LIBINN(3) Library Functions Manual LIBINN(3)
NAME
libinn - InterNetNews library routines
SYNOPSIS
#include "libinn.h"
typedef struct _TIMEINFO {
time_t time;
long usec;
long tzone;
} TIMEINFO;
char *
GenerateMessageID(domain)
char *domain;
void
HeaderCleanFrom(from)
char *from;
char *
HeaderFind(Article, Header, size)
char *Article;
char *Header;
int size;
FILE *
CAopen(FromServer, ToServer)
FILE *FromServer;
FILE *ToServer;
FILE *
CAlistopen(FromServer, ToServer, request)
FILE *FromServer;
FILE *ToServer;
char *request;
void
CAclose()
struct _DDHANDLE *
DDstart(FromServer, ToServer)
FILE *FromServer;
FILE *ToServer;
void
DDcheck(h, group)
DDHANDLE *h;
char *group;
char *
DDend(h)
DDHANDLE *h;
void
CloseOnExec(fd, flag)
int fd;
int flag;
int
SetNonBlocking(fd, flag)
int fd;
int flag;
BOOL
lock_file(fd, type, flag)
int fd;
LOCKTYPE type;
BOOL block;
int
ReadInnConf()
char *
GetFQDN(domain)
char *domain;
char *
GetModeratorAddress(FromServer, ToServer, group, moderatormailer)
FILE *FromServer;
FILE *ToServer;
char *group;
char *moderatormailer;
int
GetResourceUsage(usertime, systime)
double *usertime;
double *systime;
int
GetTimeInfo(now)
TIMEINFO *now;
int
NNTPlocalopen(FromServerp, ToServerp, errbuff)
FILE **FromServerp;
FILE **ToServerp;
char *errbuff;
int
NNTPremoteopen(port, FromServerp, ToServerp, errbuff)
int port;
FILE **FromServerp;
FILE **ToServerp;
char *errbuff;
int
NNTPconnect(host, port, FromServerp, ToServerp, errbuff)
char *host;
int port;
FILE **FromServerp;
FILE **ToServerp;
char *errbuff;
int
NNTPcheckarticle(text)
char *text;
int
NNTPsendarticle(text, ToServer, Terminate)
char *text;
FILE *ToServer;
int Terminate;
int
NNTPsendpassword(server, FromServer, ToServer)
char *server;
FILE *FromServer;
FILE *ToServer;
void
Radix32(value, p)
unsigned long value;
char *p;
char *
ReadInFile(name, Sbp)
char *name;
struct stat *Sbp;
char *
ReadInDescriptor(fd, Sbp)
int fd;
struct stat *Sbp;
char *
INNVersion()
HASH
HashMessageID(MessageID)
const char *MessageID;
DESCRIPTION
Libinn is a library of utility routines for manipulating Usenet articles and related data. It is not necessary to use the header file lib-
inn.h; if it is not available, it is only necessary to properly declare the TIMEINFO datatype, as given above.
GenerateMessageID uses the current time, process-ID, and fully-qualified domain name, which is passed as an argument and used if local host
can not be resolved or it is different from ``domain'' set in inn.conf(5) , to create a Message-ID header that is highly likely to be
unique. The returned value points to static space that is reused on subsequent calls.
HeaderCleanFrom removes the extraneous information from the value of a ``From'' or ``Reply-To'' header and leaves just the official mailing
address. In particular, the following transformations are made to the from parameter:
address --> address
address (stuff) --> address
stuff <address> --> address
The transformations are simple, based on RFC 1036 which limits the format of the header.
HeaderFind searches through Article looking for the specified Header. Size should be the length of the header name. It returns a pointer
to the value of the header, skipping leading whitespace, or NULL if the header cannot be found. Article should be a standard C string con-
taining the text of the article; the end of the headers is indicated by a blank line -- two consecutive
characters.
