1 files changed, 183 insertions, 0 deletions
diff --git a/qmail-popup.c b/qmail-popup.c
new file mode 100644
index 0000000..906da67
--- /dev/null
+++ b/qmail-popup.c
@@ -0,0 +1,183 @@
+#include "commands.h"
+#include "fd.h"
+#include "sig.h"
+#include "stralloc.h"
+#include "substdio.h"
+#include "alloc.h"
+#include "wait.h"
+#include "str.h"
+#include "byte.h"
+#include "now.h"
+#include "fmt.h"
+#include "exit.h"
+#include "readwrite.h"
+#include "timeoutread.h"
+#include "timeoutwrite.h"
+
+void die() { _exit(1); }
+
+int saferead(fd,buf,len) int fd; char *buf; int len;
+{
+  int r;
+  r = timeoutread(1200,fd,buf,len);
+  if (r <= 0) die();
+  return r;
+}
+
+int safewrite(fd,buf,len) int fd; char *buf; int len;
+{
+  int r;
+  r = timeoutwrite(1200,fd,buf,len);
+  if (r <= 0) die();
+  return r;
+}
+
+char ssoutbuf[128];
+substdio ssout = SUBSTDIO_FDBUF(safewrite,1,ssoutbuf,sizeof ssoutbuf);
+
+char ssinbuf[128];
+substdio ssin = SUBSTDIO_FDBUF(saferead,0,ssinbuf,sizeof ssinbuf);
+
+void puts(s) char *s;
+{
+  substdio_puts(&ssout,s);
+}
+void flush()
+{
+  substdio_flush(&ssout);
+}
+void err(s) char *s;
+{
+  puts("-ERR ");
+  puts(s);
+  puts("\r\n");
+  flush();
+}
+
+void die_usage() { err("usage: popup hostname subprogram"); die(); }
+void die_nomem() { err("out of memory"); die(); }
+void die_pipe() { err("unable to open pipe"); die(); }
+void die_write() { err("unable to write pipe"); die(); }
+void die_fork() { err("unable to fork"); die(); }
+void die_childcrashed() { err("aack, child crashed"); }
+void die_badauth() { err("authorization failed"); }
+
+void err_syntax() { err("syntax error"); }
+void err_wantuser() { err("USER first"); }
+void err_authoriz(arg) char *arg; { err("authorization first"); }
+
+void okay(arg) char *arg; { puts("+OK \r\n"); flush(); }
+void pop3_quit(arg) char *arg; { okay(0); die(); }
+
+
+char unique[FMT_ULONG + FMT_ULONG + 3];
+char *hostname;
+stralloc username = {0};
+int seenuser = 0;
+char **childargs;
+substdio ssup;
+char upbuf[128];
+
+
+void doanddie(user,userlen,pass)
+char *user;
+unsigned int userlen; /* including 0 byte */
+char *pass;
+{
+  int child;
+  int wstat;
+  int pi[2];
+ 
+  if (fd_copy(2,1) == -1) die_pipe();
+  close(3);
+  if (pipe(pi) == -1) die_pipe();
+  if (pi[0] != 3) die_pipe();
+  switch(child = fork()) {
+    case -1:
+      die_fork();
+    case 0:
+      close(pi[1]);
+      sig_pipedefault();
+      execvp(*childargs,childargs);
+      _exit(1);
+  }
+  close(pi[0]);
+  substdio_fdbuf(&ssup,write,pi[1],upbuf,sizeof upbuf);
+  if (substdio_put(&ssup,user,userlen) == -1) die_write();
+  if (substdio_put(&ssup,pass,str_len(pass) + 1) == -1) die_write();
+  if (substdio_puts(&ssup,"<") == -1) die_write();
+  if (substdio_puts(&ssup,unique) == -1) die_write();
+  if (substdio_puts(&ssup,hostname) == -1) die_write();
+  if (substdio_put(&ssup,">",2) == -1) die_write();
+  if (substdio_flush(&ssup) == -1) die_write();
+  close(pi[1]);
+  byte_zero(pass,str_len(pass));
+  byte_zero(upbuf,sizeof upbuf);
+  if (wait_pid(&wstat,child) == -1) die();
+  if (wait_crashed(wstat)) die_childcrashed();
+  if (wait_exitcode(wstat)) die_badauth();
+  die();
+}
+void pop3_greet()
+{
+  char *s;
+  s = unique;
+  s += fmt_uint(s,getpid());
+  *s++ = '.';
+  s += fmt_ulong(s,(unsigned long) now());
+  *s++ = '@';
+  *s++ = 0;
+  puts("+OK <");
+  puts(unique);
+  puts(hostname);
+  puts(">\r\n");
+  flush();
+}
+void pop3_user(arg) char *arg;
+{
+  if (!*arg) { err_syntax(); return; }
+  okay(0);
+  seenuser = 1;
+  if (!stralloc_copys(&username,arg)) die_nomem(); 
+  if (!stralloc_0(&username)) die_nomem(); 
+}
+void pop3_pass(arg) char *arg;
+{
+  if (!seenuser) { err_wantuser(); return; }
+  if (!*arg) { err_syntax(); return; }
+  doanddie(username.s,username.len,arg);
+}
+void pop3_apop(arg) char *arg;
+{
+  char *space;
+  space = arg + str_chr(arg,' ');
+  if (!*space) { err_syntax(); return; }
+  *space++ = 0;
+  doanddie(arg,space - arg,space);
+}
+
+struct commands pop3commands[] = {
+  { "user", pop3_user, 0 }
+, { "pass", pop3_pass, 0 }
+, { "apop", pop3_apop, 0 }
+, { "quit", pop3_quit, 0 }
+, { "noop", okay, 0 }
+, { 0, err_authoriz, 0 }
+} ;
+
+void main(argc,argv)
+int argc;
+char **argv;
+{
+  sig_alarmcatch(die);
+  sig_pipeignore();
+ 
+  hostname = argv[1];
+  if (!hostname) die_usage();
+  childargs = argv + 2;
+  if (!*childargs) die_usage();
+ 
+  pop3_greet();
+  commands(&ssin,pop3commands);
+  die();
+}