Provided by: inn2-dev_2.6.4-2build4_amd64 
NAME
libinn - InterNetNews library routines
SYNOPSIS
#include "inn/libinn.h"
char *
GenerateMessageID(domain)
char *domain;
void
HeaderCleanFrom(from)
char *from;
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
fdflag_close_exec(fd, flag)
int fd;
bool flag;
int
fdflag_nonblocking(fd, flag)
socket_type fd;
bool flag;
bool
inn_lock_file(fd, type, flag)
int fd;
LOCKTYPE type;
bool block;
char *
inn_getfqdn(domain)
const 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
NNTPlocalopen(FromServerp, ToServerp, errbuff, len)
FILE **FromServerp;
FILE **ToServerp;
char *errbuff;
size_t len;
int
NNTPremoteopen(port, FromServerp, ToServerp, errbuff, len)
int port;
FILE **FromServerp;
FILE **ToServerp;
char *errbuff;
size_t len;
int
NNTPconnect(host, port, FromServerp, ToServerp, errbuff, len)
char *host;
int port;
FILE **FromServerp;
FILE **ToServerp;
char *errbuff;
size_t len;
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;
HASH
HashMessageID(MessageID)
const char *MessageID;
DESCRIPTION
Libinn is a library of utility routines for manipulating Usenet articles and related data.
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, 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 5536 which limits the format of the header.
CAopen and CAclose provide news clients with access to the active file; the ``CA'' stands for Client
Active. CAopen opens the active 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
NNTPremoteopen 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.
fdflag_close_exec 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 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.
fdflag_nonblocking 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.
inn_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: INN_LOCK_READ,
INN_LOCK_WRITE, or INN_LOCK_UNLOCK. It returns false on failure or true on success.
inn_getfqdn returns the fully qualified domain name of the local host. Domain is used to qualify the
local host name if local host can not be resolved in DNS. The returned value points to newly-allocated
memory that the caller is responsible for freeing, 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 children it may have spawned. If <HAVE_GETRUSAGE in include/config.h> is
defined, it gets the values by doing a getrusage(2) system call; otherwise it calls times(2). It 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.
Len should be the length of the buffer. 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.
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 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 connected 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 \0).
ReadInFile reads the file named name into allocated memory, appending a terminating \0 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.
HashMessageID returns hashed message-id using MD5.
EXAMPLES
char *p;
char frombuff[256], errbuff[256];
FILE *F;
FILE *ToServer;
FILE *FromServer;
int port = 119;
strlcpy(frombuff, HDR(HDR__FROM), sizeof(frombuff));
HeaderCleanFrom(frombuff);
if ((F = CAopen(FromServer, ToServer)) == NULL)
Fatal("Can't open active file");
/* Don't pass the file on to our children. */
fdflag_close_exec(fileno(F), true);
/* Make a local copy. */
p = ReadInDescriptor(fileno(F), (struct stat *)NULL);
/* Close the file. */
CAclose();
if (NNTPremoteopen(port, &FromServer, &ToServer, errbuff, sizeof(errbuff)) < 0)
Fatal("Can't connect to server");
if ((p = GetModeratorAddress(NULL, NULL, "comp.sources.unix",
"%s@example.com")) == NULL)
Fatal("Can't find moderator's address");
HISTORY
Written by Rich $alz <rsalz@uunet.uu.net> for InterNetNews. This is revision 10304, dated 2018-12-02.
SEE ALSO
active(5), dbz(3z), inn.conf(5), inndcomm(3), moderators(5), passwd.nntp(5).
LIBINN(3)