mdw@git.distorted.org.uk Git - ezmlm/blob - sub_std/subscribe.c

   1 /*$Id: subscribe.c,v 1.5 1999/10/12 23:38:36 lindberg Exp $*/
   2 /*$Name: ezmlm-idx-040 $*/
   3 #include "stralloc.h"
   4 #include "getln.h"
   5 #include "readwrite.h"
   6 #include "substdio.h"
   7 #include "strerr.h"
   8 #include "open.h"
   9 #include "byte.h"
  10 #include "case.h"
  11 #include "lock.h"
  12 #include "error.h"
  13 #include "subscribe.h"
  14 #include "uint32.h"
  15 #include "fmt.h"
  16 #include "errtxt.h"
  17 #include "log.h"
  18 #include "idx.h"
  19
  20 static void die_nomem(fatal)
  21 char *fatal;
  22 {
  23   strerr_die2x(111,fatal,ERR_NOMEM);
  24 }
  25
  26 static stralloc addr = {0};
  27 static stralloc lcaddr = {0};
  28 static stralloc line = {0};
  29 static stralloc domain = {0};
  30 static stralloc logline = {0};
  31 static stralloc quoted = {0};
  32 static stralloc fnnew = {0};
  33 static stralloc fn = {0};
  34 static stralloc fnlock = {0};
  35 static char szh[FMT_ULONG];
  36
  37 void die_read(fatal)
  38 char *fatal;
  39 {
  40   strerr_die4sys(111,fatal,ERR_READ,fn.s,": ");
  41 }
  42
  43 void die_write(fatal)
  44 char *fatal;
  45 {
  46   strerr_die4sys(111,fatal,ERR_WRITE,fnnew.s,": ");
  47 }
  48
  49 static int fd;
  50 static substdio ss;
  51 static char ssbuf[256];
  52 static int fdnew;
  53 static substdio ssnew;
  54 static char ssnewbuf[256];
  55
  56 int subscribe(dbname,userhost,flagadd,comment,event,flagmysql,
  57         forcehash,tab,fatal)
  58 /* add (flagadd=1) or remove (flagadd=0) userhost from the subscr. database  */
  59 /* dbname. Comment is e.g. the subscriber from line or name. It is added to  */
  60 /* the log. Event is the action type, e.g. "probe", "manual", etc. The       */
  61 /* direction (sub/unsub) is inferred from flagadd. Returns 1 on success, 0   */
  62 /* on failure. If flagmysql is set and the file "sql" is found in the        */
  63 /* directory dbname, it is parsed and a mysql db is assumed. if forcehash is */
  64 /* >=0 it is used in place of the calculated hash. This makes it possible to */
  65 /* add addresses with a hash that does not exist. forcehash has to be 0..99. */
  66 /* for unsubscribes, the address is only removed if forcehash matches the    */
  67 /* actual hash. This way, ezmlm-manage can be prevented from touching certain*/
  68 /* addresses that can only be removed by ezmlm-unsub. Usually, this would be */
  69 /* used for sublist addresses (to avoid removal) and sublist aliases (to     */
  70 /* prevent users from subscribing them (although the cookie mechanism would  */
  71 /* prevent the resulting duplicate message from being distributed. */
  72
  73 char *dbname;
  74 char *userhost;
  75 int flagadd;
  76 char *comment;
  77 char *event;
  78 int flagmysql;
  79 int forcehash;
  80 char *tab;
  81 char *fatal;
  82 {
  83   int fdlock;
  84
  85   char szhash[3] = "00";
  86
  87   unsigned int j;
  88   uint32 h,lch;
  89   unsigned char ch,lcch;
  90   int match;
  91   int flagwasthere;
  92
  93   if (userhost[str_chr(userhost,'\n')])
  94     strerr_die2x(100,fatal,ERR_ADDR_NL);
  95
  96     if (!stralloc_copys(&addr,"T")) die_nomem(fatal);
  97     if (!stralloc_cats(&addr,userhost)) die_nomem(fatal);
  98     if (addr.len > 401)
  99       strerr_die2x(100,fatal,ERR_ADDR_LONG);
 100
 101     j = byte_rchr(addr.s,addr.len,'@');
 102     if (j == addr.len)
 103       strerr_die2x(100,fatal,ERR_ADDR_AT);
 104     case_lowerb(addr.s + j + 1,addr.len - j - 1);
 105     if (!stralloc_copy(&lcaddr,&addr)) die_nomem(fatal);
 106     case_lowerb(lcaddr.s + 1,j - 1);    /* make all-lc version of address */
 107
 108     if (forcehash >= 0 && forcehash <= 52) {
 109       ch = lcch = (unsigned char) forcehash;
 110     } else {
 111       h = 5381;
 112       lch = h;
 113       for (j = 0;j < addr.len;++j) {
 114         h = (h + (h << 5)) ^ (uint32) (unsigned char) addr.s[j];
 115         lch = (lch + (lch << 5)) ^ (uint32) (unsigned char) lcaddr.s[j];
 116       }
 117       lcch = 64 + (lch % 53);
 118       ch = 64 + (h % 53);
 119     }
 120
 121     if (!stralloc_0(&addr)) die_nomem(fatal);
 122     if (!stralloc_0(&lcaddr)) die_nomem(fatal);
 123     if (!stralloc_copys(&fn,dbname)) die_nomem(fatal);
 124     if (!stralloc_copys(&fnlock,dbname)) die_nomem(fatal);
