-/* HM-CFG-LAN emuldation for HM-CFG-USB
+/* HM-CFG-LAN emulation for HM-CFG-USB
*
* Copyright (c) 2013 Michael Gernoth <michael@gernoth.net>
*
#include <string.h>
#include <strings.h>
#include <poll.h>
+#include <signal.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
+#include <sys/stat.h>
+#include <fcntl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <libusb-1.0/libusb.h>
#include "hexdump.h"
#include "hmcfgusb.h"
+#define PID_FILE "/var/run/hmland.pid"
+
extern char *optarg;
static int impersonate_hmlanif = 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;
}
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);
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;
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;
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)
inpos = buf;
if (debug)
- fprintf(stderr, "LAN > %s\n", buf);
+ fprintf(stderr, "\nLAN > %s", buf);
while (inpos < inend) {
uint8_t *instart = inpos;
memset(out, 0, sizeof(out));
*outpos++ = *inpos++;
- switch(buf[0]) {
+ switch(*instart) {
case 'S':
parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), 0);
return 1;
}
-static int socket_server(int port, int daemon)
+void sigterm_handler(int sig)
{
+ if (unlink(PID_FILE) == -1)
+ perror("Can't remove PID file");
+
+ exit(EXIT_SUCCESS);
+}
+
+#define FLAG_DAEMON (1 << 0)
+#define FLAG_PID_FILE (1 << 1)
+
+static int socket_server(char *iface, int port, int flags)
+{
+ struct sigaction sact;
struct sockaddr_in sin;
int sock;
int n;
pid_t pid;
- if (daemon) {
+ if (flags & FLAG_DAEMON) {
+ FILE *pidfile = NULL;
+
+ if (flags & FLAG_PID_FILE) {
+ int fd;
+
+ fd = open(PID_FILE, O_CREAT | O_EXCL | O_WRONLY, 0644);
+ if (fd == -1) {
+ if (errno == EEXIST) {
+ pid_t old_pid;
+ pidfile = fopen(PID_FILE, "r");
+ if (!pidfile) {
+ perror("PID file " PID_FILE " already exists, already running?");
+ exit(EXIT_FAILURE);
+ }
+
+ if (fscanf(pidfile, "%u", &old_pid) != 1) {
+ fclose(pidfile);
+ fprintf(stderr, "Can't read old PID from " PID_FILE ", already running?\n");
+ exit(EXIT_FAILURE);
+ }
+
+ fclose(pidfile);
+
+ fprintf(stderr, "Already running with PID %u according to " PID_FILE "!\n", old_pid);
+ exit(EXIT_FAILURE);
+ }
+ perror("Can't create PID file " PID_FILE);
+ exit(EXIT_FAILURE);
+ }
+
+ pidfile = fdopen(fd, "w");
+ if (!pidfile) {
+ perror("Can't reopen PID file fd");
+ exit(EXIT_FAILURE);
+ }
+
+ memset(&sact, 0, sizeof(sact));
+ sact.sa_handler = sigterm_handler;
+
+ if (sigaction(SIGTERM, &sact, NULL) == -1) {
+ perror("sigaction(SIGTERM)");
+ exit(EXIT_FAILURE);
+ }
+ }
+
pid = fork();
if (pid > 0) {
+ if (pidfile) {
+ fprintf(pidfile, "%u\n", pid);
+ fclose(pidfile);
+ }
+
printf("Daemon with PID %u started!\n", pid);
exit(EXIT_SUCCESS);
} else if (pid < 0) {
perror("fork");
exit(EXIT_FAILURE);
}
+
+ if (pidfile)
+ fclose(pidfile);
+ }
+
+ memset(&sact, 0, sizeof(sact));
+ sact.sa_handler = SIG_IGN;
+
+ if (sigaction(SIGPIPE, &sact, NULL) == -1) {
+ perror("sigaction(SIGPIPE)");
+ exit(EXIT_FAILURE);
}
impersonate_hmlanif = 1;
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");
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\tcreate PID file " PID_FILE " in daemon mode\n");
fprintf(stderr, "\t-p n\tlisten on port n (default 1000)\n");
fprintf(stderr, "\t-v\tverbose mode\n");
int main(int argc, char **argv)
{
int port = 1000;
+ char *iface = NULL;
int interactive = 0;
- int daemon = 0;
+ int flags = 0;
char *ep;
int opt;
- while((opt = getopt(argc, argv, "Ddhip:v")) != -1) {
+ while((opt = getopt(argc, argv, "DdhiPp:l:v")) != -1) {
switch (opt) {
case 'D':
debug = 1;
verbose = 1;
break;
case 'd':
- daemon = 1;
+ flags |= FLAG_DAEMON;
break;
case 'i':
interactive = 1;
break;
+ case 'P':
+ flags |= FLAG_PID_FILE;
+ break;
case 'p':
port = strtoul(optarg, &ep, 10);
if (*ep != '\0') {
exit(EXIT_FAILURE);
}
break;
+ case 'l':
+ iface = optarg;
+ break;
case 'v':
verbose = 1;
break;
if (interactive) {
return interactive_server();
} else {
- return socket_server(port, daemon);
+ return socket_server(iface, port, flags);
}
}
projects / hmcfgusb / blobdiff