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Automatically enforce the use of the nsock select engine if we detect that stdin

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is a regular file.

Under linux, that provides epoll(7), this allows proper behavior when
redirecting a regular file to stdin (e.g.: 'ncat localhost < file.txt').

Bug was reported by Michal Hlavinka. See
http://seclists.org/nmap-dev/2012/q3/490 for more details.
This commit is contained in:
henri
2012-08-18 16:25:50 +00:00
parent a18d0b2ff0
commit af2f0960ab
1 changed files with 20 additions and 0 deletions
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20
ncat/ncat_connect.c
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@@ -458,11 +458,31 @@ bail:
return -1;
}
#if defined(LINUX)
static int stdin_is_reg(void) {
struct stat buf;
if (fstat(STDIN_FILENO, &buf) < 0)
fatal("fstat(): %s", strerror(errno));
return S_ISREG(buf.st_mode);
}
#endif
int ncat_connect(void)
{
nsock_pool mypool;
int rc;
#if defined(LINUX)
/* -- Hack!!
* epoll(7) doesn't support regular files (e.g.: ncat < file.c)
* If we detect that STDIN is a regular file, then we enforce
* the use of the select-based engine. */
if (stdin_is_reg())
nsock_set_default_engine("select");
#endif
/* Create an nsock pool */
if ((mypool = nsp_new(NULL)) == NULL)
bye("Failed to create nsock_pool.");