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For open/openat, if the flags parameter does not contain O_CREAT, the
3rd (variadic) mode_t parameter is irrelevant.  Many developers in the past
have passed mode_t (0, 044, 0644, or such), which might lead future people
to copy this broken idiom, and perhaps even believe this parameter has some
meaning or implication or application. Delete them all.
This comes out of a conversation where tb@ noticed that a strange (but
intentional) pledge behaviour is to always knock-out high-bits from
mode_t on a number of system calls as a safety factor, and his bewilderment
that this appeared to be happening against valid modes (at least visually),
but no sorry, they are all irrelevant junk.  They could all be 0xdeafbeef.
ok millert

/* $OpenBSD: ui.c,v 1.58 2021/10/24 21:24:21 deraadt Exp $	 */
/* $EOM: ui.c,v 1.43 2000/10/05 09:25:12 niklas Exp $	 */

/*
 * Copyright (c) 1998, 1999, 2000 Niklas Hallqvist.  All rights reserved.
 * Copyright (c) 1999, 2000, 2001, 2002 Håkan Olsson.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * This code was written under funding by Ericsson Radio Systems.
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#include "conf.h"
#include "connection.h"
#include "doi.h"
#include "exchange.h"
#include "init.h"
#include "isakmp.h"
#include "log.h"
#include "monitor.h"
#include "sa.h"
#include "timer.h"
#include "transport.h"
#include "ui.h"
#include "util.h"

#define BUF_SZ 256

/* from isakmpd.c */
void		 daemon_shutdown_now(int);

/* Report all SA configuration information. */
void		 ui_report_sa(char *);

static FILE	*ui_open_result(void);

char		*ui_fifo = FIFO;
int		 ui_socket;
struct event	*ui_cr_event = NULL;
int		 ui_daemon_passive = 0;

/* Create and open the FIFO used for user control.  */
void
ui_init(void)
{
	struct stat     st;

	/* -f- means control messages comes in via stdin.  */
	if (strcmp(ui_fifo, "-") == 0) {
		ui_socket = 0;
		return;
	}

	/* Don't overwrite a file, i.e '-f /etc/isakmpd/isakmpd.conf'.  */
	if (lstat(ui_fifo, &st) == 0) {
		if (S_ISREG(st.st_mode)) {
			errno = EEXIST;
			log_fatal("ui_init: could not create FIFO \"%s\"",
			    ui_fifo);
		}
	}

	/* No need to know about errors.  */
	unlink(ui_fifo);
	if (mkfifo(ui_fifo, 0600) == -1)
		log_fatal("ui_init: mkfifo (\"%s\", 0600) failed", ui_fifo);

	ui_socket = open(ui_fifo, O_RDWR | O_NONBLOCK);
	if (ui_socket == -1)
		log_fatal("ui_init: open (\"%s\", O_RDWR | O_NONBLOCK, 0) "
		    "failed", ui_fifo);
}

/*
 * Setup a phase 2 connection.
 * XXX Maybe phase 1 works too, but teardown won't work then, fix?
 */
static void
ui_connect(char *cmd)
{
	char	name[201];

	if (sscanf(cmd, "c %200s", name) != 1) {
		log_print("ui_connect: command \"%s\" malformed", cmd);
		return;
	}
	LOG_DBG((LOG_UI, 10, "ui_connect: setup connection \"%s\"", name));
	connection_setup(name);
}

/* Tear down a connection, can be phase 1 or 2.  */
static void
ui_teardown(char *cmd)
{
	struct sockaddr_in	 addr;
	struct sockaddr_in6	 addr6;
	struct sa		*sa;
	int			 phase;
	char			 name[201];

	/* If no phase is given, we default to phase 2. */
	phase = 2;
	if (sscanf(cmd, "t main %200s", name) == 1)
		phase = 1;
	else if (sscanf(cmd, "t quick %200s", name) == 1)
		phase = 2;
	else if (sscanf(cmd, "t %200s", name) != 1) {
		log_print("ui_teardown: command \"%s\" malformed", cmd);
		return;
	}
	LOG_DBG((LOG_UI, 10, "ui_teardown: teardown connection \"%s\", "
	    "phase %d", name, phase));

	bzero(&addr, sizeof(addr));
	bzero(&addr6, sizeof(addr6));

	if (inet_pton(AF_INET, name, &addr.sin_addr) == 1) {
		addr.sin_len = sizeof(addr);
		addr.sin_family = AF_INET;

		while ((sa = sa_lookup_by_peer((struct sockaddr *)&addr,
		    SA_LEN((struct sockaddr *)&addr), phase)) != 0) {
			if (sa->name)
				connection_teardown(sa->name);
			sa_delete(sa, 1);
		}
	} else if (inet_pton(AF_INET6, name, &addr6.sin6_addr) == 1) {
		addr6.sin6_len = sizeof(addr6);
		addr6.sin6_family = AF_INET6;

		while ((sa = sa_lookup_by_peer((struct sockaddr *)&addr6,
		    SA_LEN((struct sockaddr *)&addr6), phase)) != 0) {
			if (sa->name)
				connection_teardown(sa->name);
			sa_delete(sa, 1);
		}
	} else {
		if (phase == 2)
			connection_teardown(name);
		while ((sa = sa_lookup_by_name(name, phase)) != 0)
			sa_delete(sa, 1);
	}
}

