user/libc: reorganize net stuff, basic hosts-only gethostbyname()

/usr/share/hosts because i don't have /etc/ yet and i don't feel like creating it.

1 files changed, 91 insertions, 0 deletions

diff --git a/src/libc/net/socket.c b/src/libc/net/socket.c
new file mode 100644
index 0000000..9eacbe5
--- /dev/null
+++ b/src/libc/net/socket.c
@@ -0,0 +1,91 @@
+#include <arpa/inet.h>
+#include <camellia.h>
+#include <camellia/syscalls.h>
+#include <errno.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <sys/socket.h>
+
+int socket(int domain, int type, int protocol) {
+	if (domain != AF_INET || type != SOCK_STREAM || protocol != IPPROTO_TCP) {
+		return errno = ENOSYS, -1;
+	}
+	int h = _sys_getnull(0);
+	if (h < 0) {
+		return errno = -h, -1;
+	} else {
+		return h;
+	}
+}
+
+int bind(int, const struct sockaddr *, socklen_t) {
+	return errno = ENOSYS, -1;
+}
+
+int accept(int, struct sockaddr *, socklen_t *) {
+	return errno = ENOSYS, -1;
+}
+
+int listen(int, int) {
+	return errno = ENOSYS, -1;
+}
+
+int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen) {
+	char buf[256];
+	struct sockaddr_in *addr4 = (void*)addr;
+	uint32_t ip;
+	uint16_t port;
+	int newfd;
+
+	if (addr->sa_family != AF_INET) {
+		return errno = ENOSYS, -1;
+	}
+
+	if (addrlen < (ssize_t)sizeof(*addr4)) {
+		return errno = EINVAL, -1;
+	}
+
+	ip   = ntohl(addr4->sin_addr.s_addr);
+	port = ntohs(addr4->sin_port);
+	if (snprintf(buf, 256, "/net/connect/0/%ld/tcp/%d", ip, port) >= 256) {
+		return errno = EGENERIC, -1;
+	}
+	newfd = camellia_open(buf, OPEN_READ | OPEN_WRITE);
+	if (newfd < 0) {
+		return -1;
+	}
+	dup2(newfd, sockfd);
+	close(newfd);
+	return 0;
+}
+
+ssize_t send(int sockfd, const void *buf, size_t len, int flags) {
+	if (flags != 0) {
+		return errno = ENOSYS, -1;
+	}
+	return write(sockfd, buf, len);
+}
+
+ssize_t recv(int sockfd, void *buf, size_t len, int flags) {
+	if (flags != 0) {
+		return errno = ENOSYS, -1;
+	}
+	return read(sockfd, buf, len);
+}
+
+int getsockopt(int, int, int, void *, socklen_t *) {
+	return errno = ENOSYS, -1;
+}
+
+int setsockopt(int, int, int, const void *, socklen_t) {
+	return 0;
+}
+
+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;
+	return 0;
+}