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Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the + library `Frob' (a library for tweaking knobs) written by James Random Hacker. + + , 1 April 1990 + Ty Coon, President of Vice + +That's all there is to it! + + diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..8d9b7d2 --- /dev/null +++ b/Makefile @@ -0,0 +1,57 @@ +# vim: filetype=make +# Adrian Perez, 2012-08-29 13:09 +# + +-include config.mk +LIBDIR ?= $(PREFIX)/lib + +O := files-pwd.o \ + files-grp.o \ + files-have_o_cloexec.o + +CFLAGS += $(EXTRA_CFLAGS) -pthread -fpic +LDFLAGS += $(CFLAGS) -Wl,-soname,$T -Wl,-as-needed -nostdlib -lpthread +CPPFLAGS += -D_GNU_SOURCE + +ifneq ($(strip $(DATADIR)),) + CPPFLAGS += -DALTFILES_DATADIR='"$(DATADIR)"' +endif +ifneq ($(strip $(MODULE_NAME)),) + CPPFLAGS += -DALTFILES_MODULE_NAME=$(MODULE_NAME) + T := libnss_$(MODULE_NAME).so.2 +else + T := libnss_altfiles.so.2 +endif + +# Support getting the number of parallel jobs via Build-API +# Info: http://people.gnome.org/~walters/docs/build-api.txt +# +ifneq ($(strip $(BUILDAPI_JOBS)),) + MAKEOPTS += -j$(BUILDAPI_JOBS) +endif + +all: $T + +$T: $O + $(CC) -shared -o $@ $^ $(LDFLAGS) + +files-grp.o files-pwd.o: files-XXX.c files-parse.c compat.h + +clean: + $(RM) $O $T + +distclean: clean + $(RM) config.mk + +install: $T + install -m 755 -d $(DESTDIR)$(LIBDIR) + install -m 755 $T $(DESTDIR)$(LIBDIR) + +export VERSION +dist: + @ if test -n "$$VERSION" ; then V=$$VERSION ; \ + else V=$$(git tag | sed -e '/^v[0-9\.]*$$/s/^v//p' -e d | tail -1) ; fi ; \ + echo "nss-altfiles-$$V.tar.xz" ; \ + git archive --prefix=nss-altfiles-$$V/ v$$V | xz -9c > nss-altfiles-$$V.tar.xz + +.PHONY: distclean install dist diff --git a/README.md b/README.md new file mode 100644 index 0000000..3f5933a --- /dev/null +++ b/README.md @@ -0,0 +1,69 @@ +NSS altfiles module +=================== + +This is a NSS module which can read user information from files +in the same format as `/etc/passwd` and `/etc/group` stored in an +alternate location (`/lib` by default). + +Essentially, it is a tweaked copy of the sources for the NSS +`files` module included with [eglibc](http://eglibc.org). It +should work with [glibc2](http://www.gnu.org/software/libc/) +as well. + +Usage +----- + +List the module the `/etc/nsswitch.conf` configuration file. +For example: + + passwd: files altfiles + group: files altfiles + + # Other entries follow... + +This will try to read files from `/etc` first, and under +`/lib` (using the `altfiles` module). Modifications will be +stored in the files under `/etc` (e.g. when using `passwd` +to change an user passwords). + +Building +-------- + +The usual `./configure && make && make install` dance will +work. The `configure` script allows to change the install +path and the path to the alternative data files: + + ./configure --prefix=/installdir/path --datadir=/var + +The example above would build an `altfiles` NSS module that +will read user information from `/var/passwd` and `/var/group`, +which is to be installed under `/installdir/path/lib`. + +To ease the task of packagers, the `DESTDIR` variable can +be passed to `make`: + + make install DESTDIR=/tmp/fakerootdir + +Version scheme +-------------- + +Version numbers follow the numbering of the eglibc releases, +adding a local revision number: `.