| 1 | /* |
| 2 | * Copyright (C) 1998-1999,2003 Ian Jackson |
| 3 | * |
| 4 | * This is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with userv-utils; if not, write to the Free Software |
| 16 | * Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | * |
| 18 | * $Id$ |
| 19 | */ |
| 20 | |
| 21 | #include <stdio.h> |
| 22 | #include <string.h> |
| 23 | #include <errno.h> |
| 24 | |
| 25 | #include <unistd.h> |
| 26 | |
| 27 | #include "ucgi.h" |
| 28 | |
| 29 | int debugmode= 0; |
| 30 | |
| 31 | static void outerror(void) { |
| 32 | perror("stdout"); |
| 33 | exit(debugmode ? 0 : -1); |
| 34 | } |
| 35 | |
| 36 | void syserror(const char *m) { |
| 37 | if (printf("Content-Type: text/plain\n\n" |
| 38 | "ucgi: system call error:\n" |
| 39 | "%s: %s\n", |
| 40 | m,strerror(errno))==EOF || fflush(stdout)) outerror(); |
| 41 | exit(0); |
| 42 | } |
| 43 | |
| 44 | void error(const char *m) { |
| 45 | if (printf("Content-Type: text/plain\n\n" |
| 46 | "ucgi: error:\n" |
| 47 | "%s\n", |
| 48 | m)==EOF || fflush(stdout)) outerror(); |
| 49 | exit(0); |
| 50 | } |
| 51 | |
| 52 | void *xmalloc(size_t sz) { |
| 53 | void *r; |
| 54 | |
| 55 | r= malloc(sz); |
| 56 | if (!r) syserror("malloc failed"); |
| 57 | return r; |
| 58 | } |
| 59 | |
| 60 | void *xrealloc(void *ptr, size_t sz) { |
| 61 | void *r; |
| 62 | |
| 63 | r= realloc(ptr,sz); |
| 64 | if (!r) syserror("realloc failed"); |
| 65 | return r; |
| 66 | } |
| 67 | |
| 68 | void xsetenv(const char *en, const char *ev, int overwrite) { |
| 69 | if (setenv(en,ev,overwrite)) syserror("setenv"); |
| 70 | } |
| 71 | |
| 72 | void filter_environment(unsigned flags, const char *prefix_in, |
| 73 | const char *const *patv, |
| 74 | void (*foundone)(const char *fulln, |
| 75 | const char *en, const char *ev, |
| 76 | void *p), |
| 77 | void *p) |
| 78 | { |
| 79 | char *const *ep; |
| 80 | const char *const *patp; |
| 81 | const char *en, *ev, *pat, *q; |
| 82 | char enbuf[MAX_ENVVAR_NAME]; |
| 83 | size_t n, pn = strlen(prefix_in); |
| 84 | int acceptp; |
| 85 | |
| 86 | D( if (debugmode) printf(";; filter_environment...\n"); ) |
| 87 | for (ep= environ; (en= *ep); ep++) { |
| 88 | D( if (debugmode) printf(";; consider env-var `%s'\n", en); ) |
| 89 | if (strncmp(en, prefix_in, pn) != 0 || !en[pn]) { |
| 90 | D( if (debugmode) printf(";; doesn't match prefix\n"); ) |
| 91 | goto next_ev; |
| 92 | } |
| 93 | for (patp= patv; (pat= *patp); patp++) { |
| 94 | q= en + pn; |
| 95 | acceptp= 1; |
| 96 | if (*pat == '!' && (flags & FILTF_WILDCARD)) { |
| 97 | acceptp= 0; pat++; |
| 98 | } |
| 99 | for (;;) { |
| 100 | if (!*pat) { |
| 101 | if (*q != '=') { |
| 102 | D( if (debugmode) |
| 103 | printf(";; mismatch `%s' (prefix)\n", *patp); ) |
| 104 | goto next_pat; |
| 105 | } |
| 106 | D( if (debugmode) printf(";; matched `%s'\n", *patp); ) |
| 107 | ev = q + 1; |
| 108 | break; |
| 109 | } else if (*pat == '*' && (flags & FILTF_WILDCARD)) { |
| 110 | q = strchr(q, '='); |
| 111 | if (!q) { |
| 112 | D( if (debugmode) |
| 113 | printf(";; mismatch `%s' (discard: no `=')\n", *patp); ) |
| 114 | goto next_ev; |
| 115 | } |
| 116 | D( if (debugmode) |
| 117 | printf(";; wildcard match for `%s'\n", *patp); ) |
| 118 | ev = q + 1; |
| 119 | break; |
| 120 | } else |
| 121 | if (*pat++ != *q++) { |
| 122 | D( if (debugmode) printf(";; mismatch `%s'\n", *patp); ) |
| 123 | goto next_pat; |
| 124 | } |
| 125 | } |
| 126 | if (acceptp) { |
| 127 | n= q - en; |
| 128 | if (n >= sizeof(enbuf)) |
| 129 | error("environment variable name too long"); |
| 130 | memcpy(enbuf, en, n); |
| 131 | enbuf[n]= 0; |
| 132 | D( if (debugmode) |
| 133 | printf(";; full = `%s'; tail = `%s'; value = `%s'\n", |
| 134 | enbuf, enbuf + pn, ev); ) |
| 135 | foundone(enbuf, enbuf + pn, ev, p); |
| 136 | } D( else if (debugmode) |
| 137 | printf(";; matched negated pattern\n"); ) |
| 138 | goto next_ev; |
| 139 | next_pat:; |
| 140 | } |
| 141 | next_ev:; |
| 142 | } |
| 143 | } |