new is_unix field to create listen unix sockets

ChangeLog

@@ -1,3 +1,10 @@
+vNEXT:
+	Added a boolean setting "is_unix" for listen and
+	protocol entries. This will use the 'host' setting
+	as a path name to a socket file, and connections
+	(listening or connecting) will be performed on Unix
+	socket instead of Internet sockets.
+
 v2.1.3:
 	Fix Landlock access to /etc/hosts.deny and
 	/etc/hosts.allow.

common.c

@@ -178,6 +178,7 @@ static int start_listen_inet(struct listen_endpoint *sockfd[], int num_addr, str
         *sockfd = realloc(*sockfd, num_addr * sizeof(*sockfd[0]));
         (*sockfd)[num_addr-1].socketfd = listen_single_addr(addr, cfg->keepalive, cfg->is_udp);
         (*sockfd)[num_addr-1].type = cfg->is_udp ? SOCK_DGRAM : SOCK_STREAM;
+        (*sockfd)[num_addr-1].family = AF_INET;
         print_message(msg_config, "%d:\t%s\t[%s] [%s]\n", (*sockfd)[num_addr-1].socketfd, sprintaddr(buf, sizeof(buf), addr),
                       cfg->keepalive ? "keepalive" : "",
                       cfg->is_udp ? "udp" : "");
@@ -186,6 +187,31 @@ static int start_listen_inet(struct listen_endpoint *sockfd[], int num_addr, str
     return num_addr;
 }
 
+/* Same, but for UNIX sockets */
+static int start_listen_unix(struct listen_endpoint *sockfd[], int num_addr, struct sslhcfg_listen_item* cfg)
+{
+    int fd = socket(AF_UNIX, cfg->is_udp ? SOCK_DGRAM : SOCK_STREAM, 0);
+    CHECK_RES_DIE(fd, "socket(AF_UNIX)");
+
+    struct sockaddr_un sun;
+    sun.sun_family = AF_UNIX;
+    strncpy(sun.sun_path, cfg->host, sizeof(sun.sun_path)-1);
+    printf("binding [%s]\n", sun.sun_path);
+    int res = bind(fd, (struct sockaddr*)&sun, sizeof(sun));
+    CHECK_RES_DIE(res, "bind(AF_UNIX)");
+
+    res = listen(fd, 50);
+
+    num_addr++;
+    *sockfd = realloc(*sockfd, num_addr * sizeof(*sockfd[0]));
+    (*sockfd)[num_addr-1].socketfd = fd;
+    (*sockfd)[num_addr-1].type = cfg->is_udp ? SOCK_DGRAM : SOCK_STREAM;
+    (*sockfd)[num_addr-1].family = AF_INET;
+
+    return num_addr;
+}
+
+
 /* Starts listening sockets on specified addresses.
  * OUT: *sockfd[]  pointer to newly-allocated array of listen_endpoint objects
  * Returns number of addresses bound
@@ -206,7 +232,11 @@ int start_listen_sockets(struct listen_endpoint *sockfd[])
     print_message(msg_config, "Listening to:\n");
 
     for (i = 0; i < cfg.listen_len; i++) {
-        num_addr = start_listen_inet(sockfd, num_addr, &cfg.listen[i]);
+        if (cfg.listen[i].is_unix) {
+            num_addr = start_listen_unix(sockfd, num_addr, &cfg.listen[i]);
+        } else {
+            num_addr = start_listen_inet(sockfd, num_addr, &cfg.listen[i]);
+        }
     }
 
     return num_addr;
@@ -425,7 +455,7 @@ static int connect_unix(struct connection *cnx, int fd_from, connect_blocking bl
 
     int fd = socket(AF_UNIX, SOCK_STREAM, 0);
     sun->sun_family = AF_UNIX;
-    strcpy(sun->sun_path, cnx->proto->host);
+    strncpy(sun->sun_path, cnx->proto->host, sizeof(sun->sun_path)-1);
 
     int res = connect(fd, (struct sockaddr*)sun, sizeof(*sun));
     CHECK_RES_RETURN(res, "connect", res);
@@ -588,6 +618,9 @@ char* sprintaddr(char* buf, size_t size, struct addrinfo *a)
    char host[NI_MAXHOST], serv[NI_MAXSERV];
    int res;
 
+   memset(host, 0, sizeof(host));
+   memset(serv, 0, sizeof(serv));
+
    res = getnameinfo(a->ai_addr, a->ai_addrlen,
                host, sizeof(host),
                serv, sizeof(serv),

common.h

@@ -132,6 +132,7 @@ struct connection {
 struct listen_endpoint {
     int socketfd;       /* file descriptor of listening socket */
     int type;           /* SOCK_DGRAM | SOCK_STREAM */
+    int family;         /* AF_INET | AF_UNIX */
 };
 
 #define FD_CNXCLOSED    0

echosrv-conf.c

@@ -1,5 +1,5 @@
 /* Generated by conf2struct (https://www.rutschle.net/tech/conf2struct/README)
- * on Sun Dec 22 00:05:31 2024. 
+ * on Sun Dec 22 22:40:51 2024. 
 
