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667 lines
22 KiB
C
667 lines
22 KiB
C
/* This modules is based on the params.c module from Samba, written by Karl Auer
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and much modifed by Christopher Hertel. */
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, visit the http://fsf.org website.
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*/
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/* -------------------------------------------------------------------------- **
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*
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* Module name: params
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*
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* -------------------------------------------------------------------------- **
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*
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* This module performs lexical analysis and initial parsing of a
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* Windows-like parameter file. It recognizes and handles four token
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* types: section-name, parameter-name, parameter-value, and
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* end-of-file. Comments and line continuation are handled
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* internally.
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*
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* The entry point to the module is function pm_process(). This
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* function opens the source file, calls the Parse() function to parse
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* the input, and then closes the file when either the EOF is reached
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* or a fatal error is encountered.
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*
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* A sample parameter file might look like this:
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*
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* [section one]
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* parameter one = value string
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* parameter two = another value
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* [section two]
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* new parameter = some value or t'other
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*
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* The parameter file is divided into sections by section headers:
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* section names enclosed in square brackets (eg. [section one]).
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* Each section contains parameter lines, each of which consist of a
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* parameter name and value delimited by an equal sign. Roughly, the
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* syntax is:
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*
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* <file> :== { <section> } EOF
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*
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* <section> :== <section header> { <parameter line> }
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*
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* <section header> :== '[' NAME ']'
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*
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* <parameter line> :== NAME '=' VALUE '\n'
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*
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* Blank lines and comment lines are ignored. Comment lines are lines
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* beginning with either a semicolon (';') or a pound sign ('#').
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*
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* All whitespace in section names and parameter names is compressed
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* to single spaces. Leading and trailing whitespace is stipped from
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* both names and values.
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*
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* Only the first equals sign in a parameter line is significant.
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* Parameter values may contain equals signs, square brackets and
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* semicolons. Internal whitespace is retained in parameter values,
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* with the exception of the '\r' character, which is stripped for
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* historic reasons. Parameter names may not start with a left square
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* bracket, an equal sign, a pound sign, or a semicolon, because these
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* are used to identify other tokens.
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*
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* -------------------------------------------------------------------------- **
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*/
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#include "rsync.h"
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#include "ifuncs.h"
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#include "itypes.h"
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/* -------------------------------------------------------------------------- **
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* Constants...
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*/
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#define BUFR_INC 1024
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/* -------------------------------------------------------------------------- **
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* Variables...
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*
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* bufr - pointer to a global buffer. This is probably a kludge,
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* but it was the nicest kludge I could think of (for now).
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* bSize - The size of the global buffer <bufr>.
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*/
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static char *bufr = NULL;
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static int bSize = 0;
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static BOOL (*the_sfunc)(char *);
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static BOOL (*the_pfunc)(char *, char *);
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/* -------------------------------------------------------------------------- **
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* Functions...
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*/
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static int EatWhitespace( FILE *InFile )
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/* ------------------------------------------------------------------------ **
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* Scan past whitespace (see ctype(3C)) and return the first non-whitespace
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* character, or newline, or EOF.
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*
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* Input: InFile - Input source.
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*
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* Output: The next non-whitespace character in the input stream.
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*
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* Notes: Because the config files use a line-oriented grammar, we
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* explicitly exclude the newline character from the list of
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* whitespace characters.
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* - Note that both EOF (-1) and the nul character ('\0') are
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* considered end-of-file markers.
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*
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* ------------------------------------------------------------------------ **
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*/
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{
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int c;
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for( c = getc( InFile ); isspace( c ) && ('\n' != c); c = getc( InFile ) )
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;
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return( c );
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} /* EatWhitespace */
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static int EatComment( FILE *InFile )
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/* ------------------------------------------------------------------------ **
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* Scan to the end of a comment.
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*
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* Input: InFile - Input source.
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*
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* Output: The character that marks the end of the comment. Normally,
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* this will be a newline, but it *might* be an EOF.
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*
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* Notes: Because the config files use a line-oriented grammar, we
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* explicitly exclude the newline character from the list of
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* whitespace characters.
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* - Note that both EOF (-1) and the nul character ('\0') are
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* considered end-of-file markers.
