~ubuntu-branches/ubuntu/oneiric/sudo/oneiric-updates

/*
 * Copyright (c) 2009-2010 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <config.h>

#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif /* HAVE_SYS_SELECT_H */
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
#  include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
#  include <memory.h>
# endif
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#if TIME_WITH_SYS_TIME
# include <time.h>
#endif
#ifndef HAVE_TIMESPEC
# include <emul/timespec.h>
#endif
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <fcntl.h>
#ifdef HAVE_DIRENT_H
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# ifdef HAVE_SYS_NDIR_H
#  include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
#  include <sys/dir.h>
# endif
# ifdef HAVE_NDIR_H
#  include <ndir.h>
# endif
#endif
#ifdef HAVE_REGCOMP
# include <regex.h>
#endif
#ifdef HAVE_ZLIB_H
# include <zlib.h>
#endif
#ifdef HAVE_SETLOCALE
# include <locale.h>
#endif
#include <signal.h>

#include <pathnames.h>

#include "compat.h"
#include "alloc.h"
#include "error.h"
#include "missing.h"

#ifndef LINE_MAX
# define LINE_MAX 2048
#endif

/* Must match the defines in iolog.c */
#define IOFD_STDIN      0
#define IOFD_STDOUT     1
#define IOFD_STDERR     2
#define IOFD_TTYIN      3
#define IOFD_TTYOUT     4
#define IOFD_TIMING     5
#define IOFD_MAX        6

/* Bitmap of iofds to be replayed */
unsigned int replay_filter = (1 << IOFD_STDOUT) | (1 << IOFD_STDERR) |
			     (1 << IOFD_TTYOUT);

/* For getopt(3) */
extern char *optarg;
extern int optind;

int Argc;
char **Argv;

union io_fd {
    FILE *f;
#ifdef HAVE_ZLIB_H
    gzFile g;
#endif
    void *v;
};

/*
 * Info present in the I/O log file
 */
struct log_info {
    char *cwd;
    char *user;
    char *runas_user;
    char *runas_group;
    char *tty;
    char *cmd;
    time_t tstamp;
};

/*
 * Handle expressions like:
 * ( user millert or user root ) and tty console and command /bin/sh
 */
struct search_node {
    struct search_node *next;
#define ST_EXPR		1
#define ST_TTY		2
#define ST_USER		3
#define ST_PATTERN	4
#define ST_RUNASUSER	5
#define ST_RUNASGROUP	6
#define ST_FROMDATE	7
#define ST_TODATE	8
#define ST_CWD		9
    char type;
    char negated;
    char or;
    char pad;
    union {
#ifdef HAVE_REGCOMP
	regex_t cmdre;
#endif
	time_t tstamp;
	char *cwd;
	char *tty;
	char *user;
	char *pattern;
	char *runas_group;
	char *runas_user;
	struct search_node *expr;
	void *ptr;
    } u;
} *search_expr;

#define STACK_NODE_SIZE	32
static struct search_node *node_stack[32];
static int stack_top;

static const char *session_dir = _PATH_SUDO_IO_LOGDIR;

static union io_fd io_fds[IOFD_MAX];
static const char *io_fnames[IOFD_MAX] = {
    "/stdin",
    "/stdout",
    "/stderr",
    "/ttyin",
    "/ttyout",
    "/timing"
};

extern time_t get_date __P((char *));
extern char *get_timestr __P((time_t, int));
extern int term_raw __P((int, int));
extern int term_restore __P((int, int));
extern void zero_bytes __P((volatile void *, size_t));
void cleanup __P((int));

static int list_sessions __P((int, char **, const char *, const char *, const char *));
static int parse_expr __P((struct search_node **, char **));
static void check_input __P((int, double *));
static void delay __P((double));
static void usage __P((void));
static void *open_io_fd __P((char *pathbuf, int len, const char *suffix));
static int parse_timing __P((const char *buf, const char *decimal, int *idx, double *seconds, size_t *nbytes));