`. +For example version `2.13.0` would contain the source files +from eglibc 2.13, and the base modifications to make it the +`altfiles` module; version `2.15.3` would contain the source +files from eglibc 2.15, and the base modifications plus three +patches. + +Git tags do also follow this versioning. + +Licensing +--------- + +As eglibc is distributed under the terms of the LGPL 2.1, the +same applies to the extra bits needed to make `nss_altfiles` +work. + +See the COPYING file in the source directory for the full +text of the license. + diff --git a/compat.h b/compat.h new file mode 100644 index 0000000..9157583 --- /dev/null +++ b/compat.h @@ -0,0 +1,35 @@ +/* + * compat.h + * Copyright (C) 2012 Adrian Perez + */ + +#ifndef __compat_h__ +#define __compat_h__ + +#include +#include + +#define __set_errno(errval) \ + (errno = (errval)) + +#define __libc_lock_define_initialized(CLASS, lockvar) \ + CLASS pthread_mutex_t lockvar = PTHREAD_MUTEX_INITIALIZER; + +#define __libc_lock_lock(lock) \ + pthread_mutex_lock (&(lock)) + +#define __libc_lock_unlock(lock) \ + pthread_mutex_unlock (&(lock)) + +extern int __have_o_cloexec; + +#ifndef ALTFILES_DATADIR +#define ALTFILES_DATADIR "/lib" +#endif /* !ALTFILES_DATADIR */ + +#ifndef ALTFILES_MODULE_NAME +#define ALTFILES_MODULE_NAME altfiles +#endif /* !ALTFILES_MODULE_NAME */ + +#endif /* !__compat_h__ */ + diff --git a/configure b/configure new file mode 100755 index 0000000..3336c3d --- /dev/null +++ b/configure @@ -0,0 +1,72 @@ +#! /bin/sh + +### See http://people.gnome.org/~walters/docs/build-api.txt +# buildapi-variable-no-builddir + +# Show help if requested. +# +for var in "$@" ; do + if test "${var}" = "--help" ; then + cat <<-EOF + usage: $0 [--options] + Available options: + + --help This help message. + --prefix=PATH Installation path prefix [default: /] + --datadir=PATH Path for runtime data files [default: prefix/lib/] + --with-module-name=NAME + Specify an alternate name for the module [default: altfiles] + + Also, the following relevant environment variables can be set: + + CFLAGS Additional command line flags to be pased to the C compiler + CXXFLAGS Additional command line flags to be pased to the C++ compiler + + NOTE: This script tries to mimic the typical usage forconfigure scripts + generated by autotools, hence it will silently ignore unrecognized + command line options. + EOF + exit + fi +done + +# Inherit the CFLAGS/CXXFLAGS from the environment, if defined. +# +test -n "${CXXFLAGS}" && EXTRA_CXXFLAGS=${CXXFLAGS} +test -n "${CFLAGS}" && EXTRA_CFLAGS=${CFLAGS} + +# Inspect arguments and generate config.mk +# +echo "# autogenerated by: $0 $*" > config.mk +for var in "$@" ; do + case ${var} in + CFLAGS=* | CXXFLAGS=*) + echo "Setting EXTRA_${var}" + echo "EXTRA_${var}" >> config.mk + ;; + --prefix=*) + var=`echo "${var}" | sed 's/^--prefix=//'` + echo "Setting PREFIX=${var}" + echo "PREFIX := ${var}" >> config.mk + ;; + --libdir=*) + var=`echo "${var}" | sed 's/^--libdir=//'` + echo "Setting LIBDIR=${var}" + echo "LIBDIR := ${var}" >> config.mk + ;; + --datadir=*) + var=`echo "${var}" | sed 's/^--datadir=//'` + echo "Setting DATADIR=${var}" + echo "DATADIR := ${var}" >> config.mk + ;; + --with-module-name=*) + var=`echo "${var}" | sed 's/^--with-module-name=//'` + echo "Setting MODULE_NAME=${var}" + echo "MODULE_NAME := ${var}" >> config.mk + ;; + *) + true + ;; + esac +done +echo "config.mk written" diff --git a/dlfiles b/dlfiles new file mode 100755 index 0000000..f6b5d08 --- /dev/null +++ b/dlfiles @@ -0,0 +1,28 @@ +#! /bin/bash +# +# dlfiles +# Copyright (C) 2013 Adrian Perez +# +# Distributed under terms of the MIT license. +# +branch=${1/\./_} +revision=$2 +files=( + files-XXX.c + files-grp.c + files-have_o_cloexec.c + files-parse.c + files-pwd.c +) + +if [[ $# -ne 2 ]] ; then + cat <<-EOF + Usage: $0 branch revision + EOF + exit 1 +fi 1>&2 + +for i in ${files[@]} ; do + wget -O "$i" \ + "http://www.eglibc.org/cgi-bin/viewvc.cgi/branches/eglibc-${branch}/libc/nss/nss_files/${i}?revision=${revision}" +done diff --git a/files-XXX.c b/files-XXX.c new file mode 100644 index 0000000..7e05060 --- /dev/null +++ b/files-XXX.c @@ -0,0 +1,343 @@ +/* Common code for file-based databases in nss_files module. + Copyright (C) 1996-2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include +#include +#include +#include "compat.h" + +/* These symbols are defined by the including source file: + + ENTNAME -- database name of the structure and functions (hostent, pwent). + STRUCTURE -- struct name, define only if not ENTNAME (passwd, group). + DATABASE -- string of the database file's name ("hosts", "passwd"). + + NEED_H_ERRNO - defined iff an arg `int *herrnop' is used. + + Also see files-parse.c. +*/ + +#define ENTNAME_r CONCAT(ENTNAME,_r) + +#define DATAFILE ALTFILES_DATADIR "/" DATABASE + +#ifdef NEED_H_ERRNO +# include +# define H_ERRNO_PROTO , int *herrnop +# define H_ERRNO_ARG , herrnop +# define H_ERRNO_SET(val) (*herrnop = (val)) +#else +# define H_ERRNO_PROTO +# define H_ERRNO_ARG +# define H_ERRNO_SET(val) ((void) 0) +#endif + +#ifndef EXTRA_ARGS +# define EXTRA_ARGS +# define EXTRA_ARGS_DECL +# define EXTRA_ARGS_VALUE +#endif + +/* Locks the static variables in this file. */ +__libc_lock_define_initialized (static, lock) + +/* Maintenance of the shared stream open on the database file. */ + +static FILE *stream; +static fpos_t position; +static enum { nouse, getent, getby } last_use; +static int keep_stream; + +/* Open database file if not already opened. */ +static enum nss_status +internal_setent (int stayopen) +{ + enum nss_status status = NSS_STATUS_SUCCESS; + + if (stream == NULL) + { + stream = fopen (DATAFILE, "rce"); + + if (stream == NULL) + status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL; + else + { +#if !defined O_CLOEXEC || !defined __ASSUME_O_CLOEXEC +# ifdef O_CLOEXEC + if (__have_o_cloexec <= 0) +# endif + { + /* We have to make sure the file is `closed on exec'. */ + int result; + int flags; + + result = flags = fcntl (fileno (stream), F_GETFD, 0); + if (result >= 0) + { +# ifdef O_CLOEXEC + if (__have_o_cloexec == 0) + __have_o_cloexec = (flags & FD_CLOEXEC) == 0 ? -1 : 1; + if (__have_o_cloexec < 0) +# endif + { + flags |= FD_CLOEXEC; + result = fcntl (fileno (stream), F_SETFD, flags); + } + } + if (result < 0) + { + /* Something went wrong. Close the stream and return a + failure. */ + fclose (stream); + stream = NULL; + status = NSS_STATUS_UNAVAIL; + } + } +#endif + } + } + else + rewind (stream); + + /* Remember STAYOPEN flag. */ + if (stream != NULL) + keep_stream |= stayopen; + + return status; +} + + +/* Thread-safe, exported version of that. */ +enum nss_status +CONCAT(CONCAT(CONCAT(_nss_, ALTFILES_MODULE_NAME), _set), ENTNAME) (int stayopen) +{ + enum nss_status status; + + __libc_lock_lock (lock); + + status = internal_setent (stayopen); + + if (status == NSS_STATUS_SUCCESS && fgetpos (stream, &position) < 0) + { + fclose (stream); + stream = NULL; + status = NSS_STATUS_UNAVAIL; + } + + last_use = getent; + + __libc_lock_unlock (lock); + + return status; +} + + +/* Close the database file. */ +static void +internal_endent (void) +{ + if (stream != NULL) + { + fclose (stream); + stream = NULL; + } +} + + +/* Thread-safe, exported version of that. */ +enum nss_status +CONCAT(CONCAT(CONCAT(_nss_, ALTFILES_MODULE_NAME), _end), ENTNAME) (void) +{ + __libc_lock_lock (lock); + + internal_endent (); + + /* Reset STAYOPEN flag. */ + keep_stream = 0; + + __libc_lock_unlock (lock); + + return NSS_STATUS_SUCCESS; +} + +/* Parsing