Commit | Line | Data |
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a33962ba | 1 | /* |
711a0748 | 2 | * Copyright (C) 1998-1999,2003 Ian Jackson |
a33962ba | 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 | */ | |
6a580c17 | 20 | |
f7b4be5a MW |
21 | #include <ctype.h> |
22 | #include <stdarg.h> | |
6a580c17 | 23 | #include <stdio.h> |
24 | #include <string.h> | |
6aaa2ce3 | 25 | #include <errno.h> |
6a580c17 | 26 | |
f601a2c6 MW |
27 | #include <unistd.h> |
28 | ||
6a580c17 | 29 | #include "ucgi.h" |
30 | ||
6a580c17 | 31 | int debugmode= 0; |
32 | ||
33 | static void outerror(void) { | |
34 | perror("stdout"); | |
35 | exit(debugmode ? 0 : -1); | |
36 | } | |
37 | ||
38 | void syserror(const char *m) { | |
39 | if (printf("Content-Type: text/plain\n\n" | |
40 | "ucgi: system call error:\n" | |
41 | "%s: %s\n", | |
42 | m,strerror(errno))==EOF || fflush(stdout)) outerror(); | |
43 | exit(0); | |
44 | } | |
45 | ||
46 | void error(const char *m) { | |
47 | if (printf("Content-Type: text/plain\n\n" | |
48 | "ucgi: error:\n" | |
49 | "%s\n", | |
50 | m)==EOF || fflush(stdout)) outerror(); | |
51 | exit(0); | |
52 | } | |
53 | ||
54 | void *xmalloc(size_t sz) { | |
55 | void *r; | |
56 | ||
57 | r= malloc(sz); | |
58 | if (!r) syserror("malloc failed"); | |
59 | return r; | |
60 | } | |
61 | ||
44a77f48 MW |
62 | void *xrealloc(void *ptr, size_t sz) { |
63 | void *r; | |
64 | ||
65 | r= realloc(ptr,sz); | |
66 | if (!r) syserror("realloc failed"); | |
67 | return r; | |
68 | } | |
69 | ||
6a580c17 | 70 | void xsetenv(const char *en, const char *ev, int overwrite) { |
71 | if (setenv(en,ev,overwrite)) syserror("setenv"); | |
72 | } | |
f601a2c6 | 73 | |
f7b4be5a MW |
74 | const char **load_filters(unsigned flags, const char *first, ...) |
75 | { | |
76 | va_list ap; | |
77 | const char *name, *p, *q, **v; | |
78 | char *pp; | |
79 | size_t l, n, sz; | |
80 | FILE *fp; | |
81 | char buf[MAX_ENVVAR_NAME]; | |
82 | ||
83 | D( if (debugmode) printf(";; load_filters...\n"); ) | |
84 | va_start(ap, first); | |
85 | for (name= first; name; name= va_arg(ap, const char *)) { | |
86 | fp= fopen(name, "r"); if (fp) goto opened; | |
87 | D( if (debugmode) | |
88 | printf(";; file `%s': %s\n", name, strerror(errno)); ) | |
89 | if (errno != ENOENT) syserror("failed to open environment filters"); | |
90 | } | |
91 | va_end(ap); | |
92 | if (flags & LOADF_MUST) syserror("failed to open environment filters"); | |
93 | D( if (debugmode) printf(";; using default filters\n"); ) | |
94 | return 0; | |
95 | ||
96 | opened: | |
97 | va_end(ap); | |
98 | D( if (debugmode) printf(";; file `%s': OK\n", name); ) | |
99 | ||
100 | n= 0; sz= 128; v= xmalloc(sz * sizeof(*v)); | |
101 | for (;;) { | |
102 | if (!fgets(buf, sizeof(buf), fp)) break; | |
103 | l= strlen(buf); | |
104 | if (buf[l - 1] == '\n') buf[--l]= 0; | |
105 | if (l + 1 == sizeof(buf)) | |
