
}
}
pid = fork();
switch(pid) {
case 0:
/* child dup2 write side of pipe to STDOUT */
devnull = open("/dev/null", O_RDWR);
if (devnull >= 0) {
dup2(devnull, STDIN_FILENO);
if (!result)
dup2(devnull, STDOUT_FILENO);
dup2(devnull, STDERR_FILENO);
close(devnull);
}
if (result)
dup2(pipefds[1], STDOUT_FILENO);
execv(arg, argv);
err("exec of program failed");
_exit(1);
case -1:
err("fork of '%s' failed", arg);
return -1;
default:
/* parent reads from pipefds[0] */
if (result) {
close(pipefds[1]);
len = 0;
while (1) {
count = read(pipefds[0], result + len, ressize - len-1);
if (count < 0) {
err("read failed with '%s'", strerror(errno));
retval = -1;
break;
}
if (count == 0)
break;
len += count;
if (len >= ressize-1) {
err("ressize %ld too short", (long)ressize);
retval = -1;
break;
}
}
result[len] = '\0';
close(pipefds[0]);
if (reslen)
*reslen = len;
}
waitpid(pid, &status, 0);
if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
dbg("exec program status 0x%x", status);
retval = -1;
}
}
return retval;
}
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