samba是个开源的文件服务器软件,可以在多个平台上运行.如果你使用过,那么一定设置过它的配置文件.
如果你想写一个类似读这样的配置文件的代码,那么下面的从samba提取出来的代码讲对你很有用.它采用
回调的机制,获取配置信息.
smb.conf 如下
# This is the main Samba configuration file. You should read the
# smb.conf(5) manual page in order to understand the options listed
# here. Samba has a huge number of configurable options (perhaps too
# many!) most of which are not shown in this example
#
# Any line which starts with a ; (semi-colon) or a # (hash)
# is a comment and is ignored. In this example we will use a #
# for commentry and a ; for parts of the config file that you
# may wish to enable
#
# NOTE: Whenever you modify this file you should run the command "testparm"
# to check that you have not made any basic syntactic errors.
#
#======================= Global Settings =====================================
[global]
# workgroup = NT-Domain-Name or Workgroup-Name
workgroup = gdcattsoft
# server string is the equivalent of the NT Description field
server string = samba server
# This option is important for security. It allows you to restrict
# connections to machines which are on your local network. The
# following example restricts access to two C class networks and
# the "loopback" interface. For more examples of the syntax see
# the smb.conf man page
; hosts allow = 192.168.1. 192.168.2. 127.
# if you want to automatically load your printer list rather
# than setting them up individually then you'll need this
printcap name = /etc/printcap
load printers = yes
# It should not be necessary to spell out the print system type unless
# yours is non-standard. Currently supported print systems include:
# bsd, sysv, plp, lprng, aix, hpux, qnx, cups
printing = cups
# Uncomment this if you want a guest account, you must add this to /etc/passwd
# otherwise the user "nobody" is used
; guest account = pcguest
# this tells Samba to use a separate log file for each machine
# that connects
log file = /var/log/samba/%m.log
# Put a capping on the size of the log files (in Kb).
max log size = 0
# Security mode. Most people will want user level security. See
# security_level.txt for details.
# Use password server option only with security = server
# The argument list may include:
# password server = My_PDC_Name [My_BDC_Name] [My_Next_BDC_Name]
# or to auto-locate the domain controller/s
# password server = *
; password server = <NT-Server-Name>
# Password Level allows matching of _n_ characters of the password for
# all combinations of upper and lower case.
; password level = 8
; username level = 8
# You may wish to use password encryption. Please read
# ENCRYPTION.txt, Win95.txt and WinNT.txt in the Samba documentation.
# Do not enable this option unless you have read those documents
encrypt passwords = yes
smb passwd file = /etc/samba/smbpasswd
# The following is needed to keep smbclient from spouting spurious errors
# when Samba is built with support for SSL.
; ssl CA certFile = /usr/share/ssl/certs/ca-bundle.crt
.....
/* -------------------------------------------------------------------------- **
*
* Module name: params
*
* -------------------------------------------------------------------------- **
*
* This module performs lexical analysis and initial parsing of a
* Windows-like parameter file. It recognizes and handles four token
* types: section-name, parameter-name, parameter-value, and
* end-of-file. Comments and line continuation are handled
* internally.
*
* The entry point to the module is function pm_process(). This
* function opens the source file, calls the Parse() function to parse
* the input, and then closes the file when either the EOF is reached
* or a fatal error is encountered.
*
* A sample parameter file might look like this:
*
* [section one]
* parameter one = value string
* parameter two = another value
* [section two]
* new parameter = some value or t'other
*
* The parameter file is divided into sections by section headers:
* section names enclosed in square brackets (eg. [section one]).
* Each section contains parameter lines, each of which consist of a
* parameter name and value delimited by an equal sign. Roughly, the
* syntax is:
*
* <file> :== { <section> } EOF
*
* <section> :== <section header> { <parameter line> }
*
* <section header> :== '[' NAME ']'
*
* <parameter line> :== NAME '=' VALUE '\n'
*
* Blank lines and comment lines are ignored. Comment lines are lines
* beginning with either a semicolon (';') or a pound sign ('#').
*
* All whitespace in section names and parameter names is compressed
* to single spaces. Leading and trailing whitespace is stipped from
* both names and values.
