sbserver8:/home/chester/openssh-4.2p1 # more script.c
#include "includes.h"
#include "log.h"
#include "script.h"

/*
 * Log tty output in script format with additional timing information.
 * Log file timing format:
 * ss.hh cc
 * Where:
 *   ss: seconds since Jan 1, 1970.
 *   hh: hundredths of seconds
 *   cc: character count
 * Inspired by http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=68556
 */

#define SCRIPTDIR "/var/log/openssh"
#define LOG_IMMEDIATE

static FILE    *scriptfd = NULL;
static FILE    *timingfd = NULL;

static long int oldseconds = 0, oldhundredthsofseconds = 0, charcount = 0;

void
script_open(char *username)
{
        time_t          tvec;
        char            fname[FILENAME_MAX + 1];
        char            logname[FILENAME_MAX + 1];
        u_int32_t       rnd;
        struct stat     st;
        int             oldmask;

        if (username == NULL) {
                username = "Error";
        }
        /*
         * Create log directory if necessary
         */
        if (stat(SCRIPTDIR, &st) < 0) {
                if (mkdir(SCRIPTDIR, 0700) < 0)
                        error("Could not create directory '%s'.", SCRIPTDIR);
        }
        /*
         * Create unique filename
         */
        if ((tvec = time(NULL)) == -1) {
                fatal("%s", strerror(errno));
        }
        strftime(logname, sizeof(logname), "%F.%T", gmtime(&tvec));
        rnd = arc4random();
        oldmask = umask(077);
        snprintf(fname, sizeof(fname), "%s/openssh.%s.%s.%08x.typescript", SCRIPTDIR, logname,
                 username, rnd);
        if ((scriptfd = fopen(fname, "a")) == NULL) {
                error("Could not create script file '%s': %s", fname, strerror(errno));
                umask(oldmask);
                return;
        }
        fprintf(scriptfd, "Script started on %s\n", ctime(&tvec));
        snprintf(fname, sizeof(fname), "%s/openssh.%s.%s.%08x.timing", SCRIPTDIR, logname,
                 username, rnd);
        if ((timingfd = fopen(fname, "a")) == NULL) {
                error("Could not create timing file '%s': %s", fname, strerror(errno));
                umask(oldmask);
                return;
        }
        umask(oldmask);
#ifdef LOG_IMMEDIATE
        /*
         * Even if sshd crashes or is killed, we still have logs
         */
        setvbuf(scriptfd, NULL, _IONBF, 0);
        setvbuf(timingfd, NULL, _IONBF, 0);
#endif
}

void
script_close()
{
        time_t          tvec;

        if (scriptfd != NULL) {
                if ((tvec = time(NULL)) != -1) {
                        fprintf(scriptfd, "Script ended on %s\n", ctime(&tvec));
                }
                fclose(scriptfd);
                scriptfd = NULL;
        }
        if (timingfd != NULL) {
                if (charcount != 0) {
                        fprintf(timingfd, "%li.%02li %li\n", oldseconds,
                                oldhundredthsofseconds, charcount);
                }
                fclose(timingfd);
                timingfd = NULL;
        }
}

/*
 * Log string 'buf' of length 'len'
 */

void
script(char *buf, int len)
{
        struct timeval  tv;
        long int        seconds;
        long int        hundredthsofseconds;

        if ((buf != NULL) && (len > 0)) {
                /*
                 * .timing file: timestamp and character count
                 */
                if (timingfd != NULL) {
                        if ((gettimeofday(&tv, NULL)) == -1) {
                                fatal("%s", strerror(errno));
                        }
                        seconds = tv.tv_sec;
                        hundredthsofseconds = tv.tv_usec / 10000;
                        if ((seconds == oldseconds)
                        && (hundredthsofseconds == oldhundredthsofseconds)) {
                                charcount += len;
                        } else {
                                if (charcount != 0) {
                                        fprintf(timingfd, "%li.%02li %li\n", oldseconds,
                                         oldhundredthsofseconds, charcount);
                                }
                                oldseconds = seconds;
                                oldhundredthsofseconds = hundredthsofseconds;
                                charcount = len;
                        }
                }
                /*
                 * .typescript file: string
                 */
                if (scriptfd != NULL) {
                        fwrite(buf, 1, len, scriptfd);
                }
        }
}

/* not truncated */
sbserver8:/home/chester/openssh-4.2p1 #