CAopen and CAclose provide news clients with access to the active file; the ``CA'' stands for Client Active. CAopen opens the active(5)
file for reading. It returns a pointer to an open FILE, or NULL on error. If a local or NFS-mounted copy exists, CAopen will use that
file. The FromServer and ToServer parameters should be FILE's connected to the NNTP server for input and output, respectively. See NNT-
Premoteopen or NNTPlocalopen, below. If either parameter is NULL, then CAopen will just return NULL if the file is not locally available.
If they are not NULL, CAopen will use them to query the NNTP server using the ``list'' command to make a local temporary copy.
The CAlistopen sends a ``list'' command to the server and returns a temporary file containing the results. The request parameter, if not
NULL, will be sent as an argument to the command. Unlike CAopen, this routine will never use a locally-available copy of the active file.
CAclose closes the active file and removes any temporary file that might have been created by CAopen or CAlistopen.
CloseOnExec can make a descriptor ``close-on-exec'' so that it is not shared with any child processes. If the flag is non-zero, the file
is so marked; if zero, the ``close-on-exec'' mode is cleared.
DDstart, DDcheck, and DDend are used to set the Distribution header; the ``DD'' stands for Default Distribution. The distrib.pats(5) file
is consulted to determine the proper value for the Distribution header after all newsgroups have been checked. DDstart begins the parsing.
It returns a pointer to an opaque handle that should be used on subsequent calls. The FromServer and ToServer parameters should be FILE's
connected to the NNTP server for input and output, respectively. If either parameter is NULL, then an empty default will ultimately be
returned if the file is not locally available.
DDcheck should be called with the handle, h, returned by DDstart and a newgroups, group, to check. It can be called as often as necessary.
DDend releases any state maintained in the handle and returns an allocated copy of the text that should be used for the Distribution
header.
SetNonBlocking enables (if flag is non-zero) or disables (if flag is zero) non-blocking I/O on the indicated descriptor. It returns -1 on
failure or zero on success.
lock_file tries to lock the file descriptor fd. If block is TRUE it will block until the lock can be made, otherwise it will return FALSE
if the file cannot be locked. type is one of: LLOCK_READ, LLOCK_WRITE, or LOCK_UNLOCK. It returns FALSE on failure or TRUE on success.
ReadInnConf Reads the values of the inn.conf(5) parameters into the innconf stucture for use as ``innconf->varname''. The return value is
less than zero if an error was encountere or zero on success.
GetFQDN returns the fully-qualified domain name of the local host. Domain is used if local host can not be resolved. The returned value
points to static space that is reused on subsequent calls, or NULL on error.
GetModeratorAddress returns the mailing address of the moderator for specified group or NULL on error. Moderatormailer is used as its
address, if there is no matched moderator. See moderators(5) for details on how the address is determined. GetModeratorAddress does no
checking to see if the specified group is actually moderated. The returned value points to static space that is reused on subsequent
calls. The FromServer and ToServer parameters should be FILE's connected to the NNTP server for input and output, respectively. If either
of these parameters is NULL, then an attempt to get the list from a local copy is made.
GetResourceUsage fills in the usertime and systime parameters with the total user and system time used by the current process and any chil-
dren it may have spawned. If <HAVE_GETRUSAGE in include/config.h> is defined, it gets the values by doing a getrusage(2) system call; oth-
erwise it calls times(2). It returns -1 on failure, or zero on success.
GetTimeInfo fills in the now parameter with information about the current time and tzone. The ``time'' and ``usec'' fields will be filled
in by a call to gettimeofday(2) if <$ac_cv_func_gettimeofday in config.cache> is ``yes''. Otherwise, the ``time'' field will be filled in
by a call to time(2), and the ``usec'' field will be set to zero. The ``tzone'' field will be filled in with the current offset from GMT.
If <HAVE_TM_GMTOFF in include/config.h> is defined, this is done by calling localtime(3) and taking the value of the ``tm_gmtoff'' field,
negating it, and dividing it by 60. Otherwise, this is done by calling localtime(3) and comparing the value with that returned by a call
to gmtime(3).