the database file into `struct STRUCTURE' data structures. */ + +static enum nss_status +internal_getent (struct STRUCTURE *result, + char *buffer, size_t buflen, int *errnop H_ERRNO_PROTO + EXTRA_ARGS_DECL) +{ + char *p; + struct parser_data *data = (void *) buffer; + int linebuflen = buffer + buflen - data->linebuffer; + int parse_result; + + if (buflen < sizeof *data + 2) + { + *errnop = ERANGE; + H_ERRNO_SET (NETDB_INTERNAL); + return NSS_STATUS_TRYAGAIN; + } + + do + { + /* Terminate the line so that we can test for overflow. */ + ((unsigned char *) data->linebuffer)[linebuflen - 1] = '\xff'; + + p = fgets_unlocked (data->linebuffer, linebuflen, stream); + if (p == NULL) + { + /* End of file or read error. */ + H_ERRNO_SET (HOST_NOT_FOUND); + return NSS_STATUS_NOTFOUND; + } + else if (((unsigned char *) data->linebuffer)[linebuflen - 1] != 0xff) + { + /* The line is too long. Give the user the opportunity to + enlarge the buffer. */ + *errnop = ERANGE; + H_ERRNO_SET (NETDB_INTERNAL); + return NSS_STATUS_TRYAGAIN; + } + + /* Skip leading blanks. */ + while (isspace (*p)) + ++p; + } + while (*p == '\0' || *p == '#' /* Ignore empty and comment lines. */ + /* Parse the line. If it is invalid, loop to get the next + line of the file to parse. */ + || ! (parse_result = parse_line (p, result, data, buflen, errnop + EXTRA_ARGS))); + + if (__builtin_expect (parse_result == -1, 0)) + { + H_ERRNO_SET (NETDB_INTERNAL); + return NSS_STATUS_TRYAGAIN; + } + + /* Filled in RESULT with the next entry from the database file. */ + return NSS_STATUS_SUCCESS; +} + + +/* Return the next entry from the database file, doing locking. */ +enum nss_status +CONCAT(CONCAT(CONCAT(_nss_, ALTFILES_MODULE_NAME), _get), ENTNAME_r) (struct STRUCTURE *result, char *buffer, + size_t buflen, int *errnop H_ERRNO_PROTO) +{ + /* Return next entry in host file. */ + enum nss_status status = NSS_STATUS_SUCCESS; + + __libc_lock_lock (lock); + + /* Be prepared that the set*ent function was not called before. */ + if (stream == NULL) + { + int save_errno = errno; + + status = internal_setent (0); + + __set_errno (save_errno); + + if (status == NSS_STATUS_SUCCESS && fgetpos (stream, &position) < 0) + { + fclose (stream); + stream = NULL; + status = NSS_STATUS_UNAVAIL; + } + } + + if (status == NSS_STATUS_SUCCESS) + { + /* If the last use was not by the getent function we need the + position the stream. */ + if (last_use != getent) + { + if (fsetpos (stream, &position) < 0) + status = NSS_STATUS_UNAVAIL; + else + last_use = getent; + } + + if (status == NSS_STATUS_SUCCESS) + { + status = internal_getent (result, buffer, buflen, errnop + H_ERRNO_ARG EXTRA_ARGS_VALUE); + + /* Remember this position if we were successful. If the + operation failed we give the user a chance to repeat the + operation (perhaps the buffer was too small). */ + if (status == NSS_STATUS_SUCCESS) + fgetpos (stream, &position); + else + /* We must make sure we reposition the stream the next call. */ + last_use = nouse; + } + } + + __libc_lock_unlock (lock); + + return status; +} + +/* Macro for defining lookup functions for this file-based database. + + NAME is the name of the lookup; e.g. `hostbyname'. + + DB_CHAR, KEYPATTERN, KEYSIZE are ignored here but used by db-XXX.c + e.g. `1 + sizeof (id) * 4'. + + PROTO is the potentially empty list of other parameters. + + BREAK_IF_MATCH is a block of code which compares `struct STRUCTURE *result' + to the lookup key arguments and does `break;' if they match. */ + +#define DB_LOOKUP(name, db_char, keysize, keypattern, break_if_match, proto...)