106 | error("line too long in environment filter file"); | |
107 | p= buf; q= p + l; | |
108 | while (isspace((unsigned char)*p)) p++; | |
109 | while (q > p && isspace((unsigned char)q[-1])) q--; | |
110 | if (*p == '#' || p == q) continue; | |
111 | l= q - p; | |
112 | pp= xmalloc(l + 1); | |
113 | memcpy(pp, p, l); | |
114 | pp[l]= 0; | |
115 | v[n++]= pp; | |
116 | D( if (debugmode) printf(";; filter: `%s'\n", pp); ) | |
117 | if (n >= sz) { | |
118 | sz *= 2; | |
119 | v= xrealloc(v, sz * sizeof(*v)); | |
120 | } | |
121 | } | |
122 | if (ferror(fp)) syserror("failed to read environment filters"); | |
123 | fclose(fp); | |
124 | return v; | |
125 | } | |
126 | ||
f601a2c6 MW |
127 | void filter_environment(unsigned flags, const char *prefix_in, |
128 | const char *const *patv, | |
129 | void (*foundone)(const char *fulln, | |
130 | const char *en, const char *ev, | |
131 | void *p), | |
132 | void *p) | |
133 | { | |
134 | char *const *ep; | |
135 | const char *const *patp; | |
136 | const char *en, *ev, *pat, *q; | |
137 | char enbuf[MAX_ENVVAR_NAME]; | |
138 | size_t n, pn = strlen(prefix_in); | |
139 | int acceptp; | |
140 | ||
141 | D( if (debugmode) printf(";; filter_environment...\n"); ) | |
142 | for (ep= environ; (en= *ep); ep++) { | |
143 | D( if (debugmode) printf(";; consider env-var `%s'\n", en); ) | |
144 | if (strncmp(en, prefix_in, pn) != 0 || !en[pn]) { | |
145 | D( if (debugmode) printf(";; doesn't match prefix\n"); ) | |
146 | goto next_ev; | |
147 | } | |
148 | for (patp= patv; (pat= *patp); patp++) { | |
149 | q= en + pn; | |
150 | acceptp= 1; | |
151 | if (*pat == '!' && (flags & FILTF_WILDCARD)) { | |
152 | acceptp= 0; pat++; | |
153 | } | |
154 | for (;;) { | |
155 | if (!*pat) { | |
156 | if (*q != '=') { | |
157 | D( if (debugmode) | |
158 | printf(";; mismatch `%s' (prefix)\n", *patp); ) | |
159 | goto next_pat; | |
160 | } | |
161 | D( if (debugmode) printf(";; matched `%s'\n", *patp); ) | |
162 | ev = q + 1; | |
163 | break; | |
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 | goto next_ev; | |
170 | } | |
171 | D( if (debugmode) | |
172 | printf(";; wildcard match for `%s'\n", *patp); ) | |
173 | ev = q + 1; | |
174 | break; | |
175 | } else | |
176 | if (*pat++ != *q++) { | |
177 | D( if (debugmode) printf(";; mismatch `%s'\n", *patp); ) | |
178 | goto next_pat; | |
179 | } | |
180 | } | |
181 | if (acceptp) { | |
182 | n= q - en; | |
183 | if (n >= sizeof(enbuf)) | |
184 | error("environment variable name too long"); | |
185 | memcpy(enbuf, en, n); | |
186 | enbuf[n]= 0; | |
187 | D( if (debugmode) | |
188 | printf(";; full = `%s'; tail = `%s'; value = `%s'\n", | |
189 | enbuf, enbuf + pn, ev); ) | |
190 | foundone(enbuf, enbuf + pn, ev, p); | |
191 | } D( else if (debugmode) | |
192 | printf(";; matched negated pattern\n"); ) | |
193 | goto next_ev; | |
194 | next_pat:; | |
195 | } | |
196 | next_ev:; | |
197 | } | |
198 | } |