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Pull in patch from current (even more to come):
Fix (millert):
warnx?/errx? paranoia (use "%s" not a bare string unless it is a
constant).  These are not security holes but it is worth fixing
them anyway both for robustness and so folks looking for examples
in the tree are not misled into doing something potentially dangerous.
Furthermore, it is a bad idea to assume that pathnames will not
include '%' in them and that error routines don't return strings
with '%' in them (especially in light of the possibility of locales).

/*	$OpenBSD: names.c,v 1.10.2.1 2000/10/06 21:16:14 jason Exp $	*/
/*	$NetBSD: names.c,v 1.5 1996/06/08 19:48:32 christos Exp $	*/

/*
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)names.c	8.1 (Berkeley) 6/6/93";
#else
static char rcsid[] = "$OpenBSD: names.c,v 1.10.2.1 2000/10/06 21:16:14 jason Exp $";
#endif
#endif /* not lint */

/*
 * Mail -- a mail program
 *
 * Handle name lists.
 */

#include "rcv.h"
#include <fcntl.h>
#include "extern.h"

/*
 * Allocate a single element of a name list,
 * initialize its name field to the passed
 * name and return it.
 */
struct name *
nalloc(str, ntype)
	char str[];
	int ntype;
{
	struct name *np;

	np = (struct name *)salloc(sizeof(*np));
	np->n_flink = NIL;
	np->n_blink = NIL;
	np->n_type = ntype;
	np->n_name = savestr(str);
	return(np);
}

/*
 * Find the tail of a list and return it.
 */
struct name *
tailof(name)
	struct name *name;
{
	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(line, ntype)
	char line[];
	int ntype;
{
	char *cp;
	struct name *top, *np, *t;
	char *nbuf;

	if (line == NULL || *line == '\0')
		return(NIL);
	if ((nbuf = (char *)malloc(strlen(line) + 1)) == NULL)
		errx(1, "Out of memory");
	top = NIL;
	np = NIL;
	cp = line;
	while ((cp = yankword(cp, nbuf)) != NULL) {
		t = nalloc(nbuf, ntype);
		if (top == NIL)
			top = t;
		else
			np->n_flink = t;
		t->n_blink = np;
		np = t;
	}
	(void)free(nbuf);
	return(top);
}

/*
 * Turn a list of names into a string of the same names.
 */
char *
detract(np, ntype)
	struct name *np;
	int ntype;
{
	int s, comma;
	char *cp, *top;
	struct name *p;

	comma = ntype & GCOMMA;
	if (np == NIL)
		return(NULL);
	ntype &= ~GCOMMA;
	s = 0;
	if (debug && comma)
		fputs("detract asked to insert commas\n", stderr);
	for (p = np; p != NIL; p = p->n_flink) {
		if (ntype && (p->n_type & GMASK) != ntype)
			continue;
		s += strlen(p->n_name) + 1;
		if (comma)
			s++;
	}
	if (s == 0)
		return(NULL);
	s += 2;
	top = salloc(s);
	cp = top;
	for (p = np; p != NIL; p = p->n_flink) {
		if (ntype && (p->n_type & GMASK) != ntype)
			continue;
		cp = copy(p->n_name, cp);
		if (comma && p->n_flink != NIL)
			*cp++ = ',';
		*cp++ = ' ';
	}
	*--cp = 0;
	if (comma && *--cp == ',')
		*cp = 0;
	return(top);
}

/*
 * Grab a single word (liberal word)
 * Throw away things between ()'s, and take anything between <>.
 */
char *
yankword(ap, wbuf)
	char *ap, wbuf[];
{
	char *cp, *cp2;

	cp = ap;
	for (;;) {
		if (*cp == '\0')
			return(NULL);
		if (*cp == '(') {
			int nesting = 0;

			while (*cp != '\0') {
				switch (*cp++) {
				case '(':
					nesting++;
					break;
				case ')':
					--nesting;
					break;
				}
				if (nesting <= 0)
					break;
			}
		} else if (*cp == ' ' || *cp == '\t' || *cp == ',')
			cp++;
		else
			break;
	}
	if (*cp ==  '<')
		for (cp2 = wbuf; *cp && (*cp2++ = *cp++) != '>';)
			;
	else
		for (cp2 = wbuf; *cp && !strchr(" \t,(", *cp); *cp2++ = *cp++)
			;
	*cp2 = '\0';
	return(cp);
}

/*
 * For each recipient in the passed name list with a /
 * in the name, append the message to the end of the named file
 * and remove him from the recipient list.
 *
 * Recipients whose name begins with | are piped through the given
 * program and removed.
 */
struct name *
outof(names, fo, hp)
	struct name *names;
	FILE *fo;
	struct header *hp;
{
	int c, ispipe;
	struct name *np, *top;
	time_t now;
	char *date, *fname;
	FILE *fout, *fin;

	top = names;
	np = names;
	(void)time(&now);
	date = ctime(&now);
	while (np != NIL) {
		if (!isfileaddr(np->n_name) && np->n_name[0] != '|') {
			np = np->n_flink;
			continue;
		}
		ispipe = np->n_name[0] == '|';
		if (ispipe)
			fname = np->n_name+1;
		else
			fname = expand(np->n_name);

