+++ /dev/null
-/*
- * 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 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * 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>
-
-#include <unistd.h>
-
-#include "ucgi.h"
-
-int debugmode= 0;
-
-static void outerror(void) {
- perror("stdout");
- exit(debugmode ? 0 : -1);
-}
-
-void syserror(const char *m) {
- 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, int st) {
- if (printf("Content-Type: text/plain\n"
- "Status: %d\n\n"
- "ucgi: error:\n"
- "%s\n",
- st, m)==EOF || fflush(stdout)) outerror();
- exit(0);
-}
-
-void *xmalloc(size_t sz) {
- void *r;
-
- r= malloc(sz);
- if (!r) syserror("malloc failed");
- return r;
-}
-
-void *xrealloc(void *ptr, size_t sz) {
- void *r;
-
- r= realloc(ptr,sz);
- if (!r) syserror("realloc failed");
- return r;
-}
-
-void xsetenv(const char *en, const char *ev, int overwrite) {
- 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) {
- char *const *ep;
- const char *en, *ev;
- char enbuf[MAX_ENVVAR_NAME];
- size_t n, pn = strlen(prefix_in);
-
- 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"); )
- continue;
- }
- 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);
- }
- }
-}
~ian / userv-utils.git / blobdiff