 125
 126     if (!stralloc_cats(&fn,"/subscribers/")) die_nomem(fatal);
 127     if (!stralloc_catb(&fn,&lcch,1)) die_nomem(fatal);
 128     if (!stralloc_copy(&fnnew,&fn)) die_nomem(fatal);
 129         /* code later depends on fnnew = fn + 'n' */
 130     if (!stralloc_cats(&fnnew,"n")) die_nomem(fatal);
 131     if (!stralloc_cats(&fnlock,"/lock")) die_nomem(fatal);
 132     if (!stralloc_0(&fnnew)) die_nomem(fatal);
 133     if (!stralloc_0(&fn)) die_nomem(fatal);
 134     if (!stralloc_0(&fnlock)) die_nomem(fatal);
 135
 136     fdlock = open_append(fnlock.s);
 137     if (fdlock == -1)
 138       strerr_die4sys(111,fatal,ERR_OPEN,fnlock.s,": ");
 139     if (lock_ex(fdlock) == -1)
 140       strerr_die4sys(111,fatal,ERR_OBTAIN,fnlock.s,": ");
 141
 142                                 /* do lower case hashed version first */
 143     fdnew = open_trunc(fnnew.s);
 144     if (fdnew == -1) die_write(fatal);
 145     substdio_fdbuf(&ssnew,write,fdnew,ssnewbuf,sizeof(ssnewbuf));
 146
 147     flagwasthere = 0;
 148
 149     fd = open_read(fn.s);
 150     if (fd == -1) {
 151       if (errno != error_noent) { close(fdnew); die_read(fatal); }
 152     }
 153     else {
 154       substdio_fdbuf(&ss,read,fd,ssbuf,sizeof(ssbuf));
 155
 156       for (;;) {
 157         if (getln(&ss,&line,&match,'\0') == -1) {
 158           close(fd); close(fdnew); die_read(fatal);
 159         }
 160         if (!match) break;
 161         if (line.len == addr.len)
 162           if (!case_diffb(line.s,line.len,addr.s)) {
 163             flagwasthere = 1;
 164             if (!flagadd)
 165               continue;
 166           }
 167         if (substdio_bput(&ssnew,line.s,line.len) == -1) {
 168           close(fd); close(fdnew); die_write(fatal);
 169         }
 170       }
 171
 172       close(fd);
 173     }
 174
 175     if (flagadd && !flagwasthere)
 176       if (substdio_bput(&ssnew,addr.s,addr.len) == -1) {
 177         close(fdnew); die_write(fatal);
 178       }
 179
 180     if (substdio_flush(&ssnew) == -1) { close(fdnew); die_write(fatal); }
 181     if (fsync(fdnew) == -1) { close(fdnew); die_write(fatal); }
 182     close(fdnew);
 183
 184     if (rename(fnnew.s,fn.s) == -1)
 185       strerr_die6sys(111,fatal,ERR_MOVE,fnnew.s," to ",fn.s,": ");
 186
 187     if ((ch == lcch) || flagwasthere) {
 188       close(fdlock);
 189       if (flagadd ^ flagwasthere) {
 190         if (!stralloc_0(&addr)) die_nomem(fatal);
 191         log(dbname,event,addr.s+1,comment);
 192         return 1;
 193       }
 194       return 0;
 195     }
 196
 197                         /* If unsub and not found and hashed differ, OR */
 198                         /* sub and not found (so added with new hash) */
 199                         /* do the 'case-dependent' hash */
 200
 201     fn.s[fn.len - 2] = ch;
 202     fnnew.s[fnnew.len - 3] = ch;
 203     fdnew = open_trunc(fnnew.s);
 204     if (fdnew == -1) die_write(fatal);
 205     substdio_fdbuf(&ssnew,write,fdnew,ssnewbuf,sizeof(ssnewbuf));
 206
 207     fd = open_read(fn.s);
 208     if (fd == -1) {
 209       if (errno != error_noent) { close(fdnew); die_read(fatal); }
 210     } else {
 211       substdio_fdbuf(&ss,read,fd,ssbuf,sizeof(ssbuf));
 212
 213       for (;;) {
 214         if (getln(&ss,&line,&match,'\0') == -1)
 215           { close(fd); close(fdnew); die_read(fatal); }
 216         if (!match) break;
 217         if (line.len == addr.len)
 218           if (!case_diffb(line.s,line.len,addr.s)) {
 219             flagwasthere = 1;
 220             continue;   /* always want to remove from case-sensitive hash */
 221           }
 222         if (substdio_bput(&ssnew,line.s,line.len) == -1)
 223           { close(fd); close(fdnew); die_write(fatal); }
 224       }
 225
 226       close(fd);
 227     }
 228
 229     if (substdio_flush(&ssnew) == -1) { close(fdnew); die_write(fatal); }
 230     if (fsync(fdnew) == -1) { close(fdnew); die_write(fatal); }
 231     close(fdnew);
 232
 233     if (rename(fnnew.s,fn.s) == -1)
 234       strerr_die6sys(111,fatal,ERR_MOVE,fnnew.s," to ",fn.s,": ");
 235
 236     close(fdlock);
 237     if (flagadd ^ flagwasthere) {
 238       if (!stralloc_0(&addr)) die_nomem(fatal);
 239       log(dbname,event,addr.s+1,comment);
 240       return 1;
 241     }
 242     return 0;
 243
 244 }