For efficiency, the ``tzone'' field is only recalculated if more than an hour pass passed since the last time GetTimeInfo has been called.
This routine returns -1 on failure, or zero on success.
NNTPlocalopen opens a connection to the private port of an InterNetNews server running on the local host, if <HAVE_UNIX_DOMAIN_SOCKETS in
include/config.h> is defined. It returns -1 on failure, or zero on success. FromServerp and ToServerp will be filled in with FILE's which
can be used to communicate with the server. Errbuff can either be NULL or a pointer to a buffer at least 512 bytes long. If not NULL, and
the server refuses the connection, then it will be filled in with the text of the server's reply. This routine is not for general use. If
<HAVE_UNIX_DOMAIN_SOCKETS in include/config.h> is not defined, this is a stub routine, for compatibility with systems that have Unix-domain
stream sockets. It always returns -1.
NNTPremoteopen does the same except that it uses ``innconf->server'' as the local server, and opens a connection to the port. Any client
program can use this routine. It returns -1 on failure, or zero on success.
NNTPconnect is the same as NNTPremoteopen except that the desired host is given as the host parameter.
NNTPcheckarticle verifies that the text meets the NNTP limitations on line length. It returns -1 on failure, or zero if the text is valid.
NNTPsendarticle writes text on ToServer using NNTP conventions for line termination. The text should consist of one or more lines ending
with a newline. If Terminate is non-zero, then the routine will also write the NNTP data-termination marker on the stream. It returns -1
on failure, or zero on success.
NNTPsendpassword sends authentication information to an NNTP server by finding the appropriate entry in the passwd.nntp(5) file. Server
contains the name of the host; ``innconf->server'' will be used if server is NULL. FromServer and ToServer should be FILE's that are con-
nected to the server. No action is taken if the specified host is not listed in the password file.
Radix32 converts the number in value into a radix-32 string into the buffer pointed to by p. The number is split into five-bit pieces and
each pieces is converted into a character using the alphabet 0..9a..v to represent the numbers 0..32. Only the lowest 32 bits of value are
used, so p need only point to a buffer of eight bytes (seven characters and the trailing ).
ReadInFile reads the file named name into allocated memory, appending a terminating byte. It returns a pointer to the space, or NULL on
error. If Sbp is not NULL, it is taken as the address of a place to store the results of a stat(2) call.
ReadInDescriptor performs the same function as ReadInFile except that fd refers to an already-open file.
INNVersion returns a pointer to a string identifying the INN version, suitable for printing in logon banners.
HashMessageID returns hashed message-id using MD5.
EXAMPLES
char *p;
char *Article;
char buff[256], errbuff[256];
FILE *F;
FILE *ToServer;
FILE *FromServer;
int port = 119;
if ((p = HeaderFind(Article, "From", 4)) == NULL)
Fatal("Can't find From line");
(void)strcpy(buff, p);
HeaderCleanFrom(buff);
if ((F = CAopen(FromServer, ToServer)) == NULL)
Fatal("Can't open active file");
/* Don't pass the file on to our children. */
CloseOnExec(fileno(F), 1);
/* Make a local copy. */
p = ReadInDescriptor(fileno(F), (struct stat *)NULL);
/* Close the file. */
CAclose();
if (NNTPremoteopen(port, &FromServer, &ToServer, errbuff) < 0)
Fatal("Can't connect to server");
if ((p = GetModeratorAddress("comp.sources.unix")) == NULL)
Fatal("Can't find moderator's address");
HISTORY
Written by Rich $alz <rsalz@uunet.uu.net> for InterNetNews. This is revision 1.8.2.1, dated 2000/08/17.
SEE ALSO
active(5), dbz(3z), parsedate(3), inn.conf(5), inndcomm(3), moderators(5), passwd.nntp(5).
LIBINN(3)