Allow the user to specify the compiler via environment variable
[hmcfgusb] / hmland.c
index 6b89ece..35f8192 100644 (file)
--- a/hmland.c
+++ b/hmland.c
@@ -1,6 +1,6 @@
 /* HM-CFG-LAN emulation for HM-CFG-USB
  *
- * Copyright (c) 2013 Michael Gernoth <michael@gernoth.net>
+ * Copyright (c) 2013-16 Michael Gernoth <michael@gernoth.net>
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to
 #include "version.h"
 #include "hexdump.h"
 #include "hmcfgusb.h"
+#include "util.h"
 
 #define PID_FILE "/var/run/hmland.pid"
 
+#define POLL_TIMEOUT_MS                250     /* Wake up device/bus at least once every 250ms */
 #define DEFAULT_REBOOT_SECONDS 86400
+#define LAN_READ_CHUNK_SIZE    2048
+/* Don't allow remote clients to consume all of our memory */
+#define LAN_MAX_LINE_LENGTH    4096
+#define LAN_MAX_BUF_LENGTH     1048576
 
 extern char *optarg;
 
@@ -58,6 +64,9 @@ static int reboot_seconds = 0;
 static int reboot_at_hour = -1;
 static int reboot_at_minute = -1;
 static int reboot_set = 0;
+static uint8_t *lan_read_buf = NULL;
+static int lan_read_buflen = 0;
+static char *serial = NULL;
 
 struct queued_rx {
        char *rx;
@@ -91,7 +100,7 @@ static void print_timestamp(FILE *f)
        fprintf(f, "%s.%06ld: ", ts, tv.tv_usec);
 }
 
-static void write_log(char *buf, int len, char *fmt, ...)
+static void write_log(const char *buf, int len, const char *fmt, ...)
 {
        va_list ap;
        int i;
@@ -133,14 +142,12 @@ static void write_log(char *buf, int len, char *fmt, ...)
                fflush(logfile);
 }
 
-static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, int len, int flags)
+static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int outlen, size_t 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;
-       int i;
+       size_t i;
 
        if (flags & FLAG_COMMA_BEFORE) {
                CHECK_SPACE(1);
@@ -158,9 +165,9 @@ static int format_part_out(uint8_t **inpos, int inlen, uint8_t **outpos, int out
                CHECK_AVAIL(len);
                CHECK_SPACE(len*2);
                for (i = 0; i < len; i++) {
-                       **outpos = nibble[((**inpos) & 0xf0) >> 4];
+                       **outpos = nibble_to_ascii(((**inpos) & 0xf0) >> 4);
                        *outpos += 1;
-                       **outpos = nibble[((**inpos) & 0xf)];
+                       **outpos = nibble_to_ascii(((**inpos) & 0xf));
                        *inpos += 1; *outpos += 1;
                }
        } else {
@@ -188,21 +195,6 @@ 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;
@@ -210,7 +202,7 @@ static int parse_part_in(uint8_t **inpos, int inlen, uint8_t **outpos, int outle
        uint8_t *inend = *inpos + inlen;
 
        if (flags & FLAG_LENGTH_BYTE) {
-               int len = 0;
+               size_t len = 0;
                uint8_t *ip;
 
                ip = *inpos;
@@ -283,7 +275,12 @@ static int hmlan_format_out(uint8_t *buf, int buf_len, void *data)
                        format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
                        format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 3, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
                        format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 4, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
-                       format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
+                       if (version < 0x03c7) {
+                               format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
+                       } else {
+                               format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 2, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE);
+                               format_part_out(&inpos, (buf_len-(inpos-buf)), &outpos, (sizeof(out)-(outpos-out)), 1, FLAG_FORMAT_HEX | FLAG_COMMA_BEFORE | FLAG_NL);
+                       }
 
                        if (!reboot_set) {
                                int new_reboot_seconds;
@@ -398,72 +395,99 @@ static int hmlan_format_out(uint8_t *buf, int buf_len, void *data)
        return 1;
 }
 
-static int hmlan_parse_in(int fd, void *data)
+static int hmlan_parse_one(uint8_t *cmd, int last, void *data)
 {
        struct hmcfgusb_dev *dev = data;
-       uint8_t buf[1025];
        uint8_t out[0x40]; //FIXME!!!
        uint8_t *outpos;
-       uint8_t *inpos;
-       int i;
-       int last;
-       int r;
+       uint8_t *inpos = cmd;
 
