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/*
* 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);
}
}
}
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