 # conf2struct: generate libconf parsers that read to structs
 # Copyright (C) 2018-2024  Yves Rutschle

echosrv-conf.h

@@ -1,5 +1,5 @@
 /* Generated by conf2struct (https://www.rutschle.net/tech/conf2struct/README)
- * on Sun Dec 22 00:05:31 2024. 
+ * on Sun Dec 22 22:40:51 2024. 
 
 # conf2struct: generate libconf parsers that read to structs
 # Copyright (C) 2018-2024  Yves Rutschle

example.cfg

@@ -53,7 +53,8 @@ listen:
 (
     { host: "thelonious"; port: "443"; },
     { host: "thelonious"; port: "8080"; keepalive: true; },
-    { host: "thelonious"; is_udp: true; port: "443" }
+    { host: "thelonious"; is_udp: true; port: "443"; },
+    { host: "/tmp/unix_socket"; is_unix: true; port: ""; }
 );
 
 # List of protocols

sslh-conf.c

@@ -1,5 +1,5 @@
 /* Generated by conf2struct (https://www.rutschle.net/tech/conf2struct/README)
- * on Sun Dec 22 16:13:50 2024. 
+ * on Sun Dec 22 22:40:51 2024. 
 
 # conf2struct: generate libconf parsers that read to structs
 # Copyright (C) 2018-2024  Yves Rutschle
@@ -777,7 +777,7 @@ static struct config_desc table_sslhcfg_protocols[] = {
         },
 	{ 0 }
 };
-                                             
+                                                      
 static struct config_desc table_sslhcfg_listen[] = {
 
 
@@ -829,6 +829,22 @@ static struct config_desc table_sslhcfg_listen[] = {
             /* default_val*/    .default_val.def_bool = 0 
         },
 
+        { 
+            /* name */          "is_unix", 
+            /* type */          CFG_BOOL, 
+            /* sub_group*/      NULL,
+            /* arg_cl */        NULL,
+            /* base_addr */     NULL,
+            /* offset */        offsetof(struct sslhcfg_listen_item, is_unix),
+            /* offset_len */    0,
+            /* offset_present */ 0,
+            /* size */          sizeof(int), 
+            /* array_type */    -1,
+            /* mandatory */     0, 
+            /* optional */      0, 
+            /* default_val*/    .default_val.def_bool = 0 
+        },
+
         { 
             /* name */          "keepalive", 
             /* type */          CFG_BOOL, 
@@ -2429,6 +2445,9 @@ static void sslhcfg_listen_fprint(
         fprintf(out, "is_udp: %d", sslhcfg_listen->is_udp);
         fprintf(out, "\n");
         indent(out, depth);
+        fprintf(out, "is_unix: %d", sslhcfg_listen->is_unix);
+        fprintf(out, "\n");
+        indent(out, depth);
         fprintf(out, "keepalive: %d", sslhcfg_listen->keepalive);
         fprintf(out, "\n");
 }

sslh-conf.h

@@ -1,5 +1,5 @@
 /* Generated by conf2struct (https://www.rutschle.net/tech/conf2struct/README)
- * on Sun Dec 22 16:13:50 2024. 
+ * on Sun Dec 22 22:40:51 2024. 
 
 # conf2struct: generate libconf parsers that read to structs
 # Copyright (C) 2018-2024  Yves Rutschle
@@ -44,6 +44,7 @@ struct sslhcfg_listen_item {
 	char*	host;
 	char*	port;
 	int	is_udp;
+	int	is_unix;
 	int	keepalive;
 };
 

sslhconf.cfg

@@ -98,6 +98,7 @@ config: {
                     { name: "host"; type: "string"; var: true; },
                     { name: "port"; type: "string"; var: true; },
                     { name: "is_udp"; type: "bool"; default: false },
+                    { name: "is_unix"; type: "bool"; default: false },
                     { name: "keepalive"; type: "bool"; default: false; }
                 )
             },

test.cfg

@@ -32,7 +32,8 @@ listen:
 (
     { host: "localhost"; port: "8080"; keepalive: true; },
     { host: "localhost"; port: "8081"; keepalive: true; },
-    { host: "ip4-localhost"; is_udp: true; port: "8086"; }
+    { host: "ip4-localhost"; is_udp: true; port: "8086"; },
+    { host: "/tmp/sslh.sock"; is_unix: true; port: ""; }
 );
 
 

version.h

@@ -1,5 +1,5 @@
 #ifndef VERSION_H 
 #define VERSION_H 
 
-#define VERSION "v2.1.4-22-g9e6b4fa-dirty"
+#define VERSION "v2.1.4-24-g59d89e3-dirty"
 #endif