tcpip实验报告

《TCP/IP》实验报告姓名：学号：学院：专业：班级：指导老师：2013年6月3日实验一熟悉Linux编程环境练习1：编写一个并发程序，利用fork函数创建五个进程，让每一个进程打印出可用来分辨不同进程的信息。

#include<stdio.h>#include<unistd.h>#include<sys/wait.h>int main(){int pid, i;i = 0;while(i < 5){i++;if((pid=fork()) == 0){printf("pid:%d\n",getpid());sleep(3);break;}waitpid(pid,(int*)0,0);printf("ppid:%d\n",getpid());}return 0;}运行结果:练习2：编写一个程序，利用execve函数改变进程执行的代码。

//execve.c#include<stdio.h>#include<stdlib.h>#include<unistd.h>int main(int argc,char *argv[]){char *newargv[] = {NULL,"you","me",NULL};char *newenviron[]={NULL};if(argc != 2){fprintf(stderr,"Usage:%s <file-to-exec>\n",argv[0]);exit(EXIT_FAILURE);}newargv[0] = argv[1];execve(argv[1],newargv,newenviron);perror("execve");exit(EXIT_FAILURE);}//myecho.c#include<stdio.h>#include<stdlib.h>#include<unistd.h>int main(int argc, char *argv[]){int i;for(i = 0; i < argc; i++)printf("argv[%d]:%s\n",i,argv[i]);return 0;}运行结果:实验二实现Echo服务客户端程序（UDP）代码：//client.c#include<sys/socket.h>#include<netinet/in.h>#include<netdb.h>#include<stdio.h>#include<stdlib.h>#include<unistd.h>#include<string.h>#include<sys/types.h>#include<sys/time.h>#include<errno.h>int readable_timeo(int fd, int sec){fd_set rset;struct timeval tv;FD_ZERO(&rset);FD_SET(fd,&rset);_sec = sec;_usec = 0;return (select(fd+1,&rset,NULL,NULL,&tv)); //使用select函数实现简单超时重传}int main(int argc, char **argv){int sockfd, len, res, i;struct sockaddr_in address;char *host;struct hostent *hostinfo;struct servent *servinfo;char buf[128], buf2[128];int nsec = 20;//timeout:20sstruct timeval tpstart,tpend;double timeuse;if(argc == 1)host = "localhost";elsehost = argv[1];hostinfo = gethostbyname(host);if(!hostinfo){fprintf(stderr,"no host:%s\n",host);exit(1);}servinfo = getservbyname("echo","udp");if(!servinfo){fprintf(stderr,"no echo server!\n");exit(1);}sockfd = socket(AF_INET,SOCK_DGRAM,0);address.sin_family = AF_INET;address.sin_port = servinfo->s_port;address.sin_addr = *(struct in_addr*)*hostinfo->h_addr_list;len = sizeof(address);while(fgets(buf,128,stdin) != NULL){for(i = 0; i < 2; i++) //juse one chance to resend{if(i == 1) //resend{printf("ReSend!!!\n");gettimeofday(&tpend,NULL);timeuse=1000000*(__sec)+__usec;timeuse/=1000000;printf("resend time is %lf s\n",timeuse);}gettimeofday(&tpstart,NULL);res = sendto(sockfd,buf,strlen(buf),0,(struct sockaddr*)&address,len);if(readable_timeo(sockfd,nsec) == 0){fprintf(stderr,"socket timeout\n");continue;}res = recvfrom(sockfd,buf2,128,0,(struct sockaddr*)&address,&len);buf2[res] = 0;fputs(buf2,stdout);break; //send successfully,quit!}}close(sockfd);exit(0);}实验三循环无连接服务器Echo的实现代码：//server.c#include<stdio.h>#include<unistd.h>#include<netinet/in.h>#include<arpa/inet.h>#include<sys/types.h>#include<stdlib.h>#include<signal.h>#include<string.h>#include<errno.h>#include<time.h>#define MAXLINE 128int sockfd, flag = 1;void close_action(int sig){printf("close the sockfd\n");close(sockfd);signal(SIGINT,SIG_DFL);flag = 0;}int main(){struct sockaddr_in sin,sin_cli;int type, res, opt;char mesg[MAXLINE], buf[MAXLINE];socklen_t len;struct sigaction act;struct tm *ptm;int y,m,d,h,n,s;long ts;//set the signal actionact.sa_handler = close_action;sigemptyset(&act.sa_mask);act.sa_flags = 