| 1 | #include "stralloc.h" |
| 2 | #include "str.h" |
| 3 | #include "env.h" |
| 4 | #include "sig.h" |
| 5 | #include "slurp.h" |
| 6 | #include "getconf.h" |
| 7 | #include "strerr.h" |
| 8 | #include "byte.h" |
| 9 | #include "case.h" |
| 10 | #include "getln.h" |
| 11 | #include "substdio.h" |
| 12 | #include "error.h" |
| 13 | #include "quote.h" |
| 14 | #include "readwrite.h" |
| 15 | #include "fmt.h" |
| 16 | #include "now.h" |
| 17 | #include "cookie.h" |
| 18 | #include "subscribe.h" |
| 19 | #include "issub.h" |
| 20 | |
| 21 | #define FATAL "ezmlm-return: fatal: " |
| 22 | void die_usage() { strerr_die1x(100,"ezmlm-return: usage: ezmlm-return dir"); } |
| 23 | void die_nomem() { strerr_die2x(111,FATAL,"out of memory"); } |
| 24 | void die_badaddr() |
| 25 | { |
| 26 | strerr_die2x(100,FATAL,"I do not accept messages at this address (#5.1.1)"); |
| 27 | } |
| 28 | void die_trash() |
| 29 | { |
| 30 | strerr_die1x(0,"ezmlm-return: info: trash address"); |
| 31 | } |
| 32 | |
| 33 | char outbuf[1024]; |
| 34 | substdio ssout; |
| 35 | char inbuf[1024]; |
| 36 | substdio ssin; |
| 37 | |
| 38 | char strnum[FMT_ULONG]; |
| 39 | char hash[COOKIE]; |
| 40 | char hashcopy[COOKIE]; |
| 41 | unsigned long cookiedate; |
| 42 | stralloc fndate = {0}; |
| 43 | stralloc fndatenew = {0}; |
| 44 | stralloc fnhash = {0}; |
| 45 | stralloc fnhashnew = {0}; |
| 46 | |
| 47 | stralloc quoted = {0}; |
| 48 | char *sender; |
| 49 | |
| 50 | void die_hashnew() |
| 51 | { strerr_die4sys(111,FATAL,"unable to write ",fnhashnew.s,": "); } |
| 52 | void die_datenew() |
| 53 | { strerr_die4sys(111,FATAL,"unable to write ",fndatenew.s,": "); } |
| 54 | void die_msgin() |
| 55 | { strerr_die2sys(111,FATAL,"unable to read input: "); } |
| 56 | |
| 57 | void dowit(addr,when,bounce) |
| 58 | char *addr; |
| 59 | unsigned long when; |
| 60 | stralloc *bounce; |
| 61 | { |
| 62 | int fd; |
| 63 | |
| 64 | if (!issub(addr)) return; |
| 65 | |
| 66 | if (!stralloc_copys(&fndate,"bounce/w")) die_nomem(); |
| 67 | if (!stralloc_catb(&fndate,strnum,fmt_ulong(strnum,when))) die_nomem(); |
| 68 | if (!stralloc_cats(&fndate,".")) die_nomem(); |
| 69 | if (!stralloc_catb(&fndate,strnum,fmt_ulong(strnum,(unsigned long) getpid()))) die_nomem(); |
| 70 | if (!stralloc_0(&fndate)) die_nomem(); |
| 71 | if (!stralloc_copy(&fndatenew,&fndate)) die_nomem(); |
| 72 | fndatenew.s[7] = 'W'; |
| 73 | |
| 74 | fd = open_trunc(fndatenew.s); |
| 75 | if (fd == -1) die_datenew(); |
| 76 | substdio_fdbuf(&ssout,write,fd,outbuf,sizeof(outbuf)); |
| 77 | if (substdio_puts(&ssout,addr) == -1) die_datenew(); |
| 78 | if (substdio_put(&ssout,"",1) == -1) die_datenew(); |
| 79 | if (substdio_puts(&ssout,"Return-Path: <") == -1) die_datenew(); |