\ +enum nss_status \ +CONCAT(CONCAT(_nss_, ALTFILES_MODULE_NAME), _get ## name ## _r) (proto, \ + struct STRUCTURE *result, char *buffer, \ + size_t buflen, int *errnop H_ERRNO_PROTO) \ +{ \ + enum nss_status status; \ + \ + __libc_lock_lock (lock); \ + \ + /* Reset file pointer to beginning or open file. */ \ + status = internal_setent (keep_stream); \ + \ + if (status == NSS_STATUS_SUCCESS) \ + { \ + /* Tell getent function that we have repositioned the file pointer. */ \ + last_use = getby; \ + \ + while ((status = internal_getent (result, buffer, buflen, errnop \ + H_ERRNO_ARG EXTRA_ARGS_VALUE)) \ + == NSS_STATUS_SUCCESS) \ + { break_if_match } \ + \ + if (! keep_stream) \ + internal_endent (); \ + } \ + \ + __libc_lock_unlock (lock); \ + \ + return status; \ +} diff --git a/files-grp.c b/files-grp.c new file mode 100644 index 0000000..2b81871 --- /dev/null +++ b/files-grp.c @@ -0,0 +1,44 @@ +/* Group file parser in nss_files module. + Copyright (C) 1996-2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include + +#define STRUCTURE group +#define ENTNAME grent +#define DATABASE "group" +struct grent_data {}; + +/* Our parser function is already defined in fgetgrent.c, so use that. + to parse lines from the database file. */ +#define EXTERN_PARSER +#include "files-parse.c" +#include GENERIC + +DB_LOOKUP (grnam, '.', 0, ("%s", name), + { + if (name[0] != '-' && name[0] != '+' + && ! strcmp (name, result->gr_name)) + break; + }, const char *name) + +DB_LOOKUP (grgid, '=', 20, ("%lu", (unsigned long int) gid), + { + if (result->gr_gid == gid && result->gr_name[0] != '+' + && result->gr_name[0] != '-') + break; + }, gid_t gid) diff --git a/files-have_o_cloexec.c b/files-have_o_cloexec.c new file mode 100644 index 0000000..079b1e1 --- /dev/null +++ b/files-have_o_cloexec.c @@ -0,0 +1,22 @@ +/* Copyright (C) 2007-2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include + +#if defined O_CLOEXEC && !defined __ASSUME_O_CLOEXEC +int __have_o_cloexec; +#endif diff --git a/files-parse.c b/files-parse.c new file mode 100644 index 0000000..91f32da --- /dev/null +++ b/files-parse.c @@ -0,0 +1,335 @@ +/* Common code for file-based database parsers in nss_files module. + Copyright (C) 1996-2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include +#include +#include +#include + +/* These symbols are defined by the including source file: + + ENTNAME -- database name of the structure and functions (hostent, pwent). + STRUCTURE -- struct name, define only if not ENTNAME (passwd, group). + DATABASE -- string of the database file's name ("hosts", "passwd"). + + ENTDATA -- if defined, `struct ENTDATA' is used by the parser to store + things pointed to by the resultant `struct STRUCTURE'. + + NEED_H_ERRNO - defined iff an arg `int *herrnop' is used. + + EXTRA_ARGS -- defined iff extra parameters must be passed to the parser + EXTRA_ARGS_DECL -- declaration for these extra parameters + EXTRA_ARGS_VALUE -- values to be passed for these parameters + + Also see files-XXX.c. */ + +#ifndef EXTRA_ARGS +# define EXTRA_ARGS +# define EXTRA_ARGS_DECL +# define EXTRA_ARGS_VALUE +#endif + +#define CONCAT(a,b) CONCAT1(a,b) +#define CONCAT1(a,b) a##b + +#ifndef STRUCTURE +# define STRUCTURE ENTNAME +#endif + + +struct parser_data + { +#ifdef ENTDATA + struct ENTDATA entdata; +# define ENTDATA_DECL(data) struct ENTDATA *const entdata = &data->entdata; +#else +# define ENTDATA_DECL(data) +#endif + char linebuffer[0]; + }; + +#ifdef ENTDATA +/* The function can't be exported, because the entdata structure + is defined only in files-foo.c. */ +# define parser_stclass static +# define nss_files_parse_hidden_def(name) +#else +/* Export the line parser function so it can be used in nss_db. */ +# define parser_stclass /* Global */ +# define parse_line CONCAT(_nss_files_parse_,ENTNAME) +# ifdef IS_IN_libc +/* We are defining one of the functions that actually lives in libc + because it is used to implement fget*ent and suchlike. */ +# define nss_files_parse_hidden_def(name) libc_hidden_def (name) +# else +# define nss_files_parse_hidden_def(name) libnss_files_hidden_def (name) +# endif +#endif + + +#ifdef EXTERN_PARSER + +/* The parser is defined in a different module. */ +extern int parse_line (char *line, struct STRUCTURE *result, + struct parser_data *data, size_t datalen, int *errnop + EXTRA_ARGS_DECL); + +# define LINE_PARSER(EOLSET, BODY) /* Do nothing */ + +#else + +/* Define a line parsing function. */ + +# define LINE_PARSER(EOLSET, BODY) \ +parser_stclass int \ +parse_line (char *line, struct STRUCTURE *result, \ + struct parser_data *data, size_t datalen, int *errnop \ + EXTRA_ARGS_DECL) \ +{ \ + ENTDATA_DECL (data) \ + BUFFER_PREPARE \ + char *p = strpbrk (line, EOLSET "\n"); \ + if (p != NULL) \ + *p = '\0'; \ + BODY; \ + TRAILING_LIST_PARSER; \ + return 1; \ +} \ +nss_files_parse_hidden_def (parse_line) + + +# define STRING_FIELD(variable, terminator_p, swallow) \ + { \ + variable = line; \ + while (*line != '\0' && !terminator_p (*line)) \ + ++line; \ + if (*line != '\0') \ + { \ + *line = '\0'; \ + do \ + ++line; \ + while (swallow && terminator_p (*line)); \ + } \ + } + +# define STRING_LIST(variable, terminator_c) \ + { \ + char **list = parse_list (&line, buf_start, buf_end, terminator_c, \ + errnop); \ + if (list) \ + variable = list; \ + else \ + return -1; /* -1 indicates we ran out of space. */ \ + \ + /* Determine the new end of the buffer. */ \ + while (*list != NULL) \ + ++list; \ + buf_start = (char *) (list + 1); \ + } + +/* Helper function. */ +static inline uint32_t +__attribute__ ((always_inline)) +strtou32 (const char *nptr, char **endptr, int base) +{ + unsigned long int val = strtoul (nptr, endptr, base); + + /* Match the 32-bit behavior on 64-bit platforms. */ + if (sizeof (long int) > 4 && val > 0xffffffff) + val = 0xffffffff; + + return val; +} + +# define INT_FIELD(variable, terminator_p, swallow, base, convert) \ + { \ + char *endp; \ + variable = convert (strtou32 (line, &endp, base)); \ + if (endp == line) \ + return 0; \ + else if (terminator_p (*endp)) \ + do \ + ++endp; \ + while (swallow && terminator_p (*endp)); \ + else if (*endp != '\0') \ + return 0; \ + line = endp; \ + } + +# define INT_FIELD_MAYBE_NULL(variable, terminator_p, swallow, base, convert, default) \ + { \ + char *endp; \ + if (*line == '\0') \ + /* We expect some more input, so don't allow the string to end here. */ \ + return 0; \ + variable = convert (strtou32 (line, &endp, base)); \ + if (endp == line) \ + variable = default; \ + if (terminator_p (*endp)) \ + do \ + ++endp; \ + while (swallow && terminator_p (*endp)); \ + else if (*endp != '\0') \ + return 0; \ + line = endp; \ + } + +# define ISCOLON(c) ((c) == ':') + + +# ifndef TRAILING_LIST_MEMBER +# define BUFFER_PREPARE /* Nothing to do. */ +# define TRAILING_LIST_PARSER /* Nothing to do. */ +# else + +# define BUFFER_PREPARE \ + char *buf_start = NULL; \ + char *buf_end = (char *) data + datalen; \ + if (line >= data->linebuffer && line < buf_end) \ + /* Find the end of the line buffer, we will use the space in \ + DATA after it for storing the vector of pointers. */ \ + buf_start = strchr (line, '\0') + 1; \ + else \ + /* LINE does not point within DATA->linebuffer, so that space is \ + not being used for scratch space