| 1 | /*$Id: issub.c,v 1.4 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 "open.h" |
| 8 | #include "byte.h" |
| 9 | #include "case.h" |
| 10 | #include "strerr.h" |
| 11 | #include "error.h" |
| 12 | #include "uint32.h" |
| 13 | #include "fmt.h" |
| 14 | #include "subscribe.h" |
| 15 | #include "errtxt.h" |
| 16 | |
| 17 | static void die_nomem(fatal) |
| 18 | char *fatal; |
| 19 | { |
| 20 | strerr_die2x(111,fatal,ERR_NOMEM); |
| 21 | } |
| 22 | |
| 23 | static stralloc addr = {0}; |
| 24 | static stralloc lcaddr = {0}; |
| 25 | static stralloc line = {0}; |
| 26 | static stralloc quoted = {0}; |
| 27 | static stralloc fn = {0}; |
| 28 | static substdio ss; |
| 29 | static char ssbuf[512]; |
| 30 | static char szh[FMT_ULONG]; |
| 31 | |
| 32 | char *issub(dbname,userhost,tab,fatal) |
| 33 | /* Returns (char *) to match if userhost is in the subscriber database */ |
| 34 | /* dbname, 0 otherwise. dbname is a base directory for a list and may NOT */ |
| 35 | /* be NULL */ |
| 36 | /* NOTE: The returned pointer is NOT VALID after a subsequent call to issub!*/ |
| 37 | |
| 38 | char *dbname; /* directory to basedir */ |
| 39 | char *userhost; |
| 40 | char *tab; /* override table name */ |
| 41 | char *fatal; |
| 42 | |
| 43 | { |
| 44 | |
| 45 | int fd; |
| 46 | unsigned int j; |
| 47 | uint32 h,lch; |
| 48 | char ch,lcch; |
| 49 | int match; |
| 50 | |
| 51 | if (!stralloc_copys(&addr,"T")) die_nomem(fatal); |
| 52 | if (!stralloc_cats(&addr,userhost)) die_nomem(fatal); |
| 53 | |
| 54 | j = byte_rchr(addr.s,addr.len,'@'); |
| 55 | if (j == addr.len) return (char *) 0; |
| 56 | case_lowerb(addr.s + j + 1,addr.len - j - 1); |
| 57 | if (!stralloc_copy(&lcaddr,&addr)) die_nomem(fatal); |
| 58 | case_lowerb(lcaddr.s + 1,j - 1); /* totally lc version of addr */ |
| 59 | |
| 60 | h = 5381; |
| 61 | lch = h; /* make hash for both for backwards comp */ |
| 62 | for (j = 0;j < addr.len;++j) { /* (lcaddr.len == addr.len) */ |
| 63 | h = (h + (h << 5)) ^ (uint32) (unsigned char) addr.s[j]; |
| 64 | lch = (lch + (lch << 5)) ^ (uint32) (unsigned char) lcaddr.s[j]; |
| 65 | } |
| 66 | ch = 64 + (h % 53); |
| 67 | lcch = 64 + (lch % 53); |
| 68 | |
| 69 | if (!stralloc_0(&addr)) die_nomem(fatal); |
| 70 | if (!stralloc_0(&lcaddr)) die_nomem(fatal); |
| 71 | if (!stralloc_copys(&fn,dbname)) die_nomem(fatal); |
| 72 | if (!stralloc_cats(&fn,"/subscribers/")) die_nomem(fatal); |
| 73 | if (!stralloc_catb(&fn,&lcch,1)) die_nomem(fatal); |
| 74 | if (!stralloc_0(&fn)) die_nomem(fatal); |
| 75 | |
| 76 | fd = open_read(fn.s); |
| 77 | if (fd == -1) { |
| 78 | if (errno != error_noent) |
| 79 | strerr_die4sys(111,fatal,ERR_OPEN,fn.s,": "); |
| 80 | } else { |
| 81 | substdio_fdbuf(&ss,read,fd,ssbuf,sizeof(ssbuf)); |
| 82 | |
| 83 | for (;;) { |
| 84 | if (getln(&ss,&line,&match,'\0') == -1) |
| 85 | strerr_die4sys(111,fatal,ERR_READ,fn.s,": "); |
| 86 | if (!match) break; |
| 87 | if (line.len == lcaddr.len) |
| 88 | if (!case_diffb(line.s,line.len,lcaddr.s)) |
| 89 | { close(fd); return line.s+1; } |
| 90 | } |
| 91 | |
| 92 | close(fd); |
| 93 | } |
| 94 | /* here if file not found or (file found && addr not there) */ |
| 95 | |
| 96 | if (ch == lcch) return (char *) 0; |
| 97 | |
| 98 | /* try case sensitive hash for backwards compatibility */ |
| 99 | fn.s[fn.len - 2] = ch; |
| 100 | fd = open_read(fn.s); |
| 101 | if (fd == -1) { |
| 102 | if (errno != error_noent) |
| 103 | strerr_die4sys(111,fatal,ERR_OPEN,fn.s,": "); |
| 104 | return (char *) 0; |
| 105 | } |
| 106 | substdio_fdbuf(&ss,read,fd,ssbuf,sizeof(ssbuf)); |
| 107 | |
| 108 | for (;;) { |
| 109 | if (getln(&ss,&line,&match,'\0') == -1) |
| 110 | strerr_die4sys(111,fatal,ERR_READ,fn.s,": "); |
| 111 | if (!match) break; |
| 112 | if (line.len == addr.len) |
| 113 | if (!case_diffb(line.s,line.len,addr.s)) |
| 114 | { close(fd); return line.s+1; } |
| 115 | } |
| 116 | |
| 117 | close(fd); |
| 118 | |
| 119 | return (char *) 0; |
| 120 | } |