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server.c
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server.c
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#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" },
{"php", "image/php" },
{"cgi", "text/cgi" },
{"asp","text/asp" },
{"jsp", "image/jsp" },
{"xml", "text/xml" },
{"js","text/js" },
{"css","test/css" },
{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>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;
}
if((fd = open("server.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);
}
void web(int fd, int hit)
{
int j, file_fd, buflen, len;
long i, ret;
char * fstr;
static char buffer[BUFSIZE+1];
ret =read(fd,buffer,BUFSIZE);
if(ret == 0 || ret == -1) {
log(SORRY,"failed to read browser request","",fd);
}
if(ret > 0 && ret < BUFSIZE)
buffer[ret]=0;
else buffer[0]=0;
for(i=0;i<ret;i++)
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++) {
if(buffer[i] == ' ') {
buffer[i] = 0;
break;
}
}
for(j=0;j<i-1;j++)
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) )
(void)strcpy(buffer,"GET /index.html");
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)
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));
while ( (ret = read(file_fd, buffer, BUFSIZE)) > 0 ) {
(void)write(fd,buffer,ret);
}
#ifdef LINUX
sleep(1);
#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 struct sockaddr_in serv_addr;
if( argc < 3 || argc > 3 || !strcmp(argv[1], "-?") ) {
(void)printf("usage: server [port] [server directory] &"
"\tExample: server 80 ./ &\n\n"
"\tOnly Supports:");
for(i=0;extensions[i].ext != 0;i++)
(void)printf(" %s",extensions[i].ext);
(void)printf("\n\tNot Supported: directories / /etc /bin /lib /tmp /usr /dev /sbin \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 server -?\n",argv[2]);
exit(3);
}
if(chdir(argv[2]) == -1){
(void)printf("ERROR: Can't Change to directory %s\n",argv[2]);
exit(4);
}
if(fork() != 0)
return 0;
(void)signal(SIGCLD, SIG_IGN);
(void)signal(SIGHUP, SIG_IGN);
for(i=0;i<32;i++)
(void)close(i);
(void)setpgrp();
log(LOG,"http server starting",argv[1],getpid());
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) {
(void)close(listenfd);
web(socketfd,hit);
} else {
(void)close(socketfd);
}
}
}
}