socket实践：远程计算

简介：
用C语言，基于linux提供的socket函数，分别用UDP和TCP编写一个实现“从客户端输入十个字符串，在服务器端完成字符数和单词数统计，并按首位字母排序”的远程计算的网络服务程序
程序功能：
·指定默认IP、端口，也可自定义IP、端口；
·带help参数运行程序可以看到程序说明和使用方法；
·TCP版本支持多线程同时处理请求；
·加入了报错提醒，退出控制等符合用户习惯的功能。

一、基于udp设计的代码：

服务端：

/*
 *FileName:server.c
 *Date:2019-7-1
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define BUF_SIZE 1024
void error_handling(char *message);

int main(int argc, char *argv[])
{
    if (argc==2){
        if (strcmp(argv[1],"help")==0||strcmp(argv[1],"HELP")==0){
            printf("说明：基于udp设计的服务端程序，用于远程统计字符和实现字符串排序\n使用方法：%s [<port>]\n(未自定义端口，默认使用8001端口)\n",argv[0]);
        exit(0);
        }
    }
    int serv_sock;
    char message[BUF_SIZE];
    int str_len;
    socklen_t clnt_adr_sz;
    
    struct sockaddr_in serv_adr, clnt_adr;
    
    
    serv_sock=socket(PF_INET, SOCK_DGRAM, 0);
    if(serv_sock==-1)
        error_handling("UDP socket creation error");
    
    memset(&serv_adr, 0, sizeof(serv_adr));
    serv_adr.sin_family=AF_INET;
    serv_adr.sin_addr.s_addr=htonl(INADDR_ANY);
    if(argc!=2){
        printf("使用默认端口8001\n");
        serv_adr.sin_port=htons(8001);
    }else{
        serv_adr.sin_port=htons(atoi(argv[1]));
    }
    if(bind(serv_sock, (struct sockaddr*)&serv_adr, sizeof(serv_adr))==-1)
        error_handling("bind() error");

    while(1) 
    {
        clnt_adr_sz=sizeof(clnt_adr);
        str_len=recvfrom(serv_sock, message, BUF_SIZE, 0, 
                                (struct sockaddr*)&clnt_adr, &clnt_adr_sz);
        /**这里做处理**/
        //char *res="接受成功!(默认)";
        
            int wordnumber=1;
            int charnumber=0;
            int len=strlen(message);
            char flag=0;//上一个字符是否是A-z|0-9
            int savemess[10][100];

            /*统计字符、单词*/
            for (int ii=0; ii<strlen(message); ii++)
            {
                if ((message[ii]<='z'&&message[ii]>='A')||(message[ii]<='9'&&message[ii]>='0'))
                {
                    charnumber++;
                    flag=1;
                }else{
                    if (flag==1){
                        wordnumber++;
                        flag=0;
                    }
                }           
            
            }
            if (flag==0) wordnumber--;

            //printf("message：%s\n",message);
            /*对字符串进行分割*/
            char *result=NULL;
            int j=0;
            const char d[2]="\n";
            result=strtok(message,d);
            while (result!=NULL){
                //printf("字符串分割：%s\n",result);
                strcpy(savemess[j],result);
                j++;
                //if (j==10)break;
                result=strtok(NULL,d);
            }
            /*对字符串排序*/

            char tmp[100];
            for (j=0;j<10;j++){
                for(int k=0;k<9-j;k++){
                    if (strcmp(savemess[k],savemess[k+1])>0)
                    {                   
                        strcpy(tmp,savemess[k]);
                        strcpy(savemess[k],savemess[k+1]);
                        strcpy(savemess[k+1],tmp);
                    }
                }
            }
            char res[BUF_SIZE];
            sprintf(res,"字符数:%d,单词数:%d\n对字符串进行排序:\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
                charnumber,wordnumber,
                savemess[0],savemess[1],savemess[2],
                savemess[3],savemess[4],savemess[5],
                savemess[6],savemess[7],savemess[8],
                savemess[9]);
        /**这里做处理**/
        sendto(serv_sock, res, strlen(res), 0, 
                                (struct sockaddr*)&clnt_adr, clnt_adr_sz);
    }   
    close(serv_sock);
    return 0;
}

void error_handling(char *message)
{
    printf("\033[31m%s\n\033[0m\n",message);
    exit(1);
}