#ifdef HAVE_REGCOMP
# define REGEX_T	regex_t
#else
# define REGEX_T	char
#endif

#define VALID_ID(s) (isalnum((unsigned char)(s)[0]) && \
    isalnum((unsigned char)(s)[1]) && isalnum((unsigned char)(s)[2]) && \
    isalnum((unsigned char)(s)[3]) && isalnum((unsigned char)(s)[4]) && \
    isalnum((unsigned char)(s)[5]) && (s)[6] == '\0')

int
main(argc, argv)
    int argc;
    char *argv[];
{
    int ch, idx, plen, nready, interactive = 0, listonly = 0;
    const char *id, *user = NULL, *pattern = NULL, *tty = NULL, *decimal = ".";
    char path[PATH_MAX], buf[LINE_MAX], *cp, *ep;
    double seconds, to_wait, speed = 1.0, max_wait = 0;
    FILE *lfile;
    fd_set *fdsw;
    sigaction_t sa;
    size_t len, nbytes, nread, off;
    ssize_t nwritten;

    Argc = argc;
    Argv = argv;

#ifdef HAVE_SETLOCALE
    setlocale(LC_ALL, "");
    decimal = localeconv()->decimal_point;
#endif

    while ((ch = getopt(argc, argv, "d:f:lm:s:V")) != -1) {
	switch(ch) {
	case 'd':
	    session_dir = optarg;
	    break;
	case 'f':
	    /* Set the replay filter. */
	    replay_filter = 0;
	    for (cp = strtok(optarg, ","); cp; cp = strtok(NULL, ",")) {
		if (strcmp(cp, "stdout") == 0)
		    SET(replay_filter, 1 << IOFD_STDOUT);
		else if (strcmp(cp, "stderr") == 0)
		    SET(replay_filter, 1 << IOFD_STDERR);
		else if (strcmp(cp, "ttyout") == 0)
		    SET(replay_filter, 1 << IOFD_TTYOUT);
		else
		    errorx(1, "invalid filter option: %s", optarg);
	    }
	    break;
	case 'l':
	    listonly = 1;
	    break;
	case 'm':
	    errno = 0;
	    max_wait = strtod(optarg, &ep);
	    if (*ep != '\0' || errno != 0)
		errorx(1, "invalid max wait: %s", optarg);
	    break;
	case 's':
	    errno = 0;
	    speed = strtod(optarg, &ep);
	    if (*ep != '\0' || errno != 0)
		errorx(1, "invalid speed factor: %s", optarg);
	    break;
	case 'V':
	    (void) printf("%s version %s\n", getprogname(), PACKAGE_VERSION);
	    exit(0);
	default:
	    usage();
	    /* NOTREACHED */
	}

    }
    argc -= optind;
    argv += optind;

    if (listonly)
	exit(list_sessions(argc, argv, pattern, user, tty));

    if (argc != 1)
	usage();

    /* 6 digit ID in base 36, e.g. 01G712AB */
    id = argv[0];
    if (!VALID_ID(id))
	errorx(1, "invalid ID %s", id);

    plen = snprintf(path, sizeof(path), "%s/%.2s/%.2s/%.2s/timing",
	session_dir, id, &id[2], &id[4]);
    if (plen <= 0 || plen >= sizeof(path))
	errorx(1, "%s/%.2s/%.2s/%.2s/%.2s/timing: %s", session_dir,
	    id, &id[2], &id[4], strerror(ENAMETOOLONG));
    plen -= 7;

    /* Open files for replay, applying replay filter for the -f flag. */
    for (idx = 0; idx < IOFD_MAX; idx++) {
	if (ISSET(replay_filter, 1 << idx) || idx == IOFD_TIMING) {
	    io_fds[idx].v = open_io_fd(path, plen, io_fnames[idx]);
	    if (io_fds[idx].v == NULL)
		error(1, "unable to open %s", path);
	}
    }

