add possibility to log network communication
authorMichael Gernoth <michael@gernoth.net>
Thu, 29 May 2014 16:19:42 +0000 (18:19 +0200)
committerMichael Gernoth <michael@gernoth.net>
Thu, 29 May 2014 16:19:42 +0000 (18:19 +0200)
hmland.c

index 6dc2cac..6b89ece 100644 (file)
--- a/hmland.c
+++ b/hmland.c
@@ -25,6 +25,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdint.h>
+#include <stdarg.h>
 #include <string.h>
 #include <strings.h>
 #include <poll.h>
@@ -52,6 +53,7 @@ extern char *optarg;
 static int impersonate_hmlanif = 0;
 static int debug = 0;
 static int verbose = 0;
+static FILE *logfile = NULL;
 static int reboot_seconds = 0;
 static int reboot_at_hour = -1;
 static int reboot_at_minute = -1;
@@ -89,6 +91,48 @@ static void print_timestamp(FILE *f)
        fprintf(f, "%s.%06ld: ", ts, tv.tv_usec);
 }
 
+static void write_log(char *buf, int len, char *fmt, ...)
+{
+       va_list ap;
+       int i;
+
+       if ((!logfile) && (!verbose))
+               return;
+
+       if (logfile)
+               print_timestamp(logfile);
+       if (verbose)
+               print_timestamp(stdout);
+
+       if (fmt) {
+               if (logfile) {
+                       va_start(ap, fmt);
+                       vfprintf(logfile, fmt, ap);
+                       va_end(ap);
+               }
+               if (verbose) {
+                       va_start(ap, fmt);
+                       vprintf(fmt, ap);
+                       va_end(ap);
+               }
+       }
+
+       if (buf && len) {
+               for (i = 0; i < len; i++) {
+                       if (logfile)
+                               fprintf(logfile, "%c", buf[i]);
+                       if (verbose)
+                               printf("%c", buf[i]);
+               }
+               if (logfile)
+                       fprintf(logfile, "\n");
+               if (verbose)
+                       printf("\n");
+       }
+       if (logfile)
+               fflush(logfile);
+}
+
 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',
@@ -319,15 +363,7 @@ static int hmlan_format_out(uint8_t *buf, int buf_len, void *data)
                return 1;
        }
 
-       if (verbose) {
-               int i;
-
-               print_timestamp(stdout);
-               printf("LAN < ");
-               for (i = 0; i < outpos-out-2; i++)
-                       printf("%c", out[i]);
-               printf("\n");
-       }
+       write_log((char*)out, outpos-out-2, "LAN < ");
 
        w = write(fd, out, outpos-out);
        if (w <= 0) {
@@ -341,15 +377,7 @@ static int hmlan_format_out(uint8_t *buf, int buf_len, void *data)
                struct queued_rx *last_rx;
 
                while (curr_rx) {
-                       if (verbose) {
-                               int i;
-
-                               print_timestamp(stdout);
-                               printf("LAN < ");
-                               for (i = 0; i < curr_rx->len-2; i++)
-                                       printf("%c", curr_rx->rx[i]);
-                               printf("\n");
-                       }
+                       write_log(curr_rx->rx, curr_rx->len-2, "LAN < ");
 
                        w = write(fd, curr_rx->rx, curr_rx->len);
                        if (w <= 0) {
@@ -411,13 +439,7 @@ static int hmlan_parse_in(int fd, void *data)
                        if (last == 0)
                                continue;
 
-                       if (verbose) {
-                               print_timestamp(stdout);
-                               printf("LAN > ");
-                               for (i = 0; i < last; i++)
-                                       printf("%c", instart[i]);
-                               printf("\n");
-                       }
+                       write_log((char*)instart, last,  "LAN > ");
 
                        memset(out, 0, sizeof(out));
                        *outpos++ = *inpos++;
@@ -717,28 +739,22 @@ static int socket_server(char *iface, int port, int flags)
                /* FIXME: getnameinfo... */
                client_addr = ntohl(csin.sin_addr.s_addr);
 
-               if (verbose) {
-                       print_timestamp(stdout);
-                       printf("Client %d.%d.%d.%d connected!\n",
-                                       (client_addr & 0xff000000) >> 24,
-                                       (client_addr & 0x00ff0000) >> 16,
-                                       (client_addr & 0x0000ff00) >> 8,
-                                       (client_addr & 0x000000ff));
-               }
+               write_log(NULL, 0, "Client %d.%d.%d.%d connected!\n",
+                               (client_addr & 0xff000000) >> 24,
+                               (client_addr & 0x00ff0000) >> 16,
+                               (client_addr & 0x0000ff00) >> 8,
+                               (client_addr & 0x000000ff));
 
                comm(client, client, sock, flags);
 
                shutdown(client, SHUT_RDWR);
                close(client);
 
-               if (verbose) {
-                       print_timestamp(stdout);
-                       printf("Connection to %d.%d.%d.%d closed!\n",
-                                       (client_addr & 0xff000000) >> 24,
-                                       (client_addr & 0x00ff0000) >> 16,
-                                       (client_addr & 0x0000ff00) >> 8,
-                                       (client_addr & 0x000000ff));
-               }
+               write_log(NULL, 0, "Connection to %d.%d.%d.%d closed!\n",
+                               (client_addr & 0xff000000) >> 24,
+                               (client_addr & 0x00ff0000) >> 16,
+                               (client_addr & 0x0000ff00) >> 8,
+                               (client_addr & 0x000000ff));
                sleep(1);
        }
 
@@ -762,6 +778,7 @@ void hmlan_syntax(char *prog)
        fprintf(stderr, "\t-h\t\tthis help\n");
        fprintf(stderr, "\t-i\t\tinteractive mode (connect HM-CFG-USB to terminal)\n");
        fprintf(stderr, "\t-l ip\t\tlisten on given IP address only (for example 127.0.0.1)\n");
+       fprintf(stderr, "\t-L logfile\tlog network-communication to logfile\n");
        fprintf(stderr, "\t-P\t\tcreate PID file " PID_FILE " in daemon mode\n");
        fprintf(stderr, "\t-p n\t\tlisten on port n (default: 1000)\n");
        fprintf(stderr, "\t-r n\t\treboot HM-CFG-USB after n seconds (0: no reboot, default: %u if FW < 0.967, 0 otherwise)\n", DEFAULT_REBOOT_SECONDS);
@@ -780,7 +797,7 @@ int main(int argc, char **argv)
        char *ep;
        int opt;
        
-       while((opt = getopt(argc, argv, "DdhiPp:Rr:l:vV")) != -1) {
+       while((opt = getopt(argc, argv, "DdhiPp:Rr:l:L:vV")) != -1) {
                switch (opt) {
                        case 'D':
                                debug = 1;
@@ -828,6 +845,13 @@ int main(int argc, char **argv)
                        case 'l':
                                iface = optarg;
                                break;
+                       case 'L':
+                               logfile = fopen(optarg, "a");
+                               if (!logfile) {
+                                       perror("fopen(logfile)");
+                                       exit(EXIT_FAILURE);
+                               }
+                               break;
                        case 'v':
                                verbose = 1;
                                break;
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