C++实现一个web服务器, 弱智版服务器
监听本地的8888端口， 当在浏览器中访问这个地址的时候， 返回一堆HTML数据， 这种方式返回的数据不稳定，不同浏览器解析不同， 因为我们没有定义返回文件类型：
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <unistd.h> int main() {
int sock = socket(AF_INET, SOCK_STREAM, );
struct sockaddr_in address;
address.sin_family = AF_INET;
address.sin_port = htons();
address.sin_addr.s_addr = inet_addr("192.168.0.58");
int ret = bind(sock , (const struct sockaddr*)&address , sizeof(address));
ret = listen(sock, );
printf("lisening..\n"); struct sockaddr_in client_address;
socklen_t len;
int newsock = accept(sock, (struct sockaddr*)&client_address, &len);
printf("client conneting\n");
FILE *fp = fopen("./html/index.html","rb");
char buf[] = {};
fread(buf, , , fp);
printf("content is %s\n", buf);
send(newsock, buf, strlen(buf), );
close(newsock);
close(sock);
return ;
}
给服务器的返回设置文件类型和文件大小信息， 避免页面出现乱码和页面的正常解析：
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <unistd.h> int main() {
int sock = socket(AF_INET, SOCK_STREAM, );
struct sockaddr_in address;
address.sin_family = AF_INET;
address.sin_port = htons();
address.sin_addr.s_addr = inet_addr("192.168.1.102");
int ret = bind(sock , (const struct sockaddr*)&address , sizeof(address));
ret = listen(sock, );
printf("lisening..\n"); struct sockaddr_in client_address;
socklen_t len;
int newsock = accept(sock, (struct sockaddr*)&client_address, &len);
printf("client conneting\n"); //char recvData[1024] ={0};
//recv(newsock, recvData, sizeof(recvData), 0);
//printf("receive data:%s", recvData);
FILE *fp = fopen("./html/index.html","rb"); if( fp == NULL ){
printf("failed to open img\n");
}
fseek(fp, , SEEK_END);
long fileLen = ftell(fp);
fseek(fp, , SEEK_SET); char buf[] = {};
strcat(buf, "HTTP/1.0 200 OK\r\n");
strcat(buf, "Content-Type: text/html;charset=UTF-8\r\n"); char contentLength[] = {};
sprintf(contentLength, "Content-Length: %ld\r\n\r\n", fileLen);
strcat(buf, contentLength); fread(buf+strlen(buf), , , fp);
send(newsock, buf, strlen(buf), );
close(newsock);
close(sock);
return ;
}
打开本地的PNG图片，并返回给客户端浏览器， 和上面的代码还有一点区别就是， 服务器有返回Content－type和Content-Length ：
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <unistd.h> int main() {
int sock = socket(AF_INET, SOCK_STREAM, );
struct sockaddr_in address;
address.sin_family = AF_INET;
address.sin_port = htons();
address.sin_addr.s_addr = inet_addr("192.168.1.102");
int ret = bind(sock , (const struct sockaddr*)&address , sizeof(address));
ret = listen(sock, );
printf("lisening..\n"); struct sockaddr_in client_address;
socklen_t len;
int newsock = accept(sock, (struct sockaddr*)&client_address, &len);
printf("client conneting\n");
FILE *fp = fopen("./imgs/img.png","rb");
if( fp == NULL ){
printf("failed to open img\n");
}
fseek(fp, , SEEK_END);
long fileLen = ftell(fp);
fseek(fp, , SEEK_SET); char buf[] = {};
strcat(buf, "HTTP/1.0 200 OK\r\n");
strcat(buf, "Content-Type: image\png;charset=UTF-8\r\n"); char contentLength[] = {};
sprintf(contentLength, "Content-Length: %ld\r\n\r\n", fileLen);
strcat(buf, contentLength); //strlen just string length; but sizeof return all the size;
fread(buf+strlen(buf), , , fp);
send(newsock, buf, , ); close(newsock);
close(sock);
return ;
}
搭建一个服务器：
/*****************************************************************
system:kali enviroment:g++ compile command:gcc webServer.c -g -o webServer -lpthread *****************************************************************/ #include <stdlib.h> #include <sys/types.h> #include <sys/socket.h> #include <sys/stat.h> #include <netinet/in.h> #include <unistd.h> #include <pthread.h> #include <stdio.h> #include <string.h> #include <arpa/inet.h> #define PORT 8848 #define BACKLOG 5 #define MAXDATASIZE 1000 #define DEBUG 1 void process_cli(int connectfd, sockaddr_in client); int sendobj(int connectfd,char* serverfilepath); int IsDIR(char* fpath); int fileordirExist(char* fpath); char* getextname(char*); void* getHead(char* extname); void* start_routine(void* arg); void msg404(int connectfd); struct ARG { int connfd; sockaddr_in client; }; main() { int listenfd, connectfd; pthread_t thread; //id of thread ARG *arg; //pass this var to the thread struct sockaddr_in server; //server's address info struct sockaddr_in client; //client's int sin_size; //create tcp socket #ifdef DEBUG printf("socket.... "); #endif if ((listenfd = socket(AF_INET, SOCK_STREAM, )) == -) { perror("creating socket failed."); exit(); } int opt = SO_REUSEADDR; setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)); bzero(&server,sizeof(server)); server.sin_family = AF_INET; server.sin_port = htons(PORT); server.sin_addr.s_addr = htonl(INADDR_ANY); printf("bind.... "); if(bind(listenfd,(struct