git.distorted.org.uk Git - u/mdw/putty/blob - logging.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <ctype.h>
   4
   5 #include <time.h>
   6 #include <assert.h>
   7
   8 #include "putty.h"
   9
  10 /* log session to file stuff ... */
  11 struct LogContext {
  12     FILE *lgfp;
  13     Filename currlogfilename;
  14     void *frontend;
  15     Config cfg;
  16 };
  17
  18 static void xlatlognam(Filename *d, Filename s, char *hostname, struct tm *tm);
  19
  20 /*
  21  * Log session traffic.
  22  */
  23 void logtraffic(void *handle, unsigned char c, int logmode)
  24 {
  25     struct LogContext *ctx = (struct LogContext *)handle;
  26     if (ctx->cfg.logtype > 0) {
  27         if (ctx->cfg.logtype == logmode) {
  28             /* deferred open file from pgm start? */
  29             if (!ctx->lgfp)
  30                 logfopen(ctx);
  31             if (ctx->lgfp)
  32                 fputc(c, ctx->lgfp);
  33         }
  34     }
  35 }
  36
  37 /*
  38  * Flush any open log file.
  39  */
  40 void logflush(void *handle) {
  41     struct LogContext *ctx = (struct LogContext *)handle;
  42     if (ctx->cfg.logtype > 0)
  43         if (ctx->lgfp)
  44             fflush(ctx->lgfp);
  45 }
  46
  47 /*
  48  * Log an Event Log entry. Used in SSH packet logging mode; this is
  49  * also as convenient a place as any to put the output of Event Log
  50  * entries to stderr when a command-line tool is in verbose mode.
  51  * (In particular, this is a better place to put it than in the
  52  * front ends, because it only has to be done once for all
  53  * platforms. Platforms which don't have a meaningful stderr can
  54  * just avoid defining FLAG_STDERR.
  55  */
  56 void log_eventlog(void *handle, const char *event)
  57 {
  58     struct LogContext *ctx = (struct LogContext *)handle;
  59     if ((flags & FLAG_STDERR) && (flags & FLAG_VERBOSE)) {
  60         fprintf(stderr, "%s\n", event);
  61         fflush(stderr);
  62     }
  63     if (ctx->cfg.logtype != LGTYP_PACKETS)
  64         return;
  65     if (!ctx->lgfp)
  66         logfopen(ctx);
  67     if (ctx->lgfp)
  68         fprintf(ctx->lgfp, "Event Log: %s\r\n", event);
  69 }
  70
  71 /*
  72  * Log an SSH packet.
  73  * If n_blanks != 0, blank or omit some parts.
  74  * Set of blanking areas must be in increasing order.
  75  */
  76 void log_packet(void *handle, int direction, int type,
  77                 char *texttype, void *data, int len,
  78                 int n_blanks, const struct logblank_t *blanks)
  79 {
  80     struct LogContext *ctx = (struct LogContext *)handle;
  81     char dumpdata[80], smalldata[5];
  82
  83     if (ctx->cfg.logtype != LGTYP_PACKETS)
  84         return;
  85     if (!ctx->lgfp)
  86         logfopen(ctx);
  87     if (ctx->lgfp) {
  88         int p = 0, b = 0, omitted = 0;
  89         int output_pos = 0; /* NZ if pending output in dumpdata */
  90
  91         /* Packet header. */
  92         fprintf(ctx->lgfp, "%s packet type %d / 0x%02x (%s)\r\n",
  93                 direction == PKT_INCOMING ? "Incoming" : "Outgoing",
  94                 type, type, texttype);
  95
  96         /*
  97          * Output a hex/ASCII dump of the packet body, blanking/omitting
  98          * parts as specified.