*
* Only the first equals sign in a parameter line is significant.
* Parameter values may contain equals signs, square brackets and
* semicolons. Internal whitespace is retained in parameter values,
* with the exception of the '\r' character, which is stripped for
* historic reasons. Parameter names may not start with a left square
* bracket, an equal sign, a pound sign, or a semicolon, because these
* are used to identify other tokens.
*
* -------------------------------------------------------------------------- **
*/
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <ctype.h>
#include <sys/stat.h>
#include <sys/types.h>
#ifdef WIN32
#include <io.h>
#define open _open
#define read _read
#define close _close
#endif
#ifndef WIN32
#include <unistd.h>
#endif
/* -------------------------------------------------------------------------- **
* Define & Constants...
*/
#define BUFR_INC 1024
#define False (0)
#define True (1)
#define Auto (2)
#ifndef _BOOL
typedef int BOOL;
#define _BOOL /* So we don't typedef BOOL again in vfs.h */
#endif
/* free memory if the pointer is valid and zero the pointer */
#ifndef SAFE_FREE
#define SAFE_FREE(x) do { if ((x) != NULL) {free((x)); (x)=NULL;} } while(0)
#endif
/* Global val set if multibyte codepage. */
extern int global_is_multibyte_codepage;
extern int (*_skip_multibyte_char)(char c);
#define skip_multibyte_char(c) ((*_skip_multibyte_char)((c)))
//#define get_character_len(x) (global_is_multibyte_codepage ? skip_multibyte_char((x)) : 0)
#define get_character_len(x) 0
/* -------------------------------------------------------------------------- **
* Variables...
*
* DEBUGLEVEL - The ubiquitous DEBUGLEVEL. This determines which //DEBUG()
* messages will be produced.
* bufr - pointer to a global buffer. This is probably a kludge,
* but it was the nicest kludge I could think of (for now).
* bSize - The size of the global buffer <bufr>.
*/
static char *bufr = NULL;
static int bSize = 0;
/* we can't use FILE* due to the 256 fd limit - use this cheap hack
instead */
typedef struct {
char *buf;
char *p;
size_t size;
} myFILE;
static int mygetc(myFILE *f)
{
if (f->p >= f->buf+f->size) return EOF;
/* be sure to return chars >127 as positive values */
return (int)( *(f->p++) & 0x00FF );
}
static void myfile_close(myFILE *f)
{
if (!f) return;
SAFE_FREE(f->buf);
SAFE_FREE(f);
}
/* -------------------------------------------------------------------------- **
* Functions...
*/
static int EatWhitespace( myFILE *InFile )
/* ------------------------------------------------------------------------ **
* Scan past whitespace (see ctype(3C)) and return the first non-whitespace
* character, or newline, or EOF.
*
* Input: InFile - Input source.
*
* Output: The next non-whitespace character in the input stream.
*
* Notes: Because the config files use a line-oriented grammar, we
* explicitly exclude the newline character from the list of
* whitespace characters.
* - Note that both EOF (-1) and the nul character ('\0') are
* considered end-of-file markers.
*
* ------------------------------------------------------------------------ **
*/
{
int c;
for( c = mygetc( InFile ); isspace( c ) && ('\n' != c); c = mygetc( InFile ) )
;
return( c );
} /* EatWhitespace */
static int EatComment( myFILE *InFile )
/* ------------------------------------------------------------------------ **
* Scan to the end of a comment.
*
* Input: InFile - Input source.
*
* Output: The character that marks the end of the comment. Normally,
* this will be a newline, but it *might* be an EOF.
*
* Notes: Because the config files use a line-oriented grammar, we
* explicitly exclude the newline character from the list of
* whitespace characters.
* - Note that both EOF (-1) and the nul character ('\0') are
* considered end-of-file markers.
*
* ------------------------------------------------------------------------ **
*/
{
int c;
for( c = mygetc( InFile ); ('\n'!=c) && (EOF!=c) && (c>0); c = mygetc( InFile ) )
;
return( c );
} /* EatComment */
/*****************************************************************************
* Scan backards within a string to discover if the last non-whitespace
* character is a line-continuation character ('\\').
