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/*
* rename_device.c: udev helper to rename ethernet devices.
*
* Copyright (C) 2006 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions of the
* GNU General Public License v.2.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <linux/sockios.h>
#include <net/if.h>
#include <glib.h>
#define LOCKFILE "/dev/.rename_device.lock"
void sighandler(int dummy) {
unlink(LOCKFILE);
_exit(1);
}
struct netdev {
char *hwaddr;
char *dev;
struct netdev *next;
};
struct tmp {
char *src;
char *target;
struct tmp *next;
};
struct netdev *configs = NULL;
struct netdev *devs = NULL;
struct tmp *tmplist = NULL;
#if defined(__s390__) || defined(__s390x__)
static int is_cdev(const struct dirent *dent) {
char *end = NULL;
if (strncmp(dent->d_name,"cdev",4))
return 0;
strtoul(dent->d_name+4,&end, 10);
if (*end)
return 0;
return 1;
}
static inline char *getdev(char *path, char *ent) {
char *a, *b, *ret;
asprintf(&a,"%s/%s",path,ent);
b = canonicalize_file_name(a);
ret = strdup(basename(b));
free(b);
free(a);
return ret;
}
char *read_subchannels(char *device) {
char *tmp, *path, *ret;
int n, x;
struct dirent **cdevs;
if (asprintf(&path,"/sys/class/net/%s/device",device) == -1)
return NULL;
if ((n = scandir(path, &cdevs, is_cdev, alphasort)) <= 0)
return NULL;
ret = getdev(path,cdevs[0]->d_name);
for (x = 1 ; x < n ; x++ ) {
if (asprintf(&tmp, "%s,%s", ret, getdev(path, cdevs[x]->d_name)) == -1)
return NULL;
free(ret);
ret = tmp;
}
free(path);
return ret;
}
#endif
struct netdev *get_devs() {
DIR *dir;
struct dirent *entry;
struct netdev *ret = NULL, *tmpdev;
dir = opendir("/sys/class/net");
if (!dir)
return NULL;
while ((entry = readdir(dir))) {
char *path;
gchar *contents;
contents = NULL;
if (!strcmp(entry->d_name,".") || !strcmp(entry->d_name,"..")) {
continue;
}
if (asprintf(&path,"/sys/class/net/%s/type",entry->d_name) == -1)
continue;
g_file_get_contents(path, &contents, NULL, NULL);
if (!contents) continue;
if (atoi(contents) >= 256) {
g_free(contents);
continue;
}
g_free(contents);
contents = NULL;
#if defined(__s390__) || defined(__s390x__)
contents = read_subchannels(entry->d_name);
#else
if (asprintf(&path,"/sys/class/net/%s/address",entry->d_name) == -1)
continue;
g_file_get_contents(path, &contents, NULL, NULL);
#endif /* mainframe */
if (!contents) continue;
contents = g_strstrip(contents);
tmpdev = calloc(1, sizeof(struct netdev));
tmpdev->dev = g_strstrip(g_strdup(entry->d_name));
tmpdev->hwaddr = g_strstrip(g_strdup(contents));
if (ret)
tmpdev->next = ret;
ret = tmpdev;
g_free(contents);
}
return ret;
}
int isCfg(const struct dirent *dent) {
int len = strlen(dent->d_name);
if (strncmp(dent->d_name,"ifcfg-",6))
return 0;
if (strstr(dent->d_name,"rpmnew") ||
strstr(dent->d_name,"rpmsave") ||
strstr(dent->d_name,"rpmorig"))
return 0;
if (dent->d_name[len-1] == '~')
return 0;
if (!strncmp(dent->d_name+len-4,".bak",4))
return 0;
return 1;
}
static inline char *dequote(char *start, char *end) {
if (end==NULL) {
end=start;
while(*end) end++;
}
if (end > start) end--;
if ((*start == '\'' || *start == '\"') && ( *start == *end ) ) {
*end='\0';
if (start<end) start++;
}
return start;
}
struct netdev *get_configs() {
int ncfgs = 0;
struct netdev *ret, *tmpdev;
struct dirent **cfgs;
int x;
ret = NULL;
if ((ncfgs = scandir("/etc/sysconfig/network-scripts",&cfgs,
isCfg, alphasort)) == -1) {
return ret;
}
for (x = 0; x < ncfgs; x++ ) {
char *path;
char *devname, *hwaddr;
gchar *contents, **lines;
int i;
devname = hwaddr = contents = NULL;
lines = NULL;
if (asprintf(&path,"/etc/sysconfig/network-scripts/%s",
cfgs[x]->d_name) == -1)
continue;
g_file_get_contents(path, &contents, NULL, NULL);
if (!contents)
continue;
lines = g_strsplit(contents,"\n", 0);
for (i = 0; lines[i]; i++) {
if (g_str_has_prefix(lines[i],"DEVICE=")) {
devname = lines[i] + 7;
/* ignore alias devices */
if (strchr(devname,':'))
devname = NULL;
}
#if defined(__s390__) || defined(__s390x__)
