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         fflush(lgfp);
  64     }
  65 }
  66
  67 /* open log file append/overwrite mode */
  68 void logfopen(void)
  69 {
  70     char buf[256];
  71     time_t t;
  72     struct tm tm;
  73     char writemod[4];
  74
  75     if (!cfg.logtype)
  76         return;
  77     sprintf(writemod, "wb");           /* default to rewrite */
  78
  79     time(&t);
  80     tm = *localtime(&t);
  81
  82     /* substitute special codes in file name */
  83     xlatlognam(currlogfilename,cfg.logfilename,cfg.host, &tm);
  84
  85     lgfp = fopen(currlogfilename, "r"); /* file already present? */
  86     if (lgfp) {
  87         int i;
  88         fclose(lgfp);
  89         i = askappend(currlogfilename);
  90         if (i == 1)
  91             writemod[0] = 'a';         /* set append mode */
  92         else if (i == 0) {             /* cancelled */
  93             lgfp = NULL;
  94             cfg.logtype = 0;           /* disable logging */
  95             return;
  96         }
  97     }
  98
  99     lgfp = fopen(currlogfilename, writemod);
 100     if (lgfp) {                        /* enter into event log */
 101         sprintf(buf, "%s session log (%s mode) to file : ",
 102                 (writemod[0] == 'a') ? "Appending" : "Writing new",
 103                 (cfg.logtype == LGTYP_ASCII ? "ASCII" :
 104                  cfg.logtype == LGTYP_DEBUG ? "raw" : "<ukwn>"));
 105         /* Make sure we do not exceed the output buffer size */
 106         strncat(buf, currlogfilename, 128);
 107         buf[strlen(buf)] = '\0';
 108         logevent(buf);
 109
 110         /* --- write header line into log file */
 111         fputs("=~=~=~=~=~=~=~=~=~=~=~= PuTTY log ", lgfp);
 112         strftime(buf, 24, "%Y.%m.%d %H:%M:%S", &tm);
 113         fputs(buf, lgfp);
 114         fputs(" =~=~=~=~=~=~=~=~=~=~=~=\r\n", lgfp);
 115     }
 116 }
 117
 118 void logfclose(void)
 119 {
 120     if (lgfp) {
 121         fclose(lgfp);
 122         lgfp = NULL;
 123     }
 124 }
 125
 126 /*
 127  * translate format codes into time/date strings
 128  * and insert them into log file name
 129  *
 130  * "&Y":YYYY   "&m":MM   "&d":DD   "&T":hhmm   "&h":<hostname>   "&&":&
 131  */
 132 static void xlatlognam(char *d, char *s, char *hostname, struct tm *tm) {
 133     char buf[10], *bufp;
 134     int size;
 135     char *ds = d; /* save start pos. */
 136     int len = FILENAME_MAX-1;
 137
 138     while (*s) {
 139         /* Let (bufp, len) be the string to append. */
 140         bufp = buf;                    /* don't usually override this */
 141         if (*s == '&') {
 142             char c;
 143             s++;
 144             if (*s) switch (c = *s++, tolower(c)) {
 145               case 'y':
 146                 size = strftime(buf, sizeof(buf), "%Y", tm);
 147                 break;
 148               case 'm':
 149                 size = strftime(buf, sizeof(buf), "%m", tm);
 150                 break;
 151               case 'd':
 152                 size = strftime(buf, sizeof(buf), "%d", tm);
 153                 break;
 154               case 't':
 155                 size = strftime(buf, sizeof(buf), "%H%M%S", tm);
 156                 break;
 157               case 'h':
 158                 bufp = hostname;
 159                 size = strlen(bufp);
 160                 break;
 161               default:
 162                 buf[0] = '&';
 163                 size = 1;
 164                 if (c != '&')
 165                     buf[size++] = c;
 166             }
 167         } else {
 168             buf[0] = *s++;
 169             size = 1;
 170         }
 171         if (size > len)
 172             size = len;
 173         memcpy(d, bufp, size);
 174         d += size;
 175         len -= size;
 176     }
 177     *d = '\0';
 178 }