80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
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/* $Id: listifaces.c,v 1.4 2007/09/23 16:59:02 nanard Exp $ */
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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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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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void listifaces()
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{
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struct ifconf ifc;
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char * buf = 0;
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int buflen = sizeof(struct ifreq)*20;
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/*[sizeof(struct ifreq)*8];*/
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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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/*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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buflen += buflen;
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buf = realloc(buf, buflen);
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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("%d - %d - %d\n", buflen, ifc.ifc_len, (int)sizeof(struct ifreq));
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printf(" %d\n", IFNAMSIZ);
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printf(" %d %d\n", (int)sizeof(struct sockaddr), (int)sizeof(struct sockaddr_in) );
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} while(buflen == ifc.ifc_len);
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printhex((const unsigned char *)ifc.ifc_buf, ifc.ifc_len);
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j = 0;
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for(i=0; i<ifc.ifc_len; /*i += sizeof(struct ifreq)*/)
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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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i += sizeof(ifrp->ifr_name) + 16;//ifrp->ifr_addr.sa_len;
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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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printf("%2d %d %d %s %s\n", j, ifrp->ifr_addr.sa_family, -1/*ifrp->ifr_addr.sa_len*/, ifrp->ifr_name, saddr);
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j++;
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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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listifaces();
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return 0;
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}
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