postlicyd/config.c

   1 /******************************************************************************/
   2 /*          pfixtools: a collection of postfix related tools                  */
   3 /*          ~~~~~~~~~                                                         */
   4 /*  ________________________________________________________________________  */
   5 /*                                                                            */
   6 /*  Redistribution and use in source and binary forms, with or without        */
   7 /*  modification, are permitted provided that the following conditions        */
   8 /*  are met:                                                                  */
   9 /*                                                                            */
  10 /*  1. Redistributions of source code must retain the above copyright         */
  11 /*     notice, this list of conditions and the following disclaimer.          */
  12 /*  2. Redistributions in binary form must reproduce the above copyright      */
  13 /*     notice, this list of conditions and the following disclaimer in the    */
  14 /*     documentation and/or other materials provided with the distribution.   */
  15 /*  3. The names of its contributors may not be used to endorse or promote    */
  16 /*     products derived from this software without specific prior written     */
  17 /*     permission.                                                            */
  18 /*                                                                            */
  19 /*  THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND   */
  20 /*  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE     */
  21 /*  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR        */
  22 /*  PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS    */
  23 /*  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR    */
  24 /*  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF      */
  25 /*  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS  */
  26 /*  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN   */
  27 /*  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)   */
  28 /*  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF    */
  29 /*  THE POSSIBILITY OF SUCH DAMAGE.                                           */
  30 /******************************************************************************/
  31
  32 /*
  33  * Copyright © 2008 Florent Bruneau
  34  */
  35
  36 #include "file.h"
  37 #include "filter.h"
  38 #include "config.h"
  39
  40 struct config_t {
  41     filter_t *filters;
  42     int filters_len;
  43     int filters_size;
  44
  45     int entry_point;
  46 };
  47
  48 static inline config_t *config_new(void)
  49 {
  50     config_t *config = p_new(config_t, 1);
  51     config->entry_point = -1;
  52     return config;
  53 }
  54
  55 void config_delete(config_t **config)
  56 {
  57     if (*config) {
  58         for (int i = 0 ; i < (*config)->filters_len ; ++i) {
  59             filter_wipe((*config)->filters + i);
  60         }
  61         p_delete(&(*config)->filters);
  62     }
  63 }
  64
  65 config_t *config_read(const char *file)
  66 {
  67     config_t *config;
  68     //filter_t *filter = NULL;
  69     file_map_t map;
  70     const char *p;
  71     int line = 0;
  72     const char *linep;
  73
  74     char key[BUFSIZ];
  75     char value[BUFSIZ];
  76     ssize_t key_len, value_len;
  77
  78     if (!file_map_open(&map, file, false)) {
  79         return false;
  80     }
  81
  82     config = config_new();
  83     linep = p = map.map;
  84
  85 #define READ_ERROR(Fmt, ...)                                                   \
  86     syslog(LOG_ERR, "config file %s:%d:%d: " Fmt, file, line + 1,              \
  87            p - linep + 1, ##__VA_ARGS__)
  88 #define ADD_IN_BUFFER(Buffer, Len, Char)                                       \
  89     if ((Len) >= BUFSIZ - 1) {                                                 \
  90         READ_ERROR("unreasonnable long line");                                 \
  91         goto error;                                                            \
  92     }                                                                          \
  93     (Buffer)[(Len)++] = (Char);                                                \
  94     (Buffer)[(Len)]   = '\0';
  95
  96 #define READ_NEXT(OnEOF)                                                       \
  97     if (*p == '\n') {                                                          \
  98         ++line;                                                                \
  99         linep = p + 1;                                                         \
 100     }                                                                          \
 101     if (++p >= map.end) {                                                      \
 102         OnEOF;                                                                 \
 103     }                                                                          \
 104     syslog(LOG_ERR, "Read char '%c' at %d", *p, __LINE__);
 105 #define READ_BLANK(OnEOF)                                                      \
 106     do {                                                                       \
 107         bool in_comment = false;                                               \
 108         while (in_comment || isspace(*p) || *p == '#') {                       \
 109             if (*p == '\n') {                                                  \
 110                 in_comment = false;                                            \
 111             } else if (*p == '#') {                                            \
 112                 in_comment = true;                                             \
 113             }                                                                  \
 114             READ_NEXT(OnEOF);                                                  \
 115         }                                                                      \
 116     } while (0)
 117 #define READ_TOKEN(Name, Buffer, Len)                                          \
 118     do {                                                                       \
 119         (Len) = 0;                                                             \
 120         (Buffer)[0] = '\0';                                                    \
 121         if (!isalpha(*p)) {                                                    \
 122             READ_ERROR("invalid %s, unexpected character '%c'", Name, *p);     \
 123             goto error;                                                        \
 124         }                                                                      \
 125         do {                                                                   \
 126             ADD_IN_BUFFER(Buffer, Len, *p);                                    \
 127             READ_NEXT(goto badeof)                                             \
