/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License, Version 1.0 only

 * (the "License").  You may not use this file except in compliance

 * with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2001 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/

/*	  All Rights Reserved  	*/

/*

 * University Copyright- Copyright (c) 1982, 1986, 1988

 * The Regents of the University of California

 * All Rights Reserved

 *

 * University Acknowledgment- Portions of this document are derived from

 * software developed by the University of California, Berkeley, and its

 * contributors.

 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

/*

 * mailx -- a modified version of a University of California at Berkeley

 *	mail program

 *

 * Handle name lists.

 */

#include "rcv.h"

#include <locale.h>

static struct name	*nalloc(char str[]);

static int		isfileaddr(char *name);

static int		lengthof(struct name *name);

static struct name	*gexpand(struct name *nlist, struct grouphead *gh, int metoo, int arg_ntype);

static char		*norm(register char *user, register char *ubuf, int nbangs);

static struct name	*put(struct name *list, struct name *node);

/*

 * Allocate a single element of a name list,

 * initialize its name field to the passed

 * name and return it.

 */

static struct name *

nalloc(char str[])

{

	register struct name *np;

	np = (struct name *) salloc(sizeof *np);

	np->n_flink = NIL;

	np->n_blink = NIL;

	np->n_type = -1;

	np->n_full = savestr(str);

	np->n_name = skin(np->n_full);

	return(np);

}

/*

 * Find the tail of a list and return it.

 */

struct name *

tailof(struct name *name)

{

	register struct name *np;

	np = name;

	if (np == NIL)

		return(NIL);

	while (np->n_flink != NIL)

		np = np->n_flink;

	return(np);

}

/*

 * Extract a list of names from a line,

 * and make a list of names from it.

 * Return the list or NIL if none found.

 */

struct name *

extract(char line[], int arg_ntype)

{

	short ntype = (short)arg_ntype;

	register char *cp;

	register struct name *top, *np, *t;

	char nbuf[BUFSIZ], abuf[BUFSIZ];

	int comma;

	if (line == NOSTR || strlen(line) == 0)

		return(NIL);

	comma = docomma(line);

	top = NIL;

	np = NIL;

	cp = line;

	while ((cp = yankword(cp, nbuf, sizeof (nbuf), comma)) != NOSTR) {

		if (np != NIL && equal(nbuf, "at")) {

			nstrcpy(abuf, sizeof (abuf), nbuf);

			if ((cp = yankword(cp, nbuf, sizeof (nbuf),

				comma)) == NOSTR) {

				nstrcpy(nbuf, sizeof (nbuf), abuf);

				goto normal;

			}

			snprintf(abuf, sizeof (abuf), "%s@%s", np->n_name,

				nbuf); 

			np->n_name = savestr(abuf);

			continue;

		}

normal:

		t = nalloc(nbuf);

		t->n_type = ntype;

		if (top == NIL)

			top = t;

		else

			np->n_flink = t;

		t->n_blink = np;

		np = t;

	}

	return(top);

}

/*

 * Turn a list of names into a string of the same names.

 */

char *

detract(register struct name *np, int ntype)

{

	register int s;

	register char *cp, *top;

	register struct name *p;

	if (np == NIL)

		return(NOSTR);

	s = 0;

	for (p = np; p != NIL; p = p->n_flink) {

		if ((ntype && (p->n_type & GMASK) != ntype)

		 || (p->n_type & GDEL))

			continue;

		s += strlen(p->n_full) + 2;

	}

	if (s == 0)

		return(NOSTR);

	top = (char *)salloc((unsigned)(++s));

	cp = top;

	for (p = np; p != NIL; p = p->n_flink) {

		if ((ntype && (p->n_type & GMASK) != ntype)

		 || (p->n_type & GDEL))

			continue;

		cp = copy(p->n_full, cp);

		*cp++ = ',';

		*cp++ = ' ';

	}

	*cp = 0;

	return(top);

}

struct name *

outpre(struct name *to)

{

	register struct name *np;

	for (np = to; np; np = np->n_flink)

		if (isfileaddr(np->n_name))

			np->n_type |= GDEL;

	return to;

}

/*

 * For each recipient in the passed name list with a /

 * in the name, append the message to the end of the named file

 *

 * Recipients whose name begins with | are piped through the given

 * program and removed.

