?? udptalk.c
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#include <sys/types.h>#include <sys/socket.h>#include <arpa/inet.h>#include <stdio.h>#define BUFLEN 255int main(int argc, char **argv){ struct sockaddr_in peeraddr, localaddr; int sockfd; char recmsg[BUFLEN+1]; int socklen, n; if(argc!=5){ printf("%s <dest IP address> <dest port> <source IP address> <source port>\n", argv[0]); exit(0); } sockfd = socket(AF_INET, SOCK_DGRAM, 0); if(sockfd<0){ printf("socket creating err in udptalk\n"); exit(1); } socklen = sizeof(struct sockaddr_in); memset(&peeraddr, 0, socklen); peeraddr.sin_family=AF_INET; peeraddr.sin_port=htons(atoi(argv[2])); if(inet_pton(AF_INET, argv[1], &peeraddr.sin_addr)<=0){ printf("Wrong dest IP address!\n"); exit(0); } memset(&localaddr, 0, socklen); localaddr.sin_family=AF_INET; if(inet_pton(AF_INET, argv[3], &localaddr.sin_addr)<=0){ printf("Wrong source IP address!\n"); exit(0); } localaddr.sin_port=htons(atoi(argv[4])); if(bind(sockfd, &localaddr, socklen)<0){ printf("bind local address err in udptalk!\n"); exit(2); } if(fgets(recmsg, BUFLEN, stdin) == NULL) exit(0); if(sendto(sockfd, recmsg, strlen(recmsg), 0, &peeraddr, socklen)<0){ printf("sendto err in udptalk!\n"); exit(3); } for(;;){ /*recv&send message loop*/ n = recvfrom(sockfd, recmsg, BUFLEN, 0, &peeraddr, &socklen); if(n<0){ printf("recvfrom err in udptalk!\n"); exit(4); }else{ recmsg[n]=0; printf("peer:%s", recmsg); } if(fgets(recmsg, BUFLEN, stdin) == NULL) exit(0); if(sendto(sockfd, recmsg, strlen(recmsg), 0, &peeraddr, socklen)<0){ printf("sendto err in udptalk!\n"); exit(3); } }}?? 快捷鍵說明
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