| 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 <assert.h> |
| 22 | #include <ctype.h> |
| 23 | #include <stdarg.h> |
| 24 | #include <stdio.h> |
| 25 | #include <string.h> |
| 26 | #include <errno.h> |
| 27 | |
| 28 | #include <unistd.h> |
| 29 | |
| 30 | #include "ucgi.h" |
| 31 | |
| 32 | int debugmode= 0; |
| 33 | |
| 34 | static void outerror(void) { |
| 35 | perror("stdout"); |
| 36 | exit(debugmode ? 0 : -1); |
| 37 | } |
| 38 | |
| 39 | void syserror(const char *m) { |
| 40 | if (printf("Content-Type: text/plain\n" |
| 41 | "Status: 500\n\n" |
| 42 | "ucgi: system call error:\n" |
| 43 | "%s: %s\n", |
| 44 | m,strerror(errno))==EOF || fflush(stdout)) outerror(); |
| 45 | exit(0); |
| 46 | } |
| 47 | |
| 48 | void error(const char *m, int st) { |
| 49 | if (printf("Content-Type: text/plain\n" |
| 50 | "Status: %d\n\n" |
| 51 | "ucgi: error:\n" |
| 52 | "%s\n", |
| 53 | st, m)==EOF || fflush(stdout)) outerror(); |
| 54 | exit(0); |
| 55 | } |
| 56 | |
| 57 | void *xmalloc(size_t sz) { |
| 58 | void *r; |
| 59 | |
| 60 | r= malloc(sz); |
| 61 | if (!r) syserror("malloc failed"); |
| 62 | return r; |
| 63 | } |
| 64 | |
| 65 | void *xrealloc(void *ptr, size_t sz) { |
| 66 | void *r; |
| 67 | |
| 68 | r= realloc(ptr,sz); |
| 69 | if (!r) syserror("realloc failed"); |
| 70 | return r; |
| 71 | } |
| 72 | |
| 73 | void xsetenv(const char *en, const char *ev, int overwrite) { |
| 74 | if (setenv(en,ev,overwrite)) syserror("setenv"); |
| 75 | } |
| 76 | |
| 77 | const char **load_filters(unsigned flags, const char *first, ...) |
| 78 | { |
| 79 | va_list ap; |
| 80 | const char *name, *p, *q, **v; |
| 81 | char *pp; |
| 82 | size_t l, n, sz; |
| 83 | FILE *fp; |
| 84 | char buf[MAX_ENVVAR_NAME]; |
| 85 | |
| 86 | D( if (debugmode) printf(";; load_filters...\n"); ) |
| 87 | va_start(ap, first); |
| 88 | for (name= first; name; name= va_arg(ap, const char *)) { |
| 89 | fp= fopen(name, "r"); if (fp) goto opened; |
| 90 | D( if (debugmode) |
| 91 | printf(";; file `%s': %s\n", name, strerror(errno)); ) |
| 92 | if (errno != ENOENT) syserror("failed to open environment filters"); |
| 93 | } |
| 94 | va_end(ap); |
| 95 | if (flags & LOADF_MUST) syserror("failed to open environment filters"); |
| 96 | D( if (debugmode) printf(";; using default filters\n"); ) |
| 97 | return 0; |
| 98 | |
| 99 | opened: |
| 100 | va_end(ap); |
| 101 | D( if (debugmode) printf(";; file `%s': OK\n", name); ) |
| 102 | |
| 103 | n= 0; sz= 128; v= xmalloc(sz * sizeof(*v)); |
| 104 | for (;;) { |
| 105 | if (!fgets(buf, sizeof(buf), fp)) break; |
| 106 | l= strlen(buf); |
| 107 | if (buf[l - 1] == '\n') buf[--l]= 0; |
| 108 | if (l + 1 == sizeof(buf)) |
| 109 | error("line too long in environment filter file", 500); |
| 110 | p= buf; q= p + l; |
| 111 | while (isspace((unsigned char)*p)) p++; |
| 112 | while (q > p && isspace((unsigned char)q[-1])) q--; |
| 113 | if (*p == '#' || p == q) continue; |
| 114 | l= q - p; |
| 115 | pp= xmalloc(l + 1); |
| 116 | memcpy(pp, p, l); |
| 117 | pp[l]= 0; |
| 118 | v[n++]= pp; |
| 119 | D( if (debugmode) printf(";; filter: `%s'\n", pp); ) |
| 120 | if (n >= sz) { |
| 121 | sz *= 2; |
| 122 | v= xrealloc(v, sz * sizeof(*v)); |