 */

int

outof(struct name *names, FILE *fo)

{

	register int c;

	register struct name *np;

	time_t now;

	char *date, *fname, *shell;

	FILE *fout, *fin;

	int ispipe;

	int nout = 0;

	int fd = 0; 

#ifdef preSVr4

	char line[BUFSIZ];

#endif

	for (np = names; np != NIL; np = np->n_flink) {

		if (!isfileaddr(np->n_name) && np->n_name[0] != '|')

			continue;

		nout++;

		ispipe = np->n_name[0] == '|';

		if (ispipe)

			fname = np->n_name+1;

		else

			fname = safeexpand(np->n_name);

		/*

		 * See if we have copied the complete message out yet.

		 * If not, do so.

		 */

		if (image < 0) {

			fd = open(tempEdit, O_CREAT|O_EXCL|O_APPEND|O_WRONLY,

					0600);

			if ((fd  < 0) && (errno == EEXIST)) {

				if ((fd = open(tempEdit, O_APPEND|O_WRONLY,

						0600)) < 0) {

					perror(tempEdit);

					senderr++;

					goto cant;

				}

			}

			if ((fout = fdopen(fd, "a")) == NULL) {

				perror(tempEdit);

				senderr++;

				goto cant;

			}

			image = open(tempEdit, O_RDWR);

			unlink(tempEdit);

			if (image < 0) {

				perror(tempEdit);

				senderr++;

				goto cant;

			} else {

				rewind(fo);

				time(&now);

				date = ctime(&now);

				fprintf(fout, "From %s %s", myname, date);

				while ((c = getc(fo)) != EOF)

					putc(c, fout);

				rewind(fo);

				fflush(fout);

				if (fferror(fout))

					perror(tempEdit);

				fclose(fout);

			}

		}

		/*

		 * Now either copy "image" to the desired file

		 * or give it as the standard input to the desired

		 * program as appropriate.

		 */

		if (ispipe) {

			wait((int *)NULL);

			switch (fork()) {

			case 0:

				sigchild();

				sigset(SIGHUP, SIG_IGN);

				sigset(SIGINT, SIG_IGN);

				sigset(SIGQUIT, SIG_IGN);

				close(0);

				dup(image);

				close(image);

				lseek(0, 0L, 0);

				if ((shell = value("SHELL")) == NOSTR || *shell=='\0')

					shell = SHELL;

				(void) execlp(shell, shell, "-c", fname, (char *)0);

				perror(shell);

				exit(1);

				break;

			case (pid_t)-1:

				perror("fork");

				senderr++;

				goto cant;

			}

		}

		else {

			if ((fout = fopen(fname, "a")) == NULL) {

				perror(fname);

				senderr++;

				goto cant;

			}

			fin = Fdopen(image, "r");

			if (fin == NULL) {

				fprintf(stderr,

				    gettext("Can't reopen image\n"));

				fclose(fout);

				senderr++;

				goto cant;

			}

			rewind(fin);

#ifdef preSVr4

			putc(getc(fin), fout);

			while (fgets(line, sizeof line, fin)) {

				if (!strncmp(line, "From ", 5))

					putc('>', fout);

				fputs(line, fout);

			}

#else

			while ((c = getc(fin)) != EOF)

				putc(c, fout);

#endif

			putc('\n', fout);

			fflush(fout);

			if (fferror(fout))

				senderr++, perror(fname);

			fclose(fout);

			fclose(fin);

		}

cant:

		/*

		 * In days of old we removed the entry from the

		 * the list; now for sake of header expansion

		 * we leave it in and mark it as deleted.

		 */

#ifdef CRAZYWOW

		{

		register struct name *t, *x;

		if (np == top) {

			top = np->n_flink;

			if (top != NIL)

				top->n_blink = NIL;

			np = top;

			continue;

		}

		x = np->n_blink;

		t = np->n_flink;

		x->n_flink = t;

		if (t != NIL)

			t->n_blink = x;

		np = t;

		}

#endif

		np->n_type |= GDEL;

	}

	if (image >= 0) {

		close(image);

		image = -1;

	}

	return(nout);

}

/*

 * Determine if the passed address is a local "send to file" address.

