/*	$OpenBSD: mknetid.c,v 1.22 2015/02/09 23:00:15 deraadt Exp $ */

/*
 * Copyright (c) 1996 Mats O Jansson <moj@stacken.kth.se>
 * 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.
 */

#include <stdio.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <pwd.h>
#include <grp.h>
#include <err.h>
#include <netdb.h>
#include <limits.h>

#include <rpcsvc/ypclnt.h>

struct user {
	char	*usr_name;		/* user name */
	int	usr_uid;		/* user uid */
	int	usr_gid;		/* user gid */
	int	gid_count;		/* number of gids */
	int	gid[NGROUPS_MAX];	/* additional gids */
	struct user *prev, *next;	/* links in read order */
	struct user *hprev, *hnext;	/* links in hash order */
};

char *HostFile = _PATH_HOSTS;
char *PasswdFile = _PATH_PASSWD;
char *MasterPasswdFile = _PATH_MASTERPASSWD;
char *GroupFile = _PATH_GROUP;
char *NetidFile = "/etc/netid";

#define HASHMAX 55

struct user *root = NULL, *tail = NULL;
struct user *hroot[HASHMAX], *htail[HASHMAX];

static int
read_line(FILE *fp, char *buf, int size)
{
	int done = 0;

	do {
		while (fgets(buf, size, fp)) {
			int len = strlen(buf);

			done += len;
			if (len > 1 && buf[len-2] == '\\' &&
			    buf[len-1] == '\n') {
				int ch;

				buf += len - 2;
				size -= len - 2;
				*buf = '\n'; buf[1] = '\0';

				/*
				 * Skip leading white space on next line
				 */
				while ((ch = getc(fp)) != EOF &&
				    isascii(ch) && isspace(ch))
					;
				(void) ungetc(ch, fp);
			} else {
				return done;
			}
		}
	} while (size > 0 && !feof(fp));

	return done;
}

static int
hashidx(char key)
{
	if (key < 'A')
		return (0);
	if (key <= 'Z')
		return (1 + key - 'A');
	if (key < 'a')
		return (27);
	if (key <= 'z')
		return (28 + key - 'a');
	return (54);
}

static void
add_user(char *username, char *uid, char *gid)
{
	struct user *u;
	int idx;

	u = malloc(sizeof(struct user));
	if (u == NULL)
		err(1, "malloc");
	bzero(u, sizeof(struct user));
	u->usr_name = strdup(username);
	if (u->usr_name == NULL)
		err(1, "strdup");
	u->usr_uid = atoi(uid);
	u->usr_gid = atoi(gid);
	u->gid_count = -1;
	if (root == NULL) {
		root = tail = u;
	} else {
		u->prev = tail;
		tail->next = u;
		tail = u;
	}
	idx = hashidx(username[0]);
	if (hroot[idx] == NULL) {
		hroot[idx] = htail[idx] = u;
	} else {
		u->hprev = htail[idx];
		htail[idx]->hnext = u;
		htail[idx] = u;
	}
}

static void
add_group(char *username, char *gid)
{
	struct user *u;
	int idx, g;

	idx = hashidx(username[0]);
	u = hroot[idx];
	g = atoi(gid);

	while (u != NULL) {
		if (strcmp(username, u->usr_name) == 0) {
			if (g != u->usr_gid) {
				u->gid_count++;
				if (u->gid_count < NGROUPS_MAX)
					u->gid[u->gid_count] = atoi(gid);
			}
			u = htail[idx];
		}
		u = u->hnext;
	}
}

static void
read_passwd(FILE *pfile, char *fname)
{
	char  line[1024], *p, *k, *u, *g;
	int   line_no = 0, len, colon;

	while (read_line(pfile, line, sizeof(line))) {
		line_no++;
		len = strlen(line);

		if (len > 0) {
			if (line[0] == '#')
				continue;
		}

		/*
		 * Check if we have the whole line
		 */
		if (line[len-1] != '\n') {
			fprintf(stderr, "line %d in \"%s\" is too long\n",
			    line_no, fname);
		} else {
			line[len-1] = '\0';
		}

