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Sources/netifd/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 
123         strcpy(astr, str);
124         if (!split_netmask(astr, netmask, af == AF_INET6))
125                 return 0;
126 
127         if (af == AF_INET6) {
128                 if (*netmask > 128)
129                         return 0;
130         } else {
131                 if (*netmask > 32)
132                         return 0;
133         }
134 
135         return inet_pton(af, astr, addr);
136 }
137 
138 char *
139 format_macaddr(uint8_t *mac)
140 {
141         static char str[sizeof("ff:ff:ff:ff:ff:ff ")];
142 
143         snprintf(str, sizeof(str), "%02x:%02x:%02x:%02x:%02x:%02x",
144                  mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
145 
146         return str;
147 }
148 
149 uint32_t
150 crc32_file(FILE *fp)
151 {
152         static uint32_t *crcvals = NULL;
153         if (!crcvals) {
154                 crcvals = malloc(sizeof(*crcvals) * 256);
155 
156                 for (size_t i = 0; i < 256; ++i) {
157                         uint32_t c = i;
158                         for (size_t j = 0; j < 8; ++j)
159                                 c = (c & 1) ? (0xEDB88320 ^ (c >> 1)) : (c >> 1);
160                         crcvals[i] = c;
161                 }
162         }
163 
164         uint8_t buf[1024];
165         size_t len;
166         uint32_t c = 0xFFFFFFFF;
167 
168         do {
169                 len = fread(buf, 1, sizeof(buf), fp);
170                 for (size_t i = 0; i < len; ++i)
171                         c = crcvals[(c ^ buf[i]) & 0xFF] ^ (c >> 8);
172         } while (len == sizeof(buf));
173 
174         return c ^ 0xFFFFFFFF;
175 }
176 
177 bool check_pid_path(int pid, const char *exe)
178 {
179         int proc_exe_len;
180         int exe_len = strlen(exe);
181 
182 #ifdef __APPLE__
183         char proc_exe_buf[PROC_PIDPATHINFO_SIZE];
184 
185         proc_exe_len = proc_pidpath(pid, proc_exe_buf, sizeof(proc_exe_buf));
186 #else
187         char proc_exe[32];
188         char *proc_exe_buf = alloca(exe_len);
189 
190         sprintf(proc_exe, "/proc/%d/exe", pid);
191         proc_exe_len = readlink(proc_exe, proc_exe_buf, exe_len);
192 #endif
193 
194         if (proc_exe_len != exe_len)
195                 return false;
196 
197         return !memcmp(exe, proc_exe_buf, exe_len);
198 }
199 
200 static const char * const uci_validate_name[__BLOBMSG_TYPE_LAST] = {
201         [BLOBMSG_TYPE_STRING] = "string",
202         [BLOBMSG_TYPE_ARRAY] = "list(string)",
203         [BLOBMSG_TYPE_INT32] = "uinteger",
204         [BLOBMSG_TYPE_BOOL] = "bool",
205 };
206 
207 const char*
208 uci_get_validate_string(const struct uci_blob_param_list *p, int i)
209 {
210         if (p->validate[i])
211                 return p->validate[i];
212 
213         else if (uci_validate_name[p->params[i].type])
214                 return uci_validate_name[p->params[i].type];
215 
216         return p->validate[BLOBMSG_TYPE_STRING];
217 }
218 

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