/******* 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-addressa ",argv[0]); exit(1); } printf("parameter.1 is: %s ", argv[1]); ToLowerCase(argv[1]);/*將參數轉換為全小寫*/ printf("lowercase parameter.1 is: %s ", argv[1]); GetHost(argv[1], host_addr, host_file, &portnumber);/*分析網址、端口、文件名等*/ printf("webhost:%s ", host_addr); printf("hostfile:%s ", host_file); printf("portnumber:%d ", portnumber); if((host=gethostbyname(host_addr))==NULL)/*取得主機IP地址*/ { fprintf(stderr,"Gethostname error, %s ", 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:%sa ",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:%sa ",strerror(errno)); exit(1); } //sprintf(request, "GET /test.html HTTP/1.1\r\nAccept: */*\r\nUser-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)\r\nHost: www.2duche.com\r\n\r\n"); sprintf(request, "GET /test.html HTTP/1.1\r\nAccept: */*\r\nAccept-Language: zh-cn\r\nUser-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)\r\nHost: www.2duche.com\r\nConnection: Close\r\n\r\n");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 ", 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 ", strerror(errno));exit(0);} totalsend+=send; printf("%d bytes send OK! ", totalsend); } fp = fopen(local_file, "a"); if(!fp) { printf("create file error! %s ", strerror(errno)); return 0; } printf(" The following is the response header: "); 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] == ' ' || buffer[0] == ' ') 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); }