| 123 | } |
| 124 | } |
| 125 | if (ferror(fp)) syserror("failed to read environment filters"); |
| 126 | fclose(fp); |
| 127 | return v; |
| 128 | } |
| 129 | |
| 130 | static int envvar_match(unsigned flags, const char *en, |
| 131 | const char *const *patv, |
| 132 | const char *const *defaults, |
| 133 | const char **ev) |
| 134 | { |
| 135 | const char *const *patp; |
| 136 | const char *q, *pat; |
| 137 | int acceptp; |
| 138 | int rc; |
| 139 | |
| 140 | if (!patv) { patv= defaults; defaults= 0; } |
| 141 | for (patp= patv; (pat= *patp); patp++) { |
| 142 | q= en; |
| 143 | acceptp= 1; |
| 144 | if (*pat == '!' && (flags & FILTF_WILDCARD)) { acceptp= 0; pat++; } |
| 145 | else if (*pat == '?') { |
| 146 | if (strcmp(pat + 1, "DEFAULTS") == 0) { |
| 147 | assert(defaults); |
| 148 | rc= envvar_match(flags, en, defaults, 0, ev); |
| 149 | if (rc) return rc; |
| 150 | } else |
| 151 | error("unknown pattern directive", 500); |
| 152 | continue; |
| 153 | } |
| 154 | |
| 155 | for (;;) { |
| 156 | if (!*pat) { |
| 157 | if (*q != '=') { |
| 158 | D( if (debugmode) |
| 159 | printf(";; mismatch `%s' (prefix)\n", *patp); ) |
| 160 | break; |
| 161 | } |
| 162 | D( if (debugmode) printf(";; matched pattern `%s'\n", *patp); ) |
| 163 | goto match; |
| 164 | } else if (*pat == '*' && (flags & FILTF_WILDCARD)) { |
| 165 | q = strchr(q, '='); |
| 166 | if (!q) { |
| 167 | D( if (debugmode) |
| 168 | printf(";; mismatch `%s' (discard: no `=')\n", *patp); ) |
| 169 | return -1; |
| 170 | } |
| 171 | D( if (debugmode) |
| 172 | printf(";; wildcard match for `%s'\n", *patp); ) |
| 173 | goto match; |
| 174 | } else { |
| 175 | if (*pat++ != *q++) { |
| 176 | D( if (debugmode) printf(";; mismatch `%s'\n", *patp); ) |
| 177 | break; |
| 178 | } |
| 179 | } |
| 180 | } |
| 181 | } |
| 182 | return 0; |
| 183 | |
| 184 | match: |
| 185 | if (!acceptp) return -1; |
| 186 | *ev= q + 1; |
| 187 | return +1; |
| 188 | } |
| 189 | |
| 190 | void filter_environment(unsigned flags, const char *prefix_in, |
| 191 | const char *const *patv, |
| 192 | const char *const *defaults, |
| 193 | void (*foundone)(const char *fulln, |
| 194 | const char *en, const char *ev, |
| 195 | void *p), |
| 196 | void *p) |
| 197 | { |
| 198 | char *const *ep; |
| 199 | const char *en, *ev; |
| 200 | char enbuf[MAX_ENVVAR_NAME]; |
| 201 | size_t n, pn = strlen(prefix_in); |
| 202 | |
| 203 | D( if (debugmode) printf(";; filter_environment...\n"); ) |
| 204 | for (ep= environ; (en= *ep); ep++) { |
| 205 | D( if (debugmode) printf(";; consider env-var `%s'\n", en); ) |
| 206 | if (strncmp(en, prefix_in, pn) != 0 || !en[pn]) { |
| 207 | D( if (debugmode) printf(";; doesn't match prefix\n"); ) |
| 208 | continue; |
| 209 | } |
| 210 | if (envvar_match(flags, en + pn, patv, defaults, &ev) > 0) { |
| 211 | n= strcspn(en, "="); |
| 212 | if (n >= sizeof(enbuf)) |
| 213 | error("environment variable name too long", 500); |
| 214 | memcpy(enbuf, en, n); |
| 215 | enbuf[n]= 0; |
| 216 | D( if (debugmode) |
| 217 | printf(";; full = `%s'; tail = `%s'; value = `%s'\n", |
| 218 | enbuf, enbuf + pn, ev); ) |
| 219 | foundone(enbuf, enbuf + pn, ev, p); |
| 220 | } |
| 221 | } |
| 222 | } |