/* * Copyright 1990, 1998 The Open Group * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that * copyright notice and this permission notice appear in supporting * documentation. * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Except as contained in this notice, the name of The Open Group shall * not be used in advertising or otherwise to promote the sale, use or * other dealings in this Software without prior written authorization * from The Open Group. * */ /* * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. */ /* * Author: Keith Packard, MIT X Consortium * Lastlog support and dynamic utmp entry allocation * by Andreas Stolcke */ /* * sessreg * * simple wtmp/utmp frobber * * usage: sessreg [ -w ] [ -u ] * [ -l ] * [ -L ] / #ifdef USE_LASTLOG * [ -h ] / BSD only * [ -s ] [ -x Xservers-file ] / BSD only * [ -t ] / BSD only * [ -a ] [ -d ] user-name * * one of -a or -d must be specified */ #include "sessreg.h" #include #include #include #include #include #ifdef USE_UTMP static void set_utmp (struct utmp *u, char *line, char *user, char *host, time_t date, int addp); #endif #ifdef USE_UTMPX static void set_utmpx (struct utmpx *u, const char *line, const char *user, const char *host, time_t date, int addp); #endif static int wflag, uflag, lflag; static const char *wtmp_file, *utmp_file; #ifdef USE_UTMPX #ifdef HAVE_UPDWTMPX static const char *wtmpx_file = NULL; #endif #ifdef HAVE_UTMPXNAME static const char *utmpx_file = NULL; #endif #endif static int utmp_none, wtmp_none; /* * BSD specific variables. To make life much easier for Xstartup/Xreset * maintainers, these arguments are accepted but ignored for sysV */ static int hflag, xflag, tflag; static char *host_name = NULL; #if defined(USE_UTMP) && !defined(HAVE_PUTUTLINE) static int sflag; static int slot_number; #endif static char *xservers_file, *ttys_file; static char *user_name; static int aflag, dflag; #ifdef USE_LASTLOG static const char *llog_file; static int llog_none, Lflag; #endif static char *program_name; #if defined(USE_UTMP) && !defined(HAVE_PUTUTLINE) static int findslot (char *line_name, char *host_name, int addp, int slot); static int Xslot (char *ttys_file, char *servers_file, char *tty_line, char *host_name, int addp); #endif static int usage (int x) { if (x) { fprintf (stderr, "%s: usage %s {-a -d} [-w wtmp-file] [-u utmp-file]" #ifdef USE_LASTLOG " [-L lastlog-file]" #endif "\n" " [-t ttys-file] [-l line-name] [-h host-name]\n" " [-s slot-number] [-x servers-file] user-name\n", program_name, program_name); exit (1); } return x; } static char * getstring (char ***avp, int *flagp) { char **a = *avp; usage ((*flagp)++); if (*++*a) return *a; ++a; usage (!*a); *avp = a; return *a; } #if defined(USE_UTMP) && !defined(HAVE_PUTUTLINE) static int syserr (int x, const char *s) { if (x == -1) { perror (s); exit (1); } return x; } #endif static int sysnerr (int x, const char *s) { if (x == 0) { perror (s); exit (1); } return x; } int main (int argc, char **argv) { #if defined(USE_UTMP) && !defined(HAVE_PUTUTLINE) int utmp; #endif #ifndef USE_UTMPX int wtmp; #endif time_t current_time; #ifdef USE_UTMP struct utmp utmp_entry; #endif #ifdef USE_UTMPX struct utmpx utmpx_entry; #endif char * line = NULL; program_name = argv[0]; while (*++argv && **argv == '-') { switch (*++*argv) { case 'w': wtmp_file = getstring (&argv, &wflag); if (!strcmp (wtmp_file, "none")) wtmp_none = 1; break; case 'u': utmp_file = getstring (&argv, &uflag); if (!strcmp (utmp_file, "none")) utmp_none = 1; break; #ifdef USE_LASTLOG case 'L': llog_file = getstring (&argv, &Lflag); if (!strcmp (llog_file, "none")) llog_none = 1; break; #endif case 't': ttys_file = getstring (&argv, &tflag); break; case 'l': line = getstring (&argv, &lflag); break; case 'h': host_name = getstring (&argv, &hflag); break; case 's': #if defined(USE_UTMP) && !defined(HAVE_PUTUTLINE) slot_number = atoi (getstring (&argv, &sflag)); #endif break; case 'x': xservers_file = getstring (&argv, &xflag); break; case 'a': aflag++; break; case 'd': dflag++; break; default: usage (1); } } usage (!(user_name = *argv++)); usage (*argv != NULL); /* * complain if neither aflag nor dflag are set, * or if both are set. */ usage (!(aflag ^ dflag)); usage (xflag && !lflag); /* set up default file names */ if (!wflag) { wtmp_file = WTMP_FILE; #if defined(USE_UTMPX) && defined(HAVE_UPDWTMPX) wtmpx_file = WTMPX_FILE; #endif } if (!uflag) { utmp_file = UTMP_FILE; #if defined(USE_UTMPX) && defined(HAVE_UTMPXNAME) utmpx_file = UTMPX_FILE; #endif } #ifdef USE_LASTLOG if (!Lflag) llog_file = LLOG_FILE; #endif #if defined(USE_UTMP) && !defined(HAVE_PUTUTLINE) if (!tflag) ttys_file = TTYS_FILE; if (!sflag && !utmp_none) { if (xflag) sysnerr (slot_number = Xslot (ttys_file, xservers_file, line, host_name, aflag), "Xslot"); else sysnerr (slot_number = ttyslot (), "ttyslot"); } #endif if (!lflag) { sysnerr ((line = ttyname (0)) != NULL, "ttyname"); if (strncmp(line, "/dev/", 5) == 0) line += 5; } time (¤t_time); #ifdef USE_UTMP set_utmp (&utmp_entry, line, user_name, host_name, current_time, aflag); #endif #ifdef USE_UTMPX /* need to set utmpxname() before calling set_utmpx() for UtmpxIdOpen to work */ # ifdef HAVE_UTMPXNAME if (utmpx_file != NULL) { utmpxname (utmpx_file); } # endif set_utmpx (&utmpx_entry, line, user_name, host_name, current_time, aflag); #endif if (!utmp_none) { #ifdef USE_UTMPX # ifdef HAVE_UTMPXNAME if (utmpx_file != NULL) # endif { setutxent (); (void) getutxid (&utmpx_entry); pututxline (&utmpx_entry); endutxent (); } #endif #ifdef USE_UTMP # ifdef HAVE_PUTUTLINE utmpname (utmp_file); setutent (); (void) getutid (&utmp_entry); pututline (&utmp_entry); endutent (); # else utmp = open (utmp_file, O_RDWR); if (utmp != -1) { syserr ((int) lseek (utmp, (long) slot_number * sizeof (struct utmp), 0), "lseek"); sysnerr (write (utmp, (char *) &utmp_entry, sizeof (utmp_entry)) == sizeof (utmp_entry), "write utmp entry"); close (utmp); } # endif #endif /* USE_UTMP */ } if (!wtmp_none) { #ifdef USE_UTMPX # ifdef HAVE_UPDWTMPX if (wtmpx_file != NULL) { updwtmpx(wtmpx_file, &utmpx_entry); } # endif #else wtmp = open (wtmp_file, O_WRONLY|O_APPEND); if (wtmp != -1) { sysnerr (write (wtmp, (char *) &utmp_entry, sizeof (utmp_entry)) == sizeof (utmp_entry), "write wtmp entry"); close (wtmp); } #endif } #ifdef USE_LASTLOG if (aflag && !llog_none) { int llog; struct passwd *pwd = getpwnam(user_name); sysnerr( pwd != NULL, "get user id"); llog = open (llog_file, O_RDWR); if (llog != -1) { struct lastlog ll; sysnerr (lseek(llog, (long) (pwd->pw_uid*sizeof(ll)), 0) != -1, "seeking