sockaddr *)&server,sizeof(struct sockaddr)) == -) { perror("bind error."); exit(); } printf("listen.... "); if(listen(listenfd,BACKLOG) == -) { perror("listen() error "); exit(); } sin_size = sizeof(struct sockaddr_in); while() { //accept() using main thread printf("accepting.... "); if((connectfd = accept(listenfd, (struct sockaddr *)&client, (socklen_t*)&sin_size)) == -) { printf("accept() error "); } arg = new ARG; arg->connfd = connectfd; memcpy((void *)&arg->client, &client, sizeof(client)); //invoke start_routine to handle this thread #ifdef DEBUG printf("thread_creating...."); #endif if(pthread_create(&thread, NULL, start_routine, (void*)arg)){ perror("pthread_create() error"); exit(); } } close(listenfd); } //handle the request of the client void process_cli(int connectfd, sockaddr_in client) { int num; //char recvbuf[MAXDATASIZE], sendbuf[MAXDATASIZE], cli_name[MAXDATASIZE]; char requestline[MAXDATASIZE], filepath[MAXDATASIZE], cmd[MAXDATASIZE],extname[MAXDATASIZE]; int c; FILE *fp; FILE *cfp; fp = fdopen(connectfd,"r"); #ifdef DEBUG printf("the host is:%s ",inet_ntoa(client.sin_addr) ); #endif fgets(requestline,MAXDATASIZE,fp); #ifdef DEBUG printf(" THE REQUEST IS :%s ",requestline); #endif strcpy(filepath,"./"); sscanf(requestline,"%s%s",cmd,filepath+); strcpy(extname, getextname(filepath)); #ifdef DEBUG printf("cmd:%s filepath:%s extname:%s ",cmd,filepath,extname); printf("string comparing :::::::::::::start::::::::::::::: "); #endif if(strcmp(cmd,"GET") == ){ //the command is get #ifdef DEBUG printf("cmd(%s)==GET \n",cmd); #endif //is this a file or dir or notexist?
printf("filepath is .... : %s\n", filepath);
if(fileordirExist(filepath)){ //is a file or dir or none //is this a dir if(IsDIR(filepath)){ //is a dir #ifdef DEBUG printf("%s is a DIR ",filepath); #endif if( fileordirExist( strcat(filepath,"index.htm") )){ sendobj(connectfd,"index.htm"); }else if(fileordirExist(strcat(filepath,"index.html"))){ sendobj(connectfd,"index.htm"); }else{ msg404(connectfd); } }else{ //is a file #ifdef DEBUG printf("%s is a file\n",filepath); #endif sendobj(connectfd, filepath); } }else{ #ifdef DEBUG printf("404 "); #endif msg404(connectfd); } }else{ #ifdef DEBUG printf("cmd(%s)!=GET \n",cmd); #endif } #ifdef DEBUG printf(":::::::::::::end::::::::::::::: \n"); #endif close(connectfd); } //send the 404 error message to the client void msg404(int connectfd) { char* msg; msg = "HTTP/1.0 404 Not Found Content-Type: text/plain 404 not found by Manio"; send(connectfd,msg,strlen(msg),); } //is the filepath a file or directory int fileordirExist(char* fpath) { struct stat filestat; return ( stat(fpath,&filestat) != -); } // is the filepath a directory int IsDIR(char* fpath) { #ifdef DEBUG printf("IN IsDIR "); #endif struct stat filestat; return ( stat(fpath,&filestat) != - && S_ISDIR(filestat.st_mode)); } //send the data of the file which the client want int sendobj(int connectfd,char* serverfilepath) { FILE* fp,*cfp;
char buf[] = {}; int c; fp = fopen(serverfilepath,"rb"); printf("filepath is %s \n ", serverfilepath); if( fp == NULL ){
printf("failed to open html file\n");
}
fseek(fp, , SEEK_END);
long fileLen = ftell(fp);
fseek(fp, , SEEK_SET); strcat(buf, "HTTP/1.0 200 OK\r\n");
strcat(buf, "Content-Type: ");
char* fileExt = getextname(serverfilepath);
strcat(buf, (char *)getHead(fileExt));
strcat(buf, ";charset=UTF-8\r\n"); char contentLength[] = {};
sprintf(contentLength, "Content-Length: %ld\r\n\r\n", fileLen);
strcat(buf, contentLength); fread(buf+strlen(buf), , , fp);
printf("buf is %s\n", buf);
send(connectfd, buf, strlen(buf), ); return ; } //write the packet header to the client void* getHead(char* extname) { #ifdef DEBUG printf("INGETHEAD:::::::extname is %s::::::: \n",extname); #endif char* content = "text/plain"; if( strcmp(extname,"html") == || strcmp(extname,"htm") == ) content = "text/html"; else if ( strcmp(extname,"css") == ) content = "text/css"; else if ( strcmp(extname,"gif") == ) content = "image/gif"; else if ( strcmp(extname,"jpeg") == || strcmp(extname,"jpg") == ) content = "image/jpeg"; else if ( strcmp(extname,"png") == ) content = "image/png"; return (void *)content; } //get the extent name of the file char* getextname(char* filepath) { char* p; if(( p = strrchr(filepath,'.')) != NULL) return p+; return NULL; } //invoked by pthread_create void* start_routine(void* arg) { ARG *info; info = (ARG *)arg; process_cli(info->connfd, info->client); delete arg; pthread_exit(NULL); }
C语言的限制很少..类型可以随便转..系统相对于把所有的权利交给我们了， 所以C语言容易出问题
C++搭建一个web服务器：http://www.cppblog.com/cuijixin/archive/2008/07/02/55112.html
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