X-Git-Url: https://git.distorted.org.uk/~mdw/adns/blobdiff_plain/5928744e4ec4b67fa711572bfc18d6aad7c889ef..83e1be2f4b6bb25036b70b246d3bbc08f4390f3b:/client/adnsresfilter.c?ds=sidebyside

diff --git a/client/adnsresfilter.c b/client/adnsresfilter.c
index d7150e8..d091def 100644
--- a/client/adnsresfilter.c
+++ b/client/adnsresfilter.c
@@ -33,13 +33,73 @@
 #include <assert.h>
 #include <ctype.h>
 
+#include <sys/fcntl.h>
+
 #include "adns.h"
 #include "config.h"
+#include "dlist.h"
+#include "tvarith.h"
+
+struct outqueuenode {
+  struct outqueuenode *next, *back;
+  void *buffer;
+  char *textp;
+  int textlen;
+  struct timeval printbefore;
+  struct treething *addr;
+};
+
+static int bracket, forever, timeout=10;
+static adns_rrtype rrt= adns_r_ptr;
+
+static int outblocked, inputeof;
+static struct { struct outqueuenode *head, *tail; } outqueue;
+static int peroutqueuenode, outqueuelen;
+
+static struct sockaddr_in sa;
+static adns_state ads;
+
+static char addrtextbuf[14];
+static int cbyte, inbyte, inbuf;
+static unsigned char bytes[4];
+static struct timeval printbefore;
+
+struct treething {
+  unsigned char bytes[4];
+  adns_query qu;
+  adns_answer *ans;
+};
+
+static struct treething *newthing;
+static void *treeroot;
+
+static int nonblock(int fd, int isnonblock) {
+  int r;
+
+  r= fcntl(fd,F_GETFL); 
+  if (r==-1) return -1;
+  r= fcntl(fd,F_SETFL, isnonblock ? r|O_NONBLOCK : r&~O_NONBLOCK);
+  if (r==-1) return -1;
+  return 0;
+}
+
+static void quit(int exitstatus) NONRETURNING;
+static void quit(int exitstatus) {
+  nonblock(0,0);
+  nonblock(1,0);
+  exit(exitstatus);
+}
 
 static void sysfail(const char *what) NONRETURNING;
 static void sysfail(const char *what) {
   fprintf(stderr,"adnsresfilter: system call failed: %s: %s\n",what,strerror(errno));
-  exit(2);
+  quit(2);
+}
+
+static void *xmalloc(size_t sz) {
+  void *r;
+  r= malloc(sz);  if (r) return r;
+  sysfail("malloc");
 }
 
 static void outputerr(void) NONRETURNING;
@@ -50,6 +110,7 @@ static void usage(void) {
 	     "       adnsresfilter  -h|--help\n"
 	     "options: -b|--brackets\n"
 	     "         -w|--wait\n"
+	     "         -t<timeout>|--timeout <timeout>\n"
 	     "         -u|--unchecked\n")
       == EOF) outputerr();
 }
@@ -58,101 +119,22 @@ static void usageerr(const char *why) NONRETURNING;
 static void usageerr(const char *why) {
   fprintf(stderr,"adnsresfilter: bad usage: %s\n",why);
   usage();
-  exit(1);
+  quit(1);
 }
 
 static void adnsfail(const char *what, int e) NONRETURNING;
 static void adnsfail(const char *what, int e) {
   fprintf(stderr,"adnsresfilter: adns call failed: %s: %s\n",what,strerror(e));
-  exit(2);
+  quit(2);
 }
 
-static int bracket, forever;
-static adns_rrtype rrt= adns_r_ptr;
-
-static struct sockaddr_in sa;
-static adns_state ads;
-
-static char buf[14];
-static int c, cbyte, inbyte, inbuf;
-static unsigned char bytes[4];
-
-struct treething {
-  unsigned char bytes[4];
-  adns_query qu;
-  adns_answer *ans;
-};
-
-static struct treething *newthing;
-static void *treeroot;
-
 static int comparer(const void *a, const void *b) {
   return memcmp(a,b,4);
 }
 
