3 * aliasbr.c -- new aliasing mechanism
7 * This code is Copyright (c) 2002, by the authors of nmh. See the
8 * COPYRIGHT file in the root directory of the nmh distribution for
9 * complete copyright information.
13 #include <h/aliasbr.h>
20 struct aka *akahead = NULL;
21 struct aka *akatail = NULL;
23 struct home *homehead = NULL;
24 struct home *hometail = NULL;
32 char *akresult (struct aka *);
33 char *akvalue (char *);
36 static char *akval (struct aka *, char *);
37 static int aleq (char *, char *);
38 static char *scanp (char *);
39 static char *getp (char *);
40 static char *seekp (char *, char *, char **);
41 static int addfile (struct aka *, char *);
42 static int addgroup (struct aka *, char *);
43 static int addmember (struct aka *, char *);
44 static int addall (struct aka *);
45 static char *getalias (char *);
46 static void add_aka (struct aka *, char *);
47 static struct aka *akalloc (char *);
48 static struct home *hmalloc (struct passwd *);
50 struct home *seek_home (char *);
54 /* Do mh alias substitution on 's' and return the results. */
64 v = akval (akahead, s);
79 akresult (struct aka *ak)
81 register char *cp = NULL, *dp, *pp;
82 register struct adr *ad;
84 for (ad = ak->ak_addr; ad; ad = ad->ad_next) {
85 pp = ad->ad_local ? akval (ak->ak_next, ad->ad_text)
86 : getcpy (ad->ad_text);
90 cp = concat (cp, ",", pp, NULL);
99 akvis = ak->ak_visible;
105 akval (struct aka *ak, char *s)
110 for (; ak; ak = ak->ak_next)
111 if (aleq (s, ak->ak_name))
112 return akresult (ak);
119 aleq (char *string, char *aliasent)
123 while ((c = *string++))
124 if (*aliasent == '*')
127 if ((c | 040) != (*aliasent | 040))
132 return (*aliasent == 0 || *aliasent == '*');
140 register char *bp, *cp, *pp;
142 register struct aka *ak = NULL;
146 && (strncmp (file, "./", 2) && strncmp (file, "../", 3)))
147 file = etcpath (file);
148 if ((fp = fopen (file, "r")) == NULL) {
153 while (vfgets (fp, &ap) == OK) {
155 switch (*(pp = scanp (bp))) {
156 case '<': /* recurse a level */
157 if (!*(cp = getp (pp + 1))) {
158 akerrst = "'<' without alias-file";
162 if ((i = alias (cp)) != AK_OK) {
167 case ':': /* comment */
175 if (!*(cp = seekp (pp, &lc, &ap))) {
179 if (!(ak = akalloc (cp))) {
197 switch (*(pp = scanp (ap))) {
202 case '<': /* read values from file */
203 if (!*(cp = getp (pp + 1))) {
207 if (!addfile (ak, cp)) {
213 case '=': /* UNIX group */
214 if (!*(cp = getp (pp + 1))) {
218 if (!addgroup (ak, cp)) {
224 case '+': /* UNIX group members */
225 if (!*(cp = getp (pp + 1))) {
229 if (!addmember (ak, cp)) {
235 case '*': /* Everyone */
240 while ((cp = getalias (pp)))
254 static char buffer[BUFSIZ];
258 snprintf (buffer, sizeof(buffer), "unable to read '%s'", akerrst);
262 snprintf (buffer, sizeof(buffer), "error in line '%s'", akerrst);
266 snprintf (buffer, sizeof(buffer), "out of memory while on '%s'", akerrst);
270 snprintf (buffer, sizeof(buffer), "no such group as '%s'", akerrst);
274 snprintf (buffer, sizeof(buffer), "unknown error (%d)", i);
294 register char *cp = scanp (p);
297 while (!isspace (*cp) && *cp)
306 seekp (char *p, char *c, char **a)
311 while (!isspace (*cp) && *cp && *cp != ':' && *cp != ';')
322 addfile (struct aka *ak, char *file)
328 if (!(fp = fopen (etcpath (file), "r"))) {
333 while (fgets (buffer, sizeof buffer, fp))
334 while ((cp = getalias (buffer)))
343 addgroup (struct aka *ak, char *grp)
346 register struct group *gr = getgrnam (grp);
347 register struct home *hm = NULL;
350 gr = getgrgid (atoi (grp));
357 if (homehead == NULL)
361 while ((gp = *gr->gr_mem++))
366 for (hm = homehead; hm; hm = hm->h_next)
367 if (!strcmp (hm->h_name, gp)) {
368 add_aka (ak, hm->h_name);
372 if ((pw = getpwnam(gp)))
385 addmember (struct aka *ak, char *grp)
388 register struct group *gr = getgrnam (grp);
389 register struct home *hm = NULL;
403 if (homehead == NULL)
407 for (hm = homehead; hm; hm = hm->h_next)
408 if (hm->h_gid == gid)
409 add_aka (ak, hm->h_name);
416 addall (struct aka *ak)
418 int noshell = NoShell == NULL || *NoShell == 0;
419 register struct home *hm;
422 if (homehead == NULL)
428 for (hm = homehead; hm; hm = hm->h_next)
429 if (hm->h_uid > Everyone
430 && (noshell || strcmp (hm->h_shell, NoShell)))
431 add_aka (ak, hm->h_name);
433 return homehead != NULL;
438 getalias (char *addrs)
440 register char *pp, *qp;
441 static char *cp = NULL;
449 for (pp = cp; isspace (*pp); pp++)
453 for (qp = pp; *qp != 0 && *qp != ','; qp++)
457 for (cp = qp, qp--; qp > pp; qp--)
470 add_aka (struct aka *ak, char *pp)
472 register struct adr *ad, *ld;
474 for (ad = ak->ak_addr, ld = NULL; ad; ld = ad, ad = ad->ad_next)
475 if (!strcmp (pp, ad->ad_text))
478 ad = (struct adr *) malloc (sizeof(*ad));
481 ad->ad_text = getcpy (pp);
482 ad->ad_local = strchr(pp, '@') == NULL && strchr(pp, '!') == NULL;
494 register struct passwd *pw;
500 /* if the list has yet to be initialized */
501 /* zap the list, and rebuild from scratch */
509 while ((pw = getpwent ()))
523 register struct aka *p;
525 if (!(p = (struct aka *) malloc (sizeof(*p))))
528 p->ak_name = getcpy (id);
533 akatail->ak_next = p;
543 hmalloc (struct passwd *pw)
545 register struct home *p;
547 if (!(p = (struct home *) malloc (sizeof(*p))))
550 p->h_name = getcpy (pw->pw_name);
551 p->h_uid = pw->pw_uid;
552 p->h_gid = pw->pw_gid;
553 p->h_home = getcpy (pw->pw_dir);
554 p->h_shell = getcpy (pw->pw_shell);
557 if (hometail != NULL)
558 hometail->h_next = p;
559 if (homehead == NULL)
569 seek_home (char *name)
571 register struct home *hp;
578 if (homehead == NULL)
582 for (hp = homehead; hp; hp = hp->h_next)
583 if (!strcasecmp (name, hp->h_name))
588 * The only place where there might be problems.
589 * This assumes that ALL usernames are kept in lowercase.
591 for (c = name, c1 = lname; *c && (c1 - lname < sizeof(lname) - 1); c++, c1++) {
592 if (isalpha(*c) && isupper(*c))
598 if ((pw = getpwnam(lname)))