  99          */
 100         while (p < len) {
 101             int blktype;
 102
 103             /* Move to a current entry in the blanking array. */
 104             while ((b < n_blanks) &&
 105                    (p >= blanks[b].offset + blanks[b].len))
 106                 b++;
 107             /* Work out what type of blanking to apply to
 108              * this byte. */
 109             blktype = PKTLOG_EMIT; /* default */
 110             if ((b < n_blanks) &&
 111                 (p >= blanks[b].offset) &&
 112                 (p < blanks[b].offset + blanks[b].len))
 113                 blktype = blanks[b].type;
 114
 115             /* If we're about to stop omitting, it's time to say how
 116              * much we omitted. */
 117             if ((blktype != PKTLOG_OMIT) && omitted) {
 118                 fprintf(ctx->lgfp, "  (%d byte%s omitted)\r\n",
 119                         omitted, (omitted==1?"":"s"));
 120                 omitted = 0;
 121             }
 122
 123             /* (Re-)initialise dumpdata as necessary
 124              * (start of row, or if we've just stopped omitting) */
 125             if (!output_pos && !omitted)
 126                 sprintf(dumpdata, "  %08x%*s\r\n", p-(p%16), 1+3*16+2+16, "");
 127
 128             /* Deal with the current byte. */
 129             if (blktype == PKTLOG_OMIT) {
 130                 omitted++;
 131             } else {
 132                 int c;
 133                 if (blktype == PKTLOG_BLANK) {
 134                     c = 'X';
 135                     sprintf(smalldata, "XX");
 136                 } else {  /* PKTLOG_EMIT */
 137                     c = ((unsigned char *)data)[p];
 138                     sprintf(smalldata, "%02x", c);
 139                 }
 140                 dumpdata[10+2+3*(p%16)] = smalldata[0];
 141                 dumpdata[10+2+3*(p%16)+1] = smalldata[1];
 142                 dumpdata[10+1+3*16+2+(p%16)] = (isprint(c) ? c : '.');
 143                 output_pos = (p%16) + 1;
 144             }
 145
 146             p++;
 147
 148             /* Flush row if necessary */
 149             if (((p % 16) == 0) || (p == len) || omitted) {
 150                 if (output_pos) {
 151                     strcpy(dumpdata + 10+1+3*16+2+output_pos, "\r\n");
 152                     fputs(dumpdata, ctx->lgfp);
 153                     output_pos = 0;
 154                 }
 155             }
 156
 157         }
 158
 159         /* Tidy up */
 160         if (omitted)
 161             fprintf(ctx->lgfp, "  (%d byte%s omitted)\r\n",
 162                     omitted, (omitted==1?"":"s"));
 163         fflush(ctx->lgfp);
 164     }
 165 }
 166
 167 /* open log file append/overwrite mode */
 168 void logfopen(void *handle)
 169 {
 170     struct LogContext *ctx = (struct LogContext *)handle;
 171     char buf[256];
 172     struct tm tm;
 173     char writemod[4];
 174
 175     /* Prevent repeat calls */
 176     if (ctx->lgfp)
 177         return;
 178
 179     if (!ctx->cfg.logtype)
 180         return;
 181     sprintf(writemod, "wb");           /* default to rewrite */
 182
 183     tm = ltime();
 184
 185     /* substitute special codes in file name */
 186     xlatlognam(&ctx->currlogfilename, ctx->cfg.logfilename,ctx->cfg.host, &tm);
 187
 188     ctx->lgfp = f_open(ctx->currlogfilename, "r");  /* file already present? */
 189     if (ctx->lgfp) {
 190         int i;
 191         fclose(ctx->lgfp);
 192         if (ctx->cfg.logxfovr != LGXF_ASK) {
 193             i = ((ctx->cfg.logxfovr == LGXF_OVR) ? 2 : 1);
 194         } else
 195             i = askappend(ctx->frontend, ctx->currlogfilename);
 196         if (i == 1)
 197             writemod[0] = 'a';         /* set append mode */
 198         else if (i == 0) {             /* cancelled */
 199             ctx->lgfp = NULL;
 200             ctx->cfg.logtype = 0;              /* disable logging */
 201             return;
 202         }
 203     }
 204
 205     ctx->lgfp = f_open(ctx->currlogfilename, writemod);
 206     if (ctx->lgfp) {                           /* enter into event log */
