A-small-web-server.rar_C实现web资源-CSDN文库

共8个文件

c：2个

html：1个

nweb_suse_sles9_ppc64：1个

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A-small-web-server.rar （8个子文件）

一个小型的web服务器

nweb.c 7KB

nigel.jpg 10KB

nweb_AIX53 15KB

index.html 273B

client.c 1KB

es-nweb.zip 35KB

nweb_fedore5_x86 11KB

nweb_suse_sles9_ppc64 26KB

#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <string.h> #include <fcntl.h> #include <signal.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #define BUFSIZE 8096 #define ERROR 42 #define SORRY 43 #define LOG 44 struct { char *ext; char *filetype; } extensions [] = { {"gif", "image/gif" }, {"jpg", "image/jpeg"}, {"jpeg","image/jpeg"}, {"png", "image/png" }, {"zip", "image/zip" }, {"gz", "image/gz" }, {"tar", "image/tar" }, {"htm", "text/html" }, {"html","text/html" }, {0,0} }; void log(int type, char *s1, char *s2, int num) { int fd ; char logbuffer[BUFSIZE*2]; switch (type) { case ERROR: (void)sprintf(logbuffer,"ERROR: %s:%s Errno=%d exiting pid=%d",s1, s2, errno,getpid()); break; case SORRY: (void)sprintf(logbuffer, "<HTML><BODY><H1>nweb Web Server Sorry: %s %s</H1></BODY></HTML>\r\n", s1, s2); (void)write(num,logbuffer,strlen(logbuffer)); (void)sprintf(logbuffer,"SORRY: %s:%s",s1, s2); break; case LOG: (void)sprintf(logbuffer," INFO: %s:%s:%d",s1, s2,num); break; } /* no checks here, nothing can be done a failure anyway */ if((fd = open("nweb.log", O_CREAT| O_WRONLY | O_APPEND,0644)) >= 0) { (void)write(fd,logbuffer,strlen(logbuffer)); (void)write(fd,"\n",1); (void)close(fd); } if(type == ERROR || type == SORRY) exit(3); } /* this is a child web server process, so we can exit on errors */ void web(int fd, int hit) { int j, file_fd, buflen, len; long i, ret; char * fstr; static char buffer[BUFSIZE+1]; /* static so zero filled */ ret =read(fd,buffer,BUFSIZE); /* read Web request in one go */ if(ret == 0 || ret == -1) { /* read failure stop now */ log(SORRY,"failed to read browser request","",fd); } if(ret > 0 && ret < BUFSIZE) /* return code is valid chars */ buffer[ret]=0; /* terminate the buffer */ else buffer[0]=0; for(i=0;i<ret;i++) /* remove CF and LF characters */ if(buffer[i] == '\r' || buffer[i] == '\n') buffer[i]='*'; log(LOG,"request",buffer,hit); if( strncmp(buffer,"GET ",4) && strncmp(buffer,"get ",4) ) log(SORRY,"Only simple GET operation supported",buffer,fd); for(i=4;i<BUFSIZE;i++) { /* null terminate after the second space to ignore extra stuff */ if(buffer[i] == ' ') { /* string is "GET URL " +lots of other stuff */ buffer[i] = 0; break; } } for(j=0;j<i-1;j++) /* check for illegal parent directory use .. */ if(buffer[j] == '.' && buffer[j+1] == '.') log(SORRY,"Parent directory (..) path names not supported",buffer,fd); if( !strncmp(&buffer[0],"GET /\0",6) || !strncmp(&buffer[0],"get /\0",6) ) /* convert no filename to index file */ (void)strcpy(buffer,"GET /index.html"); /* work out the file type and check we support it */ buflen=strlen(buffer); fstr = (char *)0; for(i=0;extensions[i].ext != 0;i++) { len = strlen(extensions[i].ext); if( !strncmp(&buffer[buflen-len], extensions[i].ext, len)) { fstr =extensions[i].filetype; break; } } if(fstr == 0) log(SORRY,"file extension type not