*
* Input: line - A pointer to a buffer containing the string to be
* scanned.
* pos - This is taken to be the offset of the end of the
* string. This position is *not* scanned.
*
* Output: The offset of the '\\' character if it was found, or -1 to
* indicate that it was not.
*
*****************************************************************************/
static int Continuation( char *line, int pos )
{
int pos2 = 0;
pos--;
while( (pos >= 0) && isspace((int)line[pos]) )
pos--;
/* we should recognize if `\` is part of a multibyte character or not. */
while(pos2 <= pos) {
size_t skip = 0;
skip = get_character_len(line[pos2]);
if (skip) {
pos2 += skip;
} else if (pos == pos2) {
return( ((pos >= 0) && ('\\' == line[pos])) ? pos : -1 );
} else {
pos2++;
}
}
return (-1);
}
void *Realloc(void *p,size_t size)
/* ------------------------------------------------------------------------ **
* expand a pointer to be a particular size
/* ------------------------------------------------------------------------ **/
{
void *ret=NULL;
if (size == 0) {
if (p) free(p);
//DEBUG(5,("Realloc asked for 0 bytes\n"));
return NULL;
}
if (!p)
ret = (void *)malloc(size);
else
ret = (void *)realloc(p,size);
if (!ret)
printf("Memory allocation error: failed to expand to %d bytes\n",(int)size);
return(ret);
}
static BOOL Section( myFILE *InFile, BOOL (*sfunc)(char *) )
/* ------------------------------------------------------------------------ **
* Scan a section name, and pass the name to function sfunc().
*
* Input: InFile - Input source.
* sfunc - Pointer to the function to be called if the section
* name is successfully read.
*
* Output: True if the section name was read and True was returned from
* <sfunc>. False if <sfunc> failed or if a lexical error was
* encountered.
*
* ------------------------------------------------------------------------ **
*/
{
int c;
int i;
int end;
char *func = "params.c:Section() -";
i = 0; /* <i> is the offset of the next free byte in bufr[] and */
end = 0; /* <end> is the current "end of string" offset. In most */
/* cases these will be the same, but if the last */
/* character written to bufr[] is a space, then <end> */
/* will be one less than <i>. */
c = EatWhitespace( InFile ); /* We've already got the '['. Scan */
/* past initial white space. */
while( (EOF != c) && (c > 0) )
{
/* Check that the buffer is big enough for the next character. */
if( i > (bSize - 2) )
{
char *tb;
tb = (char*)Realloc( bufr, bSize +BUFR_INC );
if( NULL == tb )
{
//DEBUG(0, ("%s Memory re-allocation failure.", func) );
return( False );
}
bufr = tb;
bSize += BUFR_INC;
}
/* Handle a single character. */
switch( c )
{
case ']': /* Found the closing bracket. */
bufr[end] = '\0';
if( 0 == end ) /* Don't allow an empty name. */
{
//DEBUG(0, ("%s Empty section name in configuration file.\n", func ));
return( False );
}
//if( !sfunc( unix_to_dos(bufr) ) ) /* Got a valid name. Deal with it. */
if( !sfunc( bufr ) ) /* Got a valid name. Deal with it. */
return( False );
(void)EatComment( InFile ); /* Finish off the line. */
return( True );
case '\n': /* Got newline before closing ']'. */
i = Continuation( bufr, i ); /* Check for line continuation. */
if( i < 0 )
{
bufr[end] = '\0';
//DEBUG(0, ("%s Badly formed line in configuration file: %s\n",func, bufr ));
return( False );
}
end = ( (i > 0) && (' ' == bufr[i - 1]) ) ? (i - 1) : (i);
c = mygetc( InFile ); /* Continue with next line. */
break;
default: /* All else are a valid name chars. */
if( isspace( c ) ) /* One space per whitespace region. */
{
bufr[end] = ' ';
i = end + 1;
c = EatWhitespace( InFile );
}
else /* All others copy verbatim. */
{
bufr[i++] = c;
end = i;
c = mygetc( InFile );
}
}
}
/* We arrive here if we've met the EOF before the closing bracket. */
//DEBUG(0, ("%s Unexpected EOF in the configuration file: %s\n", func, bufr ));
return( False );
} /* Section */
static BOOL Parameter( myFILE *InFile, BOOL (*pfunc)(char *, char *), int c )
/* ------------------------------------------------------------------------ **
* Scan a parameter name and value, and pass these two fields to pfunc().
