src/ircd_lexer.l

   1 /* src/ircd_lexer.l
   2  *
   3  *  This program is free software; you can redistribute it and/or modify
   4  *  it under the terms of the GNU General Public License as published by
   5  *  the Free Software Foundation; either version 2 of the License, or
   6  *  (at your option) any later version.
   7  *
   8  *  This program is distributed in the hope that it will be useful,
   9  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *  GNU General Public License for more details.
  12  *
  13  *  You should have received a copy of the GNU General Public License
  14  *  along with this program; if not, write to the Free Software
  15  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  16  *  USA
  17  *
  18  * $Id: ircd_lexer.l 26 2006-09-20 18:02:06Z spb $
  19  */
  20
  21 %option case-insensitive
  22 %option noyywrap
  23 %option nounput
  24
  25 %{
  26 #include <sys/types.h>
  27 #include <sys/stat.h>
  28
  29 #include <netinet/in.h>
  30
  31 #include <string.h>
  32 #include <errno.h>
  33 #include <limits.h>
  34
  35 #define WE_ARE_MEMORY_C
  36
  37 #include "stdinc.h"
  38 #include "ircd_defs.h"
  39 #include "common.h"
  40 #include "config.h"
  41 #include "s_log.h"
  42 #include "s_conf.h"
  43 #include "newconf.h"
  44
  45 #include "y.tab.h"
  46
  47 int yylex(void);
  48
  49 /* here to fixup gcc 3.3 errors */
  50 int yyget_lineno(void);
  51 FILE *yyget_in(void);
  52 FILE *yyget_out(void);
  53 int yyget_leng(void);
  54 char *yyget_text(void);
  55 void yyset_lineno(int  line_number);
  56 void yyset_in(FILE *  in_str);
  57 void yyset_out(FILE *  out_str);
  58 int yyget_debug(void);
  59 void yyset_debug(int  bdebug);
  60 int yylex_destroy(void);
  61
  62
  63 #define MAX_INCLUDE_DEPTH 10
  64
  65 YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
  66 int include_stack_ptr=0;
  67 int lineno = 1;
  68 void ccomment(void);
  69 void cinclude(void);
  70 void hashcomment(void);
  71 int ieof(void);
  72 int lineno_stack[MAX_INCLUDE_DEPTH];
  73 char conffile_stack[MAX_INCLUDE_DEPTH][IRCD_BUFSIZE];
  74 char conffilebuf[IRCD_BUFSIZE+1];
  75 char *current_file = conffilebuf;
  76
  77 FILE *inc_fbfile_in[MAX_INCLUDE_DEPTH];
  78
  79 char linebuf[512];
  80
  81 #undef YY_INPUT
  82
  83 #define YY_FATAL_ERROR(msg) conf_yy_fatal_error(msg)
  84
  85 #define YY_INPUT(buf,result,max_size) \
  86   if (!(result = conf_fgets(buf, max_size, conf_fbfile_in))) \
  87     YY_FATAL_ERROR("input in flex scanner failed");
  88 %}
  89
  90 ws        [ \t]*
  91 digit     [0-9]
  92 comment   #.*
  93 qstring   \"[^\"\n]*[\"\n]
  94 string    [a-zA-Z_\~][a-zA-Z0-9_]*
  95 include   \.include{ws}(\<.*\>|\".*\")
  96
  97 %%
  98 {include}       { cinclude(); }
  99 "/*"            { ccomment(); }
 100 \n.*            { strcpy(linebuf, yytext+1); lineno++; yyless(1); }
 101
 102 {ws}            ;
 103 {comment}       { hashcomment(); }
 104
 105 {digit}+        { yylval.number = atoi(yytext); return NUMBER; }
 106
 107 {qstring}       {
 108                   if(yytext[yyleng-2] == '\\')
 109                     {
 110                       yyless(yyleng-1); /* return last quote */
 111                       yymore();         /* append next string */
 112                     }
 113                   else
 114                     {
 115                       strcpy(yylval.string, yytext + 1);
 116                       if(yylval.string[yyleng-2] != '"')
 117                         ilog(L_MAIN, "Unterminated character string");
 118                       else
 119                         {
 120                           int i,j;
 121                           yylval.string[yyleng-2] = '\0'; /* remove close
 122                                                            *  quote
 123                                                            */
 124
 125                           for (j=i=0 ;yylval.string[i] != '\0'; i++,j++)
 126                             {
 127                               if (yylval.string[i] != '\\')
 128                                 {
 129                                   yylval.string[j] = yylval.string[i];
 130                                 }
 131                               else
 132                                 {
 133                                   i++;
 134                                   if (yylval.string[i] == '\0') /* XXX
