121 lines
2.7 KiB
C
121 lines
2.7 KiB
C
/* $Id: listifaces.c,v 1.7 2015/02/08 08:51:54 nanard Exp $ */
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/* (c) 2006-2015 Thomas BERNARD
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* http://miniupnp.free.fr/ http://miniupnp.tuxfamily.org/
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "upnputils.h"
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/* hexdump */
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void printhex(const unsigned char * p, int n)
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{
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int i;
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while(n>0)
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{
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for(i=0; i<16; i++)
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printf("%02x ", p[i]);
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printf("| ");
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for(i=0; i<16; i++)
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{
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putchar((p[i]>=32 && p[i]<127)?p[i]:'.');
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}
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printf("\n");
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p+=16;
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n -= 16;
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}
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}
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/* List network interfaces */
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void listifaces(void)
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{
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struct ifconf ifc;
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char * buf = NULL;
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int buflen;
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int s, i;
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int j;
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char saddr[256/*INET_ADDRSTRLEN*/];
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#ifdef __linux__
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buflen = sizeof(struct ifreq)*10;
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#else
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buflen = 0;
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#endif
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/*s = socket(PF_INET, SOCK_DGRAM, 0);*/
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s = socket(AF_INET, SOCK_DGRAM, 0);
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do {
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char * tmp;
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#ifdef __linux__
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buflen += buflen;
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#endif
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if(buflen > 0) {
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tmp = realloc(buf, buflen);
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if(!tmp) {
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fprintf(stderr, "error allocating %d bytes.\n", buflen);
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close(f);
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free(buf);
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return;
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}
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buf = tmp;
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}
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ifc.ifc_len = buflen;
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ifc.ifc_buf = (caddr_t)buf;
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if(ioctl(s, SIOCGIFCONF, &ifc) < 0)
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{
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perror("ioctl");
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close(s);
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free(buf);
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return;
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}
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printf("buffer length=%d - buffer used=%d - sizeof(struct ifreq)=%d\n",
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buflen, ifc.ifc_len, (int)sizeof(struct ifreq));
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printf("IFNAMSIZ=%d ", IFNAMSIZ);
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printf("sizeof(struct sockaddr)=%d sizeof(struct sockaddr_in)=%d\n",
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(int)sizeof(struct sockaddr), (int)sizeof(struct sockaddr_in) );
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#ifndef __linux__
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if(buflen == 0)
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buflen = ifc.ifc_len;
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else
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break;
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} while(1);
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#else
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} while(buflen <= ifc.ifc_len);
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#endif
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printhex((const unsigned char *)ifc.ifc_buf, ifc.ifc_len);
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printf("off index fam name address\n");
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for(i = 0, j = 0; i<ifc.ifc_len; j++)
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{
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/*const struct ifreq * ifrp = &(ifc.ifc_req[j]);*/
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const struct ifreq * ifrp = (const struct ifreq *)(buf + i);
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/*inet_ntop(AF_INET, &(((struct sockaddr_in *)&(ifrp->ifr_addr))->sin_addr), saddr, sizeof(saddr));*/
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saddr[0] = '\0';
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/* inet_ntop(ifrp->ifr_addr.sa_family, &(ifrp->ifr_addr.sa_data[2]), saddr, sizeof(saddr)); */
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sockaddr_to_string(&ifrp->ifr_addr, saddr, sizeof(saddr));
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printf("0x%03x %2d %2d %-16s %s\n", i, j, ifrp->ifr_addr.sa_family, ifrp->ifr_name, saddr);
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/*ifrp->ifr_addr.sa_len is only available on BSD */
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#ifdef __linux__
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i += sizeof(struct ifreq);
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#else
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if(ifrp->ifr_addr.sa_len == 0)
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break;
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i += IFNAMSIZ + ifrp->ifr_addr.sa_len;
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#endif
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}
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free(buf);
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close(s);
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}
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int main(int argc, char * * argv)
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{
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(void)argc;
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(void)argv;
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listifaces();
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return 0;
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}
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