1 files changed, 276 insertions, 0 deletions
diff --git a/src/spawn.c b/src/spawn.c
new file mode 100644
index 0000000..effcb26
--- /dev/null
+++ b/src/spawn.c
@@ -0,0 +1,276 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include "alloc.h"
+#include "sig.h"
+#include "wait.h"
+#include "buffer.h"
+#include "byte.h"
+#include "str.h"
+#include "stralloc.h"
+#include "select.h"
+#include "exit.h"
+#include "fd.h"
+#include "open.h"
+#include "error.h"
+#include "auto_qmail.h"
+#include "auto_uids.h"
+#include "auto_spawn.h"
+
+extern int truncreport;
+extern int spawn();
+extern void report();
+extern void initialize();
+
+struct delivery
+ {
+  int used;
+  int fdin; /* pipe input */
+  int pid; /* zero if child is dead */
+  int wstat; /* if !pid: status of child */
+  int fdout; /* pipe output, -1 if !pid; delays eof until after death */
+  stralloc output;
+ }
+;
+
+struct delivery *d;
+
+void sigchld()
+{
+  int wstat;
+  int pid;
+  int i;
+
+  while ((pid = wait_nohang(&wstat)) > 0)
+    for (i = 0; i < auto_spawn; ++i) 
+      if (d[i].used)
+        if (d[i].pid == pid) {
+          close(d[i].fdout); d[i].fdout = -1;
+          d[i].wstat = wstat; d[i].pid = 0;
+        }
+} 
+
+int flagwriting = 1;
+
+ssize_t okwrite(int fd,char *buf,int n)
+{
+  int w;
+  if (!flagwriting) return n;
+  w = write(fd,buf,n);
+  if (w != -1) return w;
+  if (errno == EINTR) return -1;
+  flagwriting = 0; close(fd);
+  return n;
+}
+
+int flagreading = 1;
+char outbuf[1024]; 
+buffer bo;
+
+int stage = 0; /* reading 0:delnum 1:messid 2:sender 3:recip */
+int flagabort = 0; /* if 1, everything except delnum is garbage */
+int delnum;
+stralloc messid = {0};
+stralloc sender = {0};
+stralloc recip = {0};
+
+void err(char *s)
+{
+  char ch; 
+ 
+  ch = delnum; 
+  buffer_put(&bo,&ch,1);
+  buffer_puts(&bo,s); 
+  buffer_putflush(&bo,"",1);
+}
+
+void docmd()
+{
+  int f;
+  int i;
+  int j;
+  int fdmess;
+  int pi[2];
+  struct stat st;
+
+  if (flagabort) { err("Zqmail-spawn: Out of memory. (#4.3.0)\n"); return; }
+  if (delnum < 0) { err("Zqmail-spawn: Internal error: delnum negative. (#4.3.5)\n"); return; }
+  if (delnum >= auto_spawn) { err("Zqmail-spawn: Internal error: delnum too big. (#4.3.5)\n"); return; }
+  if (d[delnum].used) { err("Zqmail-spawn: Internal error: delnum in use. (#4.3.5)\n"); return; }
+ 
+  for (i = 0; i < messid.len; ++i)
+    if (messid.s[i])
+      if (!i || (messid.s[i] != '/'))
+        if ((unsigned char) (messid.s[i] - '0') > 9)
+          { err("Dqmail-spawn: Internal error: messid has nonnumerics. (#5.3.5)\n"); return; }
+
+  if (messid.len > 100) { err("Dqmail-spawn: Internal error: messid too long. (#5.3.5)\n"); return; }
+  if (!messid.s[0]) { err("Dqmail-spawn: Internal error: messid too short. (#5.3.5)\n"); return; }
+
+  if (!stralloc_copys(&d[delnum].output,""))
+   { err("Zqmail-spawn: Out of memory. (#4.3.0)\n"); return; }
+
+  j = byte_rchr(recip.s,recip.len,'@');
+  if (j >= recip.len) { err("DSorry, address must include host name. (#5.1.3)\n"); return; }
+
+  fdmess = open_read(messid.s);
+  if (fdmess == -1) { err("Zqmail-spawn: Unable to open message. (#4.3.0)\n"); return; }
+
+  if (fstat(fdmess,&st) == -1)
+    { close(fdmess); err("Zqmail-spawn: Unable to fstat message. (#4.3.0)\n"); return; }
+  if ((st.st_mode & S_IFMT) != S_IFREG)
+    { close(fdmess); err("ZSorry, message has wrong type. (#4.3.5)\n"); return; }
+  if (st.st_uid != auto_uidq) /* aaack! qmailq has to be trusted! */
+   /* your security is already toast at this point. damage control... */
+    { close(fdmess); err("ZSorry, message has wrong owner. (#4.3.5)\n"); return; }
+
+  if (pipe(pi) == -1) {
+    if (errno == EFAULT) err("Zqmail-spawn: Unable to create pipe (wrong fildes). (#4.3.0)\n"); 
+    else if (errno == EMFILE) err("Zqmail-spawn: Unable to create pipe (too many FDS). (#4.3.0)\n"); 
