| 1 | #include <stdio.h> |
| 2 | #include <sys/types.h> |
| 3 | #include <sys/stat.h> |
| 4 | #include <unistd.h> |
| 5 | #include "buffer.h" |
| 6 | #include "exit.h" |
| 7 | #include "cdb_make.h" |
| 8 | #include "open.h" |
| 9 | #include "alloc.h" |
| 10 | #include "gen_allocdefs.h" |
| 11 | #include "stralloc.h" |
| 12 | #include "getln.h" |
| 13 | #include "case.h" |
| 14 | #include "strerr.h" |
| 15 | #include "str.h" |
| 16 | #include "byte.h" |
| 17 | #include "scan.h" |
| 18 | #include "fmt.h" |
| 19 | #include "ip4.h" |
| 20 | #include "dns.h" |
| 21 | |
| 22 | #define FATAL "pickdns-data: fatal: " |
| 23 | |
| 24 | void nomem(void) |
| 25 | { |
| 26 | strerr_die2x(111,FATAL,"out of memory"); |
| 27 | } |
| 28 | |
| 29 | void ipprefix_cat(stralloc *out,char *s) |
| 30 | { |
| 31 | unsigned long u; |
| 32 | char ch; |
| 33 | unsigned int j; |
| 34 | |
| 35 | for (;;) |
| 36 | if (*s == '.') |
| 37 | ++s; |
| 38 | else { |
| 39 | j = scan_ulong(s,&u); |
| 40 | if (!j) return; |
| 41 | s += j; |
| 42 | ch = u; |
| 43 | if (!stralloc_catb(out,&ch,1)) nomem(); |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | struct address { |
| 48 | char *name; |
| 49 | unsigned int namelen; |
| 50 | char ip[4]; |
| 51 | char location[2]; |
| 52 | } ; |
| 53 | |
| 54 | int address_diff(struct address *p,struct address *q) |
| 55 | { |
| 56 | int r; |
| 57 | |
| 58 | r = byte_diff(p->location,2,q->location); |
| 59 | if (r < 0) return -1; |
| 60 | if (r > 0) return 1; |
| 61 | if (p->namelen < q->namelen) return -1; |
| 62 | if (p->namelen > q->namelen) return 1; |
| 63 | return case_diffb(p->name,p->namelen,q->name); |
| 64 | } |
| 65 | |
| 66 | void address_sort(struct address *z,unsigned int n) |
| 67 | { |
| 68 | unsigned int i; |
| 69 | unsigned int j; |
| 70 | unsigned int p; |
| 71 | unsigned int q; |
| 72 | struct address t; |
| 73 | |
| 74 | i = j = n; |
| 75 | --z; |
| 76 | |
| 77 | while (j > 1) { |
| 78 | if (i > 1) { --i; t = z[i]; } |
| 79 | else { t = z[j]; z[j] = z[i]; --j; } |
| 80 | q = i; |
| 81 | while ((p = q * 2) < j) { |
| 82 | if (address_diff(&z[p + 1],&z[p]) >= 0) ++p; |
| 83 | z[q] = z[p]; q = p; |
| 84 | } |
| 85 | if (p == j) { |
| 86 | z[q] = z[p]; q = p; |
| 87 | } |
| 88 | while ((q > i) && (address_diff(&t,&z[p = q/2]) > 0)) { |
| 89 | z[q] = z[p]; q = p; |
| 90 | } |
| 91 | z[q] = t; |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | GEN_ALLOC_typedef(address_alloc,struct address,s,len,a) |
| 96 | GEN_ALLOC_readyplus(address_alloc,struct address,s,len,a,i,n,x,30,address_alloc_readyplus) |
| 97 | GEN_ALLOC_append(address_alloc,struct address,s,len,a,i,n,x,30,address_alloc_readyplus,address_alloc_append) |
| 98 | |
| 99 | static address_alloc x; |
| 100 | |
| 101 | int fd; |
| 102 | buffer b; |
| 103 | char bspace[1024]; |
| 104 | |
| 105 | int fdcdb; |
| 106 | struct cdb_make cdb; |
| 107 | static stralloc key; |
| 108 | static stralloc result; |
| 109 | |
| 110 | static stralloc line; |
| 111 | int match = 1; |
| 112 | unsigned long linenum = 0; |
| 113 | |
| 114 | #define NUMFIELDS 3 |
| 115 | static stralloc f[NUMFIELDS]; |
| 116 | |
| 117 | char strnum[FMT_ULONG]; |
| 118 | |
| 119 | void syntaxerror(const char *why) |
| 120 | { |
| 121 | strnum[fmt_ulong(strnum,linenum)] = 0; |
| 122 | strerr_die4x(111,FATAL,"unable to parse data line ",strnum,why); |
| 123 | } |
| 124 | void die_datatmp(void) |
| 125 | { |
| 126 | strerr_die2sys(111,FATAL,"unable to create data.tmp: "); |
| 127 | } |
