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Replace <sys/param.h> with <limits.h> and other less dirty headers where
possible.  Annotate <sys/param.h> lines with their current reasons.  Switch
to PATH_MAX, NGROUPS_MAX, HOST_NAME_MAX+1, LOGIN_NAME_MAX, etc.  Change
MIN() and MAX() to local definitions of MINIMUM() and MAXIMUM() where
sensible to avoid pulling in the pollution.  These are the files confirmed
through binary verification.
ok guenther, millert, doug (helped with the verification protocol)

/* $OpenBSD: cddb.c,v 1.20 2015/01/16 06:40:06 deraadt Exp $ */
/*
 * Copyright (c) 2002 Marc Espie.
 *
 * 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 OPENBSD PROJECT AND CONTRIBUTORS
 * ``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 OPENBSD
 * PROJECT OR CONTRIBUTORS 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.
 */

#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/cdio.h>
#include <err.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <vis.h>
#include "extern.h"

unsigned long	cddb_sum(unsigned long);
void		send_hello(FILE *);
void		send_query(FILE *, int, struct cd_toc_entry *);
int		further_query(FILE *, char *);
int		connect_to(const char *, const char *);
int		parse_connect_to(const char *, const char *);
char *		get_line(FILE *);
char *		get_answer(FILE *);
void		verify_track_names(char **, int, struct cd_toc_entry *);
void		safe_copy(char **, const char *);

unsigned long
cddb_sum(unsigned long v)
{
	unsigned long sum = 0;

	while (v > 0) {
		sum += v % 10;
		v /= 10;
	}
	return (sum);
}

unsigned long
cddb_discid(int n, struct cd_toc_entry *e)
{
	unsigned long sum;
	int i;

	sum = 0;
	for (i =0; i < n; i++)
		sum += cddb_sum(entry2time(e+i));
	return (((sum % 0xff) << 24) |
	    ((entry2time(e+n) - entry2time(e)) << 8) | n);
}

void
send_hello(FILE *cout)
{
	char hostname[HOST_NAME_MAX+1];

	if (gethostname(hostname, sizeof(hostname)) == -1)
		strlcpy(hostname, "unknown", sizeof hostname);
	fprintf(cout, "CDDB HELLO %s %s cdio " VERSION "\r\n",
	    getlogin(), hostname);
	fflush(cout);
}

void
send_query(FILE *f, int n, struct cd_toc_entry *e)
{
	int i;

	fprintf(f, "cddb query %8lx %d", cddb_discid(n, e), n);
	for (i = 0; i < n; i++)
		fprintf(f, " %lu", entry2frames(e+i));
	fprintf(f, " %lu\r\n", (entry2frames(e+n)-entry2frames(e)) /75);
}

#define MAXSIZE 256
char copy_buffer[MAXSIZE];

void
safe_copy(char **p, const char *title)
{
	strnvis(copy_buffer, title, MAXSIZE-1, VIS_TAB|VIS_NL);
	if (*p == NULL)
		*p = strdup(copy_buffer);
	else {
		char *n;

		if (asprintf(&n, "%s%s", *p, copy_buffer) == -1)
			return;
		free(*p);
		*p = n;
	}
}

int
further_query(FILE *cout, char *line)
{
	char *key;
	char *title;

	key = strchr(line, ' ');
	if (!key)
		return 0;
	*key++ = 0;
	title = strchr(key, ' ');
	if (!title)
		return 0;
	*title++ = 0;
	strnvis(copy_buffer, title, MAXSIZE-1, VIS_TAB|VIS_NL);
	printf("%s", copy_buffer);
	strnvis(copy_buffer, line, MAXSIZE-1, VIS_TAB|VIS_NL);
	printf("(%s)\n", copy_buffer);
	fprintf(cout, "CDDB READ %s %s\r\n", line, key);
	fflush(cout);
	return 1;
}


int
connect_to(const char *host, const char *serv)
{
	int s = -1;
	struct addrinfo hints, *res0 = NULL, *res;
	int error;

	memset(&hints, 0, sizeof hints);
	hints.ai_family = PF_UNSPEC;
	hints.ai_socktype = SOCK_STREAM;

	error = getaddrinfo(host, serv, &hints, &res0);
	if (error) {
		warnx("%s", gai_strerror(error));
		return -1;
	}

	for (res = res0; res; res = res->ai_next) {
		s = socket(res->ai_family, res->ai_socktype,
		    res->ai_protocol);
		if (s == -1)
			continue;
		if (connect(s, res->ai_addr, res->ai_addrlen) == -1) {
			close(s);
			s = -1;
			continue;
		}
		break;
	}
	if (s == -1)
		warn("cddb");
	freeaddrinfo(res0);
	return s;
}

int
parse_connect_to(const char *host_port, const char *port)
{
	int s;
	char *last, *host;

	host = (char *)host_port;