		/*
		 * See if we have copied the complete message out yet.
		 * If not, do so.
		 */

		if (image < 0) {
			int fd;
			char tempname[PATHSIZE];

			(void)snprintf(tempname, sizeof(tempname),
			    "%s/mail.ReXXXXXXXXXX", tmpdir);
			if ((fd = mkstemp(tempname)) == -1 ||
			    (fout = Fdopen(fd, "a")) == NULL) {
				warn("%s", tempname);
				senderr++;
				goto cant;
			}
			image = open(tempname, O_RDWR);
			(void)rm(tempname);
			if (image < 0) {
				warn("%s", tempname);
				senderr++;
				(void)Fclose(fout);
				goto cant;
			}
			(void)fcntl(image, F_SETFD, 1);
			fprintf(fout, "From %s %s", myname, date);
			puthead(hp, fout, GTO|GSUBJECT|GCC|GNL);
			while ((c = getc(fo)) != EOF)
				(void)putc(c, fout);
			rewind(fo);
			(void)putc('\n', fout);
			(void)fflush(fout);
			if (ferror(fout))
				warn("%s", tempname);
			(void)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) {
			int pid;
			char *shell;
			sigset_t nset;

			/*
			 * XXX
			 * We can't really reuse the same image file,
			 * because multiple piped recipients will
			 * share the same lseek location and trample
			 * on one another.
			 */
			if ((shell = value("SHELL")) == NULL)
				shell = _PATH_CSHELL;
			sigemptyset(&nset);
			sigaddset(&nset, SIGHUP);
			sigaddset(&nset, SIGINT);
			sigaddset(&nset, SIGQUIT);
			pid = start_command(shell, &nset,
				image, -1, "-c", fname, NULL);
			if (pid < 0) {
				senderr++;
				goto cant;
			}
			free_child(pid);
		} else {
			int f;
			if ((fout = Fopen(fname, "a")) == NULL) {
				warn("%s", fname);
				senderr++;
				goto cant;
			}
			if ((f = dup(image)) < 0) {
				warn("dup");
				fin = NULL;
			} else
				fin = Fdopen(f, "r");
			if (fin == NULL) {
				fputs("Can't reopen image\n", stderr);
				(void)Fclose(fout);
				senderr++;
				goto cant;
			}
			rewind(fin);
			while ((c = getc(fin)) != EOF)
				(void)putc(c, fout);
			if (ferror(fout)) {
				senderr++;
				warn("%s", fname);
			}
			(void)Fclose(fout);
			(void)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.
		 */
		np->n_type |= GDEL;
		np = np->n_flink;
	}
	if (image >= 0) {
		(void)close(image);
		image = -1;
	}
	return(top);
}

/*
 * 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 ./...
 */
int
isfileaddr(name)
	char *name;
{
	char *cp;

	if (*name == '+')
		return(1);
	for (cp = name; *cp; cp++) {
		if (*cp == '!' || *cp == '%' || *cp == '@')
			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(names)
	struct name *names;
{
	struct name *new, *np, *cp;
	struct grouphead *gh;
	int metoo;

	new = NIL;
	np = names;
	metoo = (value("metoo") != NULL);
	while (np != NIL) {
		if (np->n_name[0] == '\\') {
			cp = np->n_flink;
			new = put(new, np);
			np = cp;
			continue;
		}
		gh = findgroup(np->n_name);
		cp = np->n_flink;
		if (gh != NOGRP)
			new = gexpand(new, gh, metoo, np->n_type);
		else
			new = put(new, np);
		np = cp;
	}
	return(new);
}

/*
 * 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.
 */

struct name *
gexpand(nlist, gh, metoo, ntype)
	struct name *nlist;
	struct grouphead *gh;
	int metoo, ntype;
{
	struct group *gp;
	struct grouphead *ngh;
	struct name *np;
	static int depth;
	char *cp;

	if (depth > MAXEXP) {
		printf("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, 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 && strcmp(cp, myname) == 0)
			np->n_type |= GDEL;
skip:
		nlist = put(nlist, np);
	}
	depth--;
	return(nlist);
}

/*
 * Concatenate the two passed name lists, return the result.
 */
struct name *
cat(n1, n2)
	struct name *n1, *n2;
{
	struct name *tail;

	if (n1 == NIL)
		return(n2);
	if (n2 == NIL)
		return(n1);
	tail = tailof(n1);
	tail->n_flink = n2;
	n2->n_blink = tail;
	return(n1);
}

