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

   1 #include <windows.h>
   2
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <ctype.h>
   6
   7 #include <time.h>
   8 #include <assert.h>
   9
  10 #include "putty.h"
  11
  12 /* log session to file stuff ... */
  13 static FILE *lgfp = NULL;
  14 static char timdatbuf[20];
  15 static char currlogfilename[FILENAME_MAX];
  16
  17 static void xlatlognam(char *d, char *s, char *hostname, struct tm *tm);
  18
  19 /*
  20  * Log session traffic.
  21  */
  22 void logtraffic(unsigned char c, int logmode)
  23 {
  24     if (cfg.logtype > 0) {
  25         if (cfg.logtype == logmode) {
  26             /* deferred open file from pgm start? */
  27             if (!lgfp)
  28                 logfopen();
  29             if (lgfp)
  30                 fputc(c, lgfp);
  31         }
  32     }
  33 }
  34
  35 /*
  36  * Log an SSH packet.
  37  */
  38 void log_packet(int direction, int type, char *texttype, void *data, int len)
  39 {
  40     int i, j, c;
  41     char dumpdata[80], smalldata[5];
  42
  43     if (cfg.logtype != LGTYP_PACKETS)
  44         return;
  45     if (!lgfp)
  46         logfopen();
  47     if (lgfp) {
  48         fprintf(lgfp, "%s packet type %d / 0x%02x (%s)\n",
  49                 direction == PKT_INCOMING ? "Incoming" : "Outgoing",
  50                 type, type, texttype);
  51         for (i = 0; i < len; i += 16) {
  52             sprintf(dumpdata, "  %08x%*s\n", i, 1+3*16+2+16, "");
  53             for (j = 0; j < 16 && i+j < len; j++) {
  54                 int c = ((unsigned char *)data)[i+j];
  55                 sprintf(smalldata, "%02x", c);
  56                 dumpdata[10+2+3*j] = smalldata[0];
  57                 dumpdata[10+2+3*j+1] = smalldata[1];
  58                 dumpdata[10+1+3*16+2+j] = (isprint(c) ? c : '.');
  59             }
  60             strcpy(dumpdata + 10+1+3*16+2+j, "\n");
  61             fputs(dumpdata, lgfp);
  62         }
  63     }
  64 }
  65
  66 /* open log file append/overwrite mode */
  67 void logfopen(void)
  68 {
  69     char buf[256];
  70     time_t t;
  71     struct tm tm;
  72     char writemod[4];
  73
  74     if (!cfg.logtype)
  75         return;
  76     sprintf(writemod, "wb");           /* default to rewrite */
  77
  78     time(&t);
  79     tm = *localtime(&t);
  80
  81     /* substitute special codes in file name */
  82     xlatlognam(currlogfilename,cfg.logfilename,cfg.host, &tm);
  83
  84     lgfp = fopen(currlogfilename, "r"); /* file already present? */
  85     if (lgfp) {
  86         int i;
  87         fclose(lgfp);
  88         i = askappend(currlogfilename);
  89         if (i == 1)
  90             writemod[0] = 'a';         /* set append mode */
  91         else if (i == 0) {             /* cancelled */
  92             lgfp = NULL;
  93             cfg.logtype = 0;           /* disable logging */
  94             return;
  95         }
  96     }
  97
  98     lgfp = fopen(currlogfilename, writemod);
  99     if (lgfp) {                        /* enter into event log */
 100         sprintf(buf, "%s session log (%s mode) to file : ",
 101                 (writemod[0] == 'a') ? "Appending" : "Writing new",
 102                 (cfg.logtype == LGTYP_ASCII ? "ASCII" :
 103                  cfg.logtype == LGTYP_DEBUG ? "raw" : "<ukwn>"));
 104         /* Make sure we do not exceed the output buffer size */
 105         strncat(buf, currlogfilename, 128);
 106         buf[strlen(buf)] = '\0';
 107         logevent(buf);
 108
 109         /* --- write header line into log file */
 110         fputs("=~=~=~=~=~=~=~=~=~=~=~= PuTTY log ", lgfp);
 111         strftime(buf, 24, "%Y.%m.%d %H:%M:%S", &tm);
 112         fputs(buf, lgfp);
 113         fputs(" =~=~=~=~=~=~=~=~=~=~=~=\r\n", lgfp);
 114     }
 115 }
 116
 117 void logfclose(void)
 118 {
 119     if (lgfp) {
 120         fclose(lgfp);
 121         lgfp = NULL;
 122     }
 123 }
 124
 125 /*
 126  * translate format codes into time/date strings
 127  * and insert them into log file name
 128  *
 129  * "&Y":YYYY   "&m":MM   "&d":DD   "&T":hhmm   "&h":<hostname>   "&&":&
 130  */
 131 static void xlatlognam(char *d, char *s, char *hostname, struct tm *tm) {
 132     char buf[10], *bufp;
 133     int size;
 134     char *ds = d; /* save start pos. */
 135     int len = FILENAME_MAX-1;
 136
 137     while (*s) {
 138         /* Let (bufp, len) be the string to append. */
 139         bufp = buf;                    /* don't usually override this */
 140         if (*s == '&') {
 141             char c;
 142             s++;
 143             if (*s) switch (c = *s++, tolower(c)) {
 144               case 'y':
 145                 size = strftime(buf, sizeof(buf), "%Y", tm);
 146                 break;
 147               case 'm':
 148                 size = strftime(buf, sizeof(buf), "%m", tm);
 149                 break;
 150               case 'd':
 151                 size = strftime(buf, sizeof(buf), "%d", tm);
 152                 break;
 153               case 't':
 154                 size = strftime(buf, sizeof(buf), "%H%M%S", tm);
 155                 break;
 156               case 'h':
 157                 bufp = hostname;
 158                 size = strlen(bufp);
 159                 break;
 160               default:
 161                 buf[0] = '&';
 162                 size = 1;
 163                 if (c != '&')
 164                     buf[size++] = c;
 165             }
 166         } else {
 167             buf[0] = *s++;
 168             size = 1;
 169         }
 170         if (size > len)
 171             size = len;
 172         memcpy(d, bufp, size);
 173         d += size;
 174         len -= size;
 175     }
 176     *d = '\0';
 177 }