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     do {                                                                       \
  87         syslog(LOG_ERR, "config file %s:%d:%d: " Fmt, file, line + 1,          \
  88                p - linep + 1, ##__VA_ARGS__);                                  \
  89         goto error;                                                            \
  90     } while (0)
  91 #define ADD_IN_BUFFER(Buffer, Len, Char)                                       \
  92     do {                                                                       \
  93         if ((Len) >= BUFSIZ - 1) {                                             \
  94             READ_ERROR("unreasonnable long line");                             \
  95         }                                                                      \
  96         (Buffer)[(Len)++] = (Char);                                            \
  97         (Buffer)[(Len)]   = '\0';                                              \
  98     } while (0)
  99 #define READ_NEXT(OnEOF)                                                       \
 100     do {                                                                       \
 101         if (*p == '\n') {                                                      \
 102             ++line;                                                            \
 103             linep = p + 1;                                                     \
 104         }                                                                      \
 105         if (++p >= map.end) {                                                  \
 106             OnEOF;                                                             \
 107         }                                                                      \
 108     } while (0)
 109 #define READ_BLANK(OnEOF)                                                      \
 110     do {                                                                       \
 111         bool in_comment = false;                                               \
 112         while (in_comment || isspace(*p) || *p == '#') {                       \
 113             if (*p == '\n') {                                                  \
 114                 in_comment = false;                                            \
 115             } else if (*p == '#') {                                            \
 116                 in_comment = true;                                             \
 117             }                                                                  \
 118             READ_NEXT(OnEOF);                                                  \
 119         }                                                                      \
 120     } while (0)
 121 #define READ_TOKEN(Name, Buffer, Len)                                          \
 122     do {                                                                       \
 123         (Len) = 0;                                                             \
 124         (Buffer)[0] = '\0';                                                    \
 125         if (!isalpha(*p)) {                                                    \
 126             READ_ERROR("invalid %s, unexpected character '%c'", Name, *p);     \
 127         }                                                                      \
 128         do {                                                                   \
 129             ADD_IN_BUFFER(Buffer, Len, *p);                                    \
 130             READ_NEXT(goto badeof);                                            \
 131         } while (isalnum(*p) || *p == '_');                                    \
 132     } while (0)
 133 #define READ_STRING(Name, Buffer, Len, OnEOF)                                  \
 134     do {                                                                       \
 135         (Len) = 0;                                                             \
 136         (Buffer)[0] = '\0';                                                    \
 137         if (*p == '"') {                                                       \
 138             bool escaped = false;                                              \
 139             while (*p == '"') {                                                \
 140                 READ_NEXT(goto badeof);                                        \
 141                 while (true) {                                                 \
 142                     if (*p == '\n') {                                          \
 143                         READ_ERROR("string must not contain EOL");             \
 144                     } else if (escaped) {                                      \
 145                         ADD_IN_BUFFER(Buffer, Len, *p);                        \
 146                         escaped = false;                                       \
 147                     } else if (*p == '\\') {                                   \
 148                         escaped = true;                                        \
 149                     } else if (*p == '"') {                                    \
 150                         READ_NEXT(goto badeof);                                \
 151                         break;                                                 \
 152                     } else {                                                   \
 153                         ADD_IN_BUFFER(Buffer, Len, *p);                        \
 154                     }                                                          \
 155                     READ_NEXT(goto badeof);                                    \
 156                 }                                                              \
 157                 READ_BLANK(goto badeof);                                       \
 158             }                                                                  \
 159             if (*p != ';') {                                                   \
 160                 READ_ERROR("%s must end with a ';'", Name);                    \
 161             }                                                                  \
 162         } else {                                                               \
 163             bool escaped = false;                                              \
 164             while (*p != ';' && isascii(*p) && (isprint(*p) || isspace(*p))) { \
 165                 if (escaped) {                                                 \
 166                     if (*p == '\r' || *p == '\n') {                            \
 167                         READ_BLANK(goto badeof);                               \
 168                     } else {                                                   \
 169                         ADD_IN_BUFFER(Buffer, Len, '\\');                      \
 170                     }                                                          \
 171                     escaped = false;                                           \
 172                 }                                                              \
 173                 if (*p == '\\') {                                              \
 174                     escaped = true;                                            \
 175                 } else if (*p == '\r' || *p == '\n') {                         \
 176                     READ_ERROR("%s must not contain EOL", Name);               \
 177                 } else {                                                       \
 178                     ADD_IN_BUFFER(Buffer, Len, *p);                            \
 179                 }                                                              \
 180                 READ_NEXT(goto badeof);                                        \
 181             }                                                                  \
 182             if (escaped) {                                                     \
 183                 ADD_IN_BUFFER(Buffer, Len, '\\');                              \
 184             }                                                                  \
 185         }                                                                      \
 186         READ_NEXT(OnEOF);                                                      \
 187     } while(0)
 188
 189
 190 read_section:
 191     if (p >= map.end) {
 192         goto ok;
 193     }
 194
 195     value[0] = key[0] = '\0';
 196     value_len = key_len = 0;
 197
 198     READ_BLANK(goto ok);
 199     READ_TOKEN("section name", key, key_len);
 200     READ_BLANK(goto badeof);
 201     switch (*p) {
 202       case '=':
 203         READ_NEXT(goto badeof);
 204         goto read_param_value;
 205       case '{':
 206         READ_NEXT(goto badeof);
 207         goto read_filter;
 208       default:
 209         READ_ERROR("invalid character '%c', expected '=' or '{'", *p);
 210     }
 211
 212 read_param_value:
 213     READ_BLANK(goto badeof);
 214     READ_STRING("parameter value", value, value_len, ;);
 215     /* TODO: Insert parameter in the configuration.
 216      */
 217     goto read_section;
 218
 219 read_filter:
 220     /* TODO: Create a filter with the given name.
 221      */
 222     READ_BLANK(goto badeof);
 223     while (*p != '}') {
 224         READ_TOKEN("filter parameter name", key, key_len);
 225         READ_BLANK(goto badeof);
 226         if (*p != '=') {
 227             READ_ERROR("invalid character '%c', expected '='", *p);
 228         }
 229         READ_NEXT(goto badeof);
 230         READ_BLANK(goto badeof);
 231         READ_STRING("filter parameter value", value, value_len, goto badeof);
 232         READ_BLANK(goto badeof);
 233         /* TODO: Insert parameter in the filter.
 234          */
 235     }
 236     READ_NEXT(;);
 237     /* TODO: Check the filter.
 238      */
 239     goto read_section;
 240
 241 ok:
 242     return config;
 243
 244 badeof:
 245     syslog(LOG_ERR, "Unexpected end of file");
 246
 247 error:
 248     config_delete(&config);
 249     return NULL;
 250 }