/*
    * netifd - network interface daemon
    * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
    *
    * This program is free software; you can redistribute it and/or modify
    * it under the terms of the GNU General Public License version 2
    * as published by the Free Software Foundation
    *
    * 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.
   */
  #include <string.h>
  #include <stdlib.h>
  
  #include <arpa/inet.h>
  #include <netinet/in.h>
  #include <sys/socket.h>
  
  #ifdef __APPLE__
  #include <libproc.h>
  #endif
  
  #include "utils.h"
  
  void
  __vlist_simple_init(struct vlist_simple_tree *tree, int offset)
  {
          INIT_LIST_HEAD(&tree->list);
          tree->version = 1;
          tree->head_offset = offset;
  }
  
  void
  vlist_simple_delete(struct vlist_simple_tree *tree, struct vlist_simple_node *node)
  {
          char *ptr;
  
          list_del(&node->list);
          ptr = (char *) node - tree->head_offset;
          free(ptr);
  }
  
  void
  vlist_simple_flush(struct vlist_simple_tree *tree)
  {
          struct vlist_simple_node *n, *tmp;
  
          list_for_each_entry_safe(n, tmp, &tree->list, list) {
                  if ((n->version == tree->version || n->version == -1) &&
                      tree->version != -1)
                          continue;
  
                  vlist_simple_delete(tree, n);
          }
  }
  
  void
  vlist_simple_replace(struct vlist_simple_tree *dest, struct vlist_simple_tree *old)
  {
          struct vlist_simple_node *n, *tmp;
  
          vlist_simple_update(dest);
          list_for_each_entry_safe(n, tmp, &old->list, list) {
                  list_del(&n->list);
                  vlist_simple_add(dest, n);
          }
          vlist_simple_flush(dest);
  }
  
  void
  vlist_simple_flush_all(struct vlist_simple_tree *tree)
  {
          tree->version = -1;
          vlist_simple_flush(tree);
  }
  
  unsigned int
  parse_netmask_string(const char *str, bool v6)
  {
          struct in_addr addr;
          unsigned int ret;
          char *err = NULL;
  
          if (!strchr(str, '.')) {
                  ret = strtoul(str, &err, 0);
                  if (err && *err)
                          goto error;
  
                  return ret;
          }
  
          if (v6)
                  goto error;
  
          if (inet_aton(str, &addr) != 1)
                  goto error;
  
         return 32 - fls(~(ntohl(addr.s_addr)));
 
 error:
         return ~0;
 }
 
 bool
 split_netmask(char *str, unsigned int *netmask, bool v6)
 {
         char *delim = strchr(str, '/');
 
         if (delim) {
                 *(delim++) = 0;
 
                 *netmask = parse_netmask_string(delim, v6);
         }
         return true;
 }
 
 int
 parse_ip_and_netmask(int af, const char *str, void *addr, unsigned int *netmask)
 {
         char *astr = alloca(strlen(str) + 1);
 
         strcpy(astr, str);
         if (!split_netmask(astr, netmask, af == AF_INET6))
                 return 0;
 
         if (af == AF_INET6) {
                 if (*netmask > 128)
                         return 0;
         } else {
                 if (*netmask > 32)
                         return 0;
         }
 
         return inet_pton(af, astr, addr);
 }
 
 char *
 format_macaddr(uint8_t *mac)
 {
         static char str[sizeof("ff:ff:ff:ff:ff:ff ")];
 
         snprintf(str, sizeof(str), "%02x:%02x:%02x:%02x:%02x:%02x",
                  mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
 
         return str;
 }
 
 uint32_t
 crc32_file(FILE *fp)
 {
         static uint32_t *crcvals = NULL;
         if (!crcvals) {
                 crcvals = malloc(sizeof(*crcvals) * 256);
 
                 for (size_t i = 0; i < 256; ++i) {
                         uint32_t c = i;
                         for (size_t j = 0; j < 8; ++j)
                                 c = (c & 1) ? (0xEDB88320 ^ (c >> 1)) : (c >> 1);
                         crcvals[i] = c;
                 }
         }
 
         uint8_t buf[1024];
         size_t len;
         uint32_t c = 0xFFFFFFFF;
 
         do {
                 len = fread(buf, 1, sizeof(buf), fp);
                 for (size_t i = 0; i < len; ++i)
                         c = crcvals[(c ^ buf[i]) & 0xFF] ^ (c >> 8);
         } while (len == sizeof(buf));
 
         return c ^ 0xFFFFFFFF;
 }
 
 bool check_pid_path(int pid, const char *exe)
 {
         const char deleted[] = " (deleted)";
         const int deleted_len = strlen(deleted);
         int proc_exe_len;
         int exe_len = strlen(exe);
 
 #ifdef __APPLE__
         char proc_exe_buf[PROC_PIDPATHINFO_SIZE];
 
         proc_exe_len = proc_pidpath(pid, proc_exe_buf, sizeof(proc_exe_buf));
 #else
         char proc_exe[32];
         char *proc_exe_buf = alloca(exe_len);
 
         sprintf(proc_exe, "/proc/%d/exe", pid);
         proc_exe_len = readlink(proc_exe, proc_exe_buf, exe_len);
 #endif
 
         if (proc_exe_len == exe_len)
                 return !memcmp(exe, proc_exe_buf, exe_len);
         else if (proc_exe_len == exe_len + deleted_len)
                 return !memcmp(exe, proc_exe_buf, exe_len) &&
                         !memcmp(exe + exe_len, deleted, deleted_len);
         else
                 return false;
 }
 
 static const char * const uci_validate_name[__BLOBMSG_TYPE_LAST] = {
         [BLOBMSG_TYPE_STRING] = "string",
         [BLOBMSG_TYPE_ARRAY] = "list(string)",
         [BLOBMSG_TYPE_INT32] = "uinteger",
         [BLOBMSG_TYPE_BOOL] = "bool",
 };
 
 const char*
 uci_get_validate_string(const struct uci_blob_param_list *p, int i)
 {
         if (p->validate[i])
                 return p->validate[i];
 
         else if (uci_validate_name[p->params[i].type])
                 return uci_validate_name[p->params[i].type];
 
         return p->validate[BLOBMSG_TYPE_STRING];
 }
 

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