45 lines
751 B
C
45 lines
751 B
C
/* File: ip.c
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* ----------
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*
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <unistd.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 <netinet/in.h>
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#include <arpa/inet.h>
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void GetIpFromDevice(uint8_t ip[4], const char DeviceName[])
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{
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int fd;
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struct ifreq ifr;
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assert(strlen(DeviceName) <= IFNAMSIZ);
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fd = socket(AF_INET, SOCK_DGRAM, 0);
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assert(fd>0);
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strncpy(ifr.ifr_name, DeviceName, IFNAMSIZ);
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ifr.ifr_addr.sa_family = AF_INET;
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if (ioctl(fd, SIOCGIFADDR, &ifr) == 0)
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{
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struct sockaddr_in *p = (void*) &(ifr.ifr_addr);
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memcpy(ip, &(p->sin_addr), 4);
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}
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else
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{
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// 查询不到IP时默认填零处理
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memset(ip, 0x00, 4);
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}
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close(fd);
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return;
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}
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