utils.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include "utils.h"
  17
  18 #include <arpa/inet.h>
  19 #include <netinet/in.h>
  20 #include <sys/socket.h>
  21
  22 #ifdef __APPLE__
  23 #include <libproc.h>
  24 #endif
  25
  26 void
  27 __vlist_simple_init(struct vlist_simple_tree *tree, int offset)
  28 {
  29         INIT_LIST_HEAD(&tree->list);
  30         tree->version = 1;
  31         tree->head_offset = offset;
  32 }
  33
  34 void
  35 vlist_simple_delete(struct vlist_simple_tree *tree, struct vlist_simple_node *node)
  36 {
  37         char *ptr;
  38
  39         list_del(&node->list);
  40         ptr = (char *) node - tree->head_offset;
  41         free(ptr);
  42 }
  43
  44 void
  45 vlist_simple_flush(struct vlist_simple_tree *tree)
  46 {
  47         struct vlist_simple_node *n, *tmp;
  48
  49         list_for_each_entry_safe(n, tmp, &tree->list, list) {
  50                 if ((n->version == tree->version || n->version == -1) &&
  51                     tree->version != -1)
  52                         continue;
  53
  54                 vlist_simple_delete(tree, n);
  55         }
  56 }
  57
  58 void
  59 vlist_simple_replace(struct vlist_simple_tree *dest, struct vlist_simple_tree *old)
  60 {
  61         struct vlist_simple_node *n, *tmp;
  62
  63         vlist_simple_update(dest);
  64         list_for_each_entry_safe(n, tmp, &old->list, list) {
  65                 list_del(&n->list);
  66                 vlist_simple_add(dest, n);
  67         }
  68         vlist_simple_flush(dest);
  69 }
  70
  71 void
  72 vlist_simple_flush_all(struct vlist_simple_tree *tree)
  73 {
  74         tree->version = -1;
  75         vlist_simple_flush(tree);
  76 }
  77
  78 unsigned int
  79 parse_netmask_string(const char *str, bool v6)
  80 {
  81         struct in_addr addr;
  82         unsigned int ret;
  83         char *err = NULL;
  84
  85         if (!strchr(str, '.')) {
  86                 ret = strtoul(str, &err, 0);
  87                 if (err && *err)
  88                         goto error;
  89
  90                 return ret;
  91         }
  92
  93         if (v6)
  94                 goto error;
  95
  96         if (inet_aton(str, &addr) != 1)
  97                 goto error;
  98
  99         return 32 - fls(~(ntohl(addr.s_addr)));
 100
 101 error:
 102         return ~0;
 103 }
 104
 105 bool
 106 split_netmask(char *str, unsigned int *netmask, bool v6)
 107 {
 108         char *delim = strchr(str, '/');
 109
 110         if (delim) {
 111                 *(delim++) = 0;
 112
 113                 *netmask = parse_netmask_string(delim, v6);
 114         }
 115         return true;
 116 }
 117
 118 int
 119 parse_ip_and_netmask(int af, const char *str, void *addr, unsigned int *netmask)
 120 {
 121         char *astr = alloca(strlen(str) + 1);
 122         int ret = 0;
 123
 124         strcpy(astr, str);
 125         if (!split_netmask(astr, netmask, af == AF_INET6))
 126                 return 0;
 127
 128         if (af == AF_INET6) {
 129                 if (*netmask > 128)
 130                         return 0;
 131         } else {
 132                 if (*netmask > 32)
 133                         return 0;
 134         }
 135
 136         ret = inet_pton(af, astr, addr);
 137         if (ret > 0) {
 138                 if (af == AF_INET) {
 139                         struct in_addr *ip4_addr = (struct in_addr *)addr;
 140                         uint32_t host_addr = ntohl(ip4_addr->s_addr);
 141
 142                         if (IN_EXPERIMENTAL(host_addr)) {
 143                                 return 0;
 144                         }
 145                 }
 146                 else if (af == AF_INET6) {
 147                         if (IN6_IS_ADDR_MULTICAST((struct in6_addr *)addr)) {
 148                                 return 0;
 149                         }
 150                 }
 151         }
 152         return ret;
 153 }
 154
 155 char *
 156 format_macaddr(uint8_t *mac)
 157 {
 158         static char str[sizeof("ff:ff:ff:ff:ff:ff ")];
 159
 160         snprintf(str, sizeof(str), "%02x:%02x:%02x:%02x:%02x:%02x",
 161                  mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
 162
 163         return str;
 164 }
 165
 166 uint32_t
 167 crc32_file(FILE *fp)
 168 {
 169         static uint32_t *crcvals = NULL;
 170         if (!crcvals) {
 171                 crcvals = malloc(sizeof(*crcvals) * 256);
 172
 173                 for (size_t i = 0; i < 256; ++i) {
 174                         uint32_t c = i;
 175                         for (size_t j = 0; j < 8; ++j)
 176                                 c = (c & 1) ? (0xEDB88320 ^ (c >> 1)) : (c >> 1);
 177                         crcvals[i] = c;
 178                 }
 179         }
 180
 181         uint8_t buf[1024];
 182         size_t len;
 183         uint32_t c = 0xFFFFFFFF;
 184
 185         do {
 186                 len = fread(buf, 1, sizeof(buf), fp);
 187                 for (size_t i = 0; i < len; ++i)
 188                         c = crcvals[(c ^ buf[i]) & 0xFF] ^ (c >> 8);
 189         } while (len == sizeof(buf));
 190
 191         return c ^ 0xFFFFFFFF;
 192 }
 193
 194 bool check_pid_path(int pid, const char *exe)
 195 {
 196         int proc_exe_len;
 197         int exe_len = strlen(exe);
 198
 199 #ifdef __APPLE__
 200         char proc_exe_buf[PROC_PIDPATHINFO_SIZE];
 201
 202         proc_exe_len = proc_pidpath(pid, proc_exe_buf, sizeof(proc_exe_buf));
 203 #else
 204         char proc_exe[32];
 205         char *proc_exe_buf = alloca(exe_len);
 206
 207         sprintf(proc_exe, "/proc/%d/exe", pid);
 208         proc_exe_len = readlink(proc_exe, proc_exe_buf, exe_len);
 209 #endif
 210
 211         if (proc_exe_len != exe_len)
 212                 return false;
 213
 214         return !memcmp(exe, proc_exe_buf, exe_len);
 215 }
 216
 217 static const char * const uci_validate_name[__BLOBMSG_TYPE_LAST] = {
 218         [BLOBMSG_TYPE_STRING] = "string",
 219         [BLOBMSG_TYPE_ARRAY] = "list(string)",
 220         [BLOBMSG_TYPE_INT32] = "uinteger",
 221         [BLOBMSG_TYPE_BOOL] = "bool",
 222 };
 223
 224 const char*
 225 uci_get_validate_string(const struct uci_blob_param_list *p, int i)
 226 {
 227         if (p->validate[i])
 228                 return p->validate[i];
 229
 230         else if (uci_validate_name[p->params[i].type])
 231                 return uci_validate_name[p->params[i].type];
 232
 233         return p->validate[BLOBMSG_TYPE_STRING];
 234 }