vlastni IP adresa
Pavel Janík
Pavel na Janik.cz
Sobota Květen 26 12:55:55 CEST 2001
From: "Miroslav Kubiczek" <miroslav.kubiczek na anfdata.cz>
Date: Thu, 24 May 2001 15:41:32 +0100
Zdravím,
> Poradi nekdo jak programove (v c-cku) zjistit vlastni IP adresu. Pripadne
> seznam vsech vlastnich IP adres?
/*
* short hack to grab interface information
* gcc -o gi gi.c; strip gi
*
* Blu3, Jan 1999
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define SIOCGIFCONF 0x8912 /* get iface list */
int main(int argc, char *argv[])
{
int numreqs = 30, sd, n, search, tick, found=0;
struct ifconf ifc;
struct ifreq *ifr;
struct in_addr *ia;
//
// if there is an arg on the command line, print out the ip of that device
// only. note the numreqs in the above, modify that as is desired.
search= (argc>1);
if(search && strlen(argv[1]) > 64) {
fprintf(stderr, "specified device name too large, ignoring\n");
search=0;
}
sd=socket(AF_INET, SOCK_STREAM, 0);
ifc.ifc_buf = NULL;
ifc.ifc_len = sizeof(struct ifreq) * numreqs;
ifc.ifc_buf = realloc(ifc.ifc_buf, ifc.ifc_len);
if (ioctl(sd, SIOCGIFCONF, &ifc) < 0) {
perror("SIOCGIFCONF");
}
ifr = ifc.ifc_req;
for (n = 0; n < ifc.ifc_len; n += sizeof(struct ifreq)) {
ia= (struct in_addr *) ((ifr->ifr_ifru.ifru_addr.sa_data)+2);
if(search)
tick= strcmp(ifr->ifr_ifrn.ifrn_name, argv[1]);
if(!search)
fprintf(stdout, "%6s %-15s\n", ifr->ifr_ifrn.ifrn_name, inet_ntoa(*ia));
if (search && (tick==0)) {
fprintf(stdout, "%s\n", inet_ntoa(*ia));
found=1;
}
ifr++;
}
free(ifc.ifc_buf);
fprintf(stderr, "exiting with %i\n", found);
exit(found);
}
--
Pavel Janík
printk(KERN_WARNING "Warning: defective CD-ROM (volume sequence
number). Enabling \"cruft\" mount option.\n");
-- 2.2.16 fs/isofs/inode.c
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