/*
- * Copyright (C) 1998-1999,2003 Ian Jackson
+ * Copyright 1996-2013,2016 Ian Jackson <ijackson@chiark.greenend.org.uk>
+ * Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
+ * Copyright 1999,2003
+ * Chancellor Masters and Scholars of the University of Cambridge
+ * Copyright 2010 Tony Finch <fanf@dotat.at>
+ * Copyright 2013,2016 Mark Wooding <mdw@distorted.org.uk>
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
+ * the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
- * along with userv-utils; if not, write to the Free Software
- * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- *
- * $Id$
+ * along with userv-utils; if not, see http://www.gnu.org/licenses/.
*/
+#include <assert.h>
+#include <ctype.h>
+#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
}
void syserror(const char *m) {
- if (printf("Content-Type: text/plain\n\n"
+ if (printf("Content-Type: text/plain\n"
+ "Status: 500\n\n"
"ucgi: system call error:\n"
"%s: %s\n",
m,strerror(errno))==EOF || fflush(stdout)) outerror();
exit(0);
}
-void error(const char *m) {
- if (printf("Content-Type: text/plain\n\n"
+void error(const char *m, int st) {
+ if (printf("Content-Type: text/plain\n"
+ "Status: %d\n\n"
"ucgi: error:\n"
"%s\n",
- m)==EOF || fflush(stdout)) outerror();
+ st, m)==EOF || fflush(stdout)) outerror();
exit(0);
}
if (setenv(en,ev,overwrite)) syserror("setenv");
}
+const char **load_filters(unsigned flags, const char *first, ...) {
+ va_list ap;
+ const char *name, *p, *q, **v;
+ char *pp;
+ size_t l, n, sz;
+ FILE *fp;
+ char buf[MAX_ENVVAR_NAME];
+
+ D( if (debugmode) printf(";; load_filters...\n"); )
+ va_start(ap, first);
+ for (name= first; name; name= va_arg(ap, const char *)) {
+ fp= fopen(name, "r"); if (fp) goto opened;
+ D( if (debugmode)
+ printf(";; file `%s': %s\n", name, strerror(errno)); )
+ if (errno != ENOENT) syserror("failed to open environment filters");
+ }
+ va_end(ap);
+ if (flags & LOADF_MUST) syserror("failed to open environment filters");
+ D( if (debugmode) printf(";; using default filters\n"); )
+ return 0;
+
+opened:
+ va_end(ap);
+ D( if (debugmode) printf(";; file `%s': OK\n", name); )
+
+ n= 0; sz= 128; v= xmalloc(sz * sizeof(*v));
+ for (;;) {
+ if (!fgets(buf, sizeof(buf), fp)) break;
+ l= strlen(buf);
+ if (buf[l - 1] == '\n') buf[--l]= 0;
+ if (l + 1 == sizeof(buf))
+ error("line too long in environment filter file", 500);
+ p= buf; q= p + l;
+ while (isspace((unsigned char)*p)) p++;
+ while (q > p && isspace((unsigned char)q[-1])) q--;
+ if (*p == '#' || p == q) continue;
+ l= q - p;
+ pp= xmalloc(l + 1);
+ memcpy(pp, p, l);
+ pp[l]= 0;
+ v[n++]= pp;
+ D( if (debugmode) printf(";; filter: `%s'\n", pp); )
+ if (n >= sz) {
+ sz *= 2;
+ v= xrealloc(v, sz * sizeof(*v));
+ }
+ }
+ if (ferror(fp)) syserror("failed to read environment filters");
+ fclose(fp);
+ return v;
+}
+
+static int envvar_match(unsigned flags, const char *en,
+ const char *const *patv,
+ const char *const *defaults,
+ const char **ev) {
+ const char *const *patp;
+ const char *q, *pat;
+ int acceptp;
+ int rc;
+
+ if (!patv) { patv= defaults; defaults= 0; }
+ for (patp= patv; (pat= *patp); patp++) {
+ q= en;
+ acceptp= 1;