+    else if (errno == ENFILE) err("Zqmail-spawn: Unable to create pipe (system file table full). (#4.3.0)\n"); 
+    else if (errno == ENOMEM) err("Zqmail-spawn: Unable to create pipe (out of memory). (#4.3.0)\n"); 
+    else err("Zqmail-spawn: Unable to create pipe (unkown reason). (#4.3.0)\n"); 
+    close(fdmess); 
+    return; 
+  }
+
+  fd_coe(pi[0]);
+
+  f = spawn(fdmess,pi[1],sender.s,recip.s,j);
+  close(fdmess);
+
+  if (f == -1)
+    { close(pi[0]); close(pi[1]); err("Zqmail-spawn: Unable to fork. (#4.3.0)\n"); return; }
+
+  d[delnum].fdin = pi[0];
+  d[delnum].fdout = pi[1]; fd_coe(pi[1]);
+  d[delnum].pid = f;
+  d[delnum].used = 1;
+}
+
+char cmdbuf[1024];
+
+void getcmd()
+{
+  int i;
+  int r;
+  char ch;
+
+  r = read(0,cmdbuf,sizeof(cmdbuf));
+  if (r == 0)
+    { flagreading = 0; return; }
+  if (r == -1) {
+    if (errno != EINTR)
+      flagreading = 0;
+    return;
+  }
+ 
+  for (i = 0; i < r; ++i) {
+    ch = cmdbuf[i];
+    switch (stage) {
+      case 0:
+        delnum = (unsigned int) (unsigned char) ch;
+        messid.len = 0; stage = 1; break;
+      case 1:
+        if (!stralloc_append(&messid,&ch)) flagabort = 1;
+        if (ch) break;
+        sender.len = 0; stage = 2; break;
+      case 2:
+        if (!stralloc_append(&sender,&ch)) flagabort = 1;
+        if (ch) break;
+        recip.len = 0; stage = 3; break;
+      case 3:
+        if (!stralloc_append(&recip,&ch)) flagabort = 1;
+        if (ch) break;
+        docmd();
+        flagabort = 0; stage = 0; break;
+    }
+  }
+}
+
+char inbuf[128];
+
+int main(int argc,char **argv)
+{
+  char ch;
+  int i;
+  int r;
+  fd_set rfds;
+  int nfds;
+
+  if (chdir(auto_qmail) == -1) _exit(110);
+  if (chdir("queue/mess") == -1) _exit(110);
+  if (!stralloc_copys(&messid,"")) _exit(111);
+  if (!stralloc_copys(&sender,"")) _exit(111);
+  if (!stralloc_copys(&recip,"")) _exit(111);
+
+  d = (struct delivery *) alloc((auto_spawn + 10) * sizeof(struct delivery));
+  if (!d) _exit(111);
+
+  buffer_init(&bo,okwrite,1,outbuf,sizeof(outbuf));
+
+  sig_pipeignore();
+  sig_childcatch(sigchld);
+
+  initialize(argc,argv);
+
+  ch = auto_spawn; 
+  buffer_putflush(&bo,&ch,1);
+
+  for (i = 0; i < auto_spawn; ++i) 
+    { d[i].used = 0; d[i].output.s = 0; }
+
+  for (;;) {
+    if (!flagreading) {
+      for (i = 0; i < auto_spawn; ++i) if (d[i].used) break;
+      if (i >= auto_spawn) _exit(0);
+    }
+    sig_childunblock();
+
+    FD_ZERO(&rfds);
+    if (flagreading) FD_SET(0,&rfds);
+    nfds = 1;
+
+    for (i = 0; i < auto_spawn; ++i) 
+      if (d[i].used) { 
+        FD_SET(d[i].fdin,&rfds); 
+        if (d[i].fdin >= nfds) 
+          nfds = d[i].fdin + 1; 
+      }
+
+    r = select(nfds,&rfds,(fd_set *) 0,(fd_set *) 0,(struct timeval *) 0);
+    sig_childblock();
+
+    if (r != -1) {
+      if (flagreading)
+        if (FD_ISSET(0,&rfds)) getcmd();
+      for (i = 0; i < auto_spawn; ++i) 
+        if (d[i].used)
+
+      if (FD_ISSET(d[i].fdin,&rfds)) {
+        r = read(d[i].fdin,inbuf,128);
+        if (r == -1)
+           continue; /* read error on a readable pipe? be serious */
+        if (r == 0) {
+          ch = i; 
+          buffer_put(&bo,&ch,1);
+          report(&bo,d[i].wstat,d[i].output.s,d[i].output.len);
+          buffer_put(&bo,"",1);
+          buffer_flush(&bo);
+          close(d[i].fdin); d[i].used = 0;
+          continue;
+        }
+        while (!stralloc_readyplus(&d[i].output,r)) 
+          sleep(10); /*XXX*/
+        byte_copy(d[i].output.s + d[i].output.len,r,inbuf);
+        d[i].output.len += r;
+        if (truncreport > 100)
+          if (d[i].output.len > truncreport) {
+            char *truncmess = "\nError report too long, sorry.\n";
+            d[i].output.len = truncreport - str_len(truncmess) - 3;
+            stralloc_cats(&d[i].output,truncmess);
+          }
+      }
+    }
+  }
+}