| 80 | if (!quote2("ed,sender)) die_nomem(); |
| 81 | if (substdio_put(&ssout,quoted.s,quoted.len) == -1) die_datenew(); |
| 82 | if (substdio_puts(&ssout,">\n") == -1) die_datenew(); |
| 83 | if (substdio_put(&ssout,bounce->s,bounce->len) == -1) die_datenew(); |
| 84 | if (substdio_flush(&ssout) == -1) die_datenew(); |
| 85 | if (fsync(fd) == -1) die_datenew(); |
| 86 | if (close(fd) == -1) die_datenew(); /* NFS stupidity */ |
| 87 | |
| 88 | if (rename(fndatenew.s,fndate.s) == -1) |
| 89 | strerr_die6sys(111,FATAL,"unable to rename ",fndatenew.s," to ",fndate.s,": "); |
| 90 | } |
| 91 | |
| 92 | void doit(addr,msgnum,when,bounce) |
| 93 | char *addr; |
| 94 | unsigned long msgnum; |
| 95 | unsigned long when; |
| 96 | stralloc *bounce; |
| 97 | { |
| 98 | int fd; |
| 99 | int fdnew; |
| 100 | |
| 101 | if (!issub(addr)) return; |
| 102 | |
| 103 | if (!stralloc_copys(&fndate,"bounce/d")) die_nomem(); |
| 104 | if (!stralloc_catb(&fndate,strnum,fmt_ulong(strnum,when))) die_nomem(); |
| 105 | if (!stralloc_cats(&fndate,".")) die_nomem(); |
| 106 | if (!stralloc_catb(&fndate,strnum,fmt_ulong(strnum,(unsigned long) getpid()))) die_nomem(); |
| 107 | if (!stralloc_0(&fndate)) die_nomem(); |
| 108 | if (!stralloc_copy(&fndatenew,&fndate)) die_nomem(); |
| 109 | fndatenew.s[7] = 'D'; |
| 110 | |
| 111 | fd = open_trunc(fndatenew.s); |
| 112 | if (fd == -1) die_datenew(); |
| 113 | substdio_fdbuf(&ssout,write,fd,outbuf,sizeof(outbuf)); |
| 114 | if (substdio_puts(&ssout,addr) == -1) die_datenew(); |
| 115 | if (substdio_put(&ssout,"",1) == -1) die_datenew(); |
| 116 | if (substdio_puts(&ssout,"Return-Path: <") == -1) die_datenew(); |
| 117 | if (!quote2("ed,sender)) die_nomem(); |
| 118 | if (substdio_put(&ssout,quoted.s,quoted.len) == -1) die_datenew(); |
| 119 | if (substdio_puts(&ssout,">\n") == -1) die_datenew(); |
| 120 | if (substdio_put(&ssout,bounce->s,bounce->len) == -1) die_datenew(); |
| 121 | if (substdio_flush(&ssout) == -1) die_datenew(); |
| 122 | if (fsync(fd) == -1) die_datenew(); |
| 123 | if (close(fd) == -1) die_datenew(); /* NFS stupidity */ |
| 124 | |
| 125 | cookie(hash,"",0,"",addr,""); |
| 126 | if (!stralloc_copys(&fnhash,"bounce/h")) die_nomem(); |
| 127 | if (!stralloc_catb(&fnhash,hash,COOKIE)) die_nomem(); |
| 128 | if (!stralloc_0(&fnhash)) die_nomem(); |
| 129 | if (!stralloc_copy(&fnhashnew,&fnhash)) die_nomem(); |
| 130 | fnhashnew.s[7] = 'H'; |
| 131 | |
| 132 | fdnew = open_trunc(fnhashnew.s); |
| 133 | if (fdnew == -1) die_hashnew(); |
| 134 | substdio_fdbuf(&ssout,write,fdnew,outbuf,sizeof(outbuf)); |
| 135 | |
| 136 | fd = open_read(fnhash.s); |
| 137 | if (fd == -1) { |
| 138 | if (errno != error_noent) |
