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/*
* Read from the network and check that it matches an expected token.
*
* Takes a timeout and a token to expect, reads bytes from the network equal
* in length to the token, and checks that the network reply matches the
* token. Used as a helper routine for any lbcd load module that needs to
* check a banner returned by a remote service.
*
* Written by Larry Schwimmer
* Copyright 1997, 1998, 2008, 2012
* The Board of Trustees of the Leland Stanford Junior University
*
* See LICENSE for licensing terms.
*/
#include <config.h>
#include <portable/socket.h>
#include <portable/system.h>
#ifdef HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif
#include <sys/time.h>
#include <modules/modules.h>
/*
* Given a socket, timeout, and token, check that one can read data matching
* token from the socket within timeout seconds. Returns 0 on success and -1
* on failure.
*/
int
lbcd_check_reply(socket_type sd, int timeout, const char *token)
{
struct timeval tv = { 0, 0 };
fd_set rset;
int retval = 0;
char *buf;
int len;
tv.tv_sec = timeout;
if (token == NULL)
return -1;
len = strlen(token);
buf = malloc(len + 1);
if (buf == NULL)
return -1;
FD_ZERO(&rset);
FD_SET(sd, &rset);
if (select(sd + 1, &rset, NULL, NULL, &tv) > 0) {
buf[len] = '\0';
if (socket_read(sd, buf, len) > 0) {
if (strcmp(buf, token) != 0)
retval = -1;
} else {
retval = -1;
}
} else {
retval = -1;
}
free(buf);
return retval;
}
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