mdw@git.distorted.org.uk Git - fastforward/blob - newaliases.c

   1 #include "substdio.h"
   2 #include "strerr.h"
   3 #include "stralloc.h"
   4 #include "getln.h"
   5 #include "open.h"
   6 #include "readwrite.h"
   7 #include "token822.h"
   8 #include "control.h"
   9 #include "auto_qmail.h"
  10 #include "case.h"
  11 #include "cdbmss.h"
  12
  13 #define FATAL "newaliases: fatal: "
  14
  15 void nomem()
  16 {
  17   strerr_die2x(111,FATAL,"out of memory");
  18 }
  19 void nulbyte()
  20 {
  21   strerr_die2x(100,FATAL,"NUL bytes are not permitted");
  22 }
  23 void longaddress()
  24 {
  25   strerr_die2x(100,FATAL,"addresses over 800 bytes are not permitted");
  26 }
  27 void writeerr()
  28 {
  29   strerr_die2sys(111,FATAL,"unable to write to /etc/aliases.tmp: ");
  30 }
  31 void readerr()
  32 {
  33   strerr_die2sys(111,FATAL,"unable to read /etc/aliases: ");
  34 }
  35 void die_control()
  36 {
  37   strerr_die2sys(111,FATAL,"unable to read controls: ");
  38 }
  39
  40 stralloc me = {0};
  41 stralloc defaulthost = {0};
  42 stralloc defaultdomain = {0};
  43 stralloc plusdomain = {0};
  44
  45 void readcontrols()
  46 {
  47   int r;
  48   int fddir;
  49
  50   fddir = open_read(".");
  51   if (fddir == -1)
  52     strerr_die2sys(111,FATAL,"unable to open current directory: ");
  53
  54   if (chdir(auto_qmail) == -1)
  55     strerr_die4sys(111,FATAL,"unable to chdir to ",auto_qmail,": ");
  56
  57   r = control_readline(&me,"control/me");
  58   if (r == -1) die_control();
  59   if (!r) if (!stralloc_copys(&me,"me")) nomem();
  60
  61   r = control_readline(&defaultdomain,"control/defaultdomain");
  62   if (r == -1) die_control();
  63   if (!r) if (!stralloc_copy(&defaultdomain,&me)) nomem();
  64
  65   r = control_readline(&defaulthost,"control/defaulthost");
  66   if (r == -1) die_control();
  67   if (!r) if (!stralloc_copy(&defaulthost,&me)) nomem();
  68
  69   r = control_readline(&plusdomain,"control/plusdomain");
  70   if (r == -1) die_control();
  71   if (!r) if (!stralloc_copy(&plusdomain,&me)) nomem();
  72
  73   if (fchdir(fddir) == -1)
  74     strerr_die2sys(111,FATAL,"unable to set current directory: ");
  75 }
  76
  77 stralloc target = {0};
  78 stralloc fulltarget = {0};
  79 stralloc instr = {0};
  80
  81 stralloc cbuf = {0};
  82 token822_alloc toks = {0};
  83 token822_alloc tokaddr = {0};
  84 stralloc address = {0};
  85
  86 void gotincl()
  87 {
  88   token822_reverse(&tokaddr);
  89   if (token822_unquote(&address,&tokaddr) != 1) nomem();
  90   tokaddr.len = 0;
  91
  92   if (!address.len)
  93     strerr_die2x(111,FATAL,"empty :include: filenames not permitted");
  94   if (byte_chr(address.s,address.len,'\0') < address.len)
  95     strerr_die2x(111,FATAL,"NUL not permitted in :include: filenames");
  96
  97   if ((address.s[0] != '.') && (address.s[0] != '/'))
  98     if (!stralloc_cats(&instr,"./")) nomem();
  99   if (!stralloc_cat(&instr,&address)) nomem();
 100   if (!stralloc_cats(&instr,".bin")) nomem();
 101   if (!stralloc_0(&instr)) nomem();
 102 }
 103
 104 void gotaddr()
 105 {
 106   int i;
 107   int j;
 108   int flaghasat;
 109
 110   token822_reverse(&tokaddr);
 111   if (token822_unquote(&address,&tokaddr) != 1) nomem();
 112
 113   if (!address.len)
 114     strerr_die2x(111,FATAL,"empty recipient addresses not permitted");
