freebsd-dev/usr.bin/mail/names.c

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
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* 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. Neither the name of the University nor the names of its contributors
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* 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
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static char sccsid[] = "@(#)names.c 8.1 (Berkeley) 6/6/93";
#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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/*
* 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 *
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nalloc(char str[], int ntype)
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{
struct name *np;
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np = (struct name *)salloc(sizeof(*np));
np->n_flink = NULL;
np->n_blink = NULL;
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np->n_type = ntype;
np->n_name = savestr(str);
return (np);
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}
/*
* Find the tail of a list and return it.
*/
struct name *
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tailof(struct name *name)
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{
struct name *np;
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np = name;
if (np == NULL)
return (NULL);
while (np->n_flink != NULL)
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np = np->n_flink;
return (np);
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}
/*
* Extract a list of names from a line,
* and make a list of names from it.
* Return the list or NULL if none found.
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*/
struct name *
extract(char *line, int ntype)
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{
char *cp, *nbuf;
struct name *top, *np, *t;
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if (line == NULL || *line == '\0')
return (NULL);
if ((nbuf = malloc(strlen(line) + 1)) == NULL)
err(1, "Out of memory");
top = NULL;
np = NULL;
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cp = line;
while ((cp = yankword(cp, nbuf)) != NULL) {
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t = nalloc(nbuf, ntype);
if (top == NULL)
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top = t;
else
np->n_flink = t;
t->n_blink = np;
np = t;
}
(void)free(nbuf);
return (top);
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}
/*
* Turn a list of names into a string of the same names.
*/
char *
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detract(struct name *np, int ntype)
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{
int s, comma;
char *cp, *top;
struct name *p;
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comma = ntype & GCOMMA;
if (np == NULL)
return (NULL);
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ntype &= ~GCOMMA;
s = 0;
if (debug && comma)
fprintf(stderr, "detract asked to insert commas\n");
for (p = np; p != NULL; p = p->n_flink) {
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if (ntype && (p->n_type & GMASK) != ntype)
continue;
s += strlen(p->n_name) + 1;
if (comma)
s++;
}
if (s == 0)
return (NULL);
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s += 2;
top = salloc(s);
cp = top;
for (p = np; p != NULL; p = p->n_flink) {
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if (ntype && (p->n_type & GMASK) != ntype)
continue;
cp += strlcpy(cp, p->n_name, strlen(p->n_name) + 1);
if (comma && p->n_flink != NULL)
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*cp++ = ',';
*cp++ = ' ';
}
*--cp = '\0';
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if (comma && *--cp == ',')
*cp = '\0';
return (top);
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}
/*
* Grab a single word (liberal word)
* Throw away things between ()'s, and take anything between <>.
*/
char *
yankword(char *ap, char *wbuf)
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{
char *cp, *cp2;
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cp = ap;
for (;;) {
if (*cp == '\0')
return (NULL);
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if (*cp == '(') {
int nesting = 0;
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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 != '\0' && strchr(" \t,(", *cp) == NULL;
*cp2++ = *cp++)
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;
*cp2 = '\0';
return (cp);
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}
/*
* Grab a single login name (liberal word)
* Throw away things between ()'s, take anything between <>,
* and look for words before metacharacters %, @, !.
*/
char *
yanklogin(char *ap, char *wbuf)
{
char *cp, *cp2, *cp_temp;
int n;
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;
}
/*
* Now, let's go forward till we meet the needed character,
* and step one word back.
*/
/* First, remember current point. */
cp_temp = cp;
n = 0;
/*
* Note that we look ahead in a cycle. This is safe, since
* non-end of string is checked first.
*/
while(*cp != '\0' && strchr("@%!", *(cp + 1)) == NULL)
cp++;
/*
* Now, start stepping back to the first non-word character,
* while counting the number of symbols in a word.
