1 files changed, 41 insertions, 0 deletions
diff --git a/src/network/getservbyname_r.c b/src/network/getservbyname_r.c
new file mode 100644
index 00000000..5c025150
--- /dev/null
+++ b/src/network/getservbyname_r.c
@@ -0,0 +1,41 @@
+#define _GNU_SOURCE
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <string.h>
+
+int getservbyname_r(const char *name, const char *prots,
+	struct servent *se, char *buf, size_t buflen, struct servent **res)
+{
+	struct addrinfo *ai, hint = { .ai_family = AF_INET };
+	int i;
+
+	/* Align buffer */
+	i = (uintptr_t)buf & sizeof(char *)-1;
+	if (!i) i = sizeof(char *);
+	if (buflen < 3*sizeof(char *)-i) {
+		errno = ERANGE;
+		return -1;
+	}
+	buf += sizeof(char *)-i;
+	buflen -= sizeof(char *)-i;
+
+	if (!strcmp(prots, "tcp")) hint.ai_protocol = IPPROTO_TCP;
+	else if (!strcmp(prots, "udp")) hint.ai_protocol = IPPROTO_UDP;
+	else return -1;
+
+	if (getaddrinfo(0, name, &hint, &ai) < 0) return -1;
+
+	se->s_name = (char *)name;
+	se->s_aliases = (void *)buf;
+	se->s_aliases[0] = se->s_name;
+	se->s_aliases[1] = 0;
+	se->s_port = ((struct sockaddr_in *)ai->ai_addr)->sin_port;
+	se->s_proto = (char *)prots;
+
+	freeaddrinfo(ai);
+	*res = se;
+	return 0;
+}