0;memset(&sin,0,sizeof(sin));sin.sin_family = AF_INET;sin.sin_addr.s_addr = INADDR_ANY;sin.sin_port = htons(45454);sockfd = socket(AF_INET,SOCK_DGRAM,0);if(sockfd < 0){fprintf(stderr,"can't create socket %s \n",strerror(errno));exit(1);}if(bind(sockfd,(struct sockaddr*)&sin,sizeof(sin)) < 0){fprintf(stderr,"can't bind to %s port:%s\n",service,strerror(errno));exit(1);}len = sizeof(sin_cli);sigaction(SIGINT,&act,0); //Ctrl+C close the sockfdwhile(flag){printf("\n");res = recvfrom(sockfd,mesg,MAXLINE,0,(struct sockaddr*)&sin_cli,&len);mesg[res] = 0;ts = time(NULL);sprintf(buf,"%.24s\r\n",ctime(&ts));printf("%s\t",buf);printf("%s\t",inet_ntoa(sin_cli.sin_addr));sendto(sockfd,mesg,n,0,(struct sockaddr*)&sin_cli,len);}exit(0);}实验四循环的、面向连接服务器的实现//server.c#include<stdio.h>#include<stdlib.h>#include<unistd.h>#include<time.h>#include<sys/types.h>#include<sys/socket.h>#include<netinet/in.h>#include<arpa/inet.h>#include<string.h>#define MAXSIZE 30int main(){struct sockaddr_in servaddr,cliaddr;int clilen;int connfd, listenfd;char buf[MAXSIZE];time_t now;int seconds;struct tm *ptm;int y,m,d,h,n,s;long ts;listenfd = socket(AF_INET,SOCK_STREAM,0);bzero(&servaddr,sizeof(servaddr));servaddr.sin_family = AF_INET;servaddr.sin_port = htons(9734);servaddr.sin_addr.s_addr = htonl(INADDR_ANY);bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr));listen(listenfd,5);for(;;){clilen = sizeof(cliaddr);connfd = accept(listenfd,(struct sockaddr*)&cliaddr,&clilen);ts = time(NULL);sprintf(buf,"%.24s\r\n",ctime(&ts));write(connfd,buf,MAXSIZE);}exit(1);}//client.c#include<stdio.h>#include<stdlib.h>#include<unistd.h>#include<sys/types.h>#include<sys/socket.h>#include<netinet/in.h>#include<arpa/inet.h>#include<time.h>#include<string.h>#define MAXSIZE 30void str_daytime(int fd){char buf[MAXSIZE];int n;if((n = read(fd,buf,MAXSIZE)) <= 0){fprintf(stderr,"error");}buf[n] = 0;fputs(buf,stdout);}int main(int argc,char **argv){int sockfd;struct sockaddr_in servaddr;sockfd = socket(AF_INET,SOCK_STREAM,0);servaddr.sin_family = AF_INET;servaddr.sin_port = htons(9734);//Inet_pton(AF_INET,argv[1],&servaddr.sin_addr);servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");connect(sockfd,(struct sockaddr*)&servaddr,sizeof(servaddr));str_daytime(sockfd);exit(1);}实验五循环的、面向连接服务器的实现//server.c#include<stdio.h>#include<stdlib.h>#include<unistd.h>#include<time.h>#include<sys/types.h>#include<sys/socket.h>#include<netinet/in.h>#include<arpa/inet.h>#include<string.h>#define MAXSIZE 30int main(){struct sockaddr_in servaddr,cliaddr;int clilen,connfd, listenfd, childpidchar buf[MAXSIZE];time_t now;int seconds;struct tm *ptm;int y,m,d,h,n,s;long ts;listenfd = socket(AF_INET,SOCK_STREAM,0);bzero(&servaddr,sizeof(servaddr));servaddr.sin_family = AF_INET;servaddr.sin_port = htons(9734);servaddr.sin_addr.s_addr = htonl(INADDR_ANY);bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr));listen(listenfd,5);clilen = sizeof(cliaddr);for(;;){connfd = accept(listenfd,(struct sockaddr*)&cliaddr,&clilen);if((childpid = fork()) == 0){close(listenfd);ts = time(NULL);sprintf(buf,"%.24s\r\n",ctime(&ts));write(connfd,buf,MAXSIZE);}close(connfd);}exit(1);}//test.c#include<stdio.h>#include<unistd.h>#include<stdlib.h>int