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     char currlogfilename[FILENAME_MAX];
  14     void *frontend;
  15 };
  16
  17 static void xlatlognam(char *d, char *s, char *hostname, struct tm *tm);
  18
  19 /*
  20  * Log session traffic.
  21  */
  22 void logtraffic(void *handle, unsigned char c, int logmode)
  23 {
  24     struct LogContext *ctx = (struct LogContext *)handle;
  25     if (cfg.logtype > 0) {
  26         if (cfg.logtype == logmode) {
  27             /* deferred open file from pgm start? */
  28             if (!ctx->lgfp)
  29                 logfopen(ctx);
  30             if (ctx->lgfp)
  31                 fputc(c, ctx->lgfp);
  32         }
  33     }
  34 }
  35
  36 /*
  37  * Log an Event Log entry (used in SSH packet logging mode).
  38  */
  39 void log_eventlog(void *handle, char *event)
  40 {
  41     struct LogContext *ctx = (struct LogContext *)handle;
  42     if (cfg.logtype != LGTYP_PACKETS)
  43         return;
  44     if (!ctx->lgfp)
  45         logfopen(ctx);
  46     if (ctx->lgfp)
  47         fprintf(ctx->lgfp, "Event Log: %s\n", event);
  48 }
  49
  50 /*
  51  * Log an SSH packet.
  52  */
  53 void log_packet(void *handle, int direction, int type,
  54                 char *texttype, void *data, int len)
  55 {
  56     struct LogContext *ctx = (struct LogContext *)handle;
  57     int i, j;
  58     char dumpdata[80], smalldata[5];
  59
  60     if (cfg.logtype != LGTYP_PACKETS)
  61         return;
  62     if (!ctx->lgfp)
  63         logfopen(ctx);
  64     if (ctx->lgfp) {
  65         fprintf(ctx->lgfp, "%s packet type %d / 0x%02x (%s)\n",
  66                 direction == PKT_INCOMING ? "Incoming" : "Outgoing",
  67                 type, type, texttype);
  68         for (i = 0; i < len; i += 16) {
  69             sprintf(dumpdata, "  %08x%*s\n", i, 1+3*16+2+16, "");
  70             for (j = 0; j < 16 && i+j < len; j++) {
  71                 int c = ((unsigned char *)data)[i+j];
  72                 sprintf(smalldata, "%02x", c);
  73                 dumpdata[10+2+3*j] = smalldata[0];
  74                 dumpdata[10+2+3*j+1] = smalldata[1];
  75                 dumpdata[10+1+3*16+2+j] = (isprint(c) ? c : '.');
  76             }
  77             strcpy(dumpdata + 10+1+3*16+2+j, "\n");
  78             fputs(dumpdata, ctx->lgfp);
  79         }
  80         fflush(ctx->lgfp);
  81     }
  82 }
  83
  84 /* open log file append/overwrite mode */
  85 void logfopen(void *handle)
  86 {
  87     struct LogContext *ctx = (struct LogContext *)handle;
  88     char buf[256];
  89     time_t t;
  90     struct tm tm;
  91     char writemod[4];
  92
  93     /* Prevent repeat calls */
  94     if (ctx->lgfp)
  95         return;
  96
  97     if (!cfg.logtype)
  98         return;
  99     sprintf(writemod, "w");            /* default to rewrite */
 100
 101     time(&t);
 102     tm = *localtime(&t);
 103
 104     /* substitute special codes in file name */
 105     xlatlognam(ctx->currlogfilename, cfg.logfilename,cfg.host, &tm);
 106
 107     ctx->lgfp = fopen(ctx->currlogfilename, "r");  /* file already present? */
 108     if (ctx->lgfp) {
 109         int i;
 110         fclose(ctx->lgfp);
 111         i = askappend(ctx->frontend, ctx->currlogfilename);
 112         if (i == 1)
 113             writemod[0] = 'a';         /* set append mode */
 114         else if (i == 0) {             /* cancelled */
 115             ctx->lgfp = NULL;
 116             cfg.logtype = 0;           /* disable logging */
 117             return;
 118         }
 119     }
 120
 121     ctx->lgfp = fopen(ctx->currlogfilename, writemod);
 122     if (ctx->lgfp) {                           /* enter into event log */
 123         /* --- write header line into log file */
 124         fputs("=~=~=~=~=~=~=~=~=~=~=~= PuTTY log ", ctx->lgfp);
 125         strftime(buf, 24, "%Y.%m.%d %H:%M:%S", &tm);
 126         fputs(buf, ctx->lgfp);
 127         fputs(" =~=~=~=~=~=~=~=~=~=~=~=\n", ctx->lgfp);
 128
 129         sprintf(buf, "%s session log (%s mode) to file: ",
 130                 (writemod[0] == 'a') ? "Appending" : "Writing new",
 131                 (cfg.logtype == LGTYP_ASCII ? "ASCII" :
 132                  cfg.logtype == LGTYP_DEBUG ? "raw" :
 133                  cfg.logtype == LGTYP_PACKETS ? "SSH packets" : "<ukwn>"));
 134         /* Make sure we do not exceed the output buffer size */
 135         strncat(buf, ctx->currlogfilename, 128);
 136         buf[strlen(buf)] = '\0';
 137         logevent(ctx->frontend, buf);
 138     }
 139 }
 140
 141 void logfclose(void *handle)
 142 {
 143     struct LogContext *ctx = (struct LogContext *)handle;
 144     if (ctx->lgfp) {
 145         fclose(ctx->lgfp);
 146         ctx->lgfp = NULL;
 147     }
 148 }
 149
 150 void *log_init(void *frontend)
 151 {
 152     struct LogContext *ctx = smalloc(sizeof(struct LogContext));
 153     ctx->lgfp = NULL;
 154     ctx->frontend = frontend;
 155     return ctx;
 156 }
 157
 158 /*
 159  * translate format codes into time/date strings
 160  * and insert them into log file name
 161  *
 162  * "&Y":YYYY   "&m":MM   "&d":DD   "&T":hhmm   "&h":<hostname>   "&&":&
 163  */
 164 static void xlatlognam(char *d, char *s, char *hostname, struct tm *tm) {
 165     char buf[10], *bufp;
 166     int size;
 167     int len = FILENAME_MAX-1;
 168
 169     while (*s) {
 170         /* Let (bufp, len) be the string to append. */
 171         bufp = buf;                    /* don't usually override this */
 172         if (*s == '&') {
 173             char c;
 174             s++;
 175             size = 0;
 176             if (*s) switch (c = *s++, tolower(c)) {
 177               case 'y':
 178                 size = strftime(buf, sizeof(buf), "%Y", tm);
 179                 break;
 180               case 'm':
 181                 size = strftime(buf, sizeof(buf), "%m", tm);
 182                 break;
 183               case 'd':
 184                 size = strftime(buf, sizeof(buf), "%d", tm);
 185                 break;
 186               case 't':
 187                 size = strftime(buf, sizeof(buf), "%H%M%S", tm);
 188                 break;
 189               case 'h':
 190                 bufp = hostname;
 191                 size = strlen(bufp);
 192                 break;
 193               default:
 194                 buf[0] = '&';
 195                 size = 1;
 196                 if (c != '&')
 197                     buf[size++] = c;
 198             }
 199         } else {
 200             buf[0] = *s++;
 201             size = 1;
 202         }
 203         if (size > len)
 204             size = len;
 205         memcpy(d, bufp, size);
 206         d += size;
 207         len -= size;
 208     }
 209     *d = '\0';
 210 }