1 /* 2 * ll_addr.c 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Alexey Kuznetsov, <kuznet (at) ms2.inr.ac.ru> 10 */ 11 12 #include <stdio.h> 13 #include <stdlib.h> 14 #include <unistd.h> 15 #include <syslog.h> 16 #include <fcntl.h> 17 #include <sys/ioctl.h> 18 #include <sys/socket.h> 19 #include <sys/ioctl.h> 20 #include <netinet/in.h> 21 #include <arpa/inet.h> 22 #include <string.h> 23 24 #include <linux/netdevice.h> 25 #include <linux/if_arp.h> 26 #include <linux/sockios.h> 27 28 #include "rt_names.h" 29 #include "utils.h" 30 31 32 const char *ll_addr_n2a(const unsigned char *addr, int alen, int type, char *buf, int blen) 33 { 34 int i; 35 int l; 36 37 if (alen == 4 && 38 (type == ARPHRD_TUNNEL || type == ARPHRD_SIT || type == ARPHRD_IPGRE)) { 39 return inet_ntop(AF_INET, addr, buf, blen); 40 } 41 if (alen == 16 && type == ARPHRD_TUNNEL6) { 42 return inet_ntop(AF_INET6, addr, buf, blen); 43 } 44 l = 0; 45 for (i=0; i<alen; i++) { 46 if (i==0) { 47 snprintf(buf+l, blen, "%02x", addr[i]); 48 blen -= 2; 49 l += 2; 50 } else { 51 snprintf(buf+l, blen, ":%02x", addr[i]); 52 blen -= 3; 53 l += 3; 54 } 55 } 56 return buf; 57 } 58 59 /*NB: lladdr is char * (rather than u8 *) because sa_data is char * (1003.1g) */ 60 int ll_addr_a2n(char *lladdr, int len, const char *arg) 61 { 62 if (strchr(arg, '.')) { 63 inet_prefix pfx; 64 if (get_addr_1(&pfx, arg, AF_INET)) { 65 fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg); 66 return -1; 67 } 68 if (len < 4) 69 return -1; 70 memcpy(lladdr, pfx.data, 4); 71 return 4; 72 } else { 73 int i; 74 75 for (i=0; i<len; i++) { 76 int temp; 77 char *cp = strchr(arg, ':'); 78 if (cp) { 79 *cp = 0; 80 cp++; 81 } 82 if (sscanf(arg, "%x", &temp) != 1) { 83 fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg); 84 return -1; 85 } 86 if (temp < 0 || temp > 255) { 87 fprintf(stderr, "\"%s\" is invalid lladdr.\n", arg); 88 return -1; 89 } 90 lladdr[i] = temp; 91 if (!cp) 92 break; 93 arg = cp; 94 } 95 return i+1; 96 } 97 } 98