-       memset(buf, 0, sizeof(buf));
+       outpos = out;
 
-       r = read(fd, buf, sizeof(buf)-1);
-       if (r > 0) {
-               uint8_t *inend = buf + r;
+       if (last == 0)
+               return 1;
 
-               inpos = buf;
+       write_log((char*)cmd, last,  "LAN > ");
 
-               while (inpos < inend) {
-                       uint8_t *instart = inpos;
+       memset(out, 0, sizeof(out));
+       *outpos++ = *inpos++;
+
+       switch(*cmd) {
+               case 'S':
+                       parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                       parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                       parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                       parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                       parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                       parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
+                       break;
+               case 'Y':
+                       parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                       parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                       parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
+                       break;
+               case '+':
+                       parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                       parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                       parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), 0);
+                       parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
+                       break;
+               default:
+                       parse_part_in(&inpos, (last-(inpos-cmd)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
+                       break;
+       }
 
-                       if ((*inpos == '\r') || (*inpos == '\n')) {
-                               inpos++;
-                               continue;
-                       }
-                       
-                       outpos = out;
+       hmcfgusb_send(dev, out, sizeof(out), 1);
 
-                       last = inend - inpos;
+       return 1;
+}
 
-                       for (i = 0; i < last; i++) {
-                               if ((inpos[i] == '\r') || (inpos[i] == '\n')) {
-                                       last = i;
+static int hmlan_parse_in(int fd, void *data)
+{
+       uint8_t *newbuf;
+       int r;
+       int i;
+
+       newbuf = realloc(lan_read_buf, lan_read_buflen + LAN_READ_CHUNK_SIZE);
+       if (!newbuf) {
+               perror("realloc");
+               return 0;
+       }
+       lan_read_buf = newbuf;
+       r = read(fd, lan_read_buf + lan_read_buflen, LAN_READ_CHUNK_SIZE);
+       if (r > 0) {
+               lan_read_buflen += r;
+               if (lan_read_buflen > LAN_MAX_BUF_LENGTH) {
+                       if (verbose)
+                               printf("Our buffer is bigger than %d bytes (%d bytes), closing connection!\n", LAN_MAX_BUF_LENGTH, lan_read_buflen);
+                       return -1;
+               }
+               while(lan_read_buflen > 0) {
+                       int found = 0;
+
+                       for (i = 0; i < lan_read_buflen; i++) {
+                               if ((lan_read_buf[i] == '\r') || (lan_read_buf[i] == '\n')) {
+                                       if (i > 0)
+                                               hmlan_parse_one(lan_read_buf, i, data);
+                                       memmove(lan_read_buf, lan_read_buf + i + 1, lan_read_buflen - (i + 1));
+                                       lan_read_buflen -= (i + 1);
+                                       found = 1;
                                        break;
                                }
+                               if (i > LAN_MAX_LINE_LENGTH) {
+                                       if (verbose)
+                                               printf("Client sent more than %d bytes without newline, closing connection!\n", LAN_MAX_LINE_LENGTH);
+                                       return -1;
+                               }
                        }
-
-                       if (last == 0)
-                               continue;
-
-                       write_log((char*)instart, last,  "LAN > ");
-
-                       memset(out, 0, sizeof(out));
-                       *outpos++ = *inpos++;
-
-                       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);
-                                       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);
-                                       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)), FLAG_LENGTH_BYTE);
-                                       break;
-                               case 'Y':
-                                       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);
-                                       parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_LENGTH_BYTE);
-                                       break;
-                               default:
-                                       parse_part_in(&inpos, (last-(inpos-instart)), &outpos, (sizeof(out)-(outpos-out)), FLAG_IGNORE_COMMAS);
-                                       break;
+                       if (!found)
+                               break;
+                       newbuf = realloc(lan_read_buf, lan_read_buflen);
+                       if (lan_read_buflen && !newbuf) {
+                               perror("realloc");
+                               return 0;
                        }
-
-                       hmcfgusb_send(dev, out, sizeof(out), 1);
+                       lan_read_buf = newbuf;
                }
        } else if (r < 0) {
                if (errno != ECONNRESET)
@@ -484,7 +508,7 @@ static int comm(int fd_in, int fd_out, int master_socket, int flags)
 
        hmcfgusb_set_debug(debug);
 
