[1108] | 1 | |
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| 2 | /* |
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| 3 | * rename_device.c: udev helper to rename ethernet devices. |
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| 4 | * |
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| 5 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. |
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| 6 | * |
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| 7 | * This copyrighted material is made available to anyone wishing to use, |
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| 8 | * modify, copy, or redistribute it subject to the terms and conditions of the |
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| 9 | * GNU General Public License v.2. |
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| 10 | * |
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| 11 | * This program is distributed in the hope that it will be useful, but WITHOUT |
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| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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| 14 | * more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU General Public License along |
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| 17 | * with this program; if not, write to the Free Software Foundation, Inc., |
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| 18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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| 19 | */ |
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| 20 | |
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| 21 | |
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| 22 | #include <dirent.h> |
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| 23 | #include <errno.h> |
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| 24 | #include <fcntl.h> |
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| 25 | #include <signal.h> |
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| 26 | #include <stdio.h> |
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| 27 | #include <stdlib.h> |
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| 28 | #include <string.h> |
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| 29 | #include <unistd.h> |
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| 30 | |
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| 31 | #include <sys/ioctl.h> |
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| 32 | #include <sys/time.h> |
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| 33 | #include <sys/types.h> |
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| 34 | |
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| 35 | #include <linux/sockios.h> |
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| 36 | |
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| 37 | #include <net/if.h> |
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| 38 | |
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| 39 | #include <glib.h> |
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| 40 | |
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| 41 | #define LOCKFILE "/dev/.rename_device.lock" |
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| 42 | |
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| 43 | void sighandler(int dummy) { |
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| 44 | unlink(LOCKFILE); |
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| 45 | _exit(1); |
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| 46 | } |
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| 47 | |
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| 48 | struct netdev { |
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| 49 | char *hwaddr; |
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| 50 | char *dev; |
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| 51 | struct netdev *next; |
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| 52 | }; |
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| 53 | |
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| 54 | struct tmp { |
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| 55 | char *src; |
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| 56 | char *target; |
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| 57 | struct tmp *next; |
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| 58 | }; |
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| 59 | |
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| 60 | struct netdev *configs = NULL; |
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| 61 | struct netdev *devs = NULL; |
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| 62 | struct tmp *tmplist = NULL; |
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| 63 | |
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| 64 | #if defined(__s390__) || defined(__s390x__) |
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| 65 | static int is_cdev(const struct dirent *dent) { |
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| 66 | char *end = NULL; |
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| 67 | |
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| 68 | if (strncmp(dent->d_name,"cdev",4)) |
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| 69 | return 0; |
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| 70 | strtoul(dent->d_name+4,&end, 10); |
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| 71 | if (*end) |
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| 72 | return 0; |
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| 73 | return 1; |
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| 74 | } |
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| 75 | |
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| 76 | static inline char *getdev(char *path, char *ent) { |
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| 77 | char *a, *b, *ret; |
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| 78 | |
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| 79 | asprintf(&a,"%s/%s",path,ent); |
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| 80 | b = canonicalize_file_name(a); |
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| 81 | ret = strdup(basename(b)); |
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| 82 | free(b); |
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| 83 | free(a); |
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| 84 | return ret; |
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| 85 | } |
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| 86 | |
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| 87 | char *read_subchannels(char *device) { |
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| 88 | char *tmp, *path, *ret; |
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| 89 | int n, x; |
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| 90 | struct dirent **cdevs; |
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| 91 | |
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| 92 | if (asprintf(&path,"/sys/class/net/%s/device",device) == -1) |
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| 93 | return NULL; |
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| 94 | if ((n = scandir(path, &cdevs, is_cdev, alphasort)) <= 0) |
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| 95 | return NULL; |
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| 96 | |
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| 97 | ret = getdev(path,cdevs[0]->d_name); |
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| 98 | for (x = 1 ; x < n ; x++ ) { |
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| 99 | if (asprintf(&tmp, "%s,%s", ret, getdev(path, cdevs[x]->d_name)) == -1) |
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| 100 | return NULL; |
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| 101 | free(ret); |
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| 102 | ret = tmp; |
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| 103 | } |
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| 104 | free(path); |
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| 105 | return ret; |
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| 106 | } |
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| 107 | |
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| 108 | #endif |
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| 109 | |
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| 110 | struct netdev *get_devs() { |
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| 111 | DIR *dir; |
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| 112 | struct dirent *entry; |
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| 113 | struct netdev *ret = NULL, *tmpdev; |
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| 114 | |
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| 115 | dir = opendir("/sys/class/net"); |
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| 116 | if (!dir) |
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| 117 | return NULL; |
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| 118 | while ((entry = readdir(dir))) { |
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| 119 | char *path; |
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| 120 | gchar *contents; |
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| 121 | |
