1 files changed, 72 insertions, 0 deletions
diff --git a/src/network/lookup_serv.c b/src/network/lookup_serv.c
new file mode 100644
index 00000000..bf4cba09
--- /dev/null
+++ b/src/network/lookup_serv.c
@@ -0,0 +1,72 @@
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <ctype.h>
+#include <string.h>
+#include <fcntl.h>
+#include "lookup.h"
+#include "stdio_impl.h"
+
+int __lookup_serv(struct service buf[static MAXSERVS], const char *name, int proto, int flags)
+{
+	char line[128];
+	int cnt = 0;
+	char *p, *z = "";
+	unsigned long port = 0;
+
+	if (name) {
+		if (!*name) return EAI_SERVICE;
+		port = strtoul(name, &z, 10);
+	}
+	if (!*z) {
+		if (port > 65535) return EAI_SERVICE;
+		if (proto != IPPROTO_UDP) {
+			buf[cnt].port = port;
+			buf[cnt++].proto = IPPROTO_TCP;
+		}
+		if (proto != IPPROTO_TCP) {
+			buf[cnt].port = port;
+			buf[cnt++].proto = IPPROTO_UDP;
+		}
+		return cnt;
+	}
+
+	if (flags & AI_NUMERICSERV) return EAI_SERVICE;
+
+	size_t l = strlen(name);
+
+	unsigned char _buf[1032];
+	FILE _f, *f = __fopen_rb_ca("/etc/services", &_f, _buf, sizeof _buf);
+	if (!f) return EAI_SERVICE;
+
+	while (fgets(line, sizeof line, f) && cnt < MAXSERVS) {
+		if ((p=strchr(line, '#'))) *p++='\n', *p=0;
+
+		/* Find service name */
+		for(p=line; (p=strstr(p, name)); p++) {
+			if (p>line && !isspace(p[-1])) continue;
+			if (p[l] && !isspace(p[l])) continue;
+			break;
+		}
+		if (!p) continue;
+
+		/* Skip past canonical name at beginning of line */
+		for (p=line; *p && !isspace(*p); p++);
+		if (!p) continue;
+
+		port = strtoul(p, &z, 10);
+		if (port > 65535 || z==p) continue;
+		if (!strncmp(z, "/udp", 4)) {
+			if (proto == IPPROTO_TCP) continue;
+			buf[cnt].port = port;
+			buf[cnt++].proto = IPPROTO_UDP;
+		}
+		if (!strncmp(z, "/tcp", 4)) {
+			if (proto == IPPROTO_UDP) continue;
+			buf[cnt].port = port;
+			buf[cnt++].proto = IPPROTO_TCP;
+		}
+	}
+	__fclose_ca(f);
+	return cnt > 0 ? cnt : EAI_SERVICE;
+}