-       dev = hmcfgusb_init(hmlan_format_out, &fd_out);
+       dev = hmcfgusb_init(hmlan_format_out, &fd_out, serial);
        if (!dev) {
                fprintf(stderr, "Can't initialize HM-CFG-USB!\n");
                return 0;
@@ -550,7 +574,7 @@ static int comm(int fd_in, int fd_out, int master_socket, int flags)
        while(!quit) {
                int fd;
 
-               fd = hmcfgusb_poll(dev, 1000);  /* Wakeup device/bus at least once a second */
+               fd = hmcfgusb_poll(dev, POLL_TIMEOUT_MS);
                if (fd >= 0) {
                        if (fd == master_socket) {
                                int client;
@@ -630,7 +654,7 @@ static int socket_server(char *iface, int port, int flags)
                                                exit(EXIT_FAILURE);
                                        }
 
-                                       if (fscanf(pidfile, "%u", &old_pid) != 1) {
+                                       if (fscanf(pidfile, "%d", &old_pid) != 1) {
                                                fclose(pidfile);
                                                fprintf(stderr, "Can't read old PID from " PID_FILE ", already running?\n");
                                                exit(EXIT_FAILURE);
@@ -686,8 +710,6 @@ static int socket_server(char *iface, int port, int flags)
                exit(EXIT_FAILURE);
        }
 
-       impersonate_hmlanif = 1;
-
        sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
        if (sock == -1) {
                perror("Can't open socket");
@@ -750,6 +772,11 @@ static int socket_server(char *iface, int port, int flags)
                shutdown(client, SHUT_RDWR);
                close(client);
 
+               if (lan_read_buf)
+                       free(lan_read_buf);
+               lan_read_buf = NULL;
+               lan_read_buflen = 0;
+
                write_log(NULL, 0, "Connection to %d.%d.%d.%d closed!\n",
                                (client_addr & 0xff000000) >> 24,
                                (client_addr & 0x00ff0000) >> 16,
@@ -776,6 +803,7 @@ void hmlan_syntax(char *prog)
        fprintf(stderr, "\t-D\t\tdebug mode\n");
        fprintf(stderr, "\t-d\t\tdaemon mode\n");
        fprintf(stderr, "\t-h\t\tthis help\n");
+       fprintf(stderr, "\t-I\t\tpretend to be HM-LAN-IF for compatibility with client-software (previous default)\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");
@@ -783,6 +811,7 @@ void hmlan_syntax(char *prog)
        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);
        fprintf(stderr, "\t   hh:mm\treboot HM-CFG-USB daily at hh:mm\n");
+       fprintf(stderr, "\t-S serial\tuse HM-CFG-USB with given serial (for multiple hmland instances)\n");
        fprintf(stderr, "\t-v\t\tverbose mode\n");
        fprintf(stderr, "\t-V\t\tshow version (" VERSION ")\n");
 
@@ -797,7 +826,7 @@ int main(int argc, char **argv)
        char *ep;
        int opt;
        
-       while((opt = getopt(argc, argv, "DdhiPp:Rr:l:L:vV")) != -1) {
+       while((opt = getopt(argc, argv, "DdhIiPp:Rr:l:L:S:vV")) != -1) {
                switch (opt) {
                        case 'D':
                                debug = 1;
@@ -806,6 +835,9 @@ int main(int argc, char **argv)
                        case 'd':
                                flags |= FLAG_DAEMON;
                                break;
+                       case 'I':
+                               impersonate_hmlanif = 1;
+                               break;
                        case 'i':
                                interactive = 1;
                                break;
@@ -852,12 +884,15 @@ int main(int argc, char **argv)
                                        exit(EXIT_FAILURE);
                                }
                                break;
+                       case 'S':
+                               serial = optarg;
+                               break;
                        case 'v':
                                verbose = 1;
                                break;
                        case 'V':
                                printf("hmland " VERSION "\n");
-                               printf("Copyright (c) 2013 Michael Gernoth\n\n");
+                               printf("Copyright (c) 2013-16 Michael Gernoth\n\n");
                                exit(EXIT_SUCCESS);
                        case 'h':
                        case ':':
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