35 lines
620 B
C
35 lines
620 B
C
#include <stdio.h>
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#include <unistd.h>
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#include <string.h> /* for strncpy */
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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 <netinet/in.h>
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#include <net/if.h>
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#include <arpa/inet.h>
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int
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main()
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{
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int fd;
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struct ifreq ifr;
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fd = socket(AF_INET, SOCK_DGRAM, 0);
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/* I want to get an IPv4 IP address */
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ifr.ifr_addr.sa_family = AF_INET;
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/* I want IP address attached to "eth0" */
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strncpy(ifr.ifr_name, "eth0", IFNAMSIZ-1);
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ioctl(fd, SIOCGIFADDR, &ifr);
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close(fd);
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/* display result */
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printf("%s\n", inet_ntoa(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr));
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return 0;
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}
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