    /* Read log file. */
    path[plen] = '\0';
    strlcat(path, "/log", sizeof(path));
    lfile = fopen(path, "r");
    if (lfile == NULL)
	error(1, "unable to open %s", path);
    cp = NULL;
    len = 0;
    getline(&cp, &len, lfile); /* log */
    getline(&cp, &len, lfile); /* cwd */
    getline(&cp, &len, lfile); /* command */
    printf("Replaying sudo session: %s", cp);
    free(cp);
    fclose(lfile);

    fflush(stdout);
    zero_bytes(&sa, sizeof(sa));
    sigemptyset(&sa.sa_mask);
    sa.sa_flags = SA_RESETHAND;
    sa.sa_handler = cleanup;
    (void) sigaction(SIGINT, &sa, NULL);
    (void) sigaction(SIGKILL, &sa, NULL);
    (void) sigaction(SIGTERM, &sa, NULL);
    (void) sigaction(SIGHUP, &sa, NULL);
    sa.sa_flags = SA_RESTART;
    sa.sa_handler = SIG_IGN;
    (void) sigaction(SIGTSTP, &sa, NULL);
    (void) sigaction(SIGQUIT, &sa, NULL);

    /* XXX - read user input from /dev/tty and set STDOUT to raw if not a pipe */
    /* Set stdin to raw mode if it is a tty */
    interactive = isatty(STDIN_FILENO);
    if (interactive) {
	ch = fcntl(STDIN_FILENO, F_GETFL, 0);
	if (ch != -1)
	    (void) fcntl(STDIN_FILENO, F_SETFL, ch | O_NONBLOCK);
	if (!term_raw(STDIN_FILENO, 1))
	    error(1, "cannot set tty to raw mode");
    }
    fdsw = (fd_set *)emalloc2(howmany(STDOUT_FILENO + 1, NFDBITS),
	sizeof(fd_mask));

    /*
     * Timing file consists of line of the format: "%f %d\n"
     */
#ifdef HAVE_ZLIB_H
    while (gzgets(io_fds[IOFD_TIMING].g, buf, sizeof(buf)) != NULL) {
#else
    while (fgets(buf, sizeof(buf), io_fds[IOFD_TIMING].f) != NULL) {
#endif
	if (!parse_timing(buf, decimal, &idx, &seconds, &nbytes))
	    errorx(1, "invalid timing file line: %s", buf);

	if (interactive)
	    check_input(STDIN_FILENO, &speed);

	/* Adjust delay using speed factor and clamp to max_wait */
	to_wait = seconds / speed;
	if (max_wait && to_wait > max_wait)
	    to_wait = max_wait;
	delay(to_wait);

	/* Even if we are not relaying, we still have to delay. */
	if (io_fds[idx].v == NULL)
	    continue;

	/* All output is sent to stdout. */
	while (nbytes != 0) {
	    if (nbytes > sizeof(buf))
		len = sizeof(buf);
	    else
		len = nbytes;
#ifdef HAVE_ZLIB_H
	    nread = gzread(io_fds[idx].g, buf, len);
#else
	    nread = fread(buf, 1, len, io_fds[idx].f);
#endif
	    nbytes -= nread;
	    off = 0;
	    do {
		/* no stdio, must be unbuffered */
		nwritten = write(STDOUT_FILENO, buf + off, nread - off);
		if (nwritten == -1) {
		    if (errno == EINTR)
			continue;
		    if (errno == EAGAIN) {
			FD_SET(STDOUT_FILENO, fdsw);
			do {
			    nready = select(STDOUT_FILENO + 1, NULL, fdsw, NULL, NULL);
			} while (nready == -1 && errno == EINTR);
			if (nready == 1)
			    continue;
		    }
		    error(1, "writing to standard output");
		}
		off += nwritten;
	    } while (nread > off);
	}
    }
    term_restore(STDIN_FILENO, 1);
    exit(0);
}

static void
delay(secs)
    double secs;
{
    struct timespec ts, rts;
    int rval;

    /*
     * Typical max resolution is 1/HZ but we can't portably check that.
     * If the interval is small enough, just ignore it.
     */
    if (secs < 0.0001)
	return;

    rts.tv_sec = secs;
    rts.tv_nsec = (secs - (double) rts.tv_sec) * 1000000000.0;
    do {
      memcpy(&ts, &rts, sizeof(ts));
      rval = nanosleep(&ts, &rts);
    } while (rval == -1 && errno == EINTR);
    if (rval == -1)
	error(1, "nanosleep: tv_sec %ld, tv_nsec %ld", ts.tv_sec, ts.tv_nsec);
}

static void *
open_io_fd(path, len, suffix)
    char *path;
    int len;
    const char *suffix;
{
    path[len] = '\0';
    strlcat(path, suffix, PATH_MAX);

