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/** \file servport.c Resolve service name to port number.
* \author Matthias Andree
* \date 2005
*
* Copyright (C) 2005 by Matthias Andree
* For license terms, see the file COPYING in this directory.
*/
#include "fetchmail.h"
#include "i18n.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#elif defined(HAVE_NETINET_IN_H)
#include <netinet/in.h>
#endif
int servport(const char *service) {
int port;
unsigned long u;
char *end;
if (service == 0)
return -1;
/*
* Check if the service is a number. If so, convert it.
* If it isn't a number, call getservbyname to resolve it.
*/
errno = 0;
u = strtoul(service, &end, 10);
if (errno || end[strspn(end, POSIX_space)] != '\0') {
struct servent *se;
/* hardcode kpop to port 1109 as per fetchmail(1)
* manual page, it's not a IANA registered service */
if (strcmp(service, "kpop") == 0)
return 1109;
se = getservbyname(service, "tcp");
if (se == NULL) {
endservent();
goto err;
} else {
port = ntohs(se->s_port);
endservent();
}
} else {
if (u == 0 || u > 65535)
goto err;
port = u;
}
return port;
err:
report(stderr, GT_("Cannot resolve service %s to port. Please specify the service as decimal port number.\n"), service);
return -1;
}
/* end of servport.c */
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