/*

 * Copyright (c) 2014 Sunil Nimmagadda <sunil@nimmagadda.net>

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 */

#include <sys/types.h>

#include <sys/socket.h>

#include <sys/uio.h>

#include <err.h>

#include <errno.h>

#include <fcntl.h>

#include <limits.h>

#include <netdb.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <syslog.h>

#include "pop3d.h"

int debug = 0;

void

set_nonblocking(int fd)

{

	int	 flags;

	if ((flags = fcntl(fd, F_GETFL, 0)) == -1)

		fatal("fcntl F_GETFL");

	flags |= O_NONBLOCK;

	if ((flags = fcntl(fd, F_SETFL, flags)) == -1)

		fatal("fcntl F_SETFL");

}

void

log_init(int n_debug)

{

	extern char *__progname;

	debug = n_debug;

	if (!debug)

		openlog(__progname, LOG_PID | LOG_NDELAY, LOG_DAEMON);

	tzset();

}

void

fatal(const char *emsg)

{

	if (errno)

		logit(LOG_CRIT, "fatal: %s: %s\n", emsg, strerror(errno));

	else

		logit(LOG_CRIT, "fatal: %s\n", emsg);

	exit(EXIT_FAILURE);

}

void

fatalx(const char *emsg)

{

	errno = 0;

	fatal(emsg);

}

void

logit(int pri, const char *fmt, ...)

{

	va_list ap;

	va_start(ap, fmt);

	vlog(pri, fmt, ap);

	va_end(ap);

}

void

vlog(int pri, const char *fmt, va_list ap)

{

	char *nfmt;

	if (debug) {

		/* best effort in out of mem situations */

		if (asprintf(&nfmt, "%s\n", fmt) == -1) {

			vfprintf(stderr, fmt, ap);

			fprintf(stderr, "\n");

		} else {

			vfprintf(stderr, nfmt, ap);

			free(nfmt);

		}

		fflush(stderr);

	} else

		vsyslog(pri, fmt, ap);

}

void *

xcalloc(size_t nmemb, size_t size, const char *where)

{

	void	*r;

	if ((r = calloc(nmemb, size)) == NULL) {

		logit(LOG_CRIT, "%s: calloc(%zu, %zu)", where, nmemb, size);

		err(1, "exiting");

	}

	return (r);

}

int

imsgev_xcompose(struct imsgev *iev, u_int16_t type, u_int32_t peerid,

    uint32_t pid, int fd, void *data, u_int16_t datalen, const char *where)

{

	int	r;

	r = imsgev_compose(iev, type, peerid, pid, fd, data, datalen);

	if (r == -1) {

		logit(LOG_CRIT, "imsgev_xcompose: %s", where);

		errx(1, "maildrop exiting");

	}

	return (r);

}

void

iobuf_xfqueue(struct iobuf *io, const char *where, const char *fmt, ...)

{

	va_list	ap;

	int	len;

	va_start(ap, fmt);

	len = iobuf_vfqueue(io, fmt, ap);

	va_end(ap);

	if (len == -1)

		errx(1, "%s: iobuf_xfqueue(%p, %s, ...)", where, io, fmt);

}

void

iobuf_xqueue(struct iobuf *io, const char *where, const void *data, size_t len)

{

	if (iobuf_queue(io, data, len) == -1)

		errx(1, "%s: iobuf_xqueue(%p, data, %zu)", where, io, len);

}

int

get_index(struct session *s, const char *args, unsigned int *idx)

{

	const char	*errstr;

	*idx = strtonum(args, 1, UINT_MAX, &errstr);

	if (errstr || *idx < 1 || *idx > s->nmsgs) {

		logit(LOG_INFO, "%zu: Invalid index", s->id);

		session_reply(s, "%s", "-ERR invalid index");

		return (0);

	}

	*idx -= 1; /* make it zero based */

	return (1);

}

void

log_connect(uint32_t id, struct sockaddr_storage *s, socklen_t s_len)

{

	char	hbuf[NI_MAXHOST];

	int	e;

	e = getnameinfo((struct sockaddr *)s, s_len, hbuf, sizeof(hbuf),

	    NULL, 0, NI_NUMERICHOST);

	if (e) {

		logit(LOG_DEBUG, "getnameinfo: %s", gai_strerror(e));

		logit(LOG_INFO, "new session with id %u", id);

	} else

		logit(LOG_INFO, "new session with id %u from %s", id, hbuf);

}