| 128 | |
| 129 | int main() |
| 130 | { |
| 131 | struct address t; |
| 132 | int i; |
| 133 | int j; |
| 134 | int k; |
| 135 | char ch; |
| 136 | |
| 137 | umask(022); |
| 138 | |
| 139 | if (!address_alloc_readyplus(&x,0)) nomem(); |
| 140 | |
| 141 | fd = open_read("data"); |
| 142 | if (fd == -1) strerr_die2sys(111,FATAL,"unable to open data: "); |
| 143 | buffer_init(&b,buffer_unixread,fd,bspace,sizeof bspace); |
| 144 | |
| 145 | fdcdb = open_trunc("data.tmp"); |
| 146 | if (fdcdb == -1) die_datatmp(); |
| 147 | if (cdb_make_start(&cdb,fdcdb) == -1) die_datatmp(); |
| 148 | |
| 149 | while (match) { |
| 150 | ++linenum; |
| 151 | if (getln(&b,&line,&match,'\n') == -1) |
| 152 | strerr_die2sys(111,FATAL,"unable to read line: "); |
| 153 | |
| 154 | while (line.len) { |
| 155 | ch = line.s[line.len - 1]; |
| 156 | if ((ch != ' ') && (ch != '\t') && (ch != '\n')) break; |
| 157 | --line.len; |
| 158 | } |
| 159 | if (!line.len) continue; |
| 160 | |
| 161 | j = 1; |
| 162 | for (i = 0;i < NUMFIELDS;++i) { |
| 163 | if (j >= line.len) { |
| 164 | if (!stralloc_copys(&f[i],"")) nomem(); |
| 165 | } |
| 166 | else { |
| 167 | k = byte_chr(line.s + j,line.len - j,':'); |
| 168 | if (!stralloc_copyb(&f[i],line.s + j,k)) nomem(); |
| 169 | j += k + 1; |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | switch(line.s[0]) { |
| 174 | default: |
| 175 | syntaxerror(": unrecognized leading character"); |
| 176 | case '#': |
| 177 | break; |
| 178 | case '-': |
| 179 | break; |
| 180 | case '+': |
| 181 | byte_zero(&t,sizeof t); |
| 182 | if (!dns_domain_fromdot(&t.name,f[0].s,f[0].len)) nomem(); |
| 183 | t.namelen = dns_domain_length(t.name); |
| 184 | case_lowerb(t.name,t.namelen); |
| 185 | if (!stralloc_0(&f[1])) nomem(); |
| 186 | if (!ip4_scan(f[1].s,t.ip)) syntaxerror(": malformed IP address"); |
| 187 | if (!stralloc_0(&f[2])) nomem(); |
| 188 | if (!stralloc_0(&f[2])) nomem(); |
| 189 | byte_copy(t.location,2,f[2].s); |
| 190 | if (!address_alloc_append(&x,&t)) nomem(); |
| 191 | break; |
| 192 | case '%': |
| 193 | if (!stralloc_0(&f[0])) nomem(); |
| 194 | if (!stralloc_0(&f[0])) nomem(); |
| 195 | if (!stralloc_copyb(&result,f[0].s,2)) nomem(); |
| 196 | if (!stralloc_0(&f[1])) nomem(); |
| 197 | if (!stralloc_copys(&key,"%")) nomem(); |
| 198 | ipprefix_cat(&key,f[1].s); |
| 199 | if (cdb_make_add(&cdb,key.s,key.len,result.s,result.len) == -1) |
| 200 | die_datatmp(); |
| 201 | break; |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | close(fd); |
| 206 | address_sort(x.s,x.len); |
| 207 | |
| 208 | i = 0; |
| 209 | while (i < x.len) { |
| 210 | for (j = i + 1;j < x.len;++j) |
| 211 | if (address_diff(x.s + i,x.s + j)) |
| 212 | break; |
| 213 | if (!stralloc_copys(&key,"+")) nomem(); |
| 214 | if (!stralloc_catb(&key,x.s[i].location,2)) nomem(); |
| 215 | if (!stralloc_catb(&key,x.s[i].name,x.s[i].namelen)) nomem(); |
| 216 | if (!stralloc_copys(&result,"")) nomem(); |
| 217 | while (i < j) |
| 218 | if (!stralloc_catb(&result,x.s[i++].ip,4)) nomem(); |
| 219 | if (cdb_make_add(&cdb,key.s,key.len,result.s,result.len) == -1) |
| 220 | die_datatmp(); |
| 221 | } |
| 222 | |
| 223 | if (cdb_make_finish(&cdb) == -1) die_datatmp(); |
| 224 | if (fsync(fdcdb) == -1) die_datatmp(); |
| 225 | if (close(fdcdb) == -1) die_datatmp(); /* NFS stupidity */ |
| 226 | if (rename("data.tmp","data.cdb") == -1) |
| 227 | strerr_die2sys(111,FATAL,"unable to move data.tmp to data.cdb: "); |
| 228 | |
| 229 | _exit(0); |
| 230 | } |