简单http_server的C语言实现
主要实现以下几点：
1.静态文件访问，包括jpg、html、css等
2.文件不存在404
3.目录列表
4.501 Not Implemented
=============================================================================
启动脚本
#!/bin/shps -ef | grep fasthttp | grep -v grep | awk '{print $2}' | xargs -t -i kill -9 {} >/dev/nullgcc fasthttp.c -o fasthttp$(pwd)/fasthttp#include <string.h>#include <stdio.h>#include <stdlib.h>#include <netinet/in.h>#include <error.h>#include <errno.h>#include <sys/types.h>#include <dirent.h>#include <sys/socket.h>#include <sys/stat.h>#include <unistd.h>#include <fcntl.h>// 建立socket 开始侦听 接收连接 接收客户端数据 解析http协议 发送文件数据给客户端#define HTTP_PORT "2010"#define MAX_CONNECTION 10#define DOCUMENT_ROOT "www"#define LOG_PATH "log/access.log"void parser(char *s,char res[][255],char host[][255]);static char *strtoupper( char *s );static long filesize(const char *filename);static int file_exists(const char *filename);static void mime_content_type( const char *name, char *ret );static int WriteLog( const char *message );static int is_dir(const char *filename);static unsigned short g_is_log = 1;static int g_log_fd = 0;int main(void){ int server_sock; int client_sock; struct sockaddr_in server_addr; struct sockaddr_in client_addr; struct sockaddr_in sin; struct stat file_stat; pid_t pid; char client_ip[100]; char buf[20000]; char buf_all[2000]; char buf1[2000]; char p[3][255]; char h[3][255]; char tmp[2000]; char cwd[1024]; char filename[2000]; char filepath[2000]; int fd,size; int currentConn = 0; DIR * dir; struct dirent * ptr; chdir("../"); if ( (pid = fork()) < 0 ) { perror("fork"); exit(1); } else if ( pid != 0) { exit(1); } if((server_sock = socket(AF_INET,SOCK_STREAM,0)) < 0) { perror("socket"); exit(1); } memset(&server_addr,0,sizeof(server_addr)); server_addr.sin_family = AF_INET; server_addr.sin_port = htons(atoi(HTTP_PORT)); server_addr.sin_addr.s_addr = htonl(INADDR_ANY); if(bind(server_sock,(struct sockaddr*)&server_addr,sizeof(server_addr)) < 0) { perror("bind"); exit(1); } if(listen(server_sock,MAX_CONNECTION) < 0) { perror("listen"); exit(1); } printf("fasthttp successful created ...\n"); while(1) { unsigned int clientlen = sizeof(client_addr); if((client_sock = accept(server_sock,(struct sockaddr*)&client_addr,&clientlen)) < 0) { perror("accept"); exit(1); } if((pid = fork()) == 0) { if(read(client_sock,buf,20000) < 0) { perror("read data from client"); exit(1); } parser(buf,p,h); if(strcmp(strtoupper(p[0]),"GET") != 0 && strcmp(strtoupper(p[0]),"POST") != 0 && strcmp(strtoupper(p[0]),"HEAD") != 0) { memset(&buf,0,sizeof(buf)); sprintf(buf, "HTTP/1.1 501 Not Implemented\r\nServer: %s\r\nContent-Type: text/html\r\nContent-Length: 1489\r\nAccept-Ranges: bytes\r\nConnection: close\r\n\r\n", "Apache"); write(client_sock,buf,strlen(buf)); memset(&buf,0,sizeof(buf)); sprintf(buf,"<h2>%s Method Not Implemented</h2>","501"); write(client_sock,buf,strlen(buf)); close(client_sock); exit(0); } if(strcmp(p[1],"/") == 0) { memset(&tmp,0,sizeof(tmp)); sprintf(tmp,"%s","index.html"); strcat(p[1],tmp); } WriteLog(p[1]); getcwd(filepath, sizeof(filepath)); strcat(filepath,"/"); strcat(filepath,DOCUMENT_ROOT); strcat(filepath,p[1]); if(!file_exists(filepath)) { memset(&buf,0,sizeof(buf)); sprintf(buf, "HTTP/1.1 404 Not Found\r\nServer: %s\r\nContent-Type: text/html\r\nContent-Length: 257271\r\nConnection: close\r\n\r\n", "Apache"); write(client_sock,buf,strlen(buf)); memset(&buf,0,sizeof(buf)); sprintf(buf,"<html><head><title>404 Not Found</title></head><body bgcolor="white"><center><h1>404 Not Found</h1></center><hr><center>Powered by %s</center></body></html>","fasthttp"); write(client_sock,buf,strlen(buf)); close(client_sock); memset(&buf,0,sizeof(buf)); sprintf(buf,"404 