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my_webserv.c
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my_webserv.c
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#include"socklib.h"
#include"headers.h"
/* The following are some function need after, let's make a declatation. */
/* to deal the remaining infomation that follows the 'GET' sentence */
void read_til_end(FILE *fp);
/* This is the function that deals with the request */
void process_on(char *, int);
/* if the parameter is illegle then call this function */
void cannot_do(int);
/* if the parameter is a dirictory then show what's in it */
int isdir(char *);
void ls_dir(char *, int);
/* if the parameter is a runnable program */
int can_run(char *);
void do_exe(char *, int);
/* if the parameter is a file ,picture or someting like that, then display it */
void show_file(char *,int);
/* to wirte the header like "HTTP/1.0 200 OK" */
void header(FILE *, char *);
int main(int ac, char **args)
{
if (ac != 2)
oops("parameters",1);
int sock_id,sock_fd;
char request[BUFSIZ];
void wait_child(int);
FILE *sock_fp;
sock_id = make_server_socket(atoi(args[1]));
if (sock_id == -1)
oops("socket",2);
/* to handle SIGCHLD */
signal(SIGCHLD,wait_child);
while (1)
{
sock_fd = accept(sock_id,NULL,NULL);
sock_fp = fdopen(sock_fd,"r");
/* get the very first line */
fgets(request,BUFSIZ,sock_fp);
printf("get a call:request = %s\n",request);
/* deal with the infomation that left*/
read_til_end(sock_fp);
/* to deal with command and parameter */
process_on(request,sock_fd);
fclose(sock_fp);
}
return 0;
}
/* wait till all child terminate */
void wait_child(int signum)
{
while (waitpid(-1,NULL,WNOHANG)>0)
;
}
void read_til_end(FILE *fp)
{
char buf[BUFSIZ];
while (fgets(buf,BUFSIZ,fp) != NULL && strcmp(buf,"\r\n") != 0)
;
}
void process_on(char *request, int fd)
{
char cmd[BUFSIZ],args[BUFSIZ];
strcpy(args,"./");
if (fork() != 0)
return ;
if (sscanf(request,"%s%s",cmd,args+2) != 2)
return;
if (strcmp(cmd,"GET") != 0)
cannot_do(fd);
else if (isdir(args))
ls_dir(args,fd);
else if (can_run(args))
do_exe(args,fd);
else
show_file(args,fd);
exit(0); /* to terminate this process */
}
void cannot_do(int fd)
{
FILE *fp=fdopen(fd,"w");
fprintf(fp,"HTTP/1.1 501\r\n");
fprintf(fp,"\r\n");
fclose(fp);
}
void header(FILE *fp, char *type)
{
fprintf(fp,"HTTP/1.1 200\r\n");
if (type)
fprintf(fp,"Content-type:%s\r\n",type);
}
int isdir(char *args)
{
struct stat info;
if (stat(args,&info) == -1)
return 0;
return (S_ISDIR(info.st_mode)); /* man 7 inode */
}
void ls_dir(char *args, int fd)
{
FILE *fp=fdopen(fd,"w");
header(fp,"text/plain");
fprintf(fp,"\r\n");
fflush(fp);
/* redirect */
if (dup2(fd,1) == -1)
oops("dup2",1);
if (dup2(fd,2) == -1)
oops("dup2",2);
close(fd);
fclose(fp);
execlp("ls","ls","-l",args,NULL);
oops("should not be here!",3);
}
char *get_suffix(char *f)
{
char *cp;
if ((cp=strrchr(f,'.')) != NULL)
return cp+1;
return "";
}
int can_run(char *args)
{
if (get_suffix(args) == NULL)
return 0;
else
{
if (strcmp(get_suffix(args),"cgi") == 0)
return 1;
else
return 0;
}
}
void do_exe(char *args, int fd)
{
if (dup2(fd,1) == -1)
oops("dup2",2);
if (dup2(fd,2) == -1)
oops("dup2",2);
FILE *fp = fdopen(fd,"w");
close(fd);
header(fp,NULL);
fprintf(fp,"\r\n");
fflush(fp);
fclose(fp);
execl(args,args,NULL);
oops(args,1);
}
void show_file(char *args, int fd)
{
FILE *to_write = fdopen(fd,"w");
FILE *to_read = fopen(args,"r");
int c;
char *content = "text/plain";
char *suffix=get_suffix(args);
if (strcmp(suffix,"html") == 0)
content = "text/html";
else if (strcmp(suffix,"gif") == 0)
content = "image/gif";
else if (strcmp(suffix,"jpg") == 0)
content = "image/jpeg";
else if (strcmp(suffix,"png") == 0)
content = "image/jpeg";
else
content = "text/plain";
header(to_write,content);
fprintf(to_write,"\r\n");
fflush(to_write);
if (to_write != NULL && to_read != NULL)
{
while ((c=getc(to_read)) != EOF)
{
putc(c,to_write);
}
}
fclose(to_read);
fclose(to_write);
}