X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/hmcfgusb/blobdiff_plain/e2572b0617ca5946d944d10051b2d16e8dcb4a68..4a8a2269f615db1d1e98e2214fea8c93bca4f7a5:/hmland.c

diff --git a/hmland.c b/hmland.c
index 8e5a8e9..c3981ab 100644
--- a/hmland.c
+++ b/hmland.c
@@ -1,4 +1,4 @@
-/* HM-CFG-LAN emuldation for HM-CFG-USB
+/* HM-CFG-LAN emulation for HM-CFG-USB
  *
  * Copyright (c) 2013 Michael Gernoth <michael@gernoth.net>
  *
@@ -28,6 +28,7 @@
 #include <string.h>
 #include <strings.h>
 #include <poll.h>
+#include <signal.h>
 #include <errno.h>
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -56,6 +57,8 @@ static int verbose = 0;
 
 static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int len, int flags)
 {
+	const uint8_t nibble[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+		'A', 'B', 'C', 'D', 'E', 'F'};
 	uint8_t *buf_out = *outpos;
 	uint8_t *outend = *outpos + outlen;
 	uint8_t *inend = *inpos + inlen;
@@ -74,20 +77,13 @@ static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int out
 	}
 
 	if (flags & FLAG_FORMAT_HEX) {
-		char hex[3];
-
-		memset(hex, 0, sizeof(hex));
-
 		CHECK_AVAIL(len);
 		CHECK_SPACE(len*2);
 		for (i = 0; i < len; i++) {
-			if (snprintf(hex, sizeof(hex), "%02X", **inpos) != 2) {
-				fprintf(stderr, "Can't format hex-string!\n");
-				return 0;
-			}
-			*inpos += 1;
-			memcpy(*outpos, hex, 2);
-			*outpos += 2;
+			**outpos = nibble[((**inpos) & 0xf0) >> 4];
+			*outpos += 1;
+			**outpos = nibble[((**inpos) & 0xf)];
+			*inpos += 1; *outpos += 1;
 		}
 	} else {
 		CHECK_AVAIL(len);
@@ -114,14 +110,26 @@ static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int out
 	return *outpos - buf_out;
 }
 
+static uint8_t ascii_to_nibble(uint8_t a)
+{
+	uint8_t c = 0x00;
+
+	if ((a >= '0') && (a <= '9')) {
+		c = a - '0';
+	} else if ((a >= 'A') && (a <= 'F')) {
+		c = (a - 'A') + 10;
+	} else if ((a >= 'a') && (a <= 'f')) {
+		c = (a - 'a') + 10;
+	}
+
+	return c;
+}
+
 static int parse_part_in(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int flags)
 {
 	uint8_t *buf_out = *outpos;
 	uint8_t *outend = *outpos + outlen;
 	uint8_t *inend = *inpos + inlen;
-	char hex[3];
-
-	memset(hex, 0, sizeof(hex));
 
 	if (flags & FLAG_LENGTH_BYTE) {
 		int len = 0;
@@ -155,25 +163,26 @@ static int parse_part_in(uint8_t **inpos, int inlen, uint8_t **outpos, int outle
 
 		CHECK_SPACE(1);
 		CHECK_AVAIL(2);
-		memcpy(hex, *inpos, 2);
-		*inpos += 2;
 
-		**outpos = strtoul(hex, NULL, 16);
-		*outpos += 1;
+		**outpos = ascii_to_nibble(**inpos) << 4;
+		*inpos += 1;
+		**outpos |= ascii_to_nibble(**inpos);
+		*inpos += 1; *outpos += 1;
 	}
 
 	return *outpos - buf_out;
 }
 
-static void hmlan_format_out(uint8_t *buf, int buf_len, void *data)
+static int hmlan_format_out(uint8_t *buf, int buf_len, void *data)
 {
 	uint8_t out[1024];
 	uint8_t *outpos;
 	uint8_t *inpos;
 	int fd = *((int*)data);
+	int w;
 