 115
 116   flaghasat = 0;
 117   for (i = 0;i < tokaddr.len;++i)
 118     if (tokaddr.t[i].type == TOKEN822_AT)
 119       flaghasat = 1;
 120
 121   tokaddr.len = 0;
 122
 123   if (!address.len) return;
 124
 125   if (!flaghasat)
 126     if (address.s[0] == '/') {
 127       if (!stralloc_0(&address)) nomem();
 128       strerr_die4x(111,FATAL,"file delivery ",address.s," not supported");
 129     }
 130   if (!flaghasat)
 131     if (address.s[0] == '|') {
 132       if (byte_chr(address.s,address.len,'\0') < address.len)
 133         strerr_die2x(111,FATAL,"NUL not permitted in program names");
 134       if (!stralloc_cats(&instr,"!")) nomem();
 135       if (!stralloc_catb(&instr,address.s + 1,address.len - 1)) nomem();
 136       if (!stralloc_0(&instr)) nomem();
 137       return;
 138     }
 139
 140
 141   if (target.len) {
 142     if (!stralloc_cats(&instr,"&")) nomem();
 143     if (!stralloc_cat(&instr,&fulltarget)) nomem();
 144     if (!stralloc_0(&instr)) nomem();
 145   }
 146
 147   if (!flaghasat)
 148     if (!stralloc_cats(&address,"@")) nomem();
 149
 150   if (!stralloc_copy(&target,&address)) nomem();
 151   if (!stralloc_copy(&fulltarget,&address)) nomem();
 152
 153   if (fulltarget.s[fulltarget.len - 1] == '@')
 154      if (!stralloc_cat(&fulltarget,&defaulthost)) nomem();
 155   if (fulltarget.s[fulltarget.len - 1] == '+') {
 156     fulltarget.s[fulltarget.len - 1] = '.';
 157     if (!stralloc_cat(&fulltarget,&plusdomain)) nomem();
 158   }
 159
 160   j = 0;
 161   for (i = 0;i < fulltarget.len;++i) if (fulltarget.s[i] == '@') j = i;
 162   for (i = j;i < fulltarget.len;++i) if (fulltarget.s[i] == '.') break;
 163   if (i == fulltarget.len) {
 164     if (!stralloc_cats(&fulltarget,".")) nomem();
 165     if (!stralloc_cat(&fulltarget,&defaultdomain)) nomem();
 166   }
 167
 168   if (fulltarget.len > 800) longaddress();
 169   if (byte_chr(fulltarget.s,fulltarget.len,'\0') < fulltarget.len)
 170     strerr_die2x(111,FATAL,"NUL not permitted in recipient addresses");
 171 }
 172
 173 stralloc line = {0};
 174 stralloc newline = {0};
 175 int match;
 176
 177 void parseerr()
 178 {
 179   if (!stralloc_0(&line)) nomem();
 180   strerr_die3x(111,FATAL,"unable to parse this line: ",line.s);
 181 }
 182
 183 void parseline()
 184 {
 185   int wordok;
 186   struct token822 *t;
 187   struct token822 *beginning;
 188
 189   switch(token822_parse(&toks,&line,&cbuf)) {
 190     case -1: nomem();
 191     case 0: parseerr();
 192   }
 193
 194   beginning = toks.t;
 195   t = toks.t + toks.len;
 196   wordok = 1;
 197
 198   if (!token822_readyplus(&tokaddr,1)) nomem();
 199   tokaddr.len = 0;
 200
 201   while (t > beginning)
 202     switch((--t)->type) {
 203       case TOKEN822_SEMI:
 204         break; /*XXX*/
 205       case TOKEN822_COLON:
 206         if (t >= beginning + 2)
 207           if (t[-2].type == TOKEN822_COLON)
 208             if (t[-1].type == TOKEN822_ATOM)
 209               if (t[-1].slen == 7)
 210                 if (!byte_diff(t[-1].s,7,"include")) {
 211                   gotincl();
 212                   t -= 2;
 213                 }
 214         break; /*XXX*/
 215       case TOKEN822_RIGHT:
 216         if (tokaddr.len) gotaddr();
 217         while ((t > beginning) && (t[-1].type != TOKEN822_LEFT))