#ifdef HAVE_ZLIB_H
    return gzopen(path, "r");
#else
    return fopen(path, "r");
#endif
}

/*
 * Build expression list from search args
 */
static int
parse_expr(headp, argv)
    struct search_node **headp;
    char *argv[];
{
    struct search_node *sn, *newsn;
    char or = 0, not = 0, type, **av;

    sn = *headp;
    for (av = argv; *av; av++) {
	switch (av[0][0]) {
	case 'a': /* and (ignore) */
	    if (strncmp(*av, "and", strlen(*av)) != 0)
		goto bad;
	    continue;
	case 'o': /* or */
	    if (strncmp(*av, "or", strlen(*av)) != 0)
		goto bad;
	    or = 1;
	    continue;
	case '!': /* negate */
	    if (av[0][1] != '\0')
		goto bad;
	    not = 1;
	    continue;
	case 'c': /* command */
	    if (av[0][1] == '\0')
		errorx(1, "ambiguous expression \"%s\"", *av);
	    if (strncmp(*av, "cwd", strlen(*av)) == 0)
		type = ST_CWD;
	    else if (strncmp(*av, "command", strlen(*av)) == 0)
		type = ST_PATTERN;
	    else
		goto bad;
	    break;
	case 'f': /* from date */
	    if (strncmp(*av, "fromdate", strlen(*av)) != 0)
		goto bad;
	    type = ST_FROMDATE;
	    break;
	case 'g': /* runas group */
	    if (strncmp(*av, "group", strlen(*av)) != 0)
		goto bad;
	    type = ST_RUNASGROUP;
	    break;
	case 'r': /* runas user */
	    if (strncmp(*av, "runas", strlen(*av)) != 0)
		goto bad;
	    type = ST_RUNASUSER;
	    break;
	case 't': /* tty or to date */
	    if (av[0][1] == '\0')
		errorx(1, "ambiguous expression \"%s\"", *av);
	    if (strncmp(*av, "todate", strlen(*av)) == 0)
		type = ST_TODATE;
	    else if (strncmp(*av, "tty", strlen(*av)) == 0)
		type = ST_TTY;
	    else
		goto bad;
	    break;
	case 'u': /* user */
	    if (strncmp(*av, "user", strlen(*av)) != 0)
		goto bad;
	    type = ST_USER;
	    break;
	case '(': /* start sub-expression */
	    if (av[0][1] != '\0')
		goto bad;
	    if (stack_top + 1 == STACK_NODE_SIZE) {
		errorx(1, "too many parenthesized expressions, max %d",
		    STACK_NODE_SIZE);
	    }
	    node_stack[stack_top++] = sn;
	    type = ST_EXPR;
	    break;
	case ')': /* end sub-expression */
	    if (av[0][1] != '\0')
		goto bad;
	    /* pop */
	    if (--stack_top < 0)
		errorx(1, "unmatched ')' in expression");
	    if (node_stack[stack_top])
		sn->next = node_stack[stack_top]->next;
	    return(av - argv + 1);
	bad:
	default:
	    errorx(1, "unknown search term \"%s\"", *av);
	    /* NOTREACHED */
	}

	/* Allocate new search node */
	newsn = emalloc(sizeof(*newsn));
	newsn->next = NULL;
	newsn->type = type;
	newsn->or = or;
	newsn->negated = not;
	if (type == ST_EXPR) {
	    av += parse_expr(&newsn->u.expr, av + 1);
	} else {
	    if (*(++av) == NULL)
		errorx(1, "%s requires an argument", av[-1]);
#ifdef HAVE_REGCOMP
	    if (type == ST_PATTERN) {
		if (regcomp(&newsn->u.cmdre, *av, REG_EXTENDED|REG_NOSUB) != 0)
		    errorx(1, "invalid regex: %s", *av);
	    } else
#endif
	    if (type == ST_TODATE || type == ST_FROMDATE) {
		newsn->u.tstamp = get_date(*av);
		if (newsn->u.tstamp == -1)
		    errorx(1, "could not parse date \"%s\"", *av);
	    } else {
		newsn->u.ptr = *av;
	    }
	}
	not = or = 0; /* reset state */
	if (sn)
	    sn->next = newsn;
	else
	    *headp = newsn;
	sn = newsn;
    }
    if (stack_top)
	errorx(1, "unmatched '(' in expression");
    if (or)
	errorx(1, "illegal trailing \"or\"");
    if (not)
	errorx(1, "illegal trailing \"!\"");