/* Tear down all phase 2 connections.  */
static void
ui_teardown_all(char *cmd)
{
	/* Skip 'cmd' as arg. */
	sa_teardown_all();
}

static void
ui_conn_reinit_event(void *v)
{
	/*
	 * This event is required for isakmpd to reinitialize the connection
	 * and passive-connection lists. Otherwise a change to the
	 * "[Phase 2]:Connections" tag will not have any effect.
	 */
	connection_reinit();

	ui_cr_event = NULL;
}

static void
ui_conn_reinit(void)
{
	struct timespec ts;

	if (ui_cr_event)
		timer_remove_event(ui_cr_event);

	clock_gettime(CLOCK_MONOTONIC, &ts);
	ts.tv_sec += 5;

	ui_cr_event = timer_add_event("ui_conn_reinit", ui_conn_reinit_event,
	    0, &ts);
	if (!ui_cr_event)
		log_print("ui_conn_reinit: timer_add_event() failed. "
		    "Connections will not be updated.");
}

/*
 * Call the configuration API.
 * XXX Error handling!  How to do multi-line transactions?
 */
static void
ui_config(char *cmd)
{
	struct conf_list *vlist;
	struct conf_list_node *vnode;
	char	 subcmd[201], section[201], tag[201], value[201], tmp[201];
	char	*v, *nv;
	int	 trans = 0, items, skip = 0, ret;
	FILE	*fp;

	if (sscanf(cmd, "C %200s", subcmd) != 1)
		goto fail;

	if (strcasecmp(subcmd, "get") == 0) {
		if (sscanf(cmd, "C %*s [%200[^]]]:%200s", section, tag) != 2)
			goto fail;
		v = conf_get_str(section, tag);
		fp = ui_open_result();
		if (fp) {
			if (v)
				fprintf(fp, "%s\n", v);
			fclose(fp);
		}
		LOG_DBG((LOG_UI, 30, "ui_config: \"%s\"", cmd));
		return;
	}

	trans = conf_begin();
	if (strcasecmp(subcmd, "set") == 0) {
		items = sscanf(cmd, "C %*s [%200[^]]]:%200[^=]=%200s %200s",
		    section, tag, value, tmp);
		if (!(items == 3 || items == 4))
			goto fail;
		conf_set(trans, section, tag, value, items == 4 ? 1 : 0, 0);
		if (strcasecmp(section, "Phase 2") == 0 &&
		    (strcasecmp(tag, "Connections") == 0 ||
			strcasecmp(tag, "Passive-connections") == 0))
			ui_conn_reinit();
	} else if (strcasecmp(subcmd, "add") == 0) {
		items = sscanf(cmd, "C %*s [%200[^]]]:%200[^=]=%200s %200s",
		    section, tag, value, tmp);
		if (!(items == 3 || items == 4))
			goto fail;
		v = conf_get_str(section, tag);
		if (!v)
			conf_set(trans, section, tag, value, 1, 0);
		else {
			vlist = conf_get_list(section, tag);
			if (vlist) {
				for (vnode = TAILQ_FIRST(&vlist->fields);
				    vnode;
				    vnode = TAILQ_NEXT(vnode, link)) {
					if (strcmp(vnode->field, value) == 0) {
						skip = 1;
						break;
					}
				}
				conf_free_list(vlist);
			}
			/* Add the new value to the end of the 'v' list.  */
			if (skip == 0) {
				if (asprintf(&nv,
				    v[strlen(v) - 1] == ',' ? "%s%s" : "%s,%s",
				    v, value) == -1) {
					log_error("ui_config: malloc() failed");
					if (trans)
						conf_end(trans, 0);
					return;
				}
				conf_set(trans, section, tag, nv, 1, 0);
				free(nv);
			}
		}
		if (strcasecmp(section, "Phase 2") == 0 &&
		    (strcasecmp(tag, "Connections") == 0 ||
			strcasecmp(tag, "Passive-connections") == 0))
			ui_conn_reinit();
	} else if (strcasecmp(subcmd, "rmv") == 0) {
		items = sscanf(cmd, "C %*s [%200[^]]]:%200[^=]=%200s %200s",
		    section, tag, value, tmp);
		if (!(items == 3 || items == 4))
			goto fail;
		vlist = conf_get_list(section, tag);
		if (vlist) {
			nv = v = NULL;
			for (vnode = TAILQ_FIRST(&vlist->fields);
			    vnode;
			    vnode = TAILQ_NEXT(vnode, link)) {
				if (strcmp(vnode->field, value) == 0)
					continue;
				ret = v ?
				    asprintf(&nv, "%s,%s", v, vnode->field) :
				    asprintf(&nv, "%s", vnode->field);
				free(v);
				if (ret == -1) {
					log_error("ui_config: malloc() failed");
					if (trans)
						conf_end(trans, 0);
					return;
				}
				v = nv;
			}
			conf_free_list(vlist);
			if (nv) {
				conf_set(trans, section, tag, nv, 1, 0);
				free(nv);
			} else {
				conf_remove(trans, section, tag);
			}
		}
		if (strcasecmp(section, "Phase 2") == 0 &&
		    (strcasecmp(tag, "Connections") == 0 ||
			strcasecmp(tag, "Passive-connections") == 0))
			ui_conn_reinit();
	} else if (strcasecmp(subcmd, "rm") == 0) {
		if (sscanf(cmd, "C %*s [%200[^]]]:%200s", section, tag) != 2)
			goto fail;
		conf_remove(trans, section, tag);
	} else if (strcasecmp(subcmd, "rms") == 0) {
		if (sscanf(cmd, "C %*s [%200[^]]]", section) != 1)
			goto fail;
		conf_remove_section(trans, section);
	} else
		goto fail;