| 139 | strerr_die4sys(111,FATAL,"unable to read ",fnhash.s,": "); |
| 140 | if (rename(fndatenew.s,fndate.s) == -1) |
| 141 | strerr_die6sys(111,FATAL,"unable to rename ",fndatenew.s," to ",fndate.s,": "); |
| 142 | } |
| 143 | else { |
| 144 | substdio_fdbuf(&ssin,read,fd,inbuf,sizeof(inbuf)); |
| 145 | switch(substdio_copy(&ssout,&ssin)) { |
| 146 | case -2: die_msgin(); |
| 147 | case -3: die_hashnew(); |
| 148 | } |
| 149 | close(fd); |
| 150 | if (unlink(fndatenew.s) == -1) |
| 151 | strerr_die4sys(111,FATAL,"unable to unlink ",fndatenew.s,": "); |
| 152 | } |
| 153 | if (substdio_puts(&ssout," ") == -1) die_hashnew(); |
| 154 | if (substdio_put(&ssout,strnum,fmt_ulong(strnum,msgnum)) == -1) die_hashnew(); |
| 155 | if (substdio_puts(&ssout,"\n") == -1) die_hashnew(); |
| 156 | if (substdio_flush(&ssout) == -1) die_hashnew(); |
| 157 | if (fsync(fdnew) == -1) die_hashnew(); |
| 158 | if (close(fdnew) == -1) die_hashnew(); /* NFS stupidity */ |
| 159 | |
| 160 | if (rename(fnhashnew.s,fnhash.s) == -1) |
| 161 | strerr_die6sys(111,FATAL,"unable to rename ",fnhashnew.s," to ",fnhash.s,": "); |
| 162 | } |
| 163 | |
| 164 | stralloc bounce = {0}; |
| 165 | stralloc line = {0}; |
| 166 | stralloc header = {0}; |
| 167 | stralloc intro = {0}; |
| 168 | stralloc failure = {0}; |
| 169 | stralloc paragraph = {0}; |
| 170 | int flaghaveheader; |
| 171 | int flaghaveintro; |
| 172 | |
| 173 | stralloc key = {0}; |
| 174 | stralloc inhost = {0}; |
| 175 | stralloc outhost = {0}; |
| 176 | stralloc inlocal = {0}; |
| 177 | stralloc outlocal = {0}; |
| 178 | |
| 179 | char msginbuf[1024]; |
| 180 | substdio ssmsgin; |
| 181 | |
| 182 | void main(argc,argv) |
| 183 | int argc; |
| 184 | char **argv; |
| 185 | { |
| 186 | char *dir; |
| 187 | char *host; |
| 188 | char *local; |
| 189 | char *action; |
| 190 | unsigned long msgnum; |
| 191 | unsigned long cookiedate; |
| 192 | unsigned long when; |
| 193 | int match; |
| 194 | int i; |
| 195 | int fdlock; |
| 196 | |
| 197 | umask(022); |
| 198 | sig_pipeignore(); |
| 199 | when = (unsigned long) now(); |
| 200 | |
| 201 | dir = argv[1]; |
| 202 | if (!dir) die_usage(); |
| 203 | |
| 204 | sender = env_get("SENDER"); |
| 205 | if (!sender) strerr_die2x(100,FATAL,"SENDER not set"); |
| 206 | local = env_get("LOCAL"); |
| 207 | if (!local) strerr_die2x(100,FATAL,"LOCAL not set"); |
| 208 | host = env_get("HOST"); |
| 209 | if (!host) strerr_die2x(100,FATAL,"HOST not set"); |
| 210 | |
| 211 | if (chdir(dir) == -1) |
| 212 | strerr_die4sys(111,FATAL,"unable to switch to ",dir,": "); |
| 213 | |
| 214 | switch(slurp("key",&key,32)) { |
| 215 | case -1: |
| 216 | strerr_die4sys(111,FATAL,"unable to read ",dir,"/key: "); |