    return(av - argv);
}

static int
match_expr(head, log)
    struct search_node *head;
    struct log_info *log;
{
    struct search_node *sn;
    int matched = 1, rc;

    for (sn = head; sn; sn = sn->next) {
	/* If we have no match, skip ahead to the next OR entry. */
	if (!matched && !sn->or)
	    continue;

	switch (sn->type) {
	case ST_EXPR:
	    matched = match_expr(sn->u.expr, log);
	    break;
	case ST_CWD:
	    matched = strcmp(sn->u.cwd, log->cwd) == 0;
	    break;
	case ST_TTY:
	    matched = strcmp(sn->u.tty, log->tty) == 0;
	    break;
	case ST_RUNASGROUP:
	    matched = strcmp(sn->u.runas_group, log->runas_group) == 0;
	    break;
	case ST_RUNASUSER:
	    matched = strcmp(sn->u.runas_user, log->runas_user) == 0;
	    break;
	case ST_USER:
	    matched = strcmp(sn->u.user, log->user) == 0;
	    break;
	case ST_PATTERN:
#ifdef HAVE_REGCOMP
	    rc = regexec(&sn->u.cmdre, log->cmd, 0, NULL, 0);
	    if (rc && rc != REG_NOMATCH) {
		char buf[BUFSIZ];
		regerror(rc, &sn->u.cmdre, buf, sizeof(buf));
		errorx(1, "%s", buf);
	    }
	    matched = rc == REG_NOMATCH ? 0 : 1;
#else
	    matched = strstr(log.cmd, sn->u.pattern) != NULL;
#endif
	    break;
	case ST_FROMDATE:
	    matched = log->tstamp >= sn->u.tstamp;
	    break;
	case ST_TODATE:
	    matched = log->tstamp <= sn->u.tstamp;
	    break;
	}
	if (sn->negated)
	    matched = !matched;
    }
    return(matched);
}

static int
list_session_dir(pathbuf, re, user, tty)
    char *pathbuf;
    REGEX_T *re;
    const char *user;
    const char *tty;
{
    FILE *fp;
    DIR *d;
    struct dirent *dp;
    char *buf = NULL, *cmd = NULL, *cwd = NULL, idstr[7], *cp;
    struct log_info li;
    size_t bufsize = 0, cwdsize = 0, cmdsize = 0, plen;

    plen = strlen(pathbuf);
    d = opendir(pathbuf);
    if (d == NULL && errno != ENOTDIR) {
	warning("cannot opendir %s", pathbuf);
	return(-1);
    }
    while ((dp = readdir(d)) != NULL) {
	if (NAMLEN(dp) != 2 || !isalnum((unsigned char)dp->d_name[0]) ||
	    !isalnum((unsigned char)dp->d_name[1]))
	    continue;

	/* open log file, print id and command */
	pathbuf[plen + 0] = '/';
	pathbuf[plen + 1] = dp->d_name[0];
	pathbuf[plen + 2] = dp->d_name[1];
	pathbuf[plen + 3] = '/';
	pathbuf[plen + 4] = 'l';
	pathbuf[plen + 5] = 'o';
	pathbuf[plen + 6] = 'g';
	pathbuf[plen + 7] = '\0';
	fp = fopen(pathbuf, "r");
	if (fp == NULL) {
	    warning("unable to open %s", pathbuf);
	    continue;
	}