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*
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* ------------------------------------------------------------------------ **
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*/
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{
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int c;
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for( c = getc( InFile ); ('\n'!=c) && (EOF!=c) && (c>0); c = getc( InFile ) )
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;
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return( c );
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} /* EatComment */
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static int Continuation( char *line, int pos )
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/* ------------------------------------------------------------------------ **
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* Scan backards within a string to discover if the last non-whitespace
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* character is a line-continuation character ('\\').
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*
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* Input: line - A pointer to a buffer containing the string to be
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* scanned.
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* pos - This is taken to be the offset of the end of the
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* string. This position is *not* scanned.
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*
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* Output: The offset of the '\\' character if it was found, or -1 to
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* indicate that it was not.
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*
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* ------------------------------------------------------------------------ **
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*/
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{
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pos--;
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while( pos >= 0 && isSpace(line + pos) )
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pos--;
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return( ((pos >= 0) && ('\\' == line[pos])) ? pos : -1 );
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} /* Continuation */
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static BOOL Section( FILE *InFile, BOOL (*sfunc)(char *) )
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/* ------------------------------------------------------------------------ **
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* Scan a section name, and pass the name to function sfunc().
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*
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* Input: InFile - Input source.
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* sfunc - Pointer to the function to be called if the section
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* name is successfully read.
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*
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* Output: True if the section name was read and True was returned from
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* <sfunc>. False if <sfunc> failed or if a lexical error was
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* encountered.
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*
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* ------------------------------------------------------------------------ **
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*/
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{
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int c;
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int i;
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int end;
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char *func = "params.c:Section() -";
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i = 0; /* <i> is the offset of the next free byte in bufr[] and */
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end = 0; /* <end> is the current "end of string" offset. In most */
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/* cases these will be the same, but if the last */
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/* character written to bufr[] is a space, then <end> */
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/* will be one less than <i>. */
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c = EatWhitespace( InFile ); /* We've already got the '['. Scan */
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/* past initial white space. */
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while( (EOF != c) && (c > 0) )
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{
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/* Check that the buffer is big enough for the next character. */
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if( i > (bSize - 2) )
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{
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bSize += BUFR_INC;
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bufr = realloc_array( bufr, char, bSize );
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if( NULL == bufr )
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{
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rprintf(FLOG, "%s Memory re-allocation failure.", func);
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return( False );
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}
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}
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/* Handle a single character. */
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switch( c )
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{
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case ']': /* Found the closing bracket. */
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bufr[end] = '\0';
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if( 0 == end ) /* Don't allow an empty name. */
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{
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rprintf(FLOG, "%s Empty section name in config file.\n", func );
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return( False );
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}
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if( !sfunc( bufr ) ) /* Got a valid name. Deal with it. */
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return( False );
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(void)EatComment( InFile ); /* Finish off the line. */
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return( True );
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case '\n': /* Got newline before closing ']'. */
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i = Continuation( bufr, i ); /* Check for line continuation. */
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if( i < 0 )
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{
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bufr[end] = '\0';
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rprintf(FLOG, "%s Badly formed line in config file: %s\n",
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func, bufr );
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return( False );
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}
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end = ( (i > 0) && (' ' == bufr[i - 1]) ) ? (i - 1) : (i);
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c = getc( InFile ); /* Continue with next line. */
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break;
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default: /* All else are a valid name chars. */
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if( isspace( c ) ) /* One space per whitespace region. */
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{
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bufr[end] = ' ';
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i = end + 1;
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c = EatWhitespace( InFile );
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}
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else /* All others copy verbatim. */
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{
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bufr[i++] = c;
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end = i;
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c = getc( InFile );
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}
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}
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}
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/* We arrive here if we've met the EOF before the closing bracket. */
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rprintf(FLOG, "%s Unexpected EOF in the config file: %s\n", func, bufr );
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return( False );
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} /* Section */
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static BOOL Parameter( FILE *InFile, BOOL (*pfunc)(char *, char *), int c )
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/* ------------------------------------------------------------------------ **
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* Scan a parameter name and value, and pass these two fields to pfunc().
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*
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* Input: InFile - The input source.
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* pfunc - A pointer to the function that will be called to
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* process the parameter, once it has been scanned.