 * If any of the network metacharacters precedes any slashes, it can't

 * be a filename.  We cheat with .'s to allow path names like ./...

 * If "fcc" has been unset, then short-circuit those tests, but not

 * the +... test.

 */

static int 

isfileaddr(char *name)

{

	register char *cp;

	char *fcc = value("fcc");

	if (any('@', name))

		return(0);

	if (*name == '+')

		return(1);

	if (fcc == NOSTR)

		return(0);

	for (cp = name; *cp; cp++) {

		if (*cp == '.')

			continue;

		if (any(*cp, metanet))

			return(0);

		if (*cp == '/')

			return(1);

	}

	return(0);

}

/*

 * Map all of the aliased users in the invoker's mailrc

 * file and insert them into the list.

 * Changed after all these months of service to recursively

 * expand names (2/14/80).

 */

struct name *

usermap(struct name *names)

{

	register struct name *newnames, *np, *cp;

	struct grouphead *gh;

	register int metoo;

	newnames = NIL;

	np = names;

	metoo = (value("metoo") != NOSTR);

	while (np != NIL) {

		if (np->n_name[0] == '\\') {

			cp = np->n_flink;

			newnames = put(newnames, np);

			np = cp;

			continue;

		}

		gh = findgroup(np->n_name);

		cp = np->n_flink;

		if (gh != NOGRP)

			newnames = gexpand(newnames, gh, metoo, np->n_type);

		else

			newnames = put(newnames, np);

		np = cp;

	}

	return(newnames);

}

/*

 * Recursively expand a group name.  We limit the expansion to some

 * fixed level to keep things from going haywire.

 * Direct recursion is not expanded for convenience.

 */

static struct name *

gexpand(struct name *nlist, struct grouphead *gh, int metoo, int arg_ntype)

{

	short ntype = (short)arg_ntype;

	struct mgroup *gp;

	struct grouphead *ngh;

	struct name *np;

	static int depth;

	register char *cp;

	if (depth > MAXEXP) {

		printf(gettext("Expanding alias to depth larger than %d\n"),

		    MAXEXP);

		return(nlist);

	}

	depth++;

	for (gp = gh->g_list; gp != NOGE; gp = gp->ge_link) {

		cp = gp->ge_name;

		if (*cp == '\\')

			goto quote;

		if (strcmp(cp, gh->g_name) == 0)

			goto quote;

		if ((ngh = findgroup(cp)) != NOGRP) {

			nlist = gexpand(nlist, ngh, metoo, ntype);

			continue;

		}

quote:

		np = nalloc(cp);

		np->n_type = ntype;

		/*

		 * At this point should allow to expand

		 * to self if only person in group

		 */

		if (gp == gh->g_list && gp->ge_link == NOGE)

			goto skip;

		if (!metoo && samebody(myname, gp->ge_name, FALSE))

			np->n_type |= GDEL;

skip:

		nlist = put(nlist, np);

	}

	depth--;

	return(nlist);

}

/*

 * Normalize a network name for comparison purposes.

 */

static char *

norm(register char *user, register char *ubuf, int nbangs)

{

	register char *cp;

	int inubuf = 0;

	while (*user++ == '!');

	user--;

	if (!strchr(user, '!')) {

		snprintf(ubuf, BUFSIZ, "%s!%s", host, user);

		user = ubuf;

		inubuf++;

	}

	if (nbangs) {

		cp = user + strlen(user);

		while (nbangs--)

			while (cp > user && *--cp != '!');

		user = (cp > user) ? ++cp : cp;

		/*

		 * Now strip off all Internet-type

		 * hosts.

		 */

		if ((cp = strchr(user, '%')) == NOSTR)

			cp = strchr(user, '@');

		if (cp != NOSTR) {

			if (!inubuf) {

				strncpy(ubuf, user, cp - user);

				ubuf[cp - user] = '\0';

				user = ubuf;

			} else

				*cp = '\0';

		}

	}

	return user;

}

/*

 * Implement allnet options.

 */

int 

samebody(register char *user, register char *addr, int fuzzy)