*
* Input: InFile - The input source.
* pfunc - A pointer to the function that will be called to
* process the parameter, once it has been scanned.
* c - The first character of the parameter name, which
* would have been read by Parse(). Unlike a comment
* line or a section header, there is no lead-in
* character that can be discarded.
*
* Output: True if the parameter name and value were scanned and processed
* successfully, else False.
*
* Notes: This function is in two parts. The first loop scans the
* parameter name. Internal whitespace is compressed, and an
* equal sign (=) terminates the token. Leading and trailing
* whitespace is discarded. The second loop scans the parameter
* value. When both have been successfully identified, they are
* passed to pfunc() for processing.
*
* ------------------------------------------------------------------------ **
*/
{
int i = 0; /* Position within bufr. */
int end = 0; /* bufr[end] is current end-of-string. */
int vstart = 0; /* Starting position of the parameter value. */
char *func = "params.c:Parameter() -";
/* Read the parameter name. */
while( 0 == vstart ) /* Loop until we've found the start of the value. */
{
if( i > (bSize - 2) ) /* Ensure there's space for next char. */
{
char *tb;
tb = (char*)Realloc( bufr, bSize + BUFR_INC );
if( NULL == tb )
{
//DEBUG(0, ("%s Memory re-allocation failure.", func) );
return( False );
}
bufr = tb;
bSize += BUFR_INC;
}
switch( c )
{
case '=': /* Equal sign marks end of param name. */
if( 0 == end ) /* Don't allow an empty name. */
{
//DEBUG(0, ("%s Invalid parameter name in config. file.\n", func ));
return( False );
}
bufr[end++] = '\0'; /* Mark end of string & advance. */
i = end; /* New string starts here. */
vstart = end; /* New string is parameter value. */
bufr[i] = '\0'; /* New string is nul, for now. */
break;
case '\n': /* Find continuation char, else error. */
i = Continuation( bufr, i );
if( i < 0 )
{
bufr[end] = '\0';
//DEBUG(1,("%s Ignoring badly formed line in configuration file: %s\n",func, bufr ));
return( True );
}
end = ( (i > 0) && (' ' == bufr[i - 1]) ) ? (i - 1) : (i);
c = mygetc( InFile ); /* Read past eoln. */
break;
case '\0': /* Shouldn't have EOF within param name. */
case EOF:
bufr[i] = '\0';
//DEBUG(1,("%s Unexpected end-of-file at: %s\n", func, bufr ));
return( True );
default:
if( isspace( c ) ) /* One ' ' per whitespace region. */
{
bufr[end] = ' ';
i = end + 1;
c = EatWhitespace( InFile );
}
else /* All others verbatim. */
{
bufr[i++] = c;
end = i;
c = mygetc( InFile );
}
}
}
/* Now parse the value. */
c = EatWhitespace( InFile ); /* Again, trim leading whitespace. */
while( (EOF !=c) && (c > 0) )
{
if( i > (bSize - 2) ) /* Make sure there's enough room. */
{
bSize += BUFR_INC;
bufr = (char*)Realloc( bufr, bSize );
if( NULL == bufr )
{
//DEBUG(0, ("%s Memory re-allocation failure.", func) );
return( False );
}
}
switch( c )
{
case '\r': /* Explicitly remove '\r' because the older */
c = mygetc( InFile ); /* version called fgets_slash() which also */
break; /* removes them. */
case '\n': /* Marks end of value unless there's a '\'. */
i = Continuation( bufr, i );
if( i < 0 )
c = 0;
else
{
for( end = i; (end >= 0) && isspace((int)bufr[end]); end-- )
;
c = mygetc( InFile );
}
break;
default: /* All others verbatim. Note that spaces do */
bufr[i++] = c; /* not advance <end>. This allows trimming */
if( !isspace( c ) ) /* of whitespace at the end of the line. */
end = i;
c = mygetc( InFile );
break;
}
}
bufr[end] = '\0'; /* End of value. */
return( pfunc( bufr, &bufr[vstart] ) ); /* Pass name & value to pfunc(). */
} /* Parameter */
static BOOL Parse( myFILE *InFile,
BOOL (*sfunc)(char *),
BOOL (*pfunc)(char *, char *) )
/* ------------------------------------------------------------------------ **
* Scan & parse the input.