客户端：

/*
 *FileName:client.c
 *Date:2019-7-1
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define BUF_SIZE 1024
void error_handling(char *message);

int main(int argc, char *argv[])
{
    if (argc==2){
        if (strcmp(argv[1],"help")==0||strcmp(argv[1],"HELP")==0){
            printf("说明：基于udp设计的客户端程序，用于远程统计字符和实现字符串排序\n使用方法：%s [<port>]\n(未自定义IP端口，默认使用IP127.0.0.1和8001端口)\n",argv[0]);
        exit(0);
        }
    }
    int sock;
    char message[BUF_SIZE];
    int str_len;
    socklen_t adr_sz;
    
    struct sockaddr_in serv_adr, from_adr;
    
    
    sock=socket(PF_INET, SOCK_DGRAM, 0);   
    if(sock==-1)
        error_handling("socket() error");
    
    memset(&serv_adr, 0, sizeof(serv_adr));
    serv_adr.sin_family=AF_INET;

    if(argc!=3){
        serv_adr.sin_addr.s_addr=inet_addr("127.0.0.1");
        serv_adr.sin_port=htons(8001);
        printf("监听默认IP：127.0.0.1 端口：8001\n");
    }else{
        serv_adr.sin_addr.s_addr=inet_addr(argv[1]);
        serv_adr.sin_port=htons(atoi(argv[2]));
    }

    connect(sock, (struct sockaddr*)&serv_adr, sizeof(serv_adr));

    while(1)
    {
        printf("请输入信息(10行，输入q/Q则退出): \n");
        char ms[10][100];

        for (int i=0;i<10;i++){
            fgets(ms[i], BUF_SIZE, stdin);
            //scanf("%[^\n]",ms[i]);
            if(!strcmp(ms[i],"q\n") || !strcmp(ms[i],"Q\n"))
            {       
                exit(0);
            }
        }
        sprintf(message,"%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
            ms[0],ms[1],ms[2],ms[3],ms[4],
            ms[5],ms[6],ms[7],ms[8],ms[9]);
        if(!strcmp(message,"q\n") || !strcmp(message,"Q\n"))
            break;
        
        write(sock, message, strlen(message));
        str_len=read(sock, message, BUF_SIZE-1);
        message[str_len]=0;
        printf("服务端消息: %s", message);

    }   
    close(sock);
    return 0;
}

void error_handling(char *message)
{
    printf("\033[31m%s\n\033[0m\n",message);
    exit(1);
}

二、基于tcp设计的代码：

服务端：

/*
 *FileName:server.c
 *Date:2019-7-1
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <pthread.h>

#define BUF_SIZE 1024
typedef struct Socks
{
    int fd;
    struct sockaddr_in addr;
};

void error_handling(char *message);
void *ProcessRequest(void *p);
int main(int argc, char *argv[])
{
    if (argc==2){
        if (strcmp(argv[1],"help")==0||strcmp(argv[1],"HELP")==0){
            printf("说明：给予tcp设计的服务端程序，用于远程统计字符和实现字符串排序\n使用方法：%s [<port>]\n(未自定义端口，默认使用8000端口)\n",argv[0]);
        exit(0);
        }
    }
    int serv_sock;  
    int i=0;
    struct sockaddr_in serv_adr;
    
    
    serv_sock=socket(PF_INET, SOCK_STREAM, 0);   
    if(serv_sock==-1)
        error_handling("socket() error");
    
    memset(&serv_adr, 0, sizeof(serv_adr));
    serv_adr.sin_family=AF_INET;
    serv_adr.sin_addr.s_addr=htonl(INADDR_ANY);
    if(argc!=2) {
        serv_adr.sin_port=htons(8000);
        printf("使用默认端口号8000\n");
    }else{
        serv_adr.sin_port=htons(atoi(argv[1]));
    }
    if(bind(serv_sock, (struct sockaddr*)&serv_adr, sizeof(serv_adr))==-1)
        error_handling("bind() error");
    
    if(listen(serv_sock, 5)==-1)
        error_handling("listen() error");


    while(1)
    {
        struct sockaddr_in clnt_adr;
        socklen_t clnt_adr_sz=sizeof(clnt_adr);
        int clnt_sock=accept(serv_sock, (struct sockaddr*)&clnt_adr, &clnt_adr_sz);
        if(clnt_sock==-1)
            error_handling("accept() error");
        else
            printf("Connected client %d \n", ++i);
    
        pthread_t tid = 0;
        struct Socks *s=(struct Socks *)malloc(sizeof(struct Socks));
        s->fd=clnt_sock;
        s->addr=clnt_adr;
        pthread_create(&tid, NULL, (void *)ProcessRequest, (void *)s); 
        pthread_detach(tid);
    }

    close(serv_sock);
    return 0;
}

void error_handling(char *message)
{
    printf("\033[31m%s\n\033[0m\n",message);
    exit(1);
}

void *ProcessRequest(void *p)
{
    struct Socks *s=(struct Socks *)p;
    int new_sock=s->fd;
    struct sockaddr_in clnt_adr=s->addr;
    char message[BUF_SIZE];
    int str_len;
    while((str_len=read(new_sock, message, BUF_SIZE))!=0)
    {
        int wordnumber=1;
        int charnumber=0;
        int len=strlen(message);
        char flag=0;//上一个字符是否是A-z|0-9
        int savemess[10][100];