 207         /* --- write header line into log file */
 208         fputs("=~=~=~=~=~=~=~=~=~=~=~= PuTTY log ", ctx->lgfp);
 209         strftime(buf, 24, "%Y.%m.%d %H:%M:%S", &tm);
 210         fputs(buf, ctx->lgfp);
 211         fputs(" =~=~=~=~=~=~=~=~=~=~=~=\r\n", ctx->lgfp);
 212
 213         sprintf(buf, "%s session log (%s mode) to file: ",
 214                 (writemod[0] == 'a') ? "Appending" : "Writing new",
 215                 (ctx->cfg.logtype == LGTYP_ASCII ? "ASCII" :
 216                  ctx->cfg.logtype == LGTYP_DEBUG ? "raw" :
 217                  ctx->cfg.logtype == LGTYP_PACKETS ? "SSH packets" : "<ukwn>"));
 218         /* Make sure we do not exceed the output buffer size */
 219         strncat(buf, filename_to_str(&ctx->currlogfilename), 128);
 220         buf[strlen(buf)] = '\0';
 221         logevent(ctx->frontend, buf);
 222     }
 223 }
 224
 225 void logfclose(void *handle)
 226 {
 227     struct LogContext *ctx = (struct LogContext *)handle;
 228     if (ctx->lgfp) {
 229         fclose(ctx->lgfp);
 230         ctx->lgfp = NULL;
 231     }
 232 }
 233
 234 void *log_init(void *frontend, Config *cfg)
 235 {
 236     struct LogContext *ctx = snew(struct LogContext);
 237     ctx->lgfp = NULL;
 238     ctx->frontend = frontend;
 239     ctx->cfg = *cfg;                   /* STRUCTURE COPY */
 240     return ctx;
 241 }
 242
 243 void log_free(void *handle)
 244 {
 245     struct LogContext *ctx = (struct LogContext *)handle;
 246
 247     logfclose(ctx);
 248     sfree(ctx);
 249 }
 250
 251 void log_reconfig(void *handle, Config *cfg)
 252 {
 253     struct LogContext *ctx = (struct LogContext *)handle;
 254     int reset_logging;
 255
 256     if (!filename_equal(ctx->cfg.logfilename, cfg->logfilename) ||
 257         ctx->cfg.logtype != cfg->logtype)
 258         reset_logging = TRUE;
 259     else
 260         reset_logging = FALSE;
 261
 262     if (reset_logging)
 263         logfclose(ctx);
 264
 265     ctx->cfg = *cfg;                   /* STRUCTURE COPY */
 266
 267     if (reset_logging)
 268         logfopen(ctx);
 269 }
 270
 271 /*
 272  * translate format codes into time/date strings
 273  * and insert them into log file name
 274  *
 275  * "&Y":YYYY   "&m":MM   "&d":DD   "&T":hhmm   "&h":<hostname>   "&&":&
 276  */
 277 static void xlatlognam(Filename *dest, Filename src,
 278                        char *hostname, struct tm *tm) {
 279     char buf[10], *bufp;
 280     int size;
 281     char buffer[FILENAME_MAX];
 282     int len = sizeof(buffer)-1;
 283     char *d;
 284     const char *s;
 285
 286     d = buffer;
 287     s = filename_to_str(&src);
 288
 289     while (*s) {
 290         /* Let (bufp, len) be the string to append. */
 291         bufp = buf;                    /* don't usually override this */
 292         if (*s == '&') {
 293             char c;
 294             s++;
 295             size = 0;
 296             if (*s) switch (c = *s++, tolower(c)) {
 297               case 'y':
 298                 size = strftime(buf, sizeof(buf), "%Y", tm);
 299                 break;
 300               case 'm':
 301                 size = strftime(buf, sizeof(buf), "%m", tm);
 302                 break;
 303               case 'd':
 304                 size = strftime(buf, sizeof(buf), "%d", tm);
 305                 break;
 306               case 't':
 307                 size = strftime(buf, sizeof(buf), "%H%M%S", tm);
 308                 break;
 309               case 'h':
 310                 bufp = hostname;
 311                 size = strlen(bufp);
 312                 break;
 313               default:
 314                 buf[0] = '&';
 315                 size = 1;
 316                 if (c != '&')
 317                     buf[size++] = c;
 318             }
 319         } else {
 320             buf[0] = *s++;
 321             size = 1;
 322         }
 323         if (size > len)
 324             size = len;
 325         memcpy(d, bufp, size);
 326         d += size;
 327         len -= size;
 328     }
 329     *d = '\0';
 330
 331     *dest = filename_from_str(buffer);
 332 }