	LOG_DBG((LOG_UI, 30, "ui_config: \"%s\"", cmd));
	conf_end(trans, 1);
	return;

fail:
	if (trans)
		conf_end(trans, 0);
	log_print("ui_config: command \"%s\" malformed", cmd);
}

static void
ui_delete(char *cmd)
{
	char            cookies_str[ISAKMP_HDR_COOKIES_LEN * 2 + 1];
	char            message_id_str[ISAKMP_HDR_MESSAGE_ID_LEN * 2 + 1];
	u_int8_t        cookies[ISAKMP_HDR_COOKIES_LEN];
	u_int8_t        message_id_buf[ISAKMP_HDR_MESSAGE_ID_LEN];
	u_int8_t       *message_id = message_id_buf;
	struct sa      *sa;

	if (sscanf(cmd, "d %32s %8s", cookies_str, message_id_str) != 2) {
		log_print("ui_delete: command \"%s\" malformed", cmd);
		return;
	}
	if (strcmp(message_id_str, "-") == 0)
		message_id = 0;

	if (hex2raw(cookies_str, cookies, ISAKMP_HDR_COOKIES_LEN) == -1 ||
	    (message_id && hex2raw(message_id_str, message_id_buf,
	    ISAKMP_HDR_MESSAGE_ID_LEN) == -1)) {
		log_print("ui_delete: command \"%s\" has bad arguments", cmd);
		return;
	}
	sa = sa_lookup(cookies, message_id);
	if (!sa) {
		log_print("ui_delete: command \"%s\" found no SA", cmd);
		return;
	}
	LOG_DBG((LOG_UI, 20,
	    "ui_delete: deleting SA for cookie \"%s\" msgid \"%s\"",
	    cookies_str, message_id_str));
	sa_delete(sa, 1);
}

/* Parse the debug command found in CMD.  */
static void
ui_debug(char *cmd)
{
	int             cls, level;
	char            subcmd[3];

	if (sscanf(cmd, "D %d %d", &cls, &level) == 2) {
		log_debug_cmd(cls, level);
		return;
	} else if (sscanf(cmd, "D %2s %d", subcmd, &level) == 2) {
		switch (subcmd[0]) {
		case 'A':
			for (cls = 0; cls < LOG_ENDCLASS; cls++)
				log_debug_cmd(cls, level);
			return;
		}
	} else if (sscanf(cmd, "D %2s", subcmd) == 1) {
		switch (subcmd[0]) {
		case 'T':
			log_debug_toggle();
			return;
		}
	}
	log_print("ui_debug: command \"%s\" malformed", cmd);
}

static void
ui_packetlog(char *cmd)
{
	char	subcmd[201];

	if (sscanf(cmd, "p %200s", subcmd) != 1)
		goto fail;

	if (strncasecmp(subcmd, "on=", 3) == 0) {
		/* Start capture to a new file.  */
		if (subcmd[strlen(subcmd) - 1] == '\n')
			subcmd[strlen(subcmd) - 1] = 0;
		log_packet_restart(subcmd + 3);
	} else if (strcasecmp(subcmd, "on") == 0)
		log_packet_restart(NULL);
	else if (strcasecmp(subcmd, "off") == 0)
		log_packet_stop();
	return;

fail:
	log_print("ui_packetlog: command \"%s\" malformed", cmd);
}

static void
ui_shutdown_daemon(char *cmd)
{
	if (strlen(cmd) == 1) {
		log_print("ui_shutdown_daemon: received shutdown command");
		daemon_shutdown_now(0);
	} else
		log_print("ui_shutdown_daemon: command \"%s\" malformed", cmd);
}