	/*
	 * ID file has three lines:
	 *  1) a log info line
	 *  2) cwd
	 *  3) command with args
	 */
	if (getline(&buf, &bufsize, fp) == -1 ||
	    getline(&cwd, &cwdsize, fp) == -1 ||
	    getline(&cmd, &cmdsize, fp) == -1) {
	    fclose(fp);
	    continue;
	}
	fclose(fp);

	/* crack the log line: timestamp:user:runas_user:runas_group:tty */
	buf[strcspn(buf, "\n")] = '\0';
	if ((li.tstamp = atoi(buf)) == 0)
	    continue;

	if ((cp = strchr(buf, ':')) == NULL)
	    continue;
	*cp++ = '\0';
	li.user = cp;

	if ((cp = strchr(cp, ':')) == NULL)
	    continue;
	*cp++ = '\0';
	li.runas_user = cp;

	if ((cp = strchr(cp, ':')) == NULL)
	    continue;
	*cp++ = '\0';
	li.runas_group = cp;

	if ((cp = strchr(cp, ':')) == NULL)
	    continue;
	*cp++ = '\0';
	li.tty = cp;

	cwd[strcspn(cwd, "\n")] = '\0';
	li.cwd = cwd;

	cmd[strcspn(cmd, "\n")] = '\0';
	li.cmd = cmd;

	/* Match on search expression if there is one. */
	if (search_expr && !match_expr(search_expr, &li))
	    continue;

	/* Convert from /var/log/sudo-sessions/00/00/01 to 000001 */
	idstr[0] = pathbuf[plen - 5];
	idstr[1] = pathbuf[plen - 4];
	idstr[2] = pathbuf[plen - 2];
	idstr[3] = pathbuf[plen - 1];
	idstr[4] = pathbuf[plen + 1];
	idstr[5] = pathbuf[plen + 2];
	idstr[6] = '\0';
	printf("%s : %s : TTY=%s ; CWD=%s ; USER=%s ; ",
	    get_timestr(li.tstamp, 1), li.user, li.tty, li.cwd, li.runas_user);
	if (*li.runas_group)
	    printf("GROUP=%s ; ", li.runas_group);
	printf("TSID=%s ; COMMAND=%s\n", idstr, li.cmd);
    }
    return(0);
}

static int
list_sessions(argc, argv, pattern, user, tty)
    int argc;
    char **argv;
    const char *pattern;
    const char *user;
    const char *tty;
{
    DIR *d1, *d2;
    struct dirent *dp1, *dp2;
    REGEX_T rebuf, *re = NULL;
    size_t sdlen;
    char pathbuf[PATH_MAX];

    /* Parse search expression if present */
    parse_expr(&search_expr, argv);

    d1 = opendir(session_dir);
    if (d1 == NULL)
	error(1, "unable to open %s", session_dir);

#ifdef HAVE_REGCOMP
    /* optional regex */
    if (pattern) {
	re = &rebuf;
	if (regcomp(re, pattern, REG_EXTENDED|REG_NOSUB) != 0)
	    errorx(1, "invalid regex: %s", pattern);
    }
#else
    re = (char *) pattern;
#endif /* HAVE_REGCOMP */

    sdlen = strlcpy(pathbuf, session_dir, sizeof(pathbuf));
    if (sdlen + sizeof("/00/00/00/log") >= sizeof(pathbuf)) {
	errno = ENAMETOOLONG;
	error(1, "%s/00/00/00/log", session_dir);
    }

    /*
     * Three levels of directory, e.g. 00/00/00 .. ZZ/ZZ/ZZ
     * We do a depth-first traversal.
     */
    while ((dp1 = readdir(d1)) != NULL) {
	if (NAMLEN(dp1) != 2 || !isalnum((unsigned char)dp1->d_name[0]) ||
	    !isalnum((unsigned char)dp1->d_name[1]))
	    continue;

	pathbuf[sdlen + 0] = '/';
	pathbuf[sdlen + 1] = dp1->d_name[0];
	pathbuf[sdlen + 2] = dp1->d_name[1];
	pathbuf[sdlen + 3] = '\0';
	d2 = opendir(pathbuf);
	if (d2 == NULL)
	    continue;

	while ((dp2 = readdir(d2)) != NULL) {
	    if (NAMLEN(dp2) != 2 || !isalnum((unsigned char)dp2->d_name[0]) ||
		!isalnum((unsigned char)dp2->d_name[1]))
		continue;

	    pathbuf[sdlen + 3] = '/';
	    pathbuf[sdlen + 4] = dp2->d_name[0];
	    pathbuf[sdlen + 5] = dp2->d_name[1];
	    pathbuf[sdlen + 6] = '\0';
	    list_session_dir(pathbuf, re, user, tty);
	}
	closedir(d2);
    }
    closedir(d1);
    return(0);
}