*/
while(cp != cp_temp && strchr(" \t,<>", *(cp - 1)) == NULL) {
n++;
cp--;
}
/* Finally, grab the word forward. */
cp2 = wbuf;
while(n >= 0) {
*cp2++=*cp++;
n--;
}
*cp2 = '\0';
return (cp);
}
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/*
* 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 *
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outof(struct name *names, FILE *fo, struct header *hp)
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{
int c, ispipe;
struct name *np, *top;
time_t now;
char *date, *fname;
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FILE *fout, *fin;
top = names;
np = names;
(void)time(&now);
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date = ctime(&now);
while (np != NULL) {
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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);
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senderr++;
goto cant;
}
image = open(tempname, O_RDWR);
(void)rm(tempname);
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if (image < 0) {
warn("%s", tempname);
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senderr++;
(void)Fclose(fout);
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goto cant;
}
(void)fcntl(image, F_SETFD, 1);
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fprintf(fout, "From %s %s", myname, date);
puthead(hp, fout,
GTO|GSUBJECT|GCC|GREPLYTO|GINREPLYTO|GNL);
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while ((c = getc(fo)) != EOF)
(void)putc(c, fout);
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rewind(fo);
fprintf(fout, "\n");
(void)fflush(fout);
if (ferror(fout)) {
warn("%s", tempname);
senderr++;
(void)Fclose(fout);
goto cant;
}
(void)Fclose(fout);
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}
/*
* 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 *sh;
sigset_t nset;
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/*
* 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 ((sh = value("SHELL")) == NULL)
sh = _PATH_CSHELL;
(void)sigemptyset(&nset);
(void)sigaddset(&nset, SIGHUP);
(void)sigaddset(&nset, SIGINT);
(void)sigaddset(&nset, SIGQUIT);
pid = start_command(sh, &nset, image, -1, "-c", fname,
NULL);
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if (pid < 0) {
senderr++;
goto cant;
}
free_child(pid);
} else {
int f;
if ((fout = Fopen(fname, "a")) == NULL) {
warn("%s", fname);
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senderr++;
goto cant;
}
if ((f = dup(image)) < 0) {
warn("dup");
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fin = NULL;
} else
fin = Fdopen(f, "r");
if (fin == NULL) {
fprintf(stderr, "Can't reopen image\n");
(void)Fclose(fout);
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senderr++;
goto cant;
}
rewind(fin);
while ((c = getc(fin)) != EOF)
(void)putc(c, fout);
if (ferror(fout)) {
warnx("%s", fname);
senderr++;
(void)Fclose(fout);
(void)Fclose(fin);
goto cant;
}
(void)Fclose(fout);
(void)Fclose(fin);
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}
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);
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image = -1;
}
return (top);
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}
/*
* 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
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isfileaddr(char *name)
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{
char *cp;
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if (*name == '+')
return (1);
for (cp = name; *cp != '\0'; cp++) {
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if (*cp == '!' || *cp == '%' || *cp == '@')
return (0);
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if (*cp == '/')
return (1);
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}
return (0);
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}
/*
* 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 *
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usermap(struct name *names)
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{
struct name *new, *np, *cp;
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struct grouphead *gh;
int metoo;
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new = NULL;
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np = names;
metoo = (value("metoo") != NULL);
while (np != NULL) {
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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 != NULL)
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new = gexpand(new, gh, metoo, np->n_type);
else
new = put(new, np);
np = cp;
}
return (new);
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}
/*
* 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 *
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gexpand(struct name *nlist, struct grouphead *gh, int metoo, int ntype)
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{
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);
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}
depth++;
for (gp = gh->g_list; gp != NULL; gp = gp->ge_link) {
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cp = gp->ge_name;
if (*cp == '\\')
goto quote;
if (strcmp(cp, gh->g_name) == 0)
goto quote;
if ((ngh = findgroup(cp)) != NULL) {
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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 == NULL)
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goto skip;
if (!metoo && strcmp(cp, myname) == 0)
np->n_type |= GDEL;
skip:
nlist = put(nlist, np);
}
depth--;
return (nlist);
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}
/*
* Concatenate the two passed name lists, return the result.