	last = strrchr(host_port, ':');
	if (last != 0 && !(last != host && last[-1] == ':')) {
		port = last + 1;
		host = malloc(last - host_port + 1);
		if (!host)
			return -1;
		memcpy(host, host_port, last-host_port);
		host[last-host_port] = 0;
	}
	s = connect_to(host, port);
	if (host != host_port)
		free(host);
	return s;
}

char *
get_line(FILE *cin)
{
	char *line;
	size_t len;

	line = fgetln(cin, &len);
	if (!line)
		return NULL;
	if (len == 0)
		return NULL;
	if (line[len-1] == '\n')
		line[--len] = 0;
	if (len != 0 && line[len-1] == '\r')
		line[--len] = 0;
	if (line[len] != 0)
		return NULL;
	return line;
}

char *
get_answer(FILE *cin)
{
	char *line;

	line = get_line(cin);
	if (!line || *line != '2')
		return NULL;
	else
		return line;
}

void
verify_track_names(char **names, int n, struct cd_toc_entry *e)
{
	int i;

	for (i = 0; i < n; i++) {
		if (names[i] == 0)
			names[i] = strdup(e->control & 4 ? "data" : "audio");
	}
}

char **
cddb(const char *host_port, int n, struct cd_toc_entry *e, char *arg)
{
	int s = -1;
	int s2 = -1;
	FILE *cin = NULL;
	FILE *cout = NULL;
	char *type;
	char *line;
	char **result = NULL;
	int i;
	const char *errstr;

	s = parse_connect_to(host_port, "cddb");
	if (s == -1)
		goto end;
	s2 = dup(s);
	if (s2 == -1)
		goto end;
	cin = fdopen(s, "r");
	if (!cin) {
		warn("cddb: fdopen");
		goto end;
	}
	s = -1;
	cout = fdopen(s2, "w");
	if (!cout) {
		warn("cddb: fdopen");
		goto end;
	}
	s2 = -1;
	line = get_answer(cin);
	if (!line) {
		warnx("cddb: won't talk to us");
		goto end;
	}

	send_hello(cout);
	line = get_answer(cin);
	if (!line) {
		warnx("cddb: problem in hello");
		goto end;
	}

	send_query(cout, n, e);
	fflush(cout);
	line = get_answer(cin);
	if (!line) {
		warnx("cddb: problem in query");
		goto end;
	}
	type = strchr(line, ' ');
	if (!type)
		goto end;
	*type++ = 0;
	/* no match or other issue */
	if (strcmp(line, "202") == 0) {
		printf("cddb: No match in database\n");
		goto end;
	}
	if (strcmp(line, "211") == 0 || strcmp(line, "212") == 0) {
		int number = strtonum(arg, 0, INT_MAX, &errstr);
		if (errstr != NULL && *arg != '\0') {
			warnx("cddb: invalid index");
			goto end;
		}
		if (number == 0) {
			if (strcmp(line, "211") == 0)
				printf("cddb: multiple matches\n");
			else {
				printf("cddb: inexact match\n");
				number = 1;
			}
		}
		if (number == 0) {
			for (i = 1;; i++) {
				line = get_line(cin);
				if (!line || strcmp(line, ".") == 0)
					goto end;
				printf("%d: %s\n", i, line);
			}
		} else {
			int ok = 0;

			for (i = 1;; i++) {
				line = get_line(cin);
				if (!line)
					break;
				if (strcmp(line, ".") == 0)
					break;
				if (i == number)
					ok = further_query(cout, line);
			}
			if (!ok)
				goto end;
		}
	} else if (strcmp(line, "200") != 0 || !further_query(cout, type))
		goto end;
	result = calloc(sizeof(char *), n + 1);
	if (!result)
		goto end;
	for (i = 0; i <= n; i++)
		result[i] = NULL;
	line = get_answer(cin);
	if (!line)
		goto end2;
	for (;;) {
		int k;
		char *end;

		line = get_line(cin);
		if (!line)
			goto end2;
		if (strcmp(line, ".") == 0)
			break;
		if (strncmp(line, "TTITLE", 6) != 0)
			continue;
		line += 6;
		end = strchr(line, '=');
		if (end == NULL)
			continue;
		*end++ = '\0';
		k = strtonum(line, 0, n - 1, &errstr);
		if (errstr != NULL)
			continue;
		safe_copy(&result[k], end);
	}
	fprintf(cout, "QUIT\r\n");
	verify_track_names(result, n, e);
	goto end;
end2:
	free(result);
	result = NULL;
end:
	if (cout)
		fclose(cout);
	if (cin)
		fclose(cin);
	if (s != -1)
		close(s);
	if (s2 != -1)
		close(s2);
	return result;
}

void
free_names(char **names)
{
	int i;

	for (i = 0; names[i]; i++)
		free(names[i]);
	free(names);
}