/*
 * Unpack the name list onto a vector of strings.
 * Return an error if the name list won't fit.
 */
char **
unpack(np)
	struct name *np;
{
	char **ap, **top;
	struct name *n;
	int t, extra, metoo, verbose;

	n = np;
	if ((t = count(n)) == 0)
		errx(1, "No names to unpack");
	/*
	 * Compute the number of extra arguments we will need.
	 * We need at least four extra -- one for "send-mail", one for the
	 * "-i" flag, one for the "--" to signal end of command line
	 * arguments, and one for the terminating 0 pointer.
	 */
	extra = 4;
	metoo = value("metoo") != NULL;
	if (metoo)
		extra++;
	verbose = value("verbose") != NULL;
	if (verbose)
		extra++;
	top = (char **)salloc((t + extra) * sizeof(*top));
	ap = top;
	*ap++ = "send-mail";
	*ap++ = "-i";
	if (metoo)
		*ap++ = "-m";
	if (verbose)
		*ap++ = "-v";
	*ap++ = "--";
	for (; n != NIL; n = n->n_flink)
		if ((n->n_type & GDEL) == 0)
			*ap++ = n->n_name;
	*ap = NULL;
	return(top);
}

/*
 * Remove all of the duplicates from the passed name list by
 * insertion sorting them, then checking for dups.
 * Return the head of the new list.
 */
struct name *
elide(names)
	struct name *names;
{
	struct name *np, *t, *new;
	struct name *x;

	if (names == NIL)
		return(NIL);
	new = names;
	np = names;
	np = np->n_flink;
	if (np != NIL)
		np->n_blink = NIL;
	new->n_flink = NIL;
	while (np != NIL) {
		t = new;
		while (strcasecmp(t->n_name, np->n_name) < 0) {
			if (t->n_flink == NIL)
				break;
			t = t->n_flink;
		}

		/*
		 * If we ran out of t's, put the new entry after
		 * the current value of t.
		 */

		if (strcasecmp(t->n_name, np->n_name) < 0) {
			t->n_flink = np;
			np->n_blink = t;
			t = np;
			np = np->n_flink;
			t->n_flink = NIL;
			continue;
		}

		/*
		 * Otherwise, put the new entry in front of the
		 * current t.  If at the front of the list,
		 * the new guy becomes the new head of the list.
		 */

		if (t == new) {
			t = np;
			np = np->n_flink;
			t->n_flink = new;
			new->n_blink = t;
			t->n_blink = NIL;
			new = t;
			continue;
		}

		/*
		 * The normal case -- we are inserting into the
		 * middle of the list.
		 */

		x = np;
		np = np->n_flink;
		x->n_flink = t;
		x->n_blink = t->n_blink;
		t->n_blink->n_flink = x;
		t->n_blink = x;
	}

	/*
	 * Now the list headed up by new is sorted.
	 * Go through it and remove duplicates.
	 */

	np = new;
	while (np != NIL) {
		t = np;
		while (t->n_flink != NIL &&
		       strcasecmp(np->n_name, t->n_flink->n_name) == 0)
			t = t->n_flink;
		if (t == np || t == NIL) {
			np = np->n_flink;
			continue;
		}
		
		/*
		 * Now t points to the last entry with the same name
		 * as np.  Make np point beyond t.
		 */

		np->n_flink = t->n_flink;
		if (t->n_flink != NIL)
			t->n_flink->n_blink = np;
		np = np->n_flink;
	}
	return(new);
}

/*
 * Put another node onto a list of names and return
 * the list.
 */
struct name *
put(list, node)
	struct name *list, *node;
{
	node->n_flink = list;
	node->n_blink = NIL;
	if (list != NIL)
		list->n_blink = node;
	return(node);
}

/*
 * Determine the number of undeleted elements in
 * a name list and return it.
 */
int
count(np)
	struct name *np;
{
	int c;

	for (c = 0; np != NIL; np = np->n_flink)
		if ((np->n_type & GDEL) == 0)
			c++;
	return(c);
}

/*
 * Delete the given name from a namelist.
 */
struct name *
delname(np, name)
	struct name *np;
	char name[];
{
	struct name *p;

	for (p = np; p != NIL; p = p->n_flink)
		if (strcasecmp(p->n_name, name) == 0) {
			if (p->n_blink == NIL) {
				if (p->n_flink != NIL)
					p->n_flink->n_blink = NIL;
				np = p->n_flink;
				continue;
			}
			if (p->n_flink == NIL) {
				if (p->n_blink != NIL)
					p->n_blink->n_flink = NIL;
				continue;
			}
			p->n_blink->n_flink = p->n_flink;
			p->n_flink->n_blink = p->n_blink;
		}
	return(np);
}

/*
 * Pretty print a name list
 * Uncomment it if you need it.
 */

/*
void
prettyprint(name)
	struct name *name;
{
	struct name *np;

	np = name;
	while (np != NIL) {
		fprintf(stderr, "%s(%d) ", np->n_name, np->n_type);
		np = np->n_flink;
	}
	putc('\n', stderr);
}
*/