 128         } while (isalnum(*p) || *p == '_');                                    \
 129     } while (0)
 130 #define READ_STRING(Name, Buffer, Len, OnEOF)                                  \
 131     do {                                                                       \
 132         (Len) = 0;                                                             \
 133         (Buffer)[0] = '\0';                                                    \
 134         if (*p == '"') {                                                       \
 135             bool escaped = false;                                              \
 136             while (*p == '"') {                                                \
 137                 READ_NEXT(goto badeof);                                        \
 138                 while (true) {                                                 \
 139                     if (*p == '\n') {                                          \
 140                         READ_ERROR("string must not contain EOL");             \
 141                         goto error;                                            \
 142                     } else if (escaped) {                                      \
 143                         ADD_IN_BUFFER(Buffer, Len, *p);                        \
 144                         escaped = false;                                       \
 145                     } else if (*p == '\\') {                                   \
 146                         escaped = true;                                        \
 147                     } else if (*p == '"') {                                    \
 148                         READ_NEXT(goto badeof);                                \
 149                         break;                                                 \
 150                     } else {                                                   \
 151                         ADD_IN_BUFFER(Buffer, Len, *p);                        \
 152                     }                                                          \
 153                     READ_NEXT(goto badeof);                                    \
 154                 }                                                              \
 155                 READ_BLANK(goto badeof);                                       \
 156             }                                                                  \
 157             if (*p != ';') {                                                   \
 158                 READ_ERROR("%s must end with a ';'", Name);                    \
 159                 goto error;                                                    \
 160             }                                                                  \
 161         } else {                                                               \
 162             bool escaped = false;                                              \
 163             while (*p != ';' && isascii(*p) && (isprint(*p) || isspace(*p))) { \
 164                 if (escaped) {                                                 \
 165                     if (*p == '\r' || *p == '\n') {                            \
 166                         READ_BLANK(goto badeof);                               \
 167                     } else {                                                   \
 168                         ADD_IN_BUFFER(Buffer, Len, '\\');                      \
 169                     }                                                          \
 170                     escaped = false;                                           \
 171                 }                                                              \
 172                 if (*p == '\\') {                                              \
 173                     escaped = true;                                            \
 174                 } else if (*p == '\r' || *p == '\n') {                         \
 175                     READ_ERROR("%s must not contain EOL", Name);               \
 176                 } else {                                                       \
 177                     ADD_IN_BUFFER(Buffer, Len, *p);                            \
 178                 }                                                              \
 179                 READ_NEXT(goto badeof);                                        \
 180             }                                                                  \
 181             if (escaped) {                                                     \
 182                 ADD_IN_BUFFER(Buffer, Len, '\\');                              \
 183             }                                                                  \
 184         }                                                                      \
 185         READ_NEXT(OnEOF)                                                       \
 186         syslog(LOG_ERR, "string read: %s", Buffer);                            \
 187     } while(0)
 188
 189
 190 read_section:
 191     syslog(LOG_ERR, "read_section");
 192     if (p >= map.end) {
 193         goto ok;
 194     }
 195
 196     value[0] = key[0] = '\0';
 197     value_len = key_len = 0;
 198
 199     READ_BLANK(goto ok);
 200     READ_TOKEN("section name", key, key_len);
 201     READ_BLANK(goto badeof);
 202     switch (*p) {
 203       case '=':
 204         READ_NEXT(goto badeof)
 205         goto read_param_value;
 206       case '{':
 207         READ_NEXT(goto badeof)
 208         goto read_filter;
 209       default:
 210         READ_ERROR("invalid character '%c', expected '=' or '{'", *p);
 211         goto error;
 212     }
 213
 214 read_param_value:
 215     syslog(LOG_ERR, "read_param_value: key=%s", key);
 216     READ_BLANK(goto badeof);
 217     READ_STRING("parameter value", value, value_len, ;);
 218     /* TODO: Insert parameter in the configuration.
 219      */
 220     goto read_section;
 221
 222 read_filter:
 223     syslog(LOG_ERR, "read_filter: key=%s", key);
 224     /* TODO: Create a filter with the given name.
 225      */
 226     READ_BLANK(goto badeof);
 227     while (*p != '}') {
 228         READ_TOKEN("filter parameter name", key, key_len);
 229         syslog(LOG_ERR, "read parameter: key=%s", key);
 230         READ_BLANK(goto badeof);
 231         if (*p != '=') {
 232             READ_ERROR("invalid character '%c', expected '='", *p);
 233             goto error;
 234         }
 235         READ_NEXT(goto badeof);
 236         READ_BLANK(goto badeof);
 237         READ_STRING("filter parameter value", value, value_len, goto badeof);
 238         READ_BLANK(goto badeof);
 239         /* TODO: Insert parameter in the filter.
 240          */
 241     }
 242     READ_NEXT(;)
 243     /* TODO: Check the filter.
 244      */
 245     goto read_section;
 246
 247 ok:
 248     return config;
 249
 250 badeof:
 251     syslog(LOG_ERR, "Unexpected end of file");
 252
 253 error:
 254     config_delete(&config);
 255     return NULL;
 256 }