 	if (buf_len < 1)
-		return;
+		return 1;
 
 	memset(out, 0, sizeof(out));
 	outpos = out;
@@ -226,9 +235,16 @@ static void hmlan_format_out(uint8_t *buf, int buf_len, void *data)
 			hexdump(buf, buf_len, "Unknown> ");
 			break;
 	}
-	write(fd, out, outpos-out);
 	if (debug)
 		fprintf(stderr, "LAN < %s\n", out);
+
+	w = write(fd, out, outpos-out);
+	if (w <= 0) {
+		perror("write");
+		return 0;
+	}
+
+	return 1;
 }
 
 static int hmlan_parse_in(int fd, void *data)
@@ -363,8 +379,9 @@ static int comm(int fd_in, int fd_out, int master_socket)
 	return 1;
 }
 
-static int socket_server(int port, int daemon)
+static int socket_server(char *iface, int port, int daemon)
 {
+	struct sigaction sact;
 	struct sockaddr_in sin;
 	int sock;
 	int n;
@@ -381,6 +398,14 @@ static int socket_server(int port, int daemon)
 		}
 	}
 
+	memset(&sact, 0, sizeof(sact));
+	sact.sa_handler = SIG_IGN;
+
+	if (sigaction(SIGPIPE, &sact, NULL) == -1) {
+		perror("sigaction");
+		exit(EXIT_FAILURE);
+	}
+
 	impersonate_hmlanif = 1;
 
 	sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
@@ -398,7 +423,14 @@ static int socket_server(int port, int daemon)
 	memset(&sin, 0, sizeof(sin));
 	sin.sin_family = AF_INET;
 	sin.sin_port = htons(port);
-	sin.sin_addr.s_addr = htonl(INADDR_ANY);
+	if (!iface) {
+		sin.sin_addr.s_addr = htonl(INADDR_ANY);
+	} else {
+		if (inet_pton(AF_INET, iface, &(sin.sin_addr.s_addr)) != 1) {
+			perror("inet_ntop");
+			return EXIT_FAILURE;
+		}
+	}
 
 	if (bind(sock, (struct sockaddr*)&sin, sizeof(sin)) == -1) {
 		perror("Can't bind socket");
@@ -469,6 +501,7 @@ void hmlan_syntax(char *prog)
 	fprintf(stderr, "\t-d\tdaemon mode\n");
 	fprintf(stderr, "\t-h\tthis help\n");
 	fprintf(stderr, "\t-i\tinteractive mode (connect HM-CFG-USB to terminal)\n");
+	fprintf(stderr, "\t-l ip\tlisten on given IP address only (for example 127.0.0.1)\n");
 	fprintf(stderr, "\t-p n\tlisten on port n (default 1000)\n");
 	fprintf(stderr, "\t-v\tverbose mode\n");
 
@@ -477,12 +510,13 @@ void hmlan_syntax(char *prog)
 int main(int argc, char **argv)
 {
 	int port = 1000;
+	char *iface = NULL;
 	int interactive = 0;
 	int daemon = 0;
 	char *ep;
 	int opt;
 
-	while((opt = getopt(argc, argv, "Ddhip:v")) != -1) {
+	while((opt = getopt(argc, argv, "Ddhip:l:v")) != -1) {
 		switch (opt) {
 			case 'D':
 				debug = 1;
@@ -501,6 +535,9 @@ int main(int argc, char **argv)
 					exit(EXIT_FAILURE);
 				}
 				break;
+			case 'l':
+				iface = optarg;
+				break;
 			case 'v':
 				verbose = 1;
 				break;
@@ -517,6 +554,6 @@ int main(int argc, char **argv)
 	if (interactive) {
 		return interactive_server();
 	} else {
-		return socket_server(port, daemon);
+		return socket_server(iface, port, daemon);
 	}
 }