main(){int i;for(i = 0; i < 10; i++){system("./tcpcli");printf("\n");}exit(0);}实验六单进程并发服务代码：#include<stdio.h>#include<stdlib.h>#include<unistd.h>#include<arpa/inet.h>#include<netinet/in.h>#include<sys/socket.h>#include<sys/select.h>#include<strings.h>#include<string.h>#include<time.h>#define MAXLINE 128int main(){struct sockaddr_in servaddr,cliaddr;int clilen;int connfd, listenfd, sockfd;char buf[MAXLINE];int i, maxi, maxfd, seconds, nresult, res, nread,client[FD_SETSIZE];pid_t childpid;fd_set readfds,testfds;struct tm *ptm;int y,m,d,h,n,s;time_t ts;listenfd = socket(AF_INET,SOCK_STREAM,0);bzero(&servaddr,sizeof(servaddr));servaddr.sin_family = AF_INET;servaddr.sin_port = htons(9734);servaddr.sin_addr.s_addr = htonl(INADDR_ANY);bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr));listen(listenfd,10);maxfd = listenfd;maxi = -1;for(i = 0; i < FD_SETSIZE; i++)client[i] = -1;FD_ZERO(&readfds);FD_SET(listenfd,&readfds);for(;;){testfds = readfds;nresult = select(maxfd+1,&testfds,NULL,NULL,NULL);if(FD_ISSET(listenfd,&testfds)){clilen = sizeof(cliaddr);connfd = accept(listenfd,(struct sockaddr*)&cliaddr,&clilen);for(i = 0; i < FD_SETSIZE; i++)if(client[i] < 0){client[i] = connfd;break;}if(i == FD_SETSIZE)fprintf(stderr,"too many clients");FD_SET(connfd,&readfds);if(connfd > maxfd)maxfd = connfd;if(i > maxi)maxi = i;if(--nresult <= 0)continue;}for(i = 0; i <= maxi; i++){if((sockfd = client[i]) < 0)continue;if(FD_ISSET(sockfd,&testfds)){if((res = read(sockfd,buf,MAXLINE))== 0){close(sockfd);printf("connection closed by client\n");FD_CLR(sockfd,&readfds);client[i] = -1;}else if(res > 0){printf("supply service to client!\n");ts = time(NULL);sprintf(buf,"%.24s",ctime(&ts));write(sockfd,buf,strlen(buf));}elseprintf("error!!!!\n");if(--nresult <= 0){printf("no more readble descriptors\n");break;}}}}exit(1);}实验七并发的客户端//tcpcli.c#include<stdio.h>#include<unistd.h>#include<stdlib.h>#include "unp.h"int main(int argc,char **argv){int i, ccount, hcount = 0, fd, maxfd = 0, n, one, sockfd;fd_set afds;char ser_ip[FD_SETSIZE][20], buf[MAXLINE];struct sockaddr_in servaddr;struct servent *servinfo;servinfo = getservbyname("daytime","tcp");servaddr.sin_family = AF_INET;servaddr.sin_port = servinfo->s_port;for(i = 1; i < argc; ++i){sockfd = socket(AF_INET,SOCK_STREAM,0);if(strcmp(argv[i],"-c") == 0){if(++i < argc && (ccount = atoi(argv[i])))continue;err_quit("tcpcli [-c] [number] [ip] ");}Inet_pton(AF_INET,argv[i],&servaddr.sin_addr);fd = connect(sockfd,(SA*)&servaddr,sizeof(servaddr));if(ioctl(sockfd,FIONBIO,(char*)&one))err_quit("can't mark socket nonblocking:%s\n",strerror(errno));if(sockfd > maxfd)maxfd = sockfd;strcpy(ser_ip[sockfd],argv[i]);++hcount;FD_SET(sockfd,&afds);}n = select(maxfd+1,&afds,NULL,NULL,NULL);for(i = 0; i <= maxfd; i++){if(FD_ISSET(i,&afds)){if((n = read(i,buf,MAXLINE)) == 0){close(sockfd);FD_CLR(i,&afds);}elseprintf("%s\t%s\n",buf,ser_ip[i]);}}exit(0);}实验八多线程服务代码：#include<stdio.h>#include<stdlib.h>#include<unistd.h>#include<time.h>#include<sys/types.h>#include<sys/socket.h>#include<netinet/in.h>#include<arpa/inet.h>#include<string.h>#include<semaphore.h>#include<pthread.h>#define MAXSIZE 30struct share_thread{pthread_mutex_t