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Old 10-03-2003, 12:58 PM   #1
Registered: Sep 2003
Location: Chicago
Distribution: Slackware 14.1
Posts: 60

Rep: Reputation: 15
a CGI written in C, problem with an fopen() system call

hello everyone. i have a question regaurding fopen() system call in C (this program is a CGI)..

well, for some reason, this snippet of code errors... every other fopen() seems to work 'cept for this one, and i don't think i've done anything differently from my other fopen() calls

#define HASHES "/path/to/hashes"
/* arg1-arg6 + user + pass are parsed out elsewhere from
/* massive part of code omitted */
if(atoi(arg3) == 1)
   char hashbuff[1024];
   char hash[1024];
   FILE *HashFile;
   char* HashArrayTable[2];
   sprintf(hash, "%s/%s", HASHES, arg5);
/***************** this is the problem **************************************/
   if((HashFile=fopen(hash, "r")) == NULL);
     fprintf(stderr, "[%s] [error] [client: %s] ", ctime(time(NULL)), getenv("REMOTE_ADDR"));
     fprintf(stderr, "%s:", hash);
     perror("Unable to open");
     printf("Invalid service<p><p>\n");
     printf("<form method=\"GET\" action=\"\">\n");
     printf("<input type=\"hidden\" name=\"page\" value=\"admin\">\n");
     printf("<input type=\"hidden\" name=\"arg1\" value=\"%s\">\n", arg1);
     printf("<input type=\"hidden\" name=\"arg2\" value=\"adduser\">\n");
     printf("<input type=\"hidden\" name=\"arg3\" value=\"1\">\n");
     printf("<b>Add User</b><p>\n");
     printf("User Name:&nbsp; <input type=\"text\" name=\"user\" size=\"20\" value=\"%s\"><p>\n", user);
     printf("Password:&nbsp; <input type=\"password\" name=\"pass\" size=\"20\"><p>\n");
     printf("Level:&nbsp; <input type=\"text\" name=\"arg4\" size=\"20\" value=\"%s\"><p>\n", arg4);
     printf("<b>*</b>Service:&nbsp; <select size=\"1\" name=\"arg5\">\n");
     while((dirp = readdir(dp)) != NULL){
      if(strcasecmp(dirp->d_name, " ") && strcasecmp(dirp->d_name, ".") && strcasecmp(dirp->d_name, ".."))
        printf("<option>%s</option>\n", dirp->d_name);
     printf("<p><input type=\"submit\" name=\"arg6\" value=\"Add User\"><p>\n</form>\n");
// code ommited
// lots more code omitted
for some reason, i get a "Numerical result out of range" when i try to fopen().. could anyone shed some light on the subject
Old 10-03-2003, 02:11 PM   #2
Registered: Aug 2003
Location: Planet Earth
Distribution: Linux Mint Debian Edition (LMDE)
Posts: 215

Rep: Reputation: 31
Re: a CGI written in C, problem with an fopen() system call

I don't know if this is related, but you probably don't want that semicolon on end of the if statement.

   if((HashFile=fopen(hash, "r")) == NULL);
Old 10-03-2003, 02:18 PM   #3
Registered: Sep 2003
Location: Chicago
Distribution: Slackware 14.1
Posts: 60

Original Poster
Rep: Reputation: 15
errrr..... that would help :-P... see what happens when a person codes half asleep at 3:30 in the morning...



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