libc: better curl compat

I can now actually curl an entire page :^)

1 files changed, 17 insertions, 4 deletions

diff --git a/src/libc/net/socket.c b/src/libc/net/socket.c
index 9eacbe5..04d73f4 100644
--- a/src/libc/net/socket.c
+++ b/src/libc/net/socket.c
@@ -5,6 +5,7 @@
 #include <netdb.h>
 #include <netinet/in.h>
 #include <stdio.h>
+#include <string.h>
 #include <sys/socket.h>
 
 int socket(int domain, int type, int protocol) {
@@ -83,9 +84,21 @@ int setsockopt(int, int, int, const void *, socklen_t) {
 }
 
 int getsockname(int sockfd, struct sockaddr *addr, socklen_t *addrlen) {
-	// TODO /net/ should expose local address somehow
-	/* dummy output, just to satisfy curl */
-	(void)sockfd; (void)addrlen;
-	addr->sa_family = AF_UNSPEC;
+	// TODO /net/ should expose the local address somehow
+
+	/* Outputs a fake address, just to satisfy curl.
+	 * Can't be AF_UNSPEC, as curl tries to print it with inet_ntop. */
+	(void)sockfd;
+	struct sockaddr_in dummy = {
+		.sin_family = AF_INET,
+		.sin_port = 0,
+		.sin_addr = {0},
+	};
+	if ((int)sizeof(dummy) < *addrlen) {
+		*addrlen = sizeof(dummy);
+	} else if (*addrlen < 0) {
+		return errno = EINVAL, -1;
+	}
+	memcpy(addr, &dummy, *addrlen);
 	return 0;
 }