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/*	$OpenBSD: util.c,v 1.9 2021/04/12 10:03:33 claudio Exp $ */

/*
 * Copyright (c) 2009 Claudio Jeker <claudio@openbsd.org>
 *
 * 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/queue.h>
#include <sys/socket.h>
#include <sys/uio.h>

#include <scsi/iscsi.h>

#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "iscsid.h"
#include "log.h"

struct pdu *
pdu_new(void)
{
	struct pdu *p;

	if (!(p = calloc(1, sizeof(*p))))
		return NULL;
	return p;
}

void *
pdu_alloc(size_t len)
{
	return malloc(PDU_LEN(len));
}

void *
pdu_dup(void *data, size_t len)
{
	void *p;

	if ((p = malloc(PDU_LEN(len))))
		memcpy(p, data, len);
	return p;
}

int
pdu_addbuf(struct pdu *p, void *buf, size_t len, unsigned int elm)
{
	if (len & 0x3) {
		bzero((char *)buf + len, 4 - (len & 0x3));
		len += 4 - (len & 0x3);
	}

	if (elm < PDU_MAXIOV)
		if (!p->iov[elm].iov_base) {
			p->iov[elm].iov_base = buf;
			p->iov[elm].iov_len = len;
			return 0;
		}

	/* no space left */
	return -1;
}

void *
pdu_getbuf(struct pdu *p, size_t *len, unsigned int elm)
{
	if (len)
		*len = 0;
	if (elm < PDU_MAXIOV)
		if (p->iov[elm].iov_base) {
			if (len)
				*len = p->iov[elm].iov_len;
			return p->iov[elm].iov_base;
		}

	return NULL;
}

void
pdu_free(struct pdu *p)
{
	unsigned int j;

	for (j = 0; j < PDU_MAXIOV; j++)
		free(p->iov[j].iov_base);
	free(p);
}

int
socket_setblockmode(int fd, int nonblocking)
{
	int flags;

	if ((flags = fcntl(fd, F_GETFL)) == -1)
		return -1;

	if (nonblocking)
		flags |= O_NONBLOCK;
	else
		flags &= ~O_NONBLOCK;

	if ((flags = fcntl(fd, F_SETFL, flags)) == -1)
		return -1;
	return 0;
}

const char *
log_sockaddr(void *arg)
{
	struct sockaddr *sa = arg;
	char port[6];
	char host[NI_MAXHOST];
	static char buf[NI_MAXHOST + 8];

	if (getnameinfo(sa, sa->sa_len, host, sizeof(host), port, sizeof(port),
	    NI_NUMERICHOST))
		return "unknown";
	if (port[0] == '0')
		strlcpy(buf, host, sizeof(buf));
	else if (sa->sa_family == AF_INET)
		snprintf(buf, sizeof(buf), "%s:%s", host, port);
	else
		snprintf(buf, sizeof(buf), "[%s]:%s", host, port);
	return buf;
}

int
control_compose(void *ch, u_int16_t type, void *buf, size_t len)
{
	return control_build(ch, type, 1, CTRLARGV({ buf, len }));
}

int
control_build(void *ch, u_int16_t type, int argc, struct ctrldata *argv)
{
	struct pdu *pdu;
	struct ctrlmsghdr *cmh;
	size_t size = 0;
	int i;

	if (argc > (int)nitems(cmh->len))
		return -1;

	for (i = 0; i < argc; i++)
		size += argv[i].len;
	if (PDU_LEN(size) > CONTROL_READ_SIZE - PDU_LEN(sizeof(*cmh)))
		return -1;

	if ((pdu = pdu_new()) == NULL)
		return -1;
	if ((cmh = pdu_alloc(sizeof(*cmh))) == NULL)
		goto fail;
	bzero(cmh, sizeof(*cmh));
	cmh->type = type;
	pdu_addbuf(pdu, cmh, sizeof(*cmh), 0);

	for (i = 0; i < argc; i++)
		if (argv[i].len > 0) {
			void *ptr;

			cmh->len[i] = argv[i].len;
			if ((ptr = pdu_alloc(argv[i].len)) == NULL)
				goto fail;
			memcpy(ptr, argv[i].buf, argv[i].len);
			pdu_addbuf(pdu, ptr, argv[i].len, i + 1);
		}

	control_queue(ch, pdu);
	return 0;
fail:
	pdu_free(pdu);
	return -1;
}