/* Report SAs and ongoing exchanges.  */
void
ui_report(char *cmd)
{
	/* XXX Skip 'cmd' as arg? */
	sa_report();
	exchange_report();
	transport_report();
	connection_report();
	timer_report();
	conf_report();
}

/* Report all SA configuration information.  */
void
ui_report_sa(char *cmd)
{
	FILE *fp = ui_open_result();

	/* Skip 'cmd' as arg? */
	if (!fp)
		return;

	sa_report_all(fp);

	fclose(fp);
}

static void
ui_setmode(char *cmd)
{
	char	arg[11];

	if (sscanf(cmd, "M %10s", arg) != 1)
		goto fail;
	if (strncmp(arg, "active", 6) == 0) {
		if (ui_daemon_passive) 
			LOG_DBG((LOG_UI, 20,
			    "ui_setmode: switching to active mode"));
		ui_daemon_passive = 0;
	} else if (strncmp(arg, "passive", 7) == 0) {
		if (!ui_daemon_passive) 
			LOG_DBG((LOG_UI, 20,
			    "ui_setmode: switching to passive mode"));
		ui_daemon_passive = 1;
	} else
		goto fail;
	return;
	
  fail:
	log_print("ui_setmode: command \"%s\" malformed", cmd);
}


/*
 * Call the relevant command handler based on the first character of the
 * line (the command).
 */
static void
ui_handle_command(char *line)
{
	/* Find out what one-letter command was sent.  */
	switch (line[0]) {
	case 'c':
		ui_connect(line);
		break;

	case 'C':
		ui_config(line);
		break;

	case 'd':
		ui_delete(line);
		break;

	case 'D':
		ui_debug(line);
		break;

	case 'M':
		ui_setmode(line);
		break;

	case 'p':
		ui_packetlog(line);
		break;

	case 'Q':
		ui_shutdown_daemon(line);
		break;

	case 'R':
		reinit();
		break;

	case 'S':
		ui_report_sa(line);
		break;

	case 'r':
		ui_report(line);
		break;

	case 't':
		ui_teardown(line);
		break;

	case 'T':
		ui_teardown_all(line);
		break;

	default:
		log_print("ui_handle_messages: unrecognized command: '%c'",
		    line[0]);
	}
}

/*
 * A half-complex implementation of reading from a file descriptor
 * line by line without resorting to stdio which apparently have
 * troubles with non-blocking fifos.
 */
void
ui_handler(void)
{
	static char    *buf = 0;
	static char    *p;
	static size_t   sz;
	static size_t   resid;
	ssize_t         n;
	char           *new_buf;

	/* If no buffer, set it up.  */
	if (!buf) {
		sz = BUF_SZ;
		buf = malloc(sz);
		if (!buf) {
			log_print("ui_handler: malloc (%lu) failed",
			    (unsigned long)sz);
			return;
		}
		p = buf;
		resid = sz;
	}
	/* If no place left in the buffer reallocate twice as large.  */
	if (!resid) {
		new_buf = reallocarray(buf, sz, 2);
		if (!new_buf) {
			log_print("ui_handler: realloc (%p, %lu) failed", buf,
			    (unsigned long)sz * 2);
			free(buf);
			buf = 0;
			return;
		}
		buf = new_buf;
		p = buf + sz;
		resid = sz;
		sz *= 2;
	}
	n = read(ui_socket, p, resid);
	if (n == -1) {
		log_error("ui_handler: read (%d, %p, %lu)", ui_socket, p,
		    (unsigned long)resid);
		return;
	}
	if (!n)
		return;
	resid -= n;
	while (n--) {
		/*
		 * When we find a newline, cut off the line and feed it to the
		 * command processor.  Then move the rest up-front.
		 */
		if (*p == '\n') {
			*p = '\0';
			ui_handle_command(buf);
			memmove(buf, p + 1, n);
			p = buf;
			resid = sz - n;
			continue;
		}
		p++;
	}
}

static FILE *
ui_open_result(void)
{
	FILE *fp = monitor_fopen(RESULT_FILE, "w");

	if (!fp)
		log_error("ui_open_result: fopen() failed");
	return fp;
}