if (g_str_has_prefix(lines[i],"SUBCHANNELS=")) {
hwaddr = dequote(lines[i] + 12, NULL);
}
#else
if (g_str_has_prefix(lines[i],"HWADDR=")) {
hwaddr = dequote(lines[i] + 7, NULL);
}
#endif
}
if (!devname || !hwaddr) {
g_free(contents);
g_strfreev(lines);
continue;
}
tmpdev = calloc(1, sizeof(struct netdev));
tmpdev->dev = g_strstrip(g_strdup(devname));
tmpdev->hwaddr = g_strstrip(g_strdup(hwaddr));
if (ret)
tmpdev->next = ret;
ret = tmpdev;
g_free(contents);
g_strfreev(lines);
}
free(cfgs);
return ret;
}
char *get_hwaddr(char *device) {
struct netdev *dev;
for (dev = devs; dev; dev = dev->next)
if (!strcmp(dev->dev, device))
return dev->hwaddr;
return NULL;
}
char *get_config_by_hwaddr(char *hwaddr, char *current) {
struct netdev *config;
char *first = NULL;
if (!hwaddr) return NULL;
for (config = configs; config; config = config->next) {
if (strcasecmp(config->hwaddr, hwaddr) != 0)
continue;
if (!current || !strcasecmp(config->dev, current))
return config->dev;
if (!first)
first = config->dev;
}
return first;
}
char *get_device_by_hwaddr(char *hwaddr) {
struct netdev *dev;
if (!hwaddr) return NULL;
for (dev = devs; dev; dev = dev->next)
if (!strcasecmp(dev->hwaddr, hwaddr))
return dev->dev;
return NULL;
}
int do_rename(char *src, char *target) {
int sock;
struct ifreq ifr;
int ret;
sock = socket(PF_INET, SOCK_DGRAM, 0);
if (sock == -1)
return 1;
memset(&ifr,'\0', sizeof(struct ifreq));
g_strlcpy(ifr.ifr_name, src, IFNAMSIZ);
g_strlcpy(ifr.ifr_newname, target, IFNAMSIZ);
ret = ioctl(sock, SIOCSIFNAME, &ifr);
close(sock);
return ret;
}
void rename_device(char *src, char *target, struct netdev *current) {
int rc;
if (!current) {
current = calloc(1, sizeof(struct netdev));
current->dev = src;
}
rc = do_rename(src, target);
if (rc && errno != ENODEV) {
char *hw;
char *nconfig;
char *curdev;
char *dev = NULL;
struct netdev *i, *tmpdev;
char *fallback = NULL;
hw = get_hwaddr(target);
if (!hw) {
devs = get_devs();
hw = get_hwaddr(target);
if (!hw)
return;
}
nconfig = get_config_by_hwaddr(hw, NULL);
curdev = get_device_by_hwaddr(hw);
if (nconfig) {
dev = nconfig;
for (i = current; i; i = i->next) {
if (!strcmp(i->dev,dev)) {
fallback = dev;
dev = NULL;
}
}
}
if (!dev)
asprintf(&dev,"__tmp%d",rand());
if (!dev)
return;
if (fallback) {
struct tmp *ntmp = calloc(1, sizeof(struct tmp));
ntmp->src = strdup(dev);
ntmp->target = strdup(fallback);
if (tmplist)
ntmp->next = tmplist;
tmplist = ntmp;
}
tmpdev = calloc(1,sizeof(struct netdev));
tmpdev->dev = curdev;
if (current)
tmpdev->next = current;
current = tmpdev;
rename_device(curdev, dev, current);
do_rename(src,target);
}
}
void take_lock() {
int count = 0;
int lockfd;
while (1) {
lockfd = open(LOCKFILE, O_RDWR|O_CREAT|O_EXCL);
if (lockfd != -1) {
write(lockfd,"%d\n",getpid());
close(lockfd);
break;
}
count++;
/* If we've slept for 20 seconds, break the lock. */
if (count >= 200) {
int fd;
char buf[32];
int pid;
fd = open(LOCKFILE, O_RDONLY);
if (fd == -1)
break;
read(fd,buf,32);
close(fd);
pid = atoi(buf);
if (pid && pid != 1) {
kill(pid,SIGKILL);
}
}
usleep(100000);
continue;
}
return;
}
int main(int argc, char **argv) {
char *src, *target, *hw;
struct tmp *tmpdev;
struct timeval tv;
gettimeofday(&tv, NULL);
srand(tv.tv_usec);
take_lock();
signal(SIGSEGV,sighandler);
signal(SIGKILL,sighandler);
signal(SIGTERM,sighandler);
signal(SIGSEGV,sighandler);
signal(SIGALRM,sighandler);
alarm(10);
configs = get_configs();
devs = get_devs();
src = getenv("INTERFACE");
if (!src)
goto out_unlock;
hw = get_hwaddr(src);
if (!hw)
goto out_unlock;
target = get_config_by_hwaddr(hw, src);
if (!target || !strcmp(src,target))
goto out_unlock;
rename_device(src, target, NULL);
for (tmpdev = tmplist; tmpdev ; tmpdev = tmpdev->next) {
rename_device(tmpdev->src, tmpdev->target, NULL);
}
printf("INTERFACE=%s\n",target);
printf("DEVPATH=/class/net/%s\n", target);
out_unlock:
unlink(LOCKFILE);
exit(0);
}
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