| 217 | case 0: |
| 218 | strerr_die3x(100,FATAL,dir,"/key does not exist"); |
| 219 | } |
| 220 | getconf_line(&inhost,"inhost",1,FATAL,dir); |
| 221 | getconf_line(&inlocal,"inlocal",1,FATAL,dir); |
| 222 | getconf_line(&outhost,"outhost",1,FATAL,dir); |
| 223 | getconf_line(&outlocal,"outlocal",1,FATAL,dir); |
| 224 | |
| 225 | if (inhost.len != str_len(host)) die_badaddr(); |
| 226 | if (case_diffb(inhost.s,inhost.len,host)) die_badaddr(); |
| 227 | if (inlocal.len > str_len(local)) die_badaddr(); |
| 228 | if (case_diffb(inlocal.s,inlocal.len,local)) die_badaddr(); |
| 229 | |
| 230 | action = local + inlocal.len; |
| 231 | |
| 232 | if (!str_start(action,"-return-")) die_badaddr(); |
| 233 | action += 8; |
| 234 | |
| 235 | if (!*action) die_trash(); |
| 236 | |
| 237 | if (str_start(action,"probe-")) { |
| 238 | action += 6; |
| 239 | action += scan_ulong(action,&cookiedate); |
| 240 | if (now() - cookiedate > 3000000) die_trash(); |
| 241 | if (*action++ != '.') die_trash(); |
| 242 | i = str_chr(action,'-'); |
| 243 | if (i != COOKIE) die_trash(); |
| 244 | byte_copy(hashcopy,COOKIE,action); |
| 245 | action += COOKIE; |
| 246 | if (*action++ != '-') die_trash(); |
| 247 | i = str_rchr(action,'='); |
| 248 | if (!stralloc_copyb(&line,action,i)) die_nomem(); |
| 249 | if (action[i]) { |
| 250 | if (!stralloc_cats(&line,"@")) die_nomem(); |
| 251 | if (!stralloc_cats(&line,action + i + 1)) die_nomem(); |
| 252 | } |
| 253 | if (!stralloc_0(&line)) die_nomem(); |
| 254 | strnum[fmt_ulong(strnum,cookiedate)] = 0; |
| 255 | cookie(hash,key.s,key.len,strnum,line.s,"P"); |
| 256 | if (byte_diff(hash,COOKIE,hashcopy)) die_trash(); |
| 257 | |
| 258 | if (subscribe(line.s,0) == 1) log("-probe",line.s); |
| 259 | _exit(0); |
| 260 | } |
| 261 | |
| 262 | fdlock = open_append("lockbounce"); |
| 263 | if (fdlock == -1) |
| 264 | strerr_die4sys(111,FATAL,"unable to open ",dir,"/lockbounce: "); |
| 265 | if (lock_ex(fdlock) == -1) |
| 266 | strerr_die4sys(111,FATAL,"unable to lock ",dir,"/lockbounce: "); |
| 267 | |
| 268 | if (str_start(action,"warn-")) { |
| 269 | action += 5; |
| 270 | action += scan_ulong(action,&cookiedate); |
| 271 | if (now() - cookiedate > 3000000) die_trash(); |
| 272 | if (*action++ != '.') die_trash(); |
| 273 | i = str_chr(action,'-'); |
| 274 | if (i != COOKIE) die_trash(); |
| 275 | byte_copy(hashcopy,COOKIE,action); |
| 276 | action += COOKIE; |
| 277 | if (*action++ != '-') die_trash(); |
| 278 | i = str_rchr(action,'='); |
| 279 | if (!stralloc_copyb(&line,action,i)) die_nomem(); |
| 280 | if (action[i]) { |
| 281 | if (!stralloc_cats(&line,"@")) die_nomem(); |
| 282 | if (!stralloc_cats(&line,action + i + 1)) die_nomem(); |