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| 122 | contents = NULL; |
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| 123 | |
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| 124 | if (!strcmp(entry->d_name,".") || !strcmp(entry->d_name,"..")) { |
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| 125 | continue; |
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| 126 | } |
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| 127 | if (asprintf(&path,"/sys/class/net/%s/type",entry->d_name) == -1) |
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| 128 | continue; |
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| 129 | g_file_get_contents(path, &contents, NULL, NULL); |
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| 130 | if (!contents) continue; |
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| 131 | if (atoi(contents) >= 256) { |
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| 132 | g_free(contents); |
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| 133 | continue; |
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| 134 | } |
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| 135 | g_free(contents); |
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| 136 | contents = NULL; |
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| 137 | #if defined(__s390__) || defined(__s390x__) |
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| 138 | contents = read_subchannels(entry->d_name); |
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| 139 | #else |
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| 140 | if (asprintf(&path,"/sys/class/net/%s/address",entry->d_name) == -1) |
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| 141 | continue; |
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| 142 | g_file_get_contents(path, &contents, NULL, NULL); |
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| 143 | #endif /* mainframe */ |
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| 144 | if (!contents) continue; |
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| 145 | contents = g_strstrip(contents); |
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| 146 | tmpdev = calloc(1, sizeof(struct netdev)); |
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| 147 | tmpdev->dev = g_strstrip(g_strdup(entry->d_name)); |
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| 148 | tmpdev->hwaddr = g_strstrip(g_strdup(contents)); |
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| 149 | if (ret) |
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| 150 | tmpdev->next = ret; |
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| 151 | ret = tmpdev; |
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| 152 | g_free(contents); |
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| 153 | } |
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| 154 | return ret; |
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| 155 | } |
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| 156 | |
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| 157 | int isCfg(const struct dirent *dent) { |
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| 158 | int len = strlen(dent->d_name); |
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| 159 | |
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| 160 | if (strncmp(dent->d_name,"ifcfg-",6)) |
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| 161 | return 0; |
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| 162 | if (strstr(dent->d_name,"rpmnew") || |
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| 163 | strstr(dent->d_name,"rpmsave") || |
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| 164 | strstr(dent->d_name,"rpmorig")) |
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| 165 | return 0; |
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| 166 | if (dent->d_name[len-1] == '~') |
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| 167 | return 0; |
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| 168 | if (!strncmp(dent->d_name+len-4,".bak",4)) |
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| 169 | return 0; |
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| 170 | return 1; |
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| 171 | } |
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| 172 | |
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| 173 | static inline char *dequote(char *start, char *end) { |
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| 174 | if (end==NULL) { |
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| 175 | end=start; |
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| 176 | while(*end) end++; |
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| 177 | } |
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| 178 | if (end > start) end--; |
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| 179 | if ((*start == '\'' || *start == '\"') && ( *start == *end ) ) { |
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| 180 | *end='\0'; |
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| 181 | if (start<end) start++; |
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| 182 | } |
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| 183 | return start; |
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| 184 | } |
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| 185 | |
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| 186 | struct netdev *get_configs() { |
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| 187 | int ncfgs = 0; |
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| 188 | struct netdev *ret, *tmpdev; |
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| 189 | struct dirent **cfgs; |
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| 190 | int x; |
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| 191 | |
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| 192 | ret = NULL; |
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| 193 | |
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| 194 | if ((ncfgs = scandir("/etc/sysconfig/network-scripts",&cfgs, |
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| 195 | isCfg, alphasort)) == -1) { |
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| 196 | return ret; |
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| 197 | } |
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| 198 | for (x = 0; x < ncfgs; x++ ) { |
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| 199 | char *path; |
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| 200 | char *devname, *hwaddr; |
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| 201 | gchar *contents, **lines; |
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| 202 | int i; |
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| 203 | |
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| 204 | devname = hwaddr = contents = NULL; |
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| 205 | lines = NULL; |
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| 206 | if (asprintf(&path,"/etc/sysconfig/network-scripts/%s", |
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| 207 | cfgs[x]->d_name) == -1) |
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| 208 | continue; |
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| 209 | g_file_get_contents(path, &contents, NULL, NULL); |
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| 210 | if (!contents) |
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| 211 | continue; |
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| 212 | lines = g_strsplit(contents,"\n", 0); |
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| 213 | for (i = 0; lines[i]; i++) { |
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| 214 | if (g_str_has_prefix(lines[i],"DEVICE=")) { |
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| 215 | devname = lines[i] + 7; |
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| 216 | /* ignore alias devices */ |
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| 217 | if (strchr(devname,':')) |
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| 218 | devname = NULL; |
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| 219 | } |
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| 220 | #if defined(__s390__) || defined(__s390x__) |
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| 221 | if (g_str_has_prefix(lines[i],"SUBCHANNELS=")) { |
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| 222 | hwaddr = dequote(lines[i] + 12, NULL); |
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| 223 | } |
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| 224 | #else |
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| 225 | if (g_str_has_prefix(lines[i],"HWADDR=")) { |
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| 226 | hwaddr = dequote(lines[i] + 7, NULL); |
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| 227 | } |
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| 228 | #endif |
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| 229 | } |
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| 230 | if (!devname || !hwaddr) { |
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| 231 | g_free(contents); |
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| 232 | g_strfreev(lines); |
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| 233 | continue; |
