On 2018-01-20, Jordon <open...@sirjorj.com> wrote:
> I am still learning cgi/web stuff and stumbled upon an issue. I am
> trying to popen() a program to catch what it dumps to stdout. To start
> simply, I am just trying to run uname. I get nothing. No errors on
> popen() or pclose(), but nothing printed. I run the same code from a
> regular cpp program (changing the khtml_puts() to printf() and it works
> perfectly. That makes me wonder if there is something environmental
> that I am missing, or maybe this is just not allowed.
>
> My code is this:
>
> char dump[1024];
> memset(dump, 0, sizeof(dump));
> FILE *f = popen("uname -a", "r");
> if(f == NULL) {
> khtml_puts(&r, "popen()FAILED!");
> } else {
> khtml_puts(&r, "output: ");
> while (fgets(dump, sizeof(dump), f) != NULL) {
> khtml_puts(&r, "GOTSOMETHING!");
> khtml_puts(&r, dump);
> }
> int status = pclose(f);
> if(status==-1) {
> khtml_puts(&r, "pclose()FAILED");
> }
> }
> khtml_puts(&r, "done");
>
>
> All I get from it is "output: done"
>
>
>
> Also, my httpd.conf is this:
>
> ext_addr="egress"
> prefork 2
> server "localhost" {
> listen on $ext_addr port 80
> root "/htdocs"
> location "/cgi-bin/*" {
> fastcgi
> root "/"
> }
> }
>
> Any ideas?
>
>
popen() requires a shell. You are most likely running it in a chroot and
don't have /bin/sh.