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* c - The first character of the parameter name, which
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* would have been read by Parse(). Unlike a comment
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* line or a section header, there is no lead-in
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* character that can be discarded.
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*
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* Output: True if the parameter name and value were scanned and processed
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* successfully, else False.
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*
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* Notes: This function is in two parts. The first loop scans the
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* parameter name. Internal whitespace is compressed, and an
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* equal sign (=) terminates the token. Leading and trailing
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* whitespace is discarded. The second loop scans the parameter
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* value. When both have been successfully identified, they are
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* passed to pfunc() for processing.
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*
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* ------------------------------------------------------------------------ **
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*/
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{
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int i = 0; /* Position within bufr. */
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int end = 0; /* bufr[end] is current end-of-string. */
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int vstart = 0; /* Starting position of the parameter value. */
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char *func = "params.c:Parameter() -";
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/* Read the parameter name. */
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while( 0 == vstart ) /* Loop until we've found the start of the value. */
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{
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if( i > (bSize - 2) ) /* Ensure there's space for next char. */
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{
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bSize += BUFR_INC;
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bufr = realloc_array( bufr, char, bSize );
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if( NULL == bufr )
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{
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rprintf(FLOG, "%s Memory re-allocation failure.", func) ;
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return( False );
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}
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}
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switch( c )
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{
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case '=': /* Equal sign marks end of param name. */
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if( 0 == end ) /* Don't allow an empty name. */
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{
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rprintf(FLOG, "%s Invalid parameter name in config file.\n", func );
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return( False );
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}
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bufr[end++] = '\0'; /* Mark end of string & advance. */
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i = vstart = end; /* New string starts here. */
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c = EatWhitespace(InFile);
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break;
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case '\n': /* Find continuation char, else error. */
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i = Continuation( bufr, i );
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if( i < 0 )
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{
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bufr[end] = '\0';
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rprintf(FLOG, "%s Ignoring badly formed line in config file: %s\n",
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func, bufr );
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return( True );
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}
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end = ( (i > 0) && (' ' == bufr[i - 1]) ) ? (i - 1) : (i);
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c = getc( InFile ); /* Read past eoln. */
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break;
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case '\0': /* Shouldn't have EOF within param name. */
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case EOF:
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bufr[i] = '\0';
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rprintf(FLOG, "%s Unexpected end-of-file at: %s\n", func, bufr );
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return( True );
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case ' ':
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case '\t':
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/* A directive divides at the first space or tab. */
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if (*bufr == '&') {
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bufr[end++] = '\0';
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i = vstart = end;
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c = EatWhitespace(InFile);
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if (c == '=')
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c = EatWhitespace(InFile);
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break;
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}
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/* FALL THROUGH */
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default:
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if( isspace( c ) ) /* One ' ' per whitespace region. */
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{
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bufr[end] = ' ';
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i = end + 1;
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c = EatWhitespace( InFile );
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}
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else /* All others verbatim. */
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{
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bufr[i++] = c;
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end = i;
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c = getc( InFile );
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}
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}
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}
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/* Now parse the value. */
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while( (EOF !=c) && (c > 0) )
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{
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if( i > (bSize - 2) ) /* Make sure there's enough room. */
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{
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bSize += BUFR_INC;
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bufr = realloc_array( bufr, char, bSize );
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if( NULL == bufr )
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{
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rprintf(FLOG, "%s Memory re-allocation failure.", func) ;
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return( False );
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}
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}
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switch( c )
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{
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case '\r': /* Explicitly remove '\r' because the older */
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c = getc( InFile ); /* version called fgets_slash() which also */
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break; /* removes them. */
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case '\n': /* Marks end of value unless there's a '\'. */