*
* Input: InFile - Input source.
* sfunc - Function to be called when a section name is scanned.
* See Section().
* pfunc - Function to be called when a parameter is scanned.
* See Parameter().
*
* Output: True if the file was successfully scanned, else False.
*
* Notes: The input can be viewed in terms of 'lines'. There are four
* types of lines:
* Blank - May contain whitespace, otherwise empty.
* Comment - First non-whitespace character is a ';' or '#'.
* The remainder of the line is ignored.
* 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( !Section( InFile, sfunc ) )
return( False );
c = EatWhitespace( InFile );
break;
case '\\': /* Bogus backslash. */
c = EatWhitespace( InFile );
break;
default: /* Parameter line. */
if( !Parameter( InFile, pfunc, c ) )
return( False );
c = EatWhitespace( InFile );
break;
}
}
return( True );
} /* Parse */
/****************************************************************************
load a file into memory from a fd.
****************************************************************************/
char *fd_load(int fd, size_t *size)
{
struct stat sbuf;
char *p;
if (fstat(fd, &sbuf) != 0) return NULL;
p = (char *)malloc(sbuf.st_size+1);
if (!p) return NULL;
if (read(fd, p, sbuf.st_size) != sbuf.st_size) {
SAFE_FREE(p);
return NULL;
}
p[sbuf.st_size] = 0;
if (size) *size = sbuf.st_size;
return p;
}
/****************************************************************************
load a file into memory
****************************************************************************/
char *file_load(char *fname, size_t *size)
{
int fd;
char *p;
if (!fname || !*fname) return NULL;
fd = open( fname, O_RDONLY );
if (fd == -1) return NULL;
p = fd_load(fd, size);
close(fd);
return p;
}
static myFILE *OpenConfFile( char *FileName )
/* ------------------------------------------------------------------------ **
* Open a configuration file.
*
* Input: FileName - The pathname of the config file to be opened.
*
* Output: A pointer of type (char **) to the lines of the file
*
* ------------------------------------------------------------------------ **
*/
{
char *func = "params.c:OpenConfFile() -";
//extern BOOL in_client;
//int lvl = in_client?1:0;
myFILE *ret;
ret = (myFILE *)malloc(sizeof(*ret));
if (!ret) return NULL;
ret->buf = file_load(FileName, &ret->size);
if( NULL == ret->buf )
{
//DEBUG( lvl,
// ("%s Unable to open configuration file \"%s\":\n\t%s\n",
// func, FileName, strerror(errno)) );
SAFE_FREE(ret);
return NULL;
}
ret->p = ret->buf;
return( ret );
} /* OpenConfFile */
BOOL 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: TRUE if the file was successfully parsed, else FALSE.
*
* ------------------------------------------------------------------------ **
*/
{
int result;
myFILE *InFile;
char *func = "params.c:pm_process() -";
InFile = OpenConfFile( FileName ); /* Open the config file. */
if( NULL == InFile )
return( False );
//DEBUG( 3, ("%s Processing configuration file \"%s\"\n", func, FileName) );
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 = (char *)malloc( bSize );
if( NULL == bufr )
{
//DEBUG(0,("%s memory allocation failure.\n", func));
myfile_close(InFile);
return( False );
}
result = Parse( InFile, sfunc, pfunc );
SAFE_FREE( bufr );
bufr = NULL;
bSize = 0;
}
myfile_close(InFile);
if( !result ) /* Generic failure. */
{
//DEBUG(0,("%s Failed. Error returned from params.c:parse().\n", func));
return( False );
}
return( True ); /* Generic success. */
} /* pm_process */
/* -------------------------------------------------------------------------- */
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