| 283 | } |
| 284 | if (!stralloc_0(&line)) die_nomem(); |
| 285 | strnum[fmt_ulong(strnum,cookiedate)] = 0; |
| 286 | cookie(hash,key.s,key.len,strnum,line.s,"W"); |
| 287 | if (byte_diff(hash,COOKIE,hashcopy)) die_trash(); |
| 288 | |
| 289 | if (slurpclose(0,&bounce,1024) == -1) die_msgin(); |
| 290 | dowit(line.s,when,&bounce); |
| 291 | _exit(0); |
| 292 | } |
| 293 | |
| 294 | action += scan_ulong(action,&msgnum); |
| 295 | if (*action != '-') die_badaddr(); |
| 296 | ++action; |
| 297 | |
| 298 | if (*action) { |
| 299 | if (slurpclose(0,&bounce,1024) == -1) die_msgin(); |
| 300 | |
| 301 | i = str_rchr(action,'='); |
| 302 | if (!stralloc_copyb(&line,action,i)) die_nomem(); |
| 303 | if (action[i]) { |
| 304 | if (!stralloc_cats(&line,"@")) die_nomem(); |
| 305 | if (!stralloc_cats(&line,action + i + 1)) die_nomem(); |
| 306 | } |
| 307 | if (!stralloc_0(&line)) die_nomem(); |
| 308 | doit(line.s,msgnum,when,&bounce); |
| 309 | _exit(0); |
| 310 | } |
| 311 | |
| 312 | /* pre-VERP bounce, in QSBMF format */ |
| 313 | |
| 314 | substdio_fdbuf(&ssmsgin,read,0,msginbuf,sizeof(msginbuf)); |
| 315 | |
| 316 | flaghaveheader = 0; |
| 317 | flaghaveintro = 0; |
| 318 | |
| 319 | for (;;) { |
| 320 | if (!stralloc_copys(¶graph,"")) die_nomem(); |
| 321 | for (;;) { |
| 322 | if (getln(&ssmsgin,&line,&match,'\n') == -1) die_msgin(); |
| 323 | if (!match) die_trash(); |
| 324 | if (!stralloc_cat(¶graph,&line)) die_nomem(); |
| 325 | if (line.len <= 1) break; |
| 326 | } |
| 327 | |
| 328 | if (!flaghaveheader) { |
| 329 | if (!stralloc_copy(&header,¶graph)) die_nomem(); |
| 330 | flaghaveheader = 1; |
| 331 | continue; |
| 332 | } |
| 333 | |
| 334 | if (!flaghaveintro) { |
| 335 | if (paragraph.len < 15) die_trash(); |
| 336 | if (str_diffn(paragraph.s,"Hi. This is the",15)) die_trash(); |
| 337 | if (!stralloc_copy(&intro,¶graph)) die_nomem(); |
| 338 | flaghaveintro = 1; |
| 339 | continue; |
| 340 | } |
| 341 | |
| 342 | if (paragraph.s[0] == '-') |
| 343 | break; |
| 344 | |
| 345 | if (paragraph.s[0] == '<') { |
| 346 | if (!stralloc_copy(&failure,¶graph)) die_nomem(); |
| 347 | |
| 348 | if (!stralloc_copy(&bounce,&header)) die_nomem(); |
| 349 | if (!stralloc_cat(&bounce,&intro)) die_nomem(); |
| 350 | if (!stralloc_cat(&bounce,&failure)) die_nomem(); |
| 351 | |
| 352 | i = byte_chr(failure.s,failure.len,'\n'); |
| 353 | if (i < 3) die_trash(); |
| 354 | |
| 355 | if (!stralloc_copyb(&line,failure.s + 1,i - 3)) die_nomem(); |
| 356 | if (byte_chr(line.s,line.len,'\0') == line.len) { |
| 357 | if (!stralloc_0(&line)) die_nomem(); |
| 358 | doit(line.s,msgnum,when,&bounce); |
| 359 | } |
| 360 | } |
| 361 | } |
| 362 | |
| 363 | _exit(0); |
| 364 | } |