+ if (*pat == '!' && (flags & FILTF_WILDCARD)) { acceptp= 0; pat++; }
+ else if (*pat == '?') {
+ if (strcmp(pat + 1, "DEFAULTS") == 0) {
+ assert(defaults);
+ rc= envvar_match(flags, en, defaults, 0, ev);
+ if (rc) return rc;
+ } else
+ error("unknown pattern directive", 500);
+ continue;
+ }
+
+ for (;;) {
+ if (!*pat) {
+ if (*q != '=') {
+ D( if (debugmode)
+ printf(";; mismatch `%s' (prefix)\n", *patp); )
+ break;
+ }
+ D( if (debugmode) printf(";; matched pattern `%s'\n", *patp); )
+ goto match;
+ } else if (*pat == '*' && (flags & FILTF_WILDCARD)) {
+ q = strchr(q, '=');
+ if (!q) {
+ D( if (debugmode)
+ printf(";; mismatch `%s' (discard: no `=')\n", *patp); )
+ return -1;
+ }
+ D( if (debugmode)
+ printf(";; wildcard match for `%s'\n", *patp); )
+ goto match;
+ } else {
+ if (*pat++ != *q++) {
+ D( if (debugmode) printf(";; mismatch `%s'\n", *patp); )
+ break;
+ }
+ }
+ }
+ }
+ return 0;
+
+match:
+ if (!acceptp) return -1;
+ *ev= q + 1;
+ return +1;
+}
+
void filter_environment(unsigned flags, const char *prefix_in,
const char *const *patv,
+ const char *const *defaults,
void (*foundone)(const char *fulln,
const char *en, const char *ev,
void *p),
- void *p)
-{
+ void *p) {
char *const *ep;
- const char *const *patp;
- const char *en, *ev, *pat, *q;
+ const char *en, *ev;
char enbuf[MAX_ENVVAR_NAME];
size_t n, pn = strlen(prefix_in);
- int acceptp;
D( if (debugmode) printf(";; filter_environment...\n"); )
for (ep= environ; (en= *ep); ep++) {
D( if (debugmode) printf(";; consider env-var `%s'\n", en); )
if (strncmp(en, prefix_in, pn) != 0 || !en[pn]) {
D( if (debugmode) printf(";; doesn't match prefix\n"); )
- goto next_ev;
+ continue;
}
- for (patp= patv; (pat= *patp); patp++) {
- q= en + pn;
- acceptp= 1;
- if (*pat == '!' && (flags & FILTF_WILDCARD)) {
- acceptp= 0; pat++;
- }
- for (;;) {
- if (!*pat) {
- if (*q != '=') {
- D( if (debugmode)
- printf(";; mismatch `%s' (prefix)\n", *patp); )
- goto next_pat;
- }
- D( if (debugmode) printf(";; matched `%s'\n", *patp); )
- ev = q + 1;
- break;
- } else if (*pat == '*' && (flags & FILTF_WILDCARD)) {
- q = strchr(q, '=');
- if (!q) {
- D( if (debugmode)
- printf(";; mismatch `%s' (discard: no `=')\n", *patp); )
- goto next_ev;
- }
- D( if (debugmode)
- printf(";; wildcard match for `%s'\n", *patp); )
- ev = q + 1;
- break;
- } else
- if (*pat++ != *q++) {
- D( if (debugmode) printf(";; mismatch `%s'\n", *patp); )
- goto next_pat;
- }
- }
- if (acceptp) {
- n= q - en;
- if (n >= sizeof(enbuf))
- error("environment variable name too long");
- memcpy(enbuf, en, n);
- enbuf[n]= 0;
- D( if (debugmode)
- printf(";; full = `%s'; tail = `%s'; value = `%s'\n",
- enbuf, enbuf + pn, ev); )
- foundone(enbuf, enbuf + pn, ev, p);
- } D( else if (debugmode)
- printf(";; matched negated pattern\n"); )
- goto next_ev;
- next_pat:;
+ if (envvar_match(flags, en + pn, patv, defaults, &ev) > 0) {
+ n= strcspn(en, "=");
+ if (n >= sizeof(enbuf))
+ error("environment variable name too long", 500);
+ memcpy(enbuf, en, n);
+ enbuf[n]= 0;
+ D( if (debugmode)
+ printf(";; full = `%s'; tail = `%s'; value = `%s'\n",
+ enbuf, enbuf + pn, ev); )
+ foundone(enbuf, enbuf + pn, ev, p);
}
- next_ev:;
}
}
~ian / userv-utils.git / blobdiff