/*
 * Check input for ' ', '<', '>'
 * pause, slow, fast
 */
static void
check_input(ttyfd, speed)
    int ttyfd;
    double *speed;
{
    fd_set *fdsr;
    int nready, paused = 0;
    struct timeval tv;
    char ch;
    ssize_t n;

    fdsr = (fd_set *)emalloc2(howmany(ttyfd + 1, NFDBITS), sizeof(fd_mask));

    for (;;) {
	FD_SET(ttyfd, fdsr);
	tv.tv_sec = 0;
	tv.tv_usec = 0;

	nready = select(ttyfd + 1, fdsr, NULL, NULL, paused ? NULL : &tv);
	if (nready != 1)
	    break;
	n = read(ttyfd, &ch, 1);
	if (n == 1) {
	    if (paused) {
		paused = 0;
		continue;
	    }
	    switch (ch) {
	    case ' ':
		paused = 1;
		break;
	    case '<':
		*speed /= 2;
		break;
	    case '>':
		*speed *= 2;
		break;
	    }
	}
    }
    free(fdsr);
}

/*
 * Parse a timing line, which is formatted as:
 *	index sleep_time num_bytes
 * Where index is IOFD_*, sleep_time is the number of seconds to sleep
 * before writing the data and num_bytes is the number of bytes to output.
 * Returns 1 on success and 0 on failure.
 */
static int
parse_timing(buf, decimal, idx, seconds, nbytes)
    const char *buf;
    const char *decimal;
    int *idx;
    double *seconds;
    size_t *nbytes;
{
    unsigned long ul;
    long l;
    double d, fract = 0;
    char *cp, *ep;

    /* Parse index */
    ul = strtoul(buf, &ep, 10);
    if (ul > IOFD_MAX)
	goto bad;
    *idx = (int)ul;
    for (cp = ep + 1; isspace((unsigned char) *cp); cp++)
	continue;

    /*
     * Parse number of seconds.  Sudo logs timing data in the C locale
     * but this may not match the current locale so we cannot use strtod().
     * Furthermore, sudo < 1.7.4 logged with the user's locale so we need
     * to be able to parse those logs too.
     */
    errno = 0;
    l = strtol(cp, &ep, 10);
    if ((errno == ERANGE && (l == LONG_MAX || l == LONG_MIN)) ||
	l < 0 || l > INT_MAX ||
	(*ep != '.' && strncmp(ep, decimal, strlen(decimal)) != 0)) {
	goto bad;
    }
    *seconds = (double)l;
    cp = ep + (*ep == '.' ? 1 : strlen(decimal));
    d = 10.0;
    while (isdigit((unsigned char) *cp)) {
	fract += (*cp - '0') / d;
	d *= 10;
	cp++;
    }
    *seconds += fract;
    while (isspace((unsigned char) *cp))
	cp++;

    errno = 0;
    ul = strtoul(cp, &ep, 10);
    if (errno == ERANGE && ul == ULONG_MAX)
	goto bad;
    *nbytes = (size_t)ul;

    return 1;
bad:
    return 0;
}

static void
usage()
{
    fprintf(stderr,
	"usage: %s [-d directory] [-m max_wait] [-s speed_factor] ID\n",
	getprogname());
    fprintf(stderr,
	"usage: %s [-d directory] -l [search expression]\n",
	getprogname());
    exit(1);
}

/*
 * Cleanup hook for error()/errorx()
  */
void
cleanup(signo)
    int signo;
{
    term_restore(STDIN_FILENO, 0);
    if (signo)
	kill(getpid(), signo);
}