right now. We can use all of \ + it for the pointer vector storage. */ \ + buf_start = data->linebuffer; \ + +# define TRAILING_LIST_PARSER \ +{ \ + if (buf_start == NULL) \ + { \ + if (line >= data->linebuffer && line < buf_end) \ + /* Find the end of the line buffer, we will use the space in \ + DATA after it for storing the vector of pointers. */ \ + buf_start = strchr (line, '\0') + 1; \ + else \ + /* LINE does not point within DATA->linebuffer, so that space is \ + not being used for scratch space right now. We can use all of \ + it for the pointer vector storage. */ \ + buf_start = data->linebuffer; \ + } \ + \ + char **list = parse_list (&line, buf_start, buf_end, '\0', errnop); \ + if (list) \ + result->TRAILING_LIST_MEMBER = list; \ + else \ + return -1; /* -1 indicates we ran out of space. */ \ +} + +static inline char ** +__attribute ((always_inline)) +parse_list (char **linep, char *eol, char *buf_end, int terminator_c, + int *errnop) +{ + char *line = *linep; + char **list, **p; + + /* Adjust the pointer so it is aligned for storing pointers. */ + eol += __alignof__ (char *) - 1; + eol -= (eol - (char *) 0) % __alignof__ (char *); + /* We will start the storage here for the vector of pointers. */ + list = (char **) eol; + + p = list; + while (1) + { + if ((char *) (p + 2) > buf_end) + { + /* We cannot fit another pointer in the buffer. */ + *errnop = ERANGE; + return NULL; + } + + if (*line == '\0') + break; + if (*line == terminator_c) + { + ++line; + break; + } + + /* Skip leading white space. This might not be portable but useful. */ + while (isspace (*line)) + ++line; + + char *elt = line; + while (1) + { + if (*line == '\0' || *line == terminator_c + || TRAILING_LIST_SEPARATOR_P (*line)) + { + /* End of the next entry. */ + if (line > elt) + /* We really found some data. */ + *p++ = elt; + + /* Terminate string if necessary. */ + if (*line != '\0') + { + char endc = *line; + *line++ = '\0'; + if (endc == terminator_c) + goto out; + } + break; + } + ++line; + } + } + out: + *p = NULL; + *linep = line; + + return list; +} + +# endif /* TRAILING_LIST_MEMBER */ +#endif /* EXTERN_PARSER */ + + +#define LOOKUP_NAME(nameelt, aliaselt) \ +{ \ + char **ap; \ + if (! strcmp (name, result->nameelt)) \ + break; \ + for (ap = result->aliaselt; *ap; ++ap) \ + if (! strcmp (name, *ap)) \ + break; \ + if (*ap) \ + break; \ +} + +#define LOOKUP_NAME_CASE(nameelt, aliaselt) \ +{ \ + char **ap; \ + if (! __strcasecmp (name, result->nameelt)) \ + break; \ + for (ap = result->aliaselt; *ap; ++ap) \ + if (! __strcasecmp (name, *ap)) \ + break; \ + if (*ap) \ + break; \ +} + + +/* This is defined by db-*.c to include "../nss_db/db-XXX.c" instead. */ +#ifndef GENERIC +# define GENERIC "files-XXX.c" +#endif diff --git a/files-pwd.c b/files-pwd.c new file mode 100644 index 0000000..3b31817 --- /dev/null +++ b/files-pwd.c @@ -0,0 +1,44 @@ +/* User file parser in nss_files module. + Copyright (C) 1996-2013 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include + +#define STRUCTURE passwd +#define ENTNAME pwent +#define DATABASE "passwd" +struct pwent_data {}; + +/* Our parser function is already defined in fgetpwent_r.c, so use that + to parse lines from the database file. */ +#define EXTERN_PARSER +#include "files-parse.c" +#include GENERIC + +DB_LOOKUP (pwnam, '.', 0, ("%s", name), + { + if (name[0] != '+' && name[0] != '-' + && ! strcmp (name, result->pw_name)) + break; + }, const char *name) + +DB_LOOKUP (pwuid, '=', 20, ("%lu", (unsigned long int) uid), + { + if (result->pw_uid == uid && result->pw_name[0] != '+' + && result->pw_name[0] != '-') + break; + }, uid_t uid)