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i = Continuation( bufr, i );
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if( i < 0 )
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c = 0;
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else
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{
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for( end = i; end >= 0 && isSpace(bufr + end); end-- )
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;
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c = getc( InFile );
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}
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break;
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default: /* All others verbatim. Note that spaces do */
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bufr[i++] = c; /* not advance <end>. This allows trimming */
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if( !isspace( c ) ) /* of whitespace at the end of the line. */
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end = i;
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c = getc( InFile );
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break;
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}
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}
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bufr[end] = '\0'; /* End of value. */
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return( pfunc( bufr, &bufr[vstart] ) ); /* Pass name & value to pfunc(). */
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} /* Parameter */
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static int name_cmp(const void *n1, const void *n2)
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{
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return strcmp(*(char * const *)n1, *(char * const *)n2);
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}
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static int include_config(char *include, int manage_globals)
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{
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STRUCT_STAT sb;
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char *match = manage_globals ? "*.conf" : "*.inc";
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int ret;
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if (do_stat(include, &sb) < 0) {
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rsyserr(FLOG, errno, "unable to stat config file \"%s\"", include);
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return 0;
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}
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if (S_ISREG(sb.st_mode)) {
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if (manage_globals && the_sfunc)
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the_sfunc("]push");
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ret = pm_process(include, the_sfunc, the_pfunc);
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if (manage_globals && the_sfunc)
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the_sfunc("]pop");
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} else if (S_ISDIR(sb.st_mode)) {
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char buf[MAXPATHLEN], **bpp;
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item_list conf_list;
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struct dirent *di;
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size_t j;
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DIR *d;
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if (!(d = opendir(include))) {
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rsyserr(FLOG, errno, "unable to open config dir \"%s\"", include);
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return 0;
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}
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memset(&conf_list, 0, sizeof conf_list);
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while ((di = readdir(d)) != NULL) {
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char *dname = d_name(di);
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if (!wildmatch(match, dname))
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continue;
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bpp = EXPAND_ITEM_LIST(&conf_list, char *, 32);
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pathjoin(buf, sizeof buf, include, dname);
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*bpp = strdup(buf);
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}
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closedir(d);
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if (!(bpp = conf_list.items))
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return 1;
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if (conf_list.count > 1)
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qsort(bpp, conf_list.count, sizeof (char *), name_cmp);
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for (j = 0, ret = 1; j < conf_list.count; j++) {
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if (manage_globals && the_sfunc)
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the_sfunc(j == 0 ? "]push" : "]reset");
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if ((ret = pm_process(bpp[j], the_sfunc, the_pfunc)) != 1)
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break;
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}
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if (manage_globals && the_sfunc)
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the_sfunc("]pop");
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for (j = 0; j < conf_list.count; j++)
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free(bpp[j]);
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free(bpp);
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} else
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ret = 0;
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return ret;
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}
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static int parse_directives(char *name, char *val)
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{
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if (strcasecmp(name, "&include") == 0)
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return include_config(val, 1);
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if (strcasecmp(name, "&merge") == 0)
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return include_config(val, 0);
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rprintf(FLOG, "Unknown directive: %s.\n", name);
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return 0;
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}
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static int Parse( FILE *InFile,
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BOOL (*sfunc)(char *),
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BOOL (*pfunc)(char *, char *) )
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/* ------------------------------------------------------------------------ **
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* Scan & parse the input.
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*
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* Input: InFile - Input source.
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* sfunc - Function to be called when a section name is scanned.
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* See Section().
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* pfunc - Function to be called when a parameter is scanned.
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* See Parameter().
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*
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* Output: 1 if the file was successfully scanned, 2 if the file was
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* scanned until a section header with no section function, else 0.
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*
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* Notes: The input can be viewed in terms of 'lines'. There are four
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* types of lines:
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* Blank - May contain whitespace, otherwise empty.
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* Comment - First non-whitespace character is a ';' or '#'.
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* The remainder of the line is ignored.
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* Section - First non-whitespace character is a '['.
|
|
* Parameter - The default case.