supported",buffer,fd); if(( file_fd = open(&buffer[5],O_RDONLY)) == -1) /* open the file for reading */ log(SORRY, "failed to open file",&buffer[5],fd); log(LOG,"SEND",&buffer[5],hit); (void)sprintf(buffer,"HTTP/1.0 200 OK\r\nContent-Type: %s\r\n\r\n", fstr); (void)write(fd,buffer,strlen(buffer)); /* send file in 8KB block - last block may be smaller */ while ( (ret = read(file_fd, buffer, BUFSIZE)) > 0 ) { (void)write(fd,buffer,ret); } #ifdef LINUX sleep(1); /* to allow socket to drain */ #endif exit(1); } int main(int argc, char **argv) { int i, port, pid, listenfd, socketfd, hit; size_t length; static struct sockaddr_in cli_addr; /* static = initialised to zeros */ static struct sockaddr_in serv_addr; /* static = initialised to zeros */ if( argc < 3 || argc > 3 || !strcmp(argv[1], "-?") ) { (void)printf("hint: nweb Port-Number Top-Directory\n\n" "\tnweb is a small and very safe mini web server\n" "\tnweb only servers out file/web pages with extensions named below\n" "\t and only from the named directory or its sub-directories.\n" "\tThere is no fancy features = safe and secure.\n\n" "\tExample: nweb 8181 /home/nwebdir &\n\n" "\tOnly Supports:"); for(i=0;extensions[i].ext != 0;i++) (void)printf(" %s",extensions[i].ext); (void)printf("\n\tNot Supported: URLs including \"..\", Java, Javascript, CGI\n" "\tNot Supported: directories / /etc /bin /lib /tmp /usr /dev /sbin \n" "\tNo warranty given or implied\n\tNigel Griffiths [email protected]\n" ); exit(0); } if( !strncmp(argv[2],"/" ,2 ) || !strncmp(argv[2],"/etc", 5 ) || !strncmp(argv[2],"/bin",5 ) || !strncmp(argv[2],"/lib", 5 ) || !strncmp(argv[2],"/tmp",5 ) || !strncmp(argv[2],"/usr", 5 ) || !strncmp(argv[2],"/dev",5 ) || !strncmp(argv[2],"/sbin",6) ){ (void)printf("ERROR: Bad top directory %s, see nweb -?\n",argv[2]); exit(3); } if(chdir(argv[2]) == -1){ (void)printf("ERROR: Can't Change to directory %s\n",argv[2]); exit(4); } /* Become deamon + unstopable and no zombies children (= no wait()) */ if(fork() != 0) return 0; /* parent returns OK to shell ,so it won't block the shell*/ (void)signal(SIGCLD, SIG_IGN); /* ignore child death */ (void)signal(SIGHUP, SIG_IGN); /* ignore terminal hangups */ for(i=0;i<32;i++) (void)close(i); /* close open files */ (void)setpgrp(); /* break away from process group */ log(LOG,"nweb starting",argv[1],getpid()); /* setup the network socket */ if((listenfd = socket(AF_INET, SOCK_STREAM,0)) <0) log(ERROR, "system call","socket",0); port = atoi(argv[1]); if(port < 0 || port >60000) log(ERROR,"Invalid port number (try 1->60000)",argv[1],0); serv_addr.sin_family = AF_INET; serv_addr.sin_addr.s_addr = htonl(INADDR_ANY); serv_addr.sin_port = htons(port); if(bind(listenfd, (struct sockaddr *)&serv_addr,sizeof(serv_addr)) <0) log(ERROR,"system call","bind",0); if( listen(listenfd,64) <0) log(ERROR,"system call","listen",0); for(hit=1; ;hit++) { length = sizeof(cli_addr); if((socketfd = accept(listenfd, (struct sockaddr *)&cli_addr, &length)) < 0) log(ERROR,"system call","accept",0); if((pid = fork()) < 0) { log(ERROR,"system call","fork",0); } else { if(pid == 0) { /* child */ (void)close(listenfd); web(socketfd,hit); /* never returns */ } else { /* parent */ (void)close(socketfd); } } } }