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>
21 struct aka *akahead = NULL;
22 struct aka *akatail = NULL;
24 struct home *homehead = NULL;
25 struct home *hometail = NULL;
33 char *akresult (struct aka *);
34 char *akvalue (char *);
37 static char *akval (struct aka *, char *);
38 static int aleq (char *, char *);
39 static char *scanp (unsigned char *);
40 static char *getp (char *);
41 static char *seekp (char *, char *, char **);
42 static int addfile (struct aka *, char *);
43 static int addgroup (struct aka *, char *);
44 static int addmember (struct aka *, char *);
45 static int addall (struct aka *);
46 static char *getalias (char *);
47 static void add_aka (struct aka *, char *);
48 static struct aka *akalloc (char *);
49 static struct home *hmalloc (struct passwd *);
50 struct home *seek_home (char *);
53 /* Do mh alias substitution on 's' and return the results. */
63 v = akval (akahead, s);
78 akresult (struct aka *ak)
80 register char *cp = NULL, *dp, *pp;
81 register struct adr *ad;
83 for (ad = ak->ak_addr; ad; ad = ad->ad_next) {
84 pp = ad->ad_local ? akval (ak->ak_next, ad->ad_text)
85 : getcpy (ad->ad_text);
89 cp = concat (cp, ",", pp, NULL);
98 akvis = ak->ak_visible;
104 akval (struct aka *ak, char *s)
109 for (; ak; ak = ak->ak_next)
110 if (aleq (s, ak->ak_name))
111 return akresult (ak);
118 aleq (char *string, char *aliasent)
122 while ((c = *string++))
123 if (*aliasent == '*')
126 if ((c | 040) != (*aliasent | 040))
131 return (*aliasent == 0 || *aliasent == '*');
139 register char *bp, *cp, *pp;
141 register struct aka *ak = NULL;
145 && (strncmp (file, "./", 2) && strncmp (file, "../", 3)))
146 file = etcpath (file);
147 if ((fp = fopen (file, "r")) == NULL) {
152 while (vfgets (fp, &ap) == OK) {
154 switch (*(pp = scanp (bp))) {
155 case '<': /* recurse a level */
156 if (!*(cp = getp (pp + 1))) {
157 akerrst = "'<' without alias-file";
161 if ((i = alias (cp)) != AK_OK) {
166 case ':': /* comment */
174 if (!*(cp = seekp (pp, &lc, &ap))) {
178 if (!(ak = akalloc (cp))) {
196 switch (*(pp = scanp (ap))) {
201 case '<': /* read values from file */
202 if (!*(cp = getp (pp + 1))) {
206 if (!addfile (ak, cp)) {
212 case '=': /* UNIX group */
213 if (!*(cp = getp (pp + 1))) {
217 if (!addgroup (ak, cp)) {
223 case '+': /* UNIX group members */
224 if (!*(cp = getp (pp + 1))) {
228 if (!addmember (ak, cp)) {
234 case '*': /* Everyone */
239 while ((cp = getalias (pp)))
253 static char buffer[BUFSIZ];
257 snprintf (buffer, sizeof(buffer), "unable to read '%s'", akerrst);
261 snprintf (buffer, sizeof(buffer), "error in line '%s'", akerrst);
265 snprintf (buffer, sizeof(buffer), "out of memory while on '%s'", akerrst);
269 snprintf (buffer, sizeof(buffer), "no such group as '%s'", akerrst);
273 snprintf (buffer, sizeof(buffer), "unknown error (%d)", i);
282 scanp (unsigned char *p)
293 register unsigned char *cp = scanp (p);
296 while (!isspace (*cp) && *cp)
305 seekp (char *p, char *c, char **a)
307 register unsigned char *cp;
310 while (!isspace (*cp) && *cp && *cp != ':' && *cp != ';')
321 addfile (struct aka *ak, char *file)
327 if (!(fp = fopen (etcpath (file), "r"))) {
332 while (fgets (buffer, sizeof buffer, fp))
333 while ((cp = getalias (buffer)))
342 addgroup (struct aka *ak, char *grp)
345 register struct group *gr = getgrnam (grp);
346 register struct home *hm = NULL;
349 gr = getgrgid (atoi (grp));
356 if (homehead == NULL)
360 while ((gp = *gr->gr_mem++))
365 for (hm = homehead; hm; hm = hm->h_next)
366 if (!strcmp (hm->h_name, gp)) {
367 add_aka (ak, hm->h_name);
371 if ((pw = getpwnam(gp)))
384 addmember (struct aka *ak, char *grp)
387 register struct group *gr = getgrnam (grp);
388 register struct home *hm = NULL;
402 if (homehead == NULL)
406 for (hm = homehead; hm; hm = hm->h_next)
407 if (hm->h_gid == gid)
408 add_aka (ak, hm->h_name);
415 addall (struct aka *ak)
417 int noshell = NoShell == NULL || *NoShell == 0;
418 register struct home *hm;
421 if (homehead == NULL)
427 for (hm = homehead; hm; hm = hm->h_next)
428 if (hm->h_uid > Everyone
429 && (noshell || strcmp (hm->h_shell, NoShell)))
430 add_aka (ak, hm->h_name);
432 return homehead != NULL;
437 getalias (char *addrs)
439 register unsigned char *pp, *qp;
440 static char *cp = NULL;
448 for (pp = cp; isspace (*pp); pp++)
452 for (qp = pp; *qp != 0 && *qp != ','; qp++)
456 for (cp = qp, qp--; qp > pp; qp--)
469 add_aka (struct aka *ak, char *pp)
471 register struct adr *ad, *ld;
473 for (ad = ak->ak_addr, ld = NULL; ad; ld = ad, ad = ad->ad_next)
474 if (!strcmp (pp, ad->ad_text))
477 ad = (struct adr *) mh_xmalloc (sizeof(*ad));
478 ad->ad_text = getcpy (pp);
479 ad->ad_local = strchr(pp, '@') == NULL && strchr(pp, '!') == NULL;
491 register struct passwd *pw;
497 /* if the list has yet to be initialized */
498 /* zap the list, and rebuild from scratch */
506 while ((pw = getpwent ()))
520 register struct aka *p;
522 p = (struct aka *) mh_xmalloc (sizeof(*p));
524 p->ak_name = getcpy (id);
529 akatail->ak_next = p;
539 hmalloc (struct passwd *pw)
541 register struct home *p;
543 p = (struct home *) mh_xmalloc (sizeof(*p));
545 p->h_name = getcpy (pw->pw_name);
546 p->h_uid = pw->pw_uid;
547 p->h_gid = pw->pw_gid;
548 p->h_home = getcpy (pw->pw_dir);
549 p->h_shell = getcpy (pw->pw_shell);
552 if (hometail != NULL)
553 hometail->h_next = p;
554 if (homehead == NULL)
563 seek_home (char *name)
565 register struct home *hp;
573 if (homehead == NULL)
577 for (hp = homehead; hp; hp = hp->h_next)
578 if (!mh_strcasecmp (name, hp->h_name))
583 * The only place where there might be problems.
584 * This assumes that ALL usernames are kept in lowercase.
586 for (c = name, c1 = lname; *c && (c1 - lname < sizeof(lname) - 1); c++, c1++) {
587 if (isalpha(*c) && isupper(*c))
593 if ((pw = getpwnam(lname)))