Linux中使用TCPDUMP进行简单的TCP抓包

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/** * @FileName server_socket.c * @Describe A simple example for creating a listen as a server in linux system. * @Author vfhky 2015-09-25 21:32 https://typecodes.com/linux/simpletcpdumpapply.html * @Compile gcc server_socket.c -o server_socket */ #include <stdio.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <errno.h> int main( int argc, char **argv ) { int server_sockfd; int client_sockfd; int len; int llOpt = 1; struct sockaddr_in my_addr; struct sockaddr_in remote_addr; int sin_size; char bufBUFSIZ; memset( &my_addr, 0, sizeof(my_addr) ); my_addr.sin_family = AF_INET; my_addr.sin_addr.s_addr = INADDR_ANY; my_addr.sin_port = htons(8000); if( ( server_sockfd = socket( AF_INET, SOCK_STREAM, 0 ) ) < 0 ) { perror("socket"); return 1; } if( setsockopt( server_sockfd, SOL_SOCKET, SO_REUSEADDR, &llOpt, sizeof(llOpt) ) ) { close(server_sockfd); return errno; } if( bind( server_sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr) ) < 0 ) { perror( "bind" ); return 1; } listen( server_sockfd, 5 ); sin_size = sizeof( struct sockaddr_in ); printf( "Socket server begin to recieve connectiong from client.\n" ); while(1) { if( ( client_sockfd = accept( server_sockfd, (struct sockaddr *)&remote_addr, &sin_size ) ) < 0 ) { perror( "accept" ); return 1; } printf( "Accept client%s.\n", inet_ntoa(remote_addr.sin_addr) ); memset( buf, 0x00, BUFSIZ ); while( ( len = recv( client_sockfd ,buf, BUFSIZ, 0) ) > 0 ) { buflen='\0'; printf( "Message from client=%s\n", buf ); } close( client_sockfd ); } close( server_sockfd ); return 0; }