        /*统计字符、单词*/
        for (int i=0; i<strlen(message); i++)
        {
            if ((message[i]<='z'&&message[i]>='A')||(message[i]<='9'&&message[i]>='0'))
            {
                charnumber++;
                flag=1;
            }else{
                if (flag==1){
                    wordnumber++;
                    flag=0;
                }
            }           
                
        }
        if (flag==0) wordnumber--;

        //printf("message：%s\n",message);
        /*对字符串进行分割*/
        char *result=NULL;
        int j=0;
        const char d[2]="\n";
        result=strtok(message,d);
        while (result!=NULL){
            //printf("字符串分割：%s\n",result);
            strcpy(savemess[j],result);
            j++;
            //if (j==10)break;
            result=strtok(NULL,d);
        }
        /*对字符串排序*/

        char tmp[100];
        for (j=0;j<10;j++){
            for(int k=0;k<9-j;k++){
                if (strcmp(savemess[k],savemess[k+1])>0)
                {                   
                    strcpy(tmp,savemess[k]);
                    strcpy(savemess[k],savemess[k+1]);
                    strcpy(savemess[k+1],tmp);
                }
            }
        }
        char res[BUF_SIZE];
        sprintf(res,"字符数:%d,单词数:%d\n对字符串进行排序:\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
            charnumber,wordnumber,
            savemess[0],savemess[1],savemess[2],
            savemess[3],savemess[4],savemess[5],
            savemess[6],savemess[7],savemess[8],
            savemess[9]);

        write(new_sock, res, strlen(res));
    }   
    close(new_sock);
    free(s);
}

客户端：

/*
 *FileName:client.c
 *Date:2019-7-1
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define BUF_SIZE 1024
void error_handling(char *message);

int main(int argc, char *argv[])
{
    if (argc==2){
        if (strcmp(argv[1],"help")==0||strcmp(argv[1],"HELP")==0){
            printf("说明：给予udp设计的客户端程序，输入10行字符串，交由服务端统计字符和对字符串排序\n使用方法：%s [<ip> <port>]\n(未自定义IP、端口，默认使用127.0.0.1本机IP以及8001端口)\n",argv[0]);
        exit(0);
        }
    }

    int sock;
    char message[BUF_SIZE];
    int str_len;
    struct sockaddr_in serv_adr;
    
    sock=socket(PF_INET, SOCK_STREAM, 0);   
    if(sock==-1)
        error_handling("socket() error");
    
    memset(&serv_adr, 0, sizeof(serv_adr));
    serv_adr.sin_family=AF_INET;
    if(argc!=3) {
        serv_adr.sin_addr.s_addr=inet_addr("127.0.0.1");
        serv_adr.sin_port=htons(8000);
        printf("使用默认IP：127.0.0.1 端口：8000\n");
    }else{
        serv_adr.sin_addr.s_addr=inet_addr(argv[1]);
        serv_adr.sin_port=htons(atoi(argv[2]));
    }
    if(connect(sock, (struct sockaddr*)&serv_adr, sizeof(serv_adr))==-1)
        error_handling("connect() error!");
    else
        printf("TCP建立成功!\n");
    
    while(1) 
    {
        printf("请输入信息(10行，输入q/Q则退出): \n");
        char ms[10][100];

        for (int i=0;i<10;i++){
    
            fgets(ms[i], BUF_SIZE, stdin);
            if(!strcmp(ms[i],"q\n") || !strcmp(ms[i],"Q\n"))
            {       
                exit(0);
            }
            //scanf("%[^\n]",ms[i]);
        }
        sprintf(message,"%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
            ms[0],ms[1],ms[2],ms[3],ms[4],
            ms[5],ms[6],ms[7],ms[8],ms[9]);
        if(!strcmp(message,"q\n") || !strcmp(message,"Q\n"))
            break;
        
        write(sock, message, strlen(message));
        str_len=read(sock, message, BUF_SIZE-1);
        message[str_len]=0;
        printf("服务端消息: %s\n", message);
    }
    
    close(sock);
    return 0;
}

void error_handling(char *message)
{
    printf("\033[31m%s\n\033[0m\n",message);
    exit(1);
}