Add new servport.c file to resolve service -> port for non-IPv6 builds.

svn path=/trunk/; revision=4216

1 files changed, 62 insertions, 0 deletions

diff --git a/servport.c b/servport.c
new file mode 100644
index 00000000..2f69faba
--- /dev/null
+++ b/servport.c
@@ -0,0 +1,62 @@
+/** \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 */