 135                                                                  * should not
 136                                                                  * happen
 137                                                                  */
 138                                     {
 139                                       ilog(L_MAIN,
 140                                            "Unterminated character string");
 141                                       break;
 142                                     }
 143                                   yylval.string[j] = yylval.string[i];
 144                                 }
 145                             }
 146                           yylval.string[j] = '\0';
 147                           return QSTRING;
 148                         }
 149                     }
 150                 }
 151
 152
 153 loadmodule      { return LOADMODULE; }
 154 {string}        {
 155                   strcpy(yylval.string, yytext);
 156                   yylval.string[yyleng] = '\0';
 157                   return STRING;
 158                 }
 159
 160 \.\.            { return TWODOTS; }
 161 .               { return yytext[0]; }
 162 <<EOF>>         { if (ieof()) yyterminate(); }
 163 %%
 164
 165 /* C-comment ignoring routine -kre*/
 166 void ccomment()
 167 {
 168   int c;
 169
 170   /* log(L_NOTICE, "got comment"); */
 171   while (1)
 172     {
 173       while ((c = input()) != '*' && c != EOF)
 174         if (c == '\n') ++lineno;
 175       if (c == '*')
 176         {
 177           while ((c = input()) == '*');
 178           if (c == '/')
 179             break;
 180         }
 181       if (c == EOF)
 182         {
 183           YY_FATAL_ERROR("EOF in comment");
 184           /* XXX hack alert this disables
 185            * the stupid unused function warning
 186            * gcc generates
 187            */
 188           yy_fatal_error("EOF in comment");
 189           break;
 190         }
 191     }
 192 }
 193
 194 void cinclude(void)
 195 {
 196   char *c;
 197   if ((c = strchr(yytext, '<')) == NULL)
 198     *strchr(c = strchr(yytext, '"') + 1, '"') = 0;
 199   else
 200     *strchr(++c, '>') = 0;
 201
 202   /* do stacking and co. */
 203   if (include_stack_ptr >= MAX_INCLUDE_DEPTH)
 204     conf_report_error("Includes nested too deep (max is %d)", MAX_INCLUDE_DEPTH);
 205   else
 206   {
 207     FILE *tmp_fbfile_in;
 208
 209     tmp_fbfile_in = fopen(c, "r");
 210
 211     if (tmp_fbfile_in == NULL)
 212     {
 213       /* if its not found in PREFIX, look in ETCPATH */
 214       char fnamebuf[IRCD_BUFSIZE];
 215
 216       snprintf(fnamebuf, sizeof(fnamebuf), "%s/%s", ETCPATH, c);
 217       tmp_fbfile_in = fopen(fnamebuf, "r");
 218
 219       /* wasnt found there either.. error. */
 220       if(tmp_fbfile_in == NULL)
 221       {
 222         conf_report_error("Include %s: %s.", c, strerror(errno));
 223         return;
 224       }
 225     }
 226     lineno_stack[include_stack_ptr] = lineno;
 227     lineno = 1;
 228     inc_fbfile_in[include_stack_ptr] = conf_fbfile_in;
 229     strcpy(conffile_stack[include_stack_ptr], c);
 230     current_file = conffile_stack[include_stack_ptr];
 231     include_stack[include_stack_ptr++] = YY_CURRENT_BUFFER;
 232     conf_fbfile_in = tmp_fbfile_in;
 233     yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
 234   }
 235 }
 236
 237 int ieof(void)
 238 {
 239   if (include_stack_ptr)
 240     fclose(conf_fbfile_in);
 241   if (--include_stack_ptr < 0)
 242   {
 243     /* We will now exit the lexer - restore init values if we get /rehash
 244      * later and reenter lexer -kre */
 245     include_stack_ptr = 0;
 246     lineno = 1;
 247     return 1;
 248   }
 249   /* switch buffer */
 250   yy_delete_buffer(YY_CURRENT_BUFFER);
 251   lineno = lineno_stack[include_stack_ptr];
 252   conf_fbfile_in = inc_fbfile_in[include_stack_ptr];
 253
 254   if(include_stack_ptr)
 255     current_file = conffile_stack[include_stack_ptr];
 256   else
 257     current_file = conffilebuf;
 258
 259   yy_switch_to_buffer(include_stack[include_stack_ptr]);
 260   return 0;
 261 }
 262
 263 /* #-comment style, look for #include */
 264 #define INCLUDE "#include"
 265
 266 void hashcomment(void)
 267 {
 268   if (strlen(yytext) < sizeof(INCLUDE) - 1)
 269     return;
 270
 271   if (!strncasecmp(yytext, INCLUDE, sizeof(INCLUDE) - 1))
 272       yyerror("You probably meant '.include', skipping");
 273 }