		p = (char *)&line;

		k = p; colon = 0;
		while (*k != '\0') {
			if (*k == ':')
				colon++;
			k++;
		}

		if (colon > 0) {
			k = p;			/* save start of key  */
			while (*p != ':')
				p++;		/* find first "colon" */
			if (*p==':')
				*p++ = '\0';	/* terminate key */
			if (strlen(k) == 1) {
				if (*k == '+')
					continue;
			}
		}

		if (colon < 4) {
			fprintf(stderr, "syntax error at line %d in \"%s\"\n",
			    line_no, fname);
			continue;
		}

		while (*p != ':')
			p++;			/* find second "colon" */
		if (*p==':')
			*p++ = '\0';		/* terminate passwd */
		u = p;
		while (*p != ':')
			p++;			/* find third "colon" */
		if (*p==':')
			*p++ = '\0';		/* terminate uid */
		g = p;
		while (*p != ':')
			p++;			/* find fourth "colon" */
		if (*p==':')
			*p++ = '\0';		/* terminate gid */
		while (*p != '\0')
			p++;	/* find end of string */

		add_user(k, u, g);
	}
}

static int
isgsep(char ch)
{
	switch (ch)  {
	case ',':
	case ' ':
	case '\t':
	case '\0':
		return (1);
	default:
		return (0);
	}
}

static void
read_group(FILE *gfile, char *fname)
{
	char  line[2048], *p, *k, *u, *g;
	int   line_no = 0, len, colon;

	while (read_line(gfile, line, sizeof(line))) {
		line_no++;
		len = strlen(line);

		if (len > 0) {
			if (line[0] == '#')
				continue;
		}

		/*
		 * Check if we have the whole line
		 */
		if (line[len-1] != '\n') {
			fprintf(stderr, "line %d in \"%s\" is too long\n",
			    line_no, fname);
		} else {
			line[len-1] = '\0';
		}

		p = (char *)&line;

		k = p; colon = 0;
		while (*k != '\0') {
			if (*k == ':')
				colon++;
			k++;
		}

		if (colon > 0) {
			k = p;			/* save start of key  */
			while (*p != ':')
				p++;		/* find first "colon" */
			if (*p==':')
				*p++ = '\0';	/* terminate key */
			if (strlen(k) == 1) {
				if (*k == '+')
					continue;
			}
		}

		if (colon < 3) {
			fprintf(stderr, "syntax error at line %d in \"%s\"\n",
			    line_no, fname);
			continue;
		}

		while (*p != ':')
			p++;			/* find second "colon" */
		if (*p==':')
			*p++ = '\0';		/* terminate passwd */
		g = p;
		while (*p != ':')
			p++;			/* find third "colon" */
		if (*p==':')
			*p++ = '\0';		/* terminate gid */

		u = p;

		while (*u != '\0') {
			while (!isgsep(*p))
				p++;		/* find separator */
			if (*p != '\0') {
				*p = '\0';
				if (u != p)
					add_group(u, g);
				p++;
			} else {
				if (u != p)
					add_group(u, g);
			}
			u = p;
		}
	}
}

static void
print_passwd_group(int qflag, char *domain)
{
	struct user *u, *p;
	int i;

	u = root;

	while (u != NULL) {
		p = root;
		while (p->usr_uid != u->usr_uid)
			p = p->next;

		if (p != u) {
			if (!qflag) {
				fprintf(stderr, "mknetid: unix.%d@%s %s\n",
				    u->usr_uid, domain,
				    "multiply defined, other definitions ignored");
			}
		} else {
			printf("unix.%d@%s %d:%d",
			    u->usr_uid, domain, u->usr_uid, u->usr_gid);
			if (u->gid_count >= 0) {
				i = 0;
				while (i <= u->gid_count) {
					printf(",%d", u->gid[i]);
					i++;
				}
			}
			printf("\n");
		}
		u = u->next;
	}
}

