| 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 | } |