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| 234 | } |
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| 235 | tmpdev = calloc(1, sizeof(struct netdev)); |
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| 236 | tmpdev->dev = g_strstrip(g_strdup(devname)); |
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| 237 | tmpdev->hwaddr = g_strstrip(g_strdup(hwaddr)); |
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| 238 | if (ret) |
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| 239 | tmpdev->next = ret; |
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| 240 | ret = tmpdev; |
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| 241 | g_free(contents); |
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| 242 | g_strfreev(lines); |
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| 243 | } |
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| 244 | free(cfgs); |
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| 245 | return ret; |
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| 246 | } |
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| 247 | |
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| 248 | char *get_hwaddr(char *device) { |
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| 249 | struct netdev *dev; |
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| 250 | |
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| 251 | for (dev = devs; dev; dev = dev->next) |
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| 252 | if (!strcmp(dev->dev, device)) |
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| 253 | return dev->hwaddr; |
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| 254 | return NULL; |
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| 255 | } |
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| 256 | |
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| 257 | char *get_config_by_hwaddr(char *hwaddr, char *current) { |
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| 258 | struct netdev *config; |
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| 259 | char *first = NULL; |
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| 260 | |
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| 261 | if (!hwaddr) return NULL; |
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| 262 | |
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| 263 | for (config = configs; config; config = config->next) { |
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| 264 | if (strcasecmp(config->hwaddr, hwaddr) != 0) |
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| 265 | continue; |
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| 266 | if (!current || !strcasecmp(config->dev, current)) |
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| 267 | return config->dev; |
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| 268 | if (!first) |
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| 269 | first = config->dev; |
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| 270 | } |
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| 271 | return first; |
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| 272 | } |
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| 273 | |
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| 274 | char *get_device_by_hwaddr(char *hwaddr) { |
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| 275 | struct netdev *dev; |
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| 276 | |
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| 277 | if (!hwaddr) return NULL; |
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| 278 | |
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| 279 | for (dev = devs; dev; dev = dev->next) |
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| 280 | if (!strcasecmp(dev->hwaddr, hwaddr)) |
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| 281 | return dev->dev; |
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| 282 | return NULL; |
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| 283 | } |
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| 284 | |
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| 285 | void take_lock() { |
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| 286 | int count = 0; |
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| 287 | int lockfd; |
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| 288 | |
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| 289 | while (1) { |
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| 290 | lockfd = open(LOCKFILE, O_RDWR|O_CREAT|O_EXCL, 0644); |
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| 291 | if (lockfd != -1) { |
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| 292 | write(lockfd,"%d\n",getpid()); |
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| 293 | close(lockfd); |
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| 294 | break; |
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| 295 | } |
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| 296 | count++; |
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| 297 | /* If we've slept for 20 seconds, break the lock. */ |
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| 298 | if (count >= 200) { |
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| 299 | int fd; |
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| 300 | char buf[32]; |
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| 301 | int pid; |
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| 302 | |
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| 303 | fd = open(LOCKFILE, O_RDONLY); |
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| 304 | if (fd == -1) |
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| 305 | break; |
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| 306 | read(fd,buf,32); |
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| 307 | close(fd); |
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| 308 | pid = atoi(buf); |
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| 309 | if (pid && pid != 1) { |
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| 310 | kill(pid,SIGKILL); |
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| 311 | } |
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| 312 | } |
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| 313 | usleep(100000); |
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| 314 | continue; |
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| 315 | |
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| 316 | } |
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| 317 | return; |
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| 318 | } |
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| 319 | |
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| 320 | int main(int argc, char **argv) { |
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| 321 | char *src, *target, *hw; |
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| 322 | struct timeval tv; |
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| 323 | |
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| 324 | gettimeofday(&tv, NULL); |
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| 325 | srand(tv.tv_usec); |
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| 326 | take_lock(); |
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| 327 | |
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| 328 | signal(SIGSEGV,sighandler); |
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| 329 | signal(SIGKILL,sighandler); |
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| 330 | signal(SIGTERM,sighandler); |
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| 331 | signal(SIGSEGV,sighandler); |
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| 332 | signal(SIGALRM,sighandler); |
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| 333 | alarm(10); |
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| 334 | |
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| 335 | configs = get_configs(); |
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| 336 | devs = get_devs(); |
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| 337 | |
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| 338 | src = getenv("INTERFACE"); |
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| 339 | if (!src) |
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| 340 | goto out_unlock; |
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| 341 | hw = get_hwaddr(src); |
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| 342 | if (!hw) |
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| 343 | goto out_unlock; |
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| 344 | target = get_config_by_hwaddr(hw, src); |
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| 345 | if (!target) |
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| 346 | goto out_unlock; |
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| 347 | |
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| 348 | printf("%s", target); |
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| 349 | |
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| 350 | out_unlock: |
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| 351 | unlink(LOCKFILE); |
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| 352 | exit(0); |
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| 353 | } |
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