static void
print_hosts(FILE *pfile, char *fname, char *domain)
{
	char  line[1024], *p, *u;
	int   line_no = 0, len;

	while (read_line(pfile, line, sizeof(line))) {
		line_no++;
		len = strlen(line);

		if (len > 0) {
			if (line[0] == '#')
				continue;
		}

		/*
		 * Check if we have the whole line
		 */
		if (line[len-1] != '\n') {
			fprintf(stderr, "line %d in \"%s\" is too long\n",
			    line_no, fname);
		} else {
			line[len-1] = '\0';
		}

		p = (char *)&line;

		while (!isspace((unsigned char)*p))
			p++;			/* find first "space" */
		while (isspace((unsigned char)*p))
			*p++ = '\0';		/* replace space with <NUL> */

		u = p;
		while (p != NULL) {
			if (*p == '\0') {
				p = NULL;
			} else {
				if (!isspace((unsigned char)*p)) {
					p++;
				} else {
					*p = '\0';
					p = NULL;
				}
			}
		}

		printf("unix.%s@%s 0:%s\n", u, domain, u);
	}
}

static void
print_netid(FILE *mfile, char *fname)
{
	char  line[1024], *p, *k, *u;
	int   line_no = 0, len;

	while (read_line(mfile, line, sizeof(line))) {
		line_no++;
		len = strlen(line);

		if (len > 0) {
			if (line[0] == '#')
				continue;
		}

		/*
		 * Check if we have the whole line
		 */
		if (line[len-1] != '\n') {
			fprintf(stderr, "line %d in \"%s\" is too long\n",
			    line_no, fname);
		} else {
			line[len-1] = '\0';
		}

		p = (char *)&line;

		k = p;				/* save start of key  */
		while (!isspace((unsigned char)*p))
			p++;			/* find first "space" */
		while (isspace((unsigned char)*p))
			*p++ = '\0';		/* replace space with <NUL> */

		u = p;
		while (p != NULL) {
			if (*p == '\0') {
				p = NULL;
			} else {
				if (!isspace((unsigned char)*p)) {
					p++;
				} else {
					*p = '\0';
					p = NULL;
				}
			}
		}

		printf("%s %s\n", k, u);
	}
}

static void
usage(void)
{
	fprintf(stderr, "usage: mknetid [-q] [-d domain] [-g groupfile] "
	    "[-h hostfile] [-m netidfile]\n"
	    "               [-P master.passwdfile] [-p passwdfile]\n");
	exit(1);
}

int
main(int argc, char *argv[])
{
	FILE   *pfile, *gfile, *hfile, *mfile;
	int	qflag = 0, ch;
	char   *domain = NULL;

	while ((ch = getopt(argc, argv, "d:g:h:m:p:P:q")) != -1)
		switch (ch) {
		case 'd':
			domain = optarg;
			break;
		case 'g':
			GroupFile = optarg;
			break;
		case 'h':
			HostFile = optarg;
			break;
		case 'm':
			NetidFile = optarg;
			break;
		case 'p':
			PasswdFile = optarg;
			break;
		case 'P':
			MasterPasswdFile = optarg;
			break;
		case 'q':
			qflag = 1;
			break;
		default:
			usage();
			break;
		}

	if (argc > optind)
		usage();

	if (domain == NULL)
		yp_get_default_domain(&domain);

	pfile = fopen(PasswdFile, "r");
	if (pfile == NULL)
		pfile = fopen(MasterPasswdFile, "r");
	if (pfile == NULL)
		err(1, "%s", MasterPasswdFile);

	gfile = fopen(GroupFile, "r");
	if (gfile == NULL)
		err(1, "%s", GroupFile);

	hfile = fopen(HostFile, "r");
	if (hfile == NULL)
		err(1, "%s", HostFile);

	mfile = fopen(NetidFile, "r");

	read_passwd(pfile, PasswdFile);
	read_group(gfile, GroupFile);

	print_passwd_group(qflag, domain);
	print_hosts(hfile, HostFile, domain);

	if (mfile != NULL)
		print_netid(mfile, NetidFile);

	return 0;
}