control.c File Reference

functions to load data from configuration files More...

#include <control.h>
#include <fmt.h>
#include <log.h>
#include <mmap.h>
#include <qdns.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/file.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <syslog.h>
#include <unistd.h>

Functions
static size_t	compact_buffer (char **buf, char *inbuf, size_t oldlen)
	compact a given buffer More...
size_t	lloadfilefd (int fd, char **buf, const int striptab)
int	loadintfd (int fd, unsigned long *result, const unsigned long def)
size_t	loadoneliner (int base, const char *filename, char **buf, const int optional)
	read a configuration file that only may contain one line More...
size_t	loadonelinerfd (int fd, char **buf)
char **	data_array (unsigned int entries, size_t datalen, void *oldbuf, size_t oldlen)
	create a combined data and pointer array More...
int	loadlistfd (int fd, char ***bufa, checkfunc cf)
int	finddomainfd (int fd, const char *domain, const int cl)
int	finddomain (const char *buf, const off_t size, const char *domain)
	search a domain entry in a given buffer More...

Variables
int	controldir_fd = -1

Detailed Description

functions to load data from configuration files

Function Documentation

static size_t compact_buffer ( char **  buf, char *  inbuf, size_t  oldlen  )

static

compact a given buffer

Parameters

buf	output parameter
inbuf	the buffer to compact
oldlen	the current length of inbuf

Returns

the length of the new buffer

Return values

0	no valid entries were found in inbuf, inbuf was freed

char** data_array	(	unsigned int	entries,
		size_t	datalen,
		void *	oldbuf,
		size_t	oldlen
	)

create a combined data and pointer array

Parameters

entries	how many entries should be in the pointer array (not counting the terminating NULL entry)
datalen	length needed for the data, 1 byte per entry is added for the terminating '\0' characters
oldbuf	if a previous buffer should be realloc()ed, may be NULL
oldlen	length of oldbuf, must be 0 if oldbuf is NULL

Returns

new buffer or NULL on error

If oldbuf is given the contents of the old buffer are moved to the beginning of the data section of the new memory area.

If oldbuf is given, but reallocation fails (i.e. NULL is returned), then oldbuf is not freed.

int finddomain	(	const char *	buf,
		const off_t	size,
		const char *	domain
	)

search a domain entry in a given buffer

Parameters

buf	containing the domain list
size	size of buffer
domain	domain name to find

Return values

1	on match
0	if none

trailing spaces and tabs in a line are ignored, lines beginning with '#' are ignored, CR in file will cause trouble

int finddomainfd	(	int	fd,
		const char *	domain,
		const int	cl
	)

mmap a file and search a domain entry in it

Parameters

fd	file descriptor
domain	domain name to find
cl	close fd or not

Return values

1	on match
0	if none
-1	on error

trainling spaces and tabs in a line are ignored, lines beginning with '#' are ignored, CR in file will cause trouble

size_t lloadfilefd	(	int	fd,
		char **	buf,
		const int	striptab
	)

load a text file into a buffer using locked IO

Parameters

fd	file descriptor of the file to load
buf	the contents of the file will go here, memory will be malloced
striptab	2: strip trailing whitespace 1: compact {'\0'}* to a single '\0' 0: do nothing but load the file into the buffer

Returns

length of buffer

Return values

-1	on error (errno is set)

if the file is empty (size 0 or only comments and blank lines) 0 is returned and buf is set to NULL

Warning

if lloadfilefd can't get a lock on the input file (e.g. currently opened for writing by another process) the file is treated as non existent

The input file will be closed before this function returns.

striptab == 2 means: the only whitespace in a non-comment line may be immediately before the line break, in any amount.

buf is always in a sane state when this function returns: either it is NULL or a valid buffer, in the latter case the return value will be >0.

int loadintfd	(	int	fd,
		unsigned long *	result,
		const unsigned long	def
	)

read a control file containing a single integer

Parameters

fd	file descriptor to read from (will be closed)
result	value will be stored here
def	default value if file does not exist

Return values

0	on success
-1	on error, parse errors in the file will set errno to EINVAL

int loadlistfd	(	int	fd,
		char ***	bufa,
		checkfunc	cf
	)

read a list from config file and validate entries

Parameters

fd	file descriptor to read from (is closed on exit!)
bufa	array to be build from buf (memory will be malloced)
cf	function to check if an entry is valid or NULL if not to

Return values

0	on success
-1	on error

If the file does not exist or has no content *bufa will be set to NULL and 0 is returned.

size_t loadoneliner	(	int	base,
		const char *	filename,
		char **	buf,
		const int	optional
	)

read a configuration file that only may contain one line

Parameters

base	descriptor of a file descriptor serving as base for relative paths
filename	don't know what this can ever mean ;)
buf	the buffer where the contents of the file will go, memory will be malloced
optional	if set to 0 write an error message to syslog if the file does not exist

Returns

length of the string

Return values

-1

on error

size_t loadonelinerfd	(	int	fd,
		char **	buf
	)

read a configuration file that only may contain one line

Parameters

fd	opened file descriptor
buf	the buffer where the contents of the file will go, memory will be malloced

Returns

length of the string

Return values

-1

on error

fd will be closed.

Variable Documentation

int controldir_fd = -1

descriptor of the control directory