*/
struct name *
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cat(struct name *n1, struct name *n2)
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{
struct name *tail;
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if (n1 == NULL)
return (n2);
if (n2 == NULL)
return (n1);
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tail = tailof(n1);
tail->n_flink = n2;
n2->n_blink = tail;
return (n1);
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}
/*
* Unpack the name list onto a vector of strings.
* Return an error if the name list won't fit.
*/
char **
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unpack(struct name *np)
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{
char **ap, **top;
struct name *n;
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int t, extra, metoo, verbose;
n = np;
if ((t = count(n)) == 0)
errx(1, "No names to unpack");
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/*
* Compute the number of extra arguments we will need.
* We need at least two extra -- one for "mail" and one for
* the terminating 0 pointer. Additional spots may be needed
* to pass along -f to the host mailer.
*/
extra = 2;
extra++;
metoo = value("metoo") != NULL;
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if (metoo)
extra++;
verbose = value("verbose") != NULL;
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if (verbose)
extra++;
top = (char **)salloc((t + extra) * sizeof(*top));
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ap = top;
*ap++ = "sendmail";
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*ap++ = "-i";
if (metoo)
*ap++ = "-m";
if (verbose)
*ap++ = "-v";
for (; n != NULL; n = n->n_flink)
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if ((n->n_type & GDEL) == 0)
*ap++ = n->n_name;
*ap = NULL;
return (top);
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}
/*
* 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 *
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elide(struct name *names)
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{
struct name *np, *t, *new;
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struct name *x;
if (names == NULL)
return (NULL);
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new = names;
np = names;
np = np->n_flink;
if (np != NULL)
np->n_blink = NULL;
new->n_flink = NULL;
while (np != NULL) {
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t = new;
while (strcasecmp(t->n_name, np->n_name) < 0) {
if (t->n_flink == NULL)
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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 = NULL;
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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 = NULL;
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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 != NULL) {
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t = np;
while (t->n_flink != NULL &&
strcasecmp(np->n_name, t->n_flink->n_name) == 0)
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t = t->n_flink;
if (t == np || t == NULL) {
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np = np->n_flink;
continue;
}
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/*
* 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 != NULL)
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t->n_flink->n_blink = np;
np = np->n_flink;
}
return (new);
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}
/*
* Put another node onto a list of names and return
* the list.
*/
struct name *
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put(struct name *list, struct name *node)
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{
node->n_flink = list;
node->n_blink = NULL;
if (list != NULL)
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list->n_blink = node;
return (node);
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}
/*
* Determine the number of undeleted elements in
* a name list and return it.
*/
int
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count(struct name *np)
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{
int c;
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for (c = 0; np != NULL; np = np->n_flink)
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if ((np->n_type & GDEL) == 0)
c++;
return (c);
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}
/*
* Delete the given name from a namelist.
*/
struct name *
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delname(struct name *np, char name[])
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{
struct name *p;
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for (p = np; p != NULL; p = p->n_flink)
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if (strcasecmp(p->n_name, name) == 0) {
if (p->n_blink == NULL) {
if (p->n_flink != NULL)
p->n_flink->n_blink = NULL;
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np = p->n_flink;
continue;
}
if (p->n_flink == NULL) {
if (p->n_blink != NULL)
p->n_blink->n_flink = NULL;
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continue;
}
p->n_blink->n_flink = p->n_flink;
p->n_flink->n_blink = p->n_blink;
}
return (np);
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}
/*
* Pretty print a name list
* Uncomment it if you need it.
*/
/*
void
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prettyprint(struct name *name)
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{
struct name *np;
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np = name;
while (np != NULL) {
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fprintf(stderr, "%s(%d) ", np->n_name, np->n_type);
np = np->n_flink;
}
fprintf(stderr, "\n");
}
*/