From 3b9029a94641563b9dda4f75694e499be9366d0a Mon Sep 17 00:00:00 2001
From: mrb0nk500 <b0nk@b0nk.xyz>
Date: Thu, 10 Jun 2021 23:20:38 -0400
Subject: Finished `init_socket()`.

---
 pullreqd.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 70 insertions(+), 3 deletions(-)

diff --git a/pullreqd.c b/pullreqd.c
index b3029ae..a4501c6 100644
--- a/pullreqd.c
+++ b/pullreqd.c
@@ -15,6 +15,8 @@
 #include <unistd.h>
 #include "config.h"
 
+#define UNIX_PATH_MAX 108
+
 pid_t fork_proc() {
 	/* Fork off the parent. */
 	pid_t pid = fork();
@@ -91,17 +93,82 @@ int init_socket(config *cfg) {
 		struct sockaddr_un sa_un;
 		struct sockaddr_in sa_in;
 	} sock_addr;
+	/* Size of the socket address we're using. */
+	size_t sockaddr_size = 0;
 	/* Set socket type to unix socket, if socket-type was set to unix, otherwise set it to network socket. */
 	const int sock_type = (!strcasecmp(cfg->sock_type, "unix")) ? AF_UNIX : AF_INET;
+
+	if (sock_type == AF_UNIX) {
+		size_t path_length = strlen(cfg->sock);
+		if (path_length >= UNIX_PATH_MAX) {
+			syslog(LOG_ERR, "The socket path is too long, and exceeded %i characters.", UNIX_PATH_MAX);
+			return -1;
+		}
+
+		sockaddr_size = sizeof(sock_addr.sa_un);
+		sock_addr.sa_un.sun_family = sock_type;
+		memcpy(sock_addr.sa_un.sun_path, cfg->sock, path_length+1);
+	} else {
+		if (cfg->port <= 0 || cfg->port > 65535) {
+			syslog(LOG_ERR, "Invalid port %d. (Valid port must be between 1, and 65535.)", cfg->port);
+			return -1;
+		}
+		struct addrinfo hints, *ainfo_root, *ainfo;
+		const size_t size = sprintf(NULL, "%d", cfg->port) + 1;
+		char *port_str = malloc(size);
+
+		sprintf(port_str, "%d", cfg->port);
+		memset(&hints, 0, sizeof(hints));
+
+		hints.ai_family = AF_UNSPEC;
+		hints.ai_socktype = SOCK_SEQPACKET;
+		/*hints.ai_protocol = IPPROTO_SCTP;*/
+		hints.ai_flags = AI_PASSIVE;
+
+		const int gai_ret = getaddrinfo(cfg->sock, port_str, &hints, &ainfo_root);
+		/* Did getaddrinfo fail? */
+		if (gai_ret) {
+			syslog(LOG_ERR, "getaddrinfo() failed for hostname %s. Reason: %s", cfg->sock, gai_strerror(gai_ret));
+			return -1;
+		}
+
+		/* TODO: Create sockets for all resolved addresses, instead of just the first. */
+		sockaddr_size = ainfo_root->ai_addrlen;
+		sock_addr.sa = *ainfo_root->ai_addr;
+
+		freeaddrinfo(ainfo_root);
+	}
+
 	/* Create a new listen socket. */
-	int fd = socket(sock_type, SOCK_SEQPACKET, 0);
+	int fd = socket(sock_addr.sa.sa_family, SOCK_SEQPACKET, 0);
 
-	/* TODO: Add rest of init code. */
+	/* Did we fail to create the listen socket? */
+	if (fd < 0) {
+		syslog(LOG_ERR, "Failed to create listen socket.");
+		return -1;
+	}
 
-	if (sock_type == AF_UNIX) {
+	/* Did we fail to bind the listen socket? */
+	if (bind(fd, &sock_addr.sa, sockaddr_size) < 0) {
+		syslog(LOG_ERR, "Failed to bind listen socket.");
+		return -1;
+	}
+
+	int one = 1;
+
+	/* Did we fail to enable SO_REUSEADDR? */
+	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) < 0) {
+		syslog(LOG_ERR, "Failed to enable SO_REUSEADDR.");
+		return -1;
+	}
 
+	/* Did we fail to listen to the socket? */
+	if (listen(fd, 20) < 0) {
+		syslog(LOG_ERR, "Failed to listen to socket.");
+		return -1;
 	}
 
+	syslog(LOG_INFO, "Successfully created socket descriptor %i for address %s.", fd, cfg->sock);
 	return fd;
 }
 
-- 
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