From 76b87c039ba8d20add4f52ba43f3471fd92e210b Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Thu, 29 May 1997 12:06:58 +0000 Subject: Update. 1997-05-29 12:48 Ulrich Drepper * io/ftw.c: Complete rewrite. Add implementation of `nftw'. * io/ftw.h: Update for new implementation and XPG4.2. * login/Makefile: Update for UTMP daemon implementation. Update resolver code to bind-4.9.6-T1A. * resolv/Banner: Update. * nss/digits_dots.c: Adapt text address matching to T1A. * nss/nss_files/files-hosts.c: Always use inet_pton. * resolv/base64.c (b64_pton): Follow T1A but don't use this code since it would lead to warnings. * resolv/gethnamaddr.c (getanswer): Test host name for maximal length at several places. * resolv/inet_net_pton.c (inet_net_pton_ipv4): Correct typo in comment. * resolv/res_comp.c (dn_expand): Check for overflow. (dn_comp): Likewise. * resolv/res_debug.c (precsize_aton): Better implementation. * resolv/res_init.c (res_init): Make `buf' of size MAXDNAME. * resolv/res_send.c (res_send): Check for overflow in descriptor set. * resolv/nss_dns/dns-host.c (getanswer_r): Test host name for maximal length at several places. 1997-05-29 12:51 Mark Kettenis * login/utmp-private.h (struct utfuncs): Add one more parameter to updwtmp function. Declare all three function jump tables. * login/utmp.h: Declare __utmpname. * login/getutent_r.c: Remove db backend and provide support for utmpd backend. * login/login.c: Use `updwtmp' function insteead of writing the record ourself. * login/logwtmp.c: Move `updwtmp' function to... * login/updwtmp.c: ...here. New file. * login/utmp_db.h: Removed. * login/utmp_file.c: Add updwtmp function to write to file. * login/utmp_daemon.c: New file. Daemon backend. * login/utmpname.c: New file. Implementation of utmpname function. * login/utmpdump.c: New file. Tool to dump utmp-like files. * login/utmpd/connection.c: New file. * login/utmpd/database.c: New file. * login/utmpd/error.c: New file. * login/utmpd/request.c: New file. * login/utmpd/utmpd-private.h: New file. * login/utmpd/utmpd.c: New file. * login/utmpd/utmpd.h: New file. * login/utmpd/xtmp.c: New file. * login/utmpd/xtmp.h: New file. 1997-05-29 12:28 Jim Meyering * time/strftime.c: Correct/normalize indentation in cpp directives. 1997-05-28 20:43 Philip Blundell * nis/nis_error.c: Include to fix warning. * nis/nis_print.c: Likewise. * nis/nss_nisplus/nisplus-hosts.c: Arg 3 of map_v4v6_hostent is int* not size_t*. 1997-05-28 21:56 Andreas Jaeger * math/cmathcalls.h: Correct typo in comment. * inet/netinet/icmp6.h: Include for in6_addr. * sysdeps/unix/sysv/linux/netinet/ip_fw.h: Include for IFNAMSIZ. * sysdeps/unix/sysv/linux/net/ppp_defs.h: Include for time_t. * login/pty.h: Include for definition of struct winsize. * misc/regexp.h (compile): Correct typo. * argp/argp.h: Put extern before __const in defintion of argp_program_bug_address. 1997-05-29 00:20 Ulrich Drepper * sysdeps/wordsize-32/inttypes.h: Correct names of unsigned fast and least types. Correct names of ?INT_FAST*_{MIN,MAX} macros. * sysdeps/wordsize-64/inttypes.h: Likewise. Reported by Andreas Jaeger . 1997-05-28 22:51 Ulrich Drepper * sysdeps/unix/Makefile (make-ioctls-CFLAGS): Use generic ttydefaults.h file instead of non-existing version in termios/sys. Reported by Zack Weinberg . * time/strptime.c (strptime_internal, case 'Y'): Restrict year number to four digits and to representable range for 4 byte time_t values. Patch by H.J. Lu . 1997-05-28 18:19 Philip Blundell * posix/execl.c: Include to avoid warning. 1997-05-27 18:19 Andreas Jaeger * math/libm-test.c: Implement testing of inlined functions, make output nicer, update comments. * math/test-idouble.c: New file. Frontend for double tests of inlined functions. * math/test-ildoubl.c: New file. Frontend for long double tests of inlined functions. * math/test-ifloat.c: New file. Frontend for float tests of inlined functions. * math/test-longdouble.c: Rename to... * math/test-ldouble.c: ...this. * math/Makefile: Add rules for new test programs, change rules for renaming of longdouble test. 1997-05-20 15:50 H.J. Lu * sunrpc/rpc/svc.h (__dispatch_fn_t): New. (svc_register): Use __dispatch_fn_t in prototype. 