1 files changed, 82 insertions, 0 deletions
diff --git a/src/network/gethostbyname2_r.c b/src/network/gethostbyname2_r.c
new file mode 100644
index 0000000..a5eb67f
--- /dev/null
+++ b/src/network/gethostbyname2_r.c
@@ -0,0 +1,82 @@
+#define _GNU_SOURCE
+
+#include <sys/socket.h>
+#include <netdb.h>
+#include <string.h>
+#include <netinet/in.h>
+#include <errno.h>
+#include <stdint.h>
+#include "lookup.h"
+
+int gethostbyname2_r(const char *name, int af,
+	struct hostent *h, char *buf, size_t buflen,
+	struct hostent **res, int *err)
+{
+	struct address addrs[MAXADDRS];
+	char canon[256];
+	int i, cnt;
+	size_t align, need;
+
+	*res = 0;
+	cnt = __lookup_name(addrs, canon, name, af, AI_CANONNAME);
+	if (cnt<0) switch (cnt) {
+	case EAI_NONAME:
+		*err = HOST_NOT_FOUND;
+		return 0;
+	case EAI_NODATA:
+		*err = NO_DATA;
+		return 0;
+	case EAI_AGAIN:
+		*err = TRY_AGAIN;
+		return EAGAIN;
+	default:
+	case EAI_FAIL:
+		*err = NO_RECOVERY;
+		return EBADMSG;
+	case EAI_SYSTEM:
+		*err = NO_RECOVERY;
+		return errno;
+	}
+
+	h->h_addrtype = af;
+	h->h_length = af==AF_INET6 ? 16 : 4;
+
+	/* Align buffer */
+	align = -(uintptr_t)buf & sizeof(char *)-1;
+
+	need = 4*sizeof(char *);
+	need += (cnt + 1) * (sizeof(char *) + h->h_length);
+	need += strlen(name)+1;
+	need += strlen(canon)+1;
+	need += align;
+
+	if (need > buflen) return ERANGE;
+
+	buf += align;
+	h->h_aliases = (void *)buf;
+	buf += 3*sizeof(char *);
+	h->h_addr_list = (void *)buf;
+	buf += (cnt+1)*sizeof(char *);
+
+	for (i=0; i<cnt; i++) {
+		h->h_addr_list[i] = (void *)buf;
+		buf += h->h_length;
+		memcpy(h->h_addr_list[i], addrs[i].addr, h->h_length);
+	}
+	h->h_addr_list[i] = 0;
+
+	h->h_name = h->h_aliases[0] = buf;
+	strcpy(h->h_name, canon);
+	buf += strlen(h->h_name)+1;
+
+	if (strcmp(h->h_name, name)) {
+		h->h_aliases[1] = buf;
+		strcpy(h->h_aliases[1], name);
+		buf += strlen(h->h_aliases[1])+1;
+	} else h->h_aliases[1] = 0;
+
+	h->h_aliases[2] = 0;
+
+	*res = h;
+	return 0;
+}