|
|
*
|
|
* ------------------------------------------------------------------------ **
|
|
*/
|
|
{
|
|
int c;
|
|
|
|
c = EatWhitespace( InFile );
|
|
while( (EOF != c) && (c > 0) )
|
|
{
|
|
switch( c )
|
|
{
|
|
case '\n': /* Blank line. */
|
|
c = EatWhitespace( InFile );
|
|
break;
|
|
|
|
case ';': /* Comment line. */
|
|
case '#':
|
|
c = EatComment( InFile );
|
|
break;
|
|
|
|
case '[': /* Section Header. */
|
|
if (!sfunc)
|
|
return 2;
|
|
if( !Section( InFile, sfunc ) )
|
|
return 0;
|
|
c = EatWhitespace( InFile );
|
|
break;
|
|
|
|
case '\\': /* Bogus backslash. */
|
|
c = EatWhitespace( InFile );
|
|
break;
|
|
|
|
case '&': /* Handle directives */
|
|
the_sfunc = sfunc;
|
|
the_pfunc = pfunc;
|
|
c = Parameter( InFile, parse_directives, c );
|
|
if (c != 1)
|
|
return c;
|
|
c = EatWhitespace( InFile );
|
|
break;
|
|
|
|
default: /* Parameter line. */
|
|
if( !Parameter( InFile, pfunc, c ) )
|
|
return 0;
|
|
c = EatWhitespace( InFile );
|
|
break;
|
|
}
|
|
}
|
|
return 1;
|
|
} /* Parse */
|
|
|
|
static FILE *OpenConfFile( char *FileName )
|
|
/* ------------------------------------------------------------------------ **
|
|
* Open a config file.
|
|
*
|
|
* Input: FileName - The pathname of the config file to be opened.
|
|
*
|
|
* Output: A pointer of type (FILE *) to the opened file, or NULL if the
|
|
* file could not be opened.
|
|
*
|
|
* ------------------------------------------------------------------------ **
|
|
*/
|
|
{
|
|
FILE *OpenedFile;
|
|
char *func = "params.c:OpenConfFile() -";
|
|
|
|
if( NULL == FileName || 0 == *FileName )
|
|
{
|
|
rprintf(FLOG, "%s No config filename specified.\n", func);
|
|
return( NULL );
|
|
}
|
|
|
|
OpenedFile = fopen( FileName, "r" );
|
|
if( NULL == OpenedFile )
|
|
{
|
|
rsyserr(FLOG, errno, "unable to open config file \"%s\"",
|
|
FileName);
|
|
}
|
|
|
|
return( OpenedFile );
|
|
} /* OpenConfFile */
|
|
|
|
int pm_process( char *FileName,
|
|
BOOL (*sfunc)(char *),
|
|
BOOL (*pfunc)(char *, char *) )
|
|
/* ------------------------------------------------------------------------ **
|
|
* Process the named parameter file.
|
|
*
|
|
* Input: FileName - The pathname of the parameter file to be opened.
|
|
* sfunc - A pointer to a function that will be called when
|
|
* a section name is discovered.
|
|
* pfunc - A pointer to a function that will be called when
|
|
* a parameter name and value are discovered.
|
|
*
|
|
* Output: 1 if the file was successfully parsed, 2 if parsing ended at a
|
|
* section header w/o a section function, else 0.
|
|
*
|
|
* ------------------------------------------------------------------------ **
|
|
*/
|
|
{
|
|
int result;
|
|
FILE *InFile;
|
|
char *func = "params.c:pm_process() -";
|
|
|
|
InFile = OpenConfFile( FileName ); /* Open the config file. */
|
|
if( NULL == InFile )
|
|
return( False );
|
|
|
|
if( NULL != bufr ) /* If we already have a buffer */
|
|
result = Parse( InFile, sfunc, pfunc ); /* (recursive call), then just */
|
|
/* use it. */
|
|
|
|
else /* If we don't have a buffer */
|
|
{ /* allocate one, then parse, */
|
|
bSize = BUFR_INC; /* then free. */
|
|
bufr = new_array( char, bSize );
|
|
if( NULL == bufr )
|
|
{
|
|
rprintf(FLOG, "%s memory allocation failure.\n", func);
|
|
fclose(InFile);
|
|
return( False );
|
|
}
|
|
result = Parse( InFile, sfunc, pfunc );
|
|
free( bufr );
|
|
bufr = NULL;
|
|
bSize = 0;
|
|
}
|
|
|
|
fclose(InFile);
|
|
|
|
if( !result ) /* Generic failure. */
|
|
{
|
|
rprintf(FLOG, "%s Failed. Error returned from params.c:parse().\n", func);
|
|
return 0;
|
|
}
|
|
|
|
return result;
|
|
} /* pm_process */
|
|
|
|
/* -------------------------------------------------------------------------- */
|
|
|