1997-05-28 17:02 Ulrich Drepper * sysdeps/generic/bzero.c (bzero): Fix typo. Patch by Witek Wnuk . 1997-05-27 12:00 Andreas Jaeger * sysdeps/generic/vtimes.c: Use ISO C declaration style. * sysdeps/unix/bsd/ualarm.c: Include for prototype. * sysdeps/generic/memccpy.c: Include for prototype. * signal/tst-signal.c (handler): Correct function declaration to avoid warning. * stdlib/testsort.c (compare): Likewise. * string/tester.c: Likewise. 1997-05-27 14:16 Miles Bader * argp-help.c (argp_args_usage): Supply correct argp to filter_doc. 1997-05-27 17:51 Andreas Schwab * db/hash/extern.h, db/hash/hash.c, db/hash/hash.h, db/hash/hash_log2.c: Rename __log2 to __hash_log2 to avoid clash with libm. 1997-05-27 14:47 Andreas Schwab * sysdeps/m68k/fpu/e_atan2.c: Fix missing negate. Use __m81_test instead of explicit comparisons. 1997-05-26 18:36 Andreas Schwab * inet/netinet/icmp6.h: Remove use of which has no place in a generic header and is no user include file. --- login/utmpd/database.c | 516 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 516 insertions(+) create mode 100644 login/utmpd/database.c (limited to 'login/utmpd/database.c') diff --git a/login/utmpd/database.c b/login/utmpd/database.c new file mode 100644 index 0000000000..e31e0d9dae --- /dev/null +++ b/login/utmpd/database.c @@ -0,0 +1,516 @@ +/* Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Mark Kettenis , 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#include "utmpd-private.h" +#include "xtmp.h" + + +/* Prototypes for the local functions. */ +static int initialize_database (utmp_database *database); +static int store_state_entry (utmp_database *database, int old_position, + const struct utmp *old_entry); +static int store_process_entry (utmp_database *database, int old_position, + const struct utmp *old_entry); +static int replace_entry (utmp_database *database, int old_position, + int new_position, const struct utmp *entry); +static int store_entry (utmp_database *database, int position, + const struct utmp *entry); +static int proc_utmp_eq (const struct utmp *entry, const struct utmp *match); +static int get_mtime (const char *file, time_t *timer); + + +/* Open the database specified by FILE and merge it with the + contents of the old format file specified by OLD_FILE. Returns a + pointer to a newly allocated structure describing the database, or + NULL on error. */ +utmp_database * +open_database (const char *file, const char *old_file) +{ + utmp_database *database; + + /* Allocate memory. */ + database = (utmp_database *) malloc (sizeof (utmp_database)); + if (database == NULL) + return NULL; + + memset (database, 0, sizeof (utmp_database)); + + /* Open database. */ + database->fd = open (file, O_RDWR); + if (database->fd < 0) + goto fail; + + database->old_fd = open (old_file, O_RDWR); + if (database->old_fd < 0) + goto fail; + + if ((file && !(database->file = strdup (file))) + || (old_file && !(database->old_file = strdup (old_file)))) + goto fail; + + if (initialize_database (database) < 0 + || synchronize_database (database) < 0) + goto fail; + + return database; + +fail: + close_database (database); + return NULL; +} + +/* Synchronize DATABASE. */ +int +synchronize_database (utmp_database *database) +{ + assert (database); + + /* Check if there is a file in the old format, that we have to + synchronize with. */ + if (database->old_file) + { + time_t curtime; + time_t mtime; + + curtime = time (NULL); + + if (get_mtime (database->old_file, &mtime) < 0) + return -1; + + if (mtime >= database->mtime) + { + int position = 0; + struct utmp entry; + struct utmp old_entry; + + while (1) + { + if (read_old_entry (database, position, &old_entry) < 0) + break; + + if (read_entry (database, position, &entry) < 0 + || !compare_entry (&old_entry, &entry)) + { + if (write_entry (database, position, &old_entry) < 0) + return -1; + } + + position++; + } + + database->mtime = curtime; + } + + } + + return 0; +} + + +/* Close DATABASE. */ +void +close_database (utmp_database *database) +{ + assert (database); + + if (database->fd >= 0) + close (database->fd); + + if (database->old_fd >= 0) + close (database->old_fd); + + /* Free allocated memory. */ + if (database->file) + free (database->file); + if (database->old_file) + free (database->old_file); + free (database); +} + + +/* Read the entry at POSITION in DATABASE and store the result in + ENTRY. Returns 0 if successful, -1 if not. */ +int +read_entry (utmp_database *database, int position, struct utmp *entry) +{ + ssize_t nbytes; + off_t offset; + + offset = position * sizeof (struct utmp); + if (lseek (database->fd, offset, SEEK_SET) < 0) + return -1; + + nbytes = read (database->fd, entry, sizeof (struct utmp)); + if (nbytes != sizeof (struct utmp)) + return -1; + + return 0; +} + + +/* Write ENTRY at POSITION in DATABASE. Returns 0 if successful, -1 + on error. */ +int +write_entry (utmp_database *database, int position, + const struct utmp *entry) +{ + int result = -1; + struct flock fl; + ssize_t nbytes; + off_t offset; + + /* Try to lock the file. */ + memset (&fl, 0, sizeof (struct flock)); + fl.l_type = F_WRLCK; + fl.l_whence = SEEK_SET; + fcntl (database->fd, F_SETLKW, &fl); + + offset = position * sizeof (struct utmp); + if (lseek (database->fd, offset, SEEK_SET) < 0) + goto fail; + + nbytes = write (database->fd, entry, sizeof (struct utmp)); + if (nbytes != sizeof (struct utmp)) + { + ftruncate (database->fd, offset); + goto fail; + } + + result = 0; + +fail: + /* And unlock the file. */ + fl.l_type = F_UNLCK; + fcntl (database->fd, F_SETLKW, &fl); + + return result; +} + + +/* Append ENTRY to DATABASE. Returns the position of the appended + entry if successful, or -1 on error. */ +int +append_entry (utmp_database *database, const struct utmp *entry) +{ + int result = -1; + struct flock fl; + ssize_t nbytes; + off_t offset; + + /* Try to lock the file. */ + memset (&fl, 0, sizeof (struct flock)); + fl.l_type = F_WRLCK; + fl.l_whence = SEEK_SET; + fcntl (database->fd, F_SETLKW, &fl); + + offset = lseek (database->fd, 0, SEEK_END); + if (offset % sizeof (struct utmp) != 0) + { + offset -= offset % sizeof (struct utmp); + ftruncate (database->fd, offset); + + if (lseek (database->fd, 0, SEEK_END) < 0) + goto fail; + } + + nbytes = write (database->fd, entry, sizeof (struct utmp)); + if (nbytes != sizeof (struct utmp)) + { + ftruncate (database->fd, offset); + goto fail; + } + + result = offset / sizeof (struct utmp); + +fail: + /* And unlock the file. */ + fl.l_type = F_UNLCK; + fcntl (database->fd, F_SETLKW, &fl); + + return result; +} + + +int +read_old_entry (utmp_database *database, int position, + struct utmp *entry) +{ + struct xtmp old_entry; + ssize_t nbytes; + off_t offset; + + offset = position * sizeof (struct xtmp); + if (lseek (database->old_fd, offset, SEEK_SET) < 0) + return -1; + + nbytes = read (database->old_fd, &old_entry, sizeof (struct xtmp)); + if (nbytes != sizeof (struct xtmp)) + return -1; + + xtmp_to_utmp (&old_entry, entry); + return 0; +} + + +int +write_old_entry (utmp_database *database, int position, + const struct utmp *entry) +{ + struct xtmp old_entry; + ssize_t nbytes; + off_t offset; + + utmp_to_xtmp (entry, &old_entry); + + offset = position * sizeof (struct xtmp); + if (lseek (database->old_fd, offset, SEEK_SET) < 0) + return -1; + + nbytes = write (database->old_fd, &old_entry, sizeof (struct xtmp)); + if (nbytes != sizeof (struct xtmp)) + return -1; + + return 0; +} + + +/* Initialize DATABASE. */ +static int +initialize_database (utmp_database *database) +{ + struct utmp entry; + int position = 0; + + assert (database); + + /* Check if there is a file in the old format to read. */ + if (database->old_file) + { + while (1) + { + if (read_old_entry (database, position, &entry) < 