3 * aliasbr.c -- new aliasing mechanism
16 struct aka *akahead = NULL;
17 struct aka *akatail = NULL;
19 struct home *homehead = NULL;
20 struct home *hometail = NULL;
28 char *akresult (struct aka *);
29 char *akvalue (char *);
32 static char *akval (struct aka *, char *);
33 static int aleq (char *, char *);
34 static char *scanp (char *);
35 static char *getp (char *);
36 static char *seekp (char *, char *, char **);
37 static int addfile (struct aka *, char *);
38 static int addgroup (struct aka *, char *);
39 static int addmember (struct aka *, char *);
40 static int addall (struct aka *);
41 static char *getalias (char *);
42 static void add_aka (struct aka *, char *);
43 static struct aka *akalloc (char *);
44 static struct home *hmalloc (struct passwd *);
46 struct home *seek_home (char *);
50 /* Do mh alias substitution on 's' and return the results. */
60 v = akval (akahead, s);
75 akresult (struct aka *ak)
77 register char *cp = NULL, *dp, *pp;
78 register struct adr *ad;
80 for (ad = ak->ak_addr; ad; ad = ad->ad_next) {
81 pp = ad->ad_local ? akval (ak->ak_next, ad->ad_text)
82 : getcpy (ad->ad_text);
86 cp = concat (cp, ",", pp, NULL);
95 akvis = ak->ak_visible;
101 akval (struct aka *ak, char *s)
106 for (; ak; ak = ak->ak_next)
107 if (aleq (s, ak->ak_name))
108 return akresult (ak);
115 aleq (char *string, char *aliasent)
119 while ((c = *string++))
120 if (*aliasent == '*')
123 if ((c | 040) != (*aliasent | 040))
128 return (*aliasent == 0 || *aliasent == '*');
136 register char *bp, *cp, *pp;
138 register struct aka *ak = NULL;
142 && (strncmp (file, "./", 2) && strncmp (file, "../", 3)))
143 file = etcpath (file);
144 if ((fp = fopen (file, "r")) == NULL) {
149 while (vfgets (fp, &ap) == OK) {
151 switch (*(pp = scanp (bp))) {
152 case '<': /* recurse a level */
153 if (!*(cp = getp (pp + 1))) {
154 akerrst = "'<' without alias-file";
158 if ((i = alias (cp)) != AK_OK) {
163 case ':': /* comment */
171 if (!*(cp = seekp (pp, &lc, &ap))) {
175 if (!(ak = akalloc (cp))) {
193 switch (*(pp = scanp (ap))) {
198 case '<': /* read values from file */
199 if (!*(cp = getp (pp + 1))) {
203 if (!addfile (ak, cp)) {
209 case '=': /* UNIX group */
210 if (!*(cp = getp (pp + 1))) {
214 if (!addgroup (ak, cp)) {
220 case '+': /* UNIX group members */
221 if (!*(cp = getp (pp + 1))) {
225 if (!addmember (ak, cp)) {
231 case '*': /* Everyone */
236 while ((cp = getalias (pp)))
250 static char buffer[BUFSIZ];
254 snprintf (buffer, sizeof(buffer), "unable to read '%s'", akerrst);
258 snprintf (buffer, sizeof(buffer), "error in line '%s'", akerrst);
262 snprintf (buffer, sizeof(buffer), "out of memory while on '%s'", akerrst);
266 snprintf (buffer, sizeof(buffer), "no such group as '%s'", akerrst);
270 snprintf (buffer, sizeof(buffer), "unknown error (%d)", i);
290 register char *cp = scanp (p);
293 while (!isspace (*cp) && *cp)
302 seekp (char *p, char *c, char **a)
307 while (!isspace (*cp) && *cp && *cp != ':' && *cp != ';')
318 addfile (struct aka *ak, char *file)
324 if (!(fp = fopen (etcpath (file), "r"))) {
329 while (fgets (buffer, sizeof buffer, fp))
330 while ((cp = getalias (buffer)))
339 addgroup (struct aka *ak, char *grp)
342 register struct group *gr = getgrnam (grp);
343 register struct home *hm = NULL;
346 gr = getgrgid (atoi (grp));
353 if (homehead == NULL)
357 while ((gp = *gr->gr_mem++))
362 for (hm = homehead; hm; hm = hm->h_next)
363 if (!strcmp (hm->h_name, gp)) {
364 add_aka (ak, hm->h_name);
368 if ((pw = getpwnam(gp)))
381 addmember (struct aka *ak, char *grp)
384 register struct group *gr = getgrnam (grp);
385 register struct home *hm = NULL;
399 if (homehead == NULL)
403 for (hm = homehead; hm; hm = hm->h_next)
404 if (hm->h_gid == gid)
405 add_aka (ak, hm->h_name);
412 addall (struct aka *ak)
414 int noshell = NoShell == NULL || *NoShell == 0;
415 register struct home *hm;
418 if (homehead == NULL)
424 for (hm = homehead; hm; hm = hm->h_next)
425 if (hm->h_uid > Everyone
426 && (noshell || strcmp (hm->h_shell, NoShell)))
427 add_aka (ak, hm->h_name);
429 return homehead != NULL;
434 getalias (char *addrs)
436 register char *pp, *qp;
437 static char *cp = NULL;
445 for (pp = cp; isspace (*pp); pp++)
449 for (qp = pp; *qp != 0 && *qp != ','; qp++)
453 for (cp = qp, qp--; qp > pp; qp--)
466 add_aka (struct aka *ak, char *pp)
468 register struct adr *ad, *ld;
470 for (ad = ak->ak_addr, ld = NULL; ad; ld = ad, ad = ad->ad_next)
471 if (!strcmp (pp, ad->ad_text))
474 ad = (struct adr *) malloc (sizeof(*ad));
477 ad->ad_text = getcpy (pp);
478 ad->ad_local = strchr(pp, '@') == NULL && strchr(pp, '!') == NULL;
490 register struct passwd *pw;
496 /* if the list has yet to be initialized */
497 /* zap the list, and rebuild from scratch */
505 while ((pw = getpwent ()))
519 register struct aka *p;
521 if (!(p = (struct aka *) malloc (sizeof(*p))))
524 p->ak_name = getcpy (id);
529 akatail->ak_next = p;
539 hmalloc (struct passwd *pw)
541 register struct home *p;
543 if (!(p = (struct home *) malloc (sizeof(*p))))
546 p->h_name = getcpy (pw->pw_name);
547 p->h_uid = pw->pw_uid;
548 p->h_gid = pw->pw_gid;
549 p->h_home = getcpy (pw->pw_dir);
550 p->h_shell = getcpy (pw->pw_shell);
553 if (hometail != NULL)
554 hometail->h_next = p;
555 if (homehead == NULL)
565 seek_home (char *name)
567 register struct home *hp;
574 if (homehead == NULL)
578 for (hp = homehead; hp; hp = hp->h_next)
579 if (!strcasecmp (name, hp->h_name))
584 * The only place where there might be problems.
585 * This assumes that ALL usernames are kept in lowercase.
587 for (c = name, c1 = lname; *c && (c1 - lname < sizeof(lname) - 1); c++, c1++) {
588 if (isalpha(*c) && isupper(*c))
594 if ((pw = getpwnam(lname)))