Not Found\t%s\n",filepath); WriteLog(buf); exit(0); } if(access(filepath,R_OK) < 0) { memset(&buf,0,sizeof(buf)); sprintf(buf, "HTTP/1.1 403 Forbidden\r\nServer: %s\r\nContent-Type: text/html\r\nContent-Length: 25727\r\nConnection: close\r\n\r\n", "Apache"); write(client_sock,buf,strlen(buf)); close(client_sock); exit(0); } /** 目录列表 **/ if(is_dir(filepath)) { memset(&tmp,0,sizeof(tmp)); sprintf(tmp,"<html><head><title>Index of %s</title></head><body><h1>Index of %s</h1><ul><li><a href="/"> Parent Directory</a></li>",filepath,filepath); strcat(buf,tmp); if((dir = opendir(filepath)) != NULL) { while((ptr = readdir(dir)) != NULL) { if(strcmp(ptr->d_name,".") == 0 || strcmp(ptr->d_name,"..") == 0) { continue; } memset(&buf,0,sizeof(buf)); sprintf(buf,"%s/%s",filepath,ptr->d_name); if(is_dir(buf)) { memset(&buf,0,sizeof(buf)); sprintf(buf,"<li><a href="%s/"> %s/</a></li>",ptr->d_name,ptr->d_name); } else { memset(&buf,0,sizeof(buf)); sprintf(buf,"<li><a href="%s"> %s</a></li>",ptr->d_name,ptr->d_name); } strcat(tmp,buf); } } closedir(dir); memset(&buf,0,sizeof(buf)); sprintf(buf,"%s","</ul>"); strcat(tmp,buf); memset(&buf,0,sizeof(buf)); sprintf(buf, "HTTP/1.1 200 OK\r\nServer: fasthttp\r\nContent-Type: text/html;charset=utf-8\r\nContent-Length: %d\r\nConnection: close\r\n\r\n", strlen(tmp)); write(client_sock,buf,strlen(buf)); write(client_sock,tmp,strlen(tmp)); close(client_sock); } memset(&tmp,0,sizeof(tmp)); mime_content_type(filepath,tmp); memset(&buf,0,sizeof(buf)); sprintf(buf, "HTTP/1.1 200 OK\r\nServer: %s\r\nContent-Type: %s\r\nContent-Length: 25727\r\nConnection: close\r\n\r\n", "Apache",tmp); write(client_sock,buf,strlen(buf)); memset(&buf,0,sizeof(buf)); fd = open(filepath,O_RDONLY); read(fd,buf,filesize(filepath)); close(fd); write(client_sock,buf,filesize(filepath)); close(client_sock); memset(&buf,0,sizeof(buf)); sprintf(buf,"200 OK\t%s\t%d\n",filepath,filesize(filepath)); WriteLog(buf); exit(0); } else { wait(NULL); } close(client_sock); } }void parser(char *s,char res[][255],char host[][255]){ int i,j = 0; int n; char hosts[255]; for (i = 0;s[i] != '\r';i++) /* obtain the first line in http protocol head */ ; s[i] = '\0'; n=i++; for (i = 0,j = 0;i < 3;i++,j++) /* divide the protocol head in blank */ { strcpy(res[j],strsep(&s," ")); } for(i=n;s[i] != '\r';i++) { strcat(hosts,s[i]); } for (i = 0,j = 0;i < 3;i++,j++) /* divide the protocol head in blank */ { strcpy(host[j],strsep(&hosts,":")); } }/** * strtoupper - string to upper * */static char *strtoupper( char *s ){ int i, len = sizeof(s); for( i = 0; i < len; i++ ) { s[i] = ( s[i] >= 'a' && s[i] <= 'z' ? s[i] + 'A' - 'a' : s[i] ); } return(s);}/** * filesize - get file size */static long filesize(const char *filename){ struct stat buf; if (!stat(filename, &buf)) { return buf.st_size; } return 0;}/** * file_exists - check file is exist */static int file_exists(const char *filename){ struct stat buf; if (stat(filename, &buf) < 0) { if (errno == ENOENT) { return 0; } } return 1;}/** * Get MIME type header * */static void mime_content_type( const char *name, char *ret ){ char *dot, *buf; dot = strrchr(name, '.'); /* Text */ if ( strcmp(dot, ".txt") == 0 ){ buf = "text/plain"; } else if ( strcmp( dot, ".css" ) == 0 ){ buf = "text/css"; } else if ( strcmp( dot, ".js" ) == 0 ){ buf = "text/javascript"; } else if ( strcmp(dot, ".xml") == 0 || strcmp(dot, ".xsl") == 0 ){ buf = "text/xml"; } else if ( strcmp(dot, ".xhtm") == 0 || strcmp(dot, ".xhtml") == 0 || strcmp(dot, ".xht") == 0 ){ buf = "application/xhtml+xml"; } else if ( strcmp(dot, ".html") == 0 || strcmp(dot, ".htm") == 0 || strcmp(dot, ".shtml") == 0 || strcmp(dot, ".hts") == 0 ){ buf = "text/html"; /* Images */ } else if ( strcmp( dot, ".gif" ) == 0 ){ buf = "image/gif"; } else if ( strcmp( dot, ".png" ) == 0 ){ buf = "image/png"; } else if ( strcmp( dot, ".bmp" ) == 0 ){ buf = "application/x-MS-bmp"; } else if ( strcmp( dot, ".jpg" ) == 0 || strcmp( dot, ".jpeg" ) == 0 || strcmp( dot, ".jpe" ) == 0 || strcmp( dot, ".jpz" ) == 0 ){ buf = "image/jpeg"; /* Audio & Video */ } else if ( strcmp( dot, ".wav" ) == 0 ){ buf = "audio/wav"; } else if ( strcmp( dot, ".wma" ) == 0 ){ buf = "audio/x-ms-wma"; } else if ( strcmp( dot, ".wmv" ) == 0 ){ buf = "audio/x-ms-wmv"; } else if ( strcmp( dot, ".au" ) == 0 || strcmp( dot, ".snd" ) == 0 ){ buf = "audio/basic"; } else if ( strcmp( dot, ".midi" ) == 0 || strcmp( dot, ".mid" ) == 0 ){ buf = "audio/midi"; } else if ( strcmp( dot, ".mp3" ) == 0 || strcmp( dot, ".mp2" ) == 0 ){ buf = "audio/x-mpeg"; } else if ( strcmp( dot, ".rm" ) == 0 || strcmp( dot, ".rmvb" ) == 0 || strcmp( dot, ".rmm" ) == 0 ){ buf = "audio/x-pn-realaudio"; } else if ( strcmp( dot, ".avi" ) == 0 ){ buf = "video/x-msvideo"; } else if ( strcmp( dot, ".3gp" ) == 0 ){ buf = "video/3gpp"; } else if ( strcmp( dot, ".mov" ) == 0 ){ buf = "video/quicktime"; } else if ( strcmp( dot, ".wmx" ) == 0 ){ buf = "video/x-ms-wmx"; } else if ( strcmp( dot, ".asf" ) == 0 || strcmp( dot, ".asx" ) == 0 ){ buf = "video/x-ms-asf"; } else if ( strcmp( dot, ".mp4" ) == 0 || strcmp( dot, ".mpg4" ) == 0 ){ buf = "video/mp4"; } else if ( strcmp( dot, ".mpe" ) == 0 || strcmp( dot, ".mpeg" ) == 0 || strcmp( dot, ".mpg" ) == 0 || strcmp( dot, ".mpga" ) == 0 ){ buf = "video/mpeg"; /* Documents */ } else if ( strcmp( dot, ".pdf" ) == 0 ){ buf = "application/pdf"; } else if ( strcmp( dot, ".rtf" ) == 0 ){ buf = "application/rtf"; } else if ( strcmp( dot, ".doc" ) == 0 || strcmp( dot, ".dot" ) == 0 ){ buf = "application/msword"; } else if ( strcmp( dot, ".xls" ) == 0 || strcmp( dot, ".xla" ) == 0 ){ buf = "application/msexcel"; } else if ( strcmp( dot, ".hlp" ) == 0 || strcmp( dot, ".chm" ) == 0 ){ buf = "application/mshelp"; } else if ( strcmp( dot, ".swf" ) == 0 || strcmp( dot, ".swfl" ) == 0 || strcmp( dot, ".cab" ) == 0 ){ buf = "application/x-shockwave-flash"; } else if ( strcmp( dot, ".ppt" ) == 0 || strcmp( dot, ".ppz" ) == 0 || strcmp( dot, ".pps" ) == 0 || strcmp( dot, ".pot" ) == 0 ){ buf = "application/mspowerpoint"; /* Binary & Packages */ } else if ( strcmp( dot, ".zip" ) == 0 ){ buf = "application/zip"; } else if ( strcmp( dot, ".rar" ) == 0 ){ buf = "application/x-rar-compressed"; } else if ( strcmp( dot, ".gz" ) == 0 ){ buf = "application/x-gzip"; } else if ( strcmp( dot, ".jar" ) == 0 ){ buf = "application/java-archive"; } else if ( strcmp( dot, ".tgz" ) == 0 || strcmp( dot, ".tar" ) == 0 ){ buf = "application/x-tar"; } else { buf = "application/octet-stream"; } strcpy(ret, buf);}/** * Log message * */static int WriteLog( const char *message ){ if ( !g_is_log ) { fprintf(stderr, "%s", message); return 0; } if ( g_log_fd == 0 ) { char g_log_path[2000]; getcwd(g_log_path, sizeof(g_log_path)); strcat(g_log_path,"/"); strcat(g_log_path,LOG_PATH); if ( (g_log_fd = open(g_log_path, O_RDWR|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) == -1 ) { perror("open log file error"); return -1; } } if (write(g_log_fd, message, strlen(message)) == -1) { perror("write log error"); return -1; } return 0;}/** * is_dir - check file is directory * */static int is_dir(const char *filename){ struct stat buf; if ( stat(filename, &buf) < 0 ){ return -1; } if (S_ISDIR(buf.st_mode)){ return 1; } return 0;}