0) + break; + +#if _HAVE_UT_TYPE - 0 + /* If the login type is one of RUN_LVL, BOOT_TIME, OLD_TIME or + NEW_TIME, search for an entry of the same type in the + database, and replace it if the entry in the file is newer. */ + if (entry.ut_type == RUN_LVL || entry.ut_type == BOOT_TIME + || entry.ut_type == OLD_TIME || entry.ut_type == NEW_TIME) + { + if (store_state_entry (database, position, &entry) < 0) + return -1; + } + else +#endif + { + if (store_process_entry (database, position, &entry) < 0) + return -1; + } + + /* Update position. */ + position++; + } + + while (1) + { + if (read_entry (database, position, &entry) < 0) + break; + + if (write_old_entry (database, position, &entry) < 0) + return -1; + + /* Update position. */ + position++; + } + } + + return 0; +} + + +static int +store_state_entry (utmp_database *database, int old_position, + const struct utmp *old_entry) +{ + struct utmp new_entry; + int new_position = 0; + int found = 0; + + assert (old_entry->ut_type == RUN_LVL + || old_entry->ut_type == BOOT_TIME + || old_entry->ut_type == OLD_TIME + || old_entry->ut_type == NEW_TIME); + + while (!found) + { + /* Read the next entry. */ + if (read_entry (database, new_position, &new_entry) < 0) + break; + + if (old_entry->ut_type == new_entry.ut_type) + { + found = 1; + continue; + } + + /* Update position. */ + new_position++; + } + + if (found) + { + const struct utmp *entry; + + if (old_entry->ut_time > new_entry.ut_time) + entry = old_entry; + else + entry = &new_entry; + + return replace_entry (database, old_position, new_position, entry); + } + + return store_entry (database, old_position, old_entry); +} + + +static int +store_process_entry (utmp_database *database, int old_position, + const struct utmp *old_entry) +{ + struct utmp new_entry; + int new_position = 0; + int found = 0; + + while (!found) + { + /* Read the next entry. */ + if (read_entry (database, new_position, &new_entry) < 0) + break; + + if (proc_utmp_eq (old_entry, &new_entry)) + { + found = 1; + continue; + } + + /* Update position. */ + new_position++; + } + + if (found) + { + const struct utmp *entry; + + if (old_entry->ut_time > new_entry.ut_time) + entry = old_entry; + else + entry = &new_entry; + + return replace_entry (database, old_position, new_position, entry); + } + + return store_entry (database, old_position, old_entry); +} + + +static int +replace_entry (utmp_database *database, int old_position, int new_position, + const struct utmp *entry) +{ + struct utmp tmp; + + if (read_entry (database, old_position, &tmp) < 0 + || write_entry (database, old_position, entry) < 0 + || write_entry (database, new_position, &tmp) < 0) + return -1; + + return 0; +} + + +static int +store_entry (utmp_database *database, int position, + const struct utmp *entry) +{ + struct utmp tmp; + + if (read_entry (database, position, &tmp) < 0) + return write_entry (database, position, entry); + + if (write_entry (database, position, entry) < 0 + || append_entry (database, &tmp) < 0) + return -1; + + return 0; +} + + +/* This function is identical to the one in login/utmp_file.c. */ +static int +proc_utmp_eq (const struct utmp *entry, const struct utmp *match) +{ + return + ( +#if _HAVE_UT_TYPE - 0 + (entry->ut_type == INIT_PROCESS + || entry->ut_type == LOGIN_PROCESS + || entry->ut_type == USER_PROCESS + || entry->ut_type == DEAD_PROCESS) + && + (match->ut_type == INIT_PROCESS + || match->ut_type == LOGIN_PROCESS + || match->ut_type == USER_PROCESS + || match->ut_type == DEAD_PROCESS) + && +#endif +#if _HAVE_UT_ID - 0 + strncmp (entry->ut_id, match->ut_id, sizeof match->ut_id) == 0 +#else + strncmp (entry->ut_line, match->ut_line, sizeof match->ut_line) == 0 +#endif + ); +} + + +/* Get modification time of FILE and put it in TIMER. returns 0 if + successful, -1 if not. */ +static int +get_mtime (const char *file, time_t *timer) +{ + struct stat st; + + if (stat (file, &st) < 0) + return -1; + + *timer = st.st_mtime; + + return 0; +} -- cgit 1.4.1