work_mutex;int count;}shared;void *thread_func(void *arg){int connfd;char buf[MAXSIZE];struct tm *ptm;int y,m,d,h,n,s;long ts;connfd = *(int*)arg;ts = time(NULL);sprintf(buf,"%.24s\r\n",ctime(&ts));write(connfd,buf,MAXSIZE);pthread_mutex_lock(&shared.work_mutex);shared.count++;pthread_mutex_unlock(&shared.work_mutex);printf("Number of service of daytime:%d\n",shared.count);close(connfd);pthread_exit(0);}int main(){struct sockaddr_in servaddr, cliaddr;int listenfd, connfd;pthread_t serv_thread;pthread_attr_t thread_attr;int res;int clilen;shared.count = 0;res = pthread_mutex_init(&shared.work_mutex,NULL);if(res != 0){fprintf(stderr,"mutex initilization failed");exit(1);}res = pthread_attr_init(&thread_attr);if(res != 0){fprintf(stderr,"Attribute creation failed");exit(1);}res = pthread_attr_setdetachstate(&thread_attr,PTHREAD_CREATE_DETACHED);if(res != 0){fprintf(stderr,"Setting detached attribute failed");exit(1);}listenfd = socket(AF_INET,SOCK_STREAM,0);bzero(&servaddr,sizeof(servaddr));servaddr.sin_family = AF_INET;servaddr.sin_port = htons(9734);servaddr.sin_addr.s_addr = htonl(INADDR_ANY);bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr));listen(listenfd,5);for(;;){clilen = sizeof(cliaddr);connfd = accept(listenfd,(struct sockaddr*)&cliaddr,&clilen);//wrongres = pthread_create(&serv_thread,&thread_attr,thread_func,(void*)&connfd);if(res != 0){fprintf(stderr,"create pthread failed\n");exit(1);}}exit(1);}实验九预分配进程服务器代码：//server.c#include<stdio.h>#include<stdlib.h>#include<unistd.h>#include<time.h>#include<sys/types.h>#include<sys/socket.h>#include<netinet/in.h>#include<arpa/inet.h>#include<string.h>#include<signal.h>#include<errno.h>#include<sys/wait.h>#include<pthread.h>#include<semaphore.h>#define MAXSIZE 30#define MAXCHILD 100static pthread_mutex_t work_mutex;static pid_t childpid[MAXCHILD];void child_main(int i, int listenfd){char buf[MAXSIZE];struct tm *ptm;int y,m,d,h,n,s;long ts;int connfd;int clilen;struct sockaddr_in cliaddr;clilen = sizeof(cliaddr);pthread_mutex_lock(&work_mutex); //lockconnfd = accept(listenfd,(struct sockaddr*)&cliaddr,&clilen);pthread_mutex_unlock(&work_mutex); //unlockprintf("Now, it is the %d child to supply service for the client\n",i);ts = time(NULL);sprintf(buf,"%.24s\r\n",ctime(&ts));write(connfd,buf,MAXSIZE);close(connfd);}void sig_int(int signo){printf("\ndestroy the mutex\n");int i;for(i = 0; i < MAXCHILD; i++)kill(childpid[i],SIGTERM);while(wait(NULL) > 0);if(errno != ECHILD)fprintf(stderr,"wait error");pthread_mutex_destroy(&work_mutex);exit(0);}int main(){struct sockaddr_in servaddr, cliaddr;int listenfd, connfd;int res, i;int clilen;res = pthread_mutex_init(&work_mutex,NULL);if(res != 0){fprintf(stderr,"mutex initialization failed\n");exit(1);}listenfd = socket(AF_INET,SOCK_STREAM,0);bzero(&servaddr,sizeof(servaddr));servaddr.sin_family = AF_INET;servaddr.sin_port = htons(9734);servaddr.sin_addr.s_addr = htonl(INADDR_ANY);bind(listenfd,(struct sockaddr*)&servaddr,sizeof(servaddr));listen(listenfd,5);for(i = 0; i < MAXCHILD; i++){if((childpid[i] = fork()) < 0){fprintf(stderr,"fork failed");exit(1);}else if(childpid[i] == 0)child_main(i, listenfd);}signal(SIGINT,sig_int);for(;;)pause();}。