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logging.c
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logging.c
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#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <time.h>
#include <assert.h>
#include "putty.h"
/* log session to file stuff ... */
static FILE *lgfp = NULL;
static char currlogfilename[FILENAME_MAX];
static void xlatlognam(char *d, char *s, char *hostname, struct tm *tm);
/*
* Log session traffic.
*/
void logtraffic(unsigned char c, int logmode)
{
if (cfg.logtype > 0) {
if (cfg.logtype == logmode) {
/* deferred open file from pgm start? */
if (!lgfp)
logfopen();
if (lgfp)
fputc(c, lgfp);
}
}
}
/*
* Log an Event Log entry (used in SSH packet logging mode).
*/
void log_eventlog(char *event)
{
if (cfg.logtype != LGTYP_PACKETS)
return;
if (!lgfp)
logfopen();
if (lgfp)
fprintf(lgfp, "Event Log: %s\n", event);
}
/*
* Log an SSH packet.
*/
void log_packet(int direction, int type, char *texttype, void *data, int len)
{
int i, j;
char dumpdata[80], smalldata[5];
if (cfg.logtype != LGTYP_PACKETS)
return;
if (!lgfp)
logfopen();
if (lgfp) {
fprintf(lgfp, "%s packet type %d / 0x%02x (%s)\n",
direction == PKT_INCOMING ? "Incoming" : "Outgoing",
type, type, texttype);
for (i = 0; i < len; i += 16) {
sprintf(dumpdata, " %08x%*s\n", i, 1+3*16+2+16, "");
for (j = 0; j < 16 && i+j < len; j++) {
int c = ((unsigned char *)data)[i+j];
sprintf(smalldata, "%02x", c);
dumpdata[10+2+3*j] = smalldata[0];
dumpdata[10+2+3*j+1] = smalldata[1];
dumpdata[10+1+3*16+2+j] = (isprint(c) ? c : '.');
}
strcpy(dumpdata + 10+1+3*16+2+j, "\n");
fputs(dumpdata, lgfp);
}
fflush(lgfp);
}
}
/* open log file append/overwrite mode */
void logfopen(void)
{
char buf[256];
time_t t;
struct tm tm;
char writemod[4];
/* Prevent repeat calls */
if (lgfp)
return;
if (!cfg.logtype)
return;
sprintf(writemod, "wb"); /* default to rewrite */
time(&t);
tm = *localtime(&t);
/* substitute special codes in file name */
xlatlognam(currlogfilename,cfg.logfilename,cfg.host, &tm);
lgfp = fopen(currlogfilename, "r"); /* file already present? */
if (lgfp) {
int i;
fclose(lgfp);
i = askappend(currlogfilename);
if (i == 1)
writemod[0] = 'a'; /* set append mode */
else if (i == 0) { /* cancelled */
lgfp = NULL;
cfg.logtype = 0; /* disable logging */
return;
}
}
lgfp = fopen(currlogfilename, writemod);
if (lgfp) { /* enter into event log */
/* --- write header line into log file */
fputs("=~=~=~=~=~=~=~=~=~=~=~= PuTTY log ", lgfp);
strftime(buf, 24, "%Y.%m.%d %H:%M:%S", &tm);
fputs(buf, lgfp);
fputs(" =~=~=~=~=~=~=~=~=~=~=~=\r\n", lgfp);
sprintf(buf, "%s session log (%s mode) to file: ",
(writemod[0] == 'a') ? "Appending" : "Writing new",
(cfg.logtype == LGTYP_ASCII ? "ASCII" :
cfg.logtype == LGTYP_DEBUG ? "raw" :
cfg.logtype == LGTYP_PACKETS ? "SSH packets" : "<ukwn>"));
/* Make sure we do not exceed the output buffer size */
strncat(buf, currlogfilename, 128);
buf[strlen(buf)] = '\0';
logevent(buf);
}
}
void logfclose(void)
{
if (lgfp) {
fclose(lgfp);
lgfp = NULL;
}
}
/*
* translate format codes into time/date strings
* and insert them into log file name
*
* "&Y":YYYY "&m":MM "&d":DD "&T":hhmm "&h":<hostname> "&&":&
*/
static void xlatlognam(char *d, char *s, char *hostname, struct tm *tm) {
char buf[10], *bufp;
int size;
int len = FILENAME_MAX-1;
while (*s) {
/* Let (bufp, len) be the string to append. */
bufp = buf; /* don't usually override this */
if (*s == '&') {
char c;
s++;
size = 0;
if (*s) switch (c = *s++, tolower(c)) {
case 'y':
size = strftime(buf, sizeof(buf), "%Y", tm);
break;
case 'm':
size = strftime(buf, sizeof(buf), "%m", tm);
break;
case 'd':
size = strftime(buf, sizeof(buf), "%d", tm);
break;
case 't':
size = strftime(buf, sizeof(buf), "%H%M%S", tm);
break;
case 'h':
bufp = hostname;
size = strlen(bufp);
break;
default:
buf[0] = '&';
size = 1;
if (c != '&')
buf[size++] = c;
}
} else {
buf[0] = *s++;
size = 1;
}
if (size > len)
size = len;
memcpy(d, bufp, size);
d += size;
len -= size;
}
*d = '\0';
}