lastlog entry"); memset(&ll, 0, sizeof(ll)); ll.ll_time = current_time; if (line) (void) strncpy (ll.ll_line, line, sizeof (ll.ll_line)); if (host_name) (void) strncpy (ll.ll_host, host_name, sizeof (ll.ll_host)); sysnerr (write (llog, (char *) &ll, sizeof (ll)) == sizeof (ll), "write lastlog entry"); close (llog); } } #endif return 0; } /* * fill in the appropriate records of the utmp entry */ #ifdef USE_UTMP static void set_utmp (struct utmp *u, char *line, char *user, char *host, time_t date, int addp) { memset (u, 0, sizeof (*u)); if (line) (void) strncpy (u->ut_line, line, sizeof (u->ut_line)); else memset (u->ut_line, 0, sizeof (u->ut_line)); if (addp && user) (void) strncpy (u->ut_name, user, sizeof (u->ut_name)); else memset (u->ut_name, 0, sizeof (u->ut_name)); #ifdef HAVE_STRUCT_UTMP_UT_ID if (line) { size_t i; /* * this is a bit crufty, but * follows the apparent conventions in * the ttys file. ut_id is only 4 bytes * long, and the last 4 bytes of the line * name are written into it, left justified. */ i = strlen (line); if (i >= sizeof (u->ut_id)) i -= sizeof (u->ut_id); else i = 0; (void) strncpy (u->ut_id, line + i, sizeof (u->ut_id)); } else memset (u->ut_id, 0, sizeof (u->ut_id)); #endif #ifdef HAVE_STRUCT_UTMP_UT_PID if (addp) u->ut_pid = getppid (); else u->ut_pid = 0; #endif #ifdef HAVE_STRUCT_UTMP_UT_TYPE if (addp) u->ut_type = USER_PROCESS; else u->ut_type = DEAD_PROCESS; #endif #ifdef HAVE_STRUCT_UTMP_UT_HOST if (addp && host) (void) strncpy (u->ut_host, host, sizeof (u->ut_host)); else memset (u->ut_host, 0, sizeof (u->ut_host)); #endif u->ut_time = date; } #endif /* USE_UTMP */ #ifdef USE_UTMPX static int UtmpxIdOpen( char *utmpId ) { struct utmpx *u; /* pointer to entry in utmp file */ int status = 1; /* return code */ setutxent(); while ( (u = getutxent()) != NULL ) { if ( (strncmp(u->ut_id, utmpId, 4) == 0 ) && u->ut_type != DEAD_PROCESS ) { status = 0; break; } } endutxent(); return (status); } static void set_utmpx (struct utmpx *u, const char *line, const char *user, const char *host, time_t date, int addp) { static const char letters[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; if (line) { if(strcmp(line, ":0") == 0) (void) strcpy(u->ut_line, "console"); else (void) strncpy (u->ut_line, line, sizeof (u->ut_line)); strncpy(u->ut_host, line, sizeof(u->ut_host)); #ifdef HAVE_STRUCT_UTMPX_UT_SYSLEN u->ut_syslen = strlen(line); #endif } else memset (u->ut_line, 0, sizeof (u->ut_line)); if (addp && user) (void) strncpy (u->ut_user, user, sizeof (u->ut_user)); else memset (u->ut_user, 0, sizeof (u->ut_user)); if (line) { size_t i; /* * this is a bit crufty, but * follows the apparent conventions in * the ttys file. ut_id is only 4 bytes * long, and the last 4 bytes of the line * name are written into it, left justified. */ i = strlen (line); if (i >= sizeof (u->ut_id)) i -= sizeof (u->ut_id); else i = 0; (void) strncpy (u->ut_id, line + i, sizeof (u->ut_id)); /* make sure there is no entry using identical ut_id */ if (!UtmpxIdOpen(u->ut_id) && addp) { int limit = sizeof(letters) - 1; int t = 0; u->ut_id[1] = line[i]; u->ut_id[2] = line[i+1]; u->ut_id[3] = line[i+2]; do { u->ut_id[0] = letters[t]; t++; } while (!UtmpxIdOpen(u->ut_id) && (t < limit)); } if (!addp && strstr(line, ":") != NULL) { struct