Created
March 6, 2012 12:21
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Packet capture
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| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <string.h> | |
| #include <unistd.h> | |
| #include <sys/types.h> | |
| #include <sys/socket.h> | |
| #include <sys/ioctl.h> | |
| #include <net/if.h> | |
| #include <netinet/in.h> | |
| #include <netpacket/packet.h> | |
| #include <net/ethernet.h> | |
| int main(int argc, char **argv) | |
| { | |
| int sockfd; | |
| struct ifreq if_info; | |
| int ifindex; | |
| struct sockaddr_ll lladdr = { 0 }; | |
| int i; | |
| char packetbuf[1500]; | |
| memset(&if_info, 0, sizeof(if_info)); | |
| if (argc < 2) | |
| { | |
| fprintf(stderr, "Usage: %s if-name\n", argv[0]); | |
| return 1; | |
| } | |
| sockfd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL)); | |
| if (sockfd < 0) | |
| { | |
| perror("socket() failed"); | |
| return 1; | |
| } | |
| strncpy(if_info.ifr_name, argv[1], IFNAMSIZ); | |
| if (ioctl(sockfd, SIOCGIFINDEX, &if_info)) | |
| { | |
| perror("ioctl(SIOCGIFINDEX) failed"); | |
| close(sockfd); | |
| return 1; | |
| } | |
| ifindex = if_info.ifr_ifindex; | |
| printf("%s index = %d\n", if_info.ifr_name, ifindex); | |
| lladdr.sll_family = AF_PACKET; | |
| lladdr.sll_ifindex = ifindex; | |
| if (bind(sockfd, (struct sockaddr*)&lladdr, sizeof(lladdr))) | |
| { | |
| perror("bind() failed"); | |
| close(sockfd); | |
| return 0; | |
| } | |
| for (i = 0; i < 10; ++i) | |
| { | |
| ssize_t bytes_read = read(sockfd, packetbuf, sizeof(packetbuf)); | |
| if (bytes_read < 0) | |
| { | |
| perror("read() failed"); | |
| break; | |
| } | |
| printf("Receieved packet len = %d\n", (int)bytes_read); | |
| } | |
| close(sockfd); | |
| return 0; | |
| } |
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