- /******* http客戶端程序 httpclient.c ************/
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <errno.h>
- #include <unistd.h>
- #include <netinet/in.h>
- #include <limits.h>
- #include <netdb.h>
- #include <arpa/inet.h>
- #include <ctype.h>
- //////////////////////////////httpclient.c 開始///////////////////////////////////////////
- /********************************************
- 功能：搜索字符串右邊起的第一個匹配字符
- ********************************************/
- char * Rstrchr(char * s, char x) {
- int i = strlen(s);
- if(!(*s)) return 0;
- while(s[i-1]) if(strchr(s + (i - 1), x)) return (s + (i - 1)); else i--;
- return 0;
- }
- /********************************************
- 功能：把字符串轉換為全小寫
- ********************************************/
- void ToLowerCase(char * s) {
- while(*s) *s=tolower(*s++);
- }
- /**************************************************************
- 功能：從字符串src中分析出網站地址和端口，并得到用戶要下載的文件
- ***************************************************************/
- void GetHost(char * src, char * web, char * file, int * port) {
- char * pA;
- char * pB;
- memset(web, 0, sizeof(web));
- memset(file, 0, sizeof(file));
- *port = 0;
- if(!(*src)) return;
- pA = src;
- if(!strncmp(pA, "http://", strlen("http://"))) pA = src+strlen("http://");
- else if(!strncmp(pA, "https://", strlen("https://"))) pA = src+strlen("https://");
- pB = strchr(pA, '/');
- if(pB) {
- memcpy(web, pA, strlen(pA) - strlen(pB));
- if(pB+1) {
- memcpy(file, pB + 1, strlen(pB) - 1);
- file[strlen(pB) - 1] = 0;
- }
- }
- else memcpy(web, pA, strlen(pA));
- if(pB) web[strlen(pA) - strlen(pB)] = 0;
- else web[strlen(pA)] = 0;
- pA = strchr(web, ':');
- if(pA) *port = atoi(pA + 1);
- else *port = 80;
- }
- /*********************************************************************
- *filename: httpclient.c
- *purpose: HTTP協議客戶端程序，可以用來下載網頁
- *wrote by: zhoulifa(zhoulifa@163.com) 周立發(http://zhoulifa.bokee.com)
- Linux愛好者 Linux知識傳播者 SOHO族 開發者 最擅長C語言
- *date time:2006-03-11 21:49:00
- *Note: 任何人可以任意復制代碼并運用這些代碼，當然包括你的商業用途
- * 但請遵循GPL
- *********************************************************************/
- int main(int argc, char *argv[])
- {
- int sockfd;
- char buffer[1024];
- struct sockaddr_in server_addr;
- struct hostent *host;
- int portnumber,nbytes;
- char host_addr[256];
- char host_file[1024];
- char local_file[256];
- FILE * fp;
- char request[1024];
- int send, totalsend;
- int i;
- char * pt;
- if(argc!=2)
- {
- fprintf(stderr,"Usage:%s web-address\a\n",argv[0]);
- exit(1);
- }
- printf("parameter.1 is: %s\n", argv[1]);
- ToLowerCase(argv[1]);/*將參數轉換為全小寫*/
- printf("lowercase parameter.1 is: %s\n", argv[1]);
- GetHost(argv[1], host_addr, host_file, &portnumber);/*分析網址、端口、文件名等*/
- printf("webhost:%s\n", host_addr);
- printf("hostfile:%s\n", host_file);
- printf("portnumber:%d\n\n", portnumber);
- if((host=gethostbyname(host_addr))==NULL)/*取得主機IP地址*/
- {
- fprintf(stderr,"Gethostname error, %s\n", strerror(errno));
- exit(1);
- }
- /* 客戶程序開始建立 sockfd描述符 */
- if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1)/*建立SOCKET連接*/
- {
- fprintf(stderr,"Socket Error:%s\a\n",strerror(errno));
- exit(1);
- }
- /* 客戶程序填充服務端的資料 */
- bzero(&server_addr,sizeof(server_addr));
- server_addr.sin_family=AF_INET;
- server_addr.sin_port=htons(portnumber);
- server_addr.sin_addr=*((struct in_addr *)host->h_addr);
- /* 客戶程序發起連接請求 */
- if(connect(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1)/*連接網站*/
- {
- fprintf(stderr,"Connect Error:%s\a\n",strerror(errno));
- exit(1);
- }
- sprintf(request, "GET /%s HTTP/1.1\r\nAccept: */*\r\nAccept-Language: zh-cn\r\n\
- User-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)\r\n\
- Host: %s:%d\r\nConnection: Close\r\n\r\n", host_file, host_addr, portnumber);
- printf("%s", request);/*準備request，將要發送給主機*/
- /*取得真實的文件名*/
- if(host_file && *host_file) pt = Rstrchr(host_file, '/');
- else pt = 0;
- memset(local_file, 0, sizeof(local_file));
- if(pt && *pt) {
- if((pt + 1) && *(pt+1)) strcpy(local_file, pt + 1);
- else memcpy(local_file, host_file, strlen(host_file) - 1);
- }
- else if(host_file && *host_file) strcpy(local_file, host_file);
- else strcpy(local_file, "index.html");
- printf("local filename to write:%s\n\n", local_file);
- /*發送http請求request*/
- send = 0;totalsend = 0;
- nbytes=strlen(request);
- while(totalsend < nbytes) {
- send = write(sockfd, request + totalsend, nbytes - totalsend);
- if(send==-1) {printf("send error!%s\n", strerror(errno));exit(0);}
- totalsend+=send;
- printf("%d bytes send OK!\n", totalsend);
- }
- fp = fopen(local_file, "a");
- if(!fp) {
- printf("create file error! %s\n", strerror(errno));
- return 0;
- }
- printf("\nThe following is the response header:\n");
- i=0;
- /* 連接成功了，接收http響應，response */
- while((nbytes=read(sockfd,buffer,1))==1)
- {
- if(i < 4) {
- if(buffer[0] == '\r' || buffer[0] == '\n') i++;
- else i = 0;
- printf("%c", buffer[0]);/*把http頭信息打印在屏幕上*/
- }
- else {
- fwrite(buffer, 1, 1, fp);/*將http主體信息寫入文件*/
- i++;
- if(i%1024 == 0) fflush(fp);/*每1K時存盤一次*/
- }
- }
- fclose(fp);
- /* 結束通訊 */
- close(sockfd);
- exit(0);
- }
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