 218           if (!token822_append(&tokaddr,--t)) nomem();
 219         gotaddr();
 220         if (t <= beginning) parseerr();
 221         --t;
 222         while ((t > beginning) && ((t[-1].type == TOKEN822_COMMENT) || (t[-1].type == TOKEN822_ATOM) || (t[-1].type == TOKEN822_QUOTE) || (t[-1].type == TOKEN822_AT) || (t[-1].type == TOKEN822_DOT)))
 223           --t;
 224         wordok = 0;
 225         continue;
 226       case TOKEN822_ATOM: case TOKEN822_QUOTE: case TOKEN822_LITERAL:
 227         if (!wordok) if (tokaddr.len) gotaddr();
 228         wordok = 0;
 229         if (!token822_append(&tokaddr,t)) nomem();
 230         continue;
 231       case TOKEN822_COMMENT:
 232         /* comment is lexically a space; shouldn't affect wordok */
 233         break;
 234       case TOKEN822_COMMA:
 235         if (tokaddr.len) gotaddr();
 236         wordok = 1;
 237         break;
 238       default:
 239         wordok = 1;
 240         if (!token822_append(&tokaddr,t)) nomem();
 241         continue;
 242     }
 243   if (tokaddr.len) gotaddr();
 244 }
 245
 246 char inbuf[1024];
 247 substdio ssin;
 248 struct cdbmss cdbmss;
 249 stralloc key = {0};
 250
 251 void doit()
 252 {
 253   if (!instr.len) {
 254     if (target.len) parseerr();
 255     return;
 256   }
 257
 258   if (!target.len) parseerr();
 259
 260   if (stralloc_starts(&target,"owner-")) {
 261     if (!stralloc_copys(&key,"?")) nomem();
 262     if (!stralloc_catb(&key,target.s + 6,target.len - 6)) nomem();
 263     case_lowerb(key.s,key.len);
 264     if (cdbmss_add(&cdbmss,key.s,key.len,fulltarget.s,fulltarget.len) == -1) writeerr();
 265   }
 266
 267   if (!stralloc_copys(&key,":")) nomem();
 268   if (!stralloc_cat(&key,&target)) nomem();
 269   case_lowerb(key.s,key.len);
 270   if (cdbmss_add(&cdbmss,key.s,key.len,instr.s,instr.len) == -1) writeerr();
 271 }
 272
 273 void main()
 274 {
 275   int fd;
 276
 277   umask(033);
 278   readcontrols();
 279
 280   fd = open_read("/etc/aliases");
 281   if (fd == -1) readerr();
 282   substdio_fdbuf(&ssin,read,fd,inbuf,sizeof inbuf);
 283
 284   fd = open_trunc("/etc/aliases.tmp");
 285   if (fd == -1) strerr_die2sys(111,FATAL,"unable to create /etc/aliases.tmp: ");
 286   if (cdbmss_start(&cdbmss,fd) == -1) writeerr();
 287
 288   if (!stralloc_copys(&line,"")) nomem();
 289
 290   for (;;) {
 291     if (getln(&ssin,&newline,&match,'\n') != 0) readerr();
 292
 293     if (match && (newline.s[0] == '\n')) continue;
 294
 295     if (match && ((newline.s[0] == ' ') || (newline.s[0] == '\t'))) {
 296       if (!stralloc_cat(&line,&newline)) nomem();
 297       continue;
 298     }
 299
 300     if (line.len)
 301       if (line.s[0] != '#') {
 302         if (!stralloc_copys(&target,"")) nomem();
 303         if (!stralloc_copys(&fulltarget,"")) nomem();
 304         if (!stralloc_copys(&instr,"")) nomem();
 305         parseline();
 306         doit();
 307       }
 308
 309     if (!match) break;
 310     if (!stralloc_copy(&line,&newline)) nomem();
 311   }
 312
 313   if (cdbmss_finish(&cdbmss) == -1) writeerr();
 314   if (fsync(fd) == -1) writeerr();
 315   if (close(fd) == -1) writeerr(); /* NFS stupidity */
 316
 317   if (rename("/etc/aliases.tmp","/etc/aliases.cdb") == -1)
 318     strerr_die2sys(111,FATAL,"unable to move /etc/aliases.tmp to /etc/aliases.cdb: ");
 319
 320   _exit(0);
 321 }