utmpx *tmpu; while ( (tmpu = getutxent()) != NULL ) { if ( (strcmp(tmpu->ut_host, line) == 0 ) && tmpu->ut_type != DEAD_PROCESS ) { strncpy(u->ut_id, tmpu->ut_id, sizeof(u->ut_id)); break; } } endutxent(); } } else memset (u->ut_id, 0, sizeof (u->ut_id)); if (addp) { u->ut_pid = getppid (); u->ut_type = USER_PROCESS; } else { u->ut_pid = 0; u->ut_type = DEAD_PROCESS; } u->ut_tv.tv_sec = date; u->ut_tv.tv_usec = 0; } #endif /* USE_UTMPX */ #if defined(USE_UTMP) && !defined(HAVE_PUTUTLINE) /* * compute the slot-number for an X display. This is computed * by counting the lines in /etc/ttys and adding the line-number * that the display appears on in Xservers. This is a poor * design, but is limited by the non-existant interface to utmp. * If host_name is non-NULL, assume it contains the display name, * otherwise use the tty_line argument (i.e., the tty name). */ static int Xslot (char *ttys_file, char *servers_file, char *tty_line, char *host_name, int addp) { FILE *ttys, *servers; int c; int slot = 1; int column0 = 1; char servers_line[1024]; char disp_name[512]; int len; char *pos; /* remove screen number from the display name */ memset(disp_name, 0, sizeof(disp_name)); strncpy(disp_name, host_name ? host_name : tty_line, sizeof(disp_name)-1); pos = strrchr(disp_name, ':'); if (pos) { pos = strchr(pos, '.'); if (pos) *pos = '\0'; } sysnerr ((int)(long)(ttys = fopen (ttys_file, "r")), ttys_file); while ((c = getc (ttys)) != EOF) if (c == '\n') { ++slot; column0 = 1; } else column0 = 0; if (!column0) ++slot; (void) fclose (ttys); sysnerr ((int)(long)(servers = fopen (servers_file, "r")), servers_file); len = strlen (disp_name); column0 = 1; while (fgets (servers_line, sizeof (servers_line), servers)) { if (column0 && *servers_line != '#') { if (!strncmp (disp_name, servers_line, len) && (servers_line[len] == ' ' || servers_line[len] == '\t')) return slot; ++slot; } if (servers_line[strlen(servers_line)-1] != '\n') column0 = 0; else column0 = 1; } /* * display not found in Xservers file - allocate utmp entry dinamically */ return findslot (tty_line, host_name, addp, slot); } /* * find a free utmp slot for the X display. This allocates a new entry * past the regular tty entries if necessary, reusing existing entries * (identified by (line,hostname)) if possible. */ static int findslot (char *line_name, char *host_name, int addp, int slot) { int utmp; struct utmp entry; int found = 0; int freeslot = -1; syserr(utmp = open (utmp_file, O_RDONLY), "open utmp"); /* * first, try to locate a previous entry for this display * also record location of a free slots in case we need a new one */ syserr ((int) lseek (utmp, (long) slot * sizeof (struct utmp), 0), "lseek"); if (!host_name) host_name = ""; while (read (utmp, (char *) &entry, sizeof (entry)) == sizeof (entry)) { if (strncmp(entry.ut_line, line_name, sizeof(entry.ut_line)) == 0 #ifdef HAVE_STRUCT_UTMP_UT_HOST && strncmp(entry.ut_host, host_name, sizeof(entry.ut_host)) == 0 #endif ) { found = 1; break; } if (freeslot < 0 && *entry.ut_name == '\0') freeslot = slot; ++slot; } close (utmp); if (found) return slot; else if (!addp) return 0; /* trying to delete a non-existing entry */ else if (freeslot < 0) return slot; /* first slot past current entries */ else return freeslot; } #endif