-static void restartbuf(void) {
-  if (inbuf>0) {
-    buf[inbuf++]= 0;
-    if (fputs(buf,stdout) < 0) outputerr();
-  }
-  inbuf= 0;
-}
-
-static void procaddr(void) {
-  struct treething *foundthing;
-  void *expectreturn, **searchfound;
-  int r;
-  
-  if (!newthing) {
-    newthing= malloc(sizeof(struct treething));
-    if (!newthing) sysfail("malloc");
-    newthing->qu= 0;
-    newthing->ans= 0;
-  }
-
-  memcpy(newthing->bytes,bytes,4);
-  searchfound= tsearch(newthing,&treeroot,comparer);
-  if (!searchfound) sysfail("tsearch");
-  foundthing= *searchfound;
-
-  if (foundthing == newthing) {
-    newthing= 0;
-    memcpy(&sa.sin_addr,bytes,4);
-    r= adns_submit_reverse(ads, (const struct sockaddr*)&sa,
-			   rrt,0,foundthing,&foundthing->qu);
-    if (r) adnsfail("submit",r);
-  }
-  if (!forever && foundthing->ans && foundthing->ans->status == adns_s_timeout) {
-    free(foundthing->ans);
-    foundthing->ans= 0;
-  }
-  if (!foundthing->ans) {
-    expectreturn= foundthing;
-    r= (forever ? adns_wait : adns_check)
-      (ads,&foundthing->qu,&foundthing->ans,&expectreturn);
-    assert(r==EAGAIN || (!r && foundthing->ans && expectreturn==foundthing));
-  }
-  if (foundthing->ans && foundthing->ans->nrrs > 0) {
-    if (fputs(foundthing->ans->rrs.str[0],stdout) < 0) outputerr();
-    inbuf= 0;
-  } else {
-    restartbuf();
-  }
-  cbyte= -1;
-}
-
-static void startaddr(void) {
-  bytes[cbyte=0]= 0;
-  inbyte= 0;
-}
-
-static void mustputchar(int c) {
-  if (putchar(c) == EOF) outputerr();
-}
-
-int main(int argc, const char *const *argv) {
+static void parseargs(const char *const *argv) {
   const char *arg;
-  int nbyte, r;
+  int c;
 
   while ((arg= *++argv)) {
     if (arg[0] != '-') usageerr("no non-option arguments are allowed");
@@ -164,7 +146,7 @@ int main(int argc, const char *const *argv) {
       } else if (!strcmp(arg,"--wait")) {
 	forever= 1;
       } else if (!strcmp(arg,"--help")) {
-	usage(); exit(0);
+	usage(); quit(0);
       } else {
 	usageerr("unknown long option");
       }
@@ -181,56 +163,250 @@ int main(int argc, const char *const *argv) {
 	  forever= 1;
 	  break;
 	case 'h':
-	  usage(); exit(0);
+	  usage(); quit(0);
 	default:
 	  usageerr("unknown short option");
 	}
       }
     }
   }
-  if (setvbuf(stdout,0,_IOLBF,0)) sysfail("setvbuf stdout");
+}
 
-  memset(&sa,0,sizeof(sa));
-  sa.sin_family= AF_INET;
+static void queueoutchar(int c) {
+  struct outqueuenode *entry;
+  
+  entry= outqueue.tail;
+  if (!entry->back || entry->addr || entry->textlen >= peroutqueuenode) {
+    entry= xmalloc(sizeof(*entry));
+    peroutqueuenode= !entry->back || entry->addr ? 32 : 
+      peroutqueuenode >= 1024 ? 2048 : peroutqueuenode<<1;
+    entry->buffer= xmalloc(peroutqueuenode);
+    entry->textp= entry->buffer;
+    entry->textlen= 0;
+    entry->addr= 0;
+    LIST_LINK_TAIL(outqueue,entry);
+    outqueuelen++;
+  }
+  *entry->textp++= c;
+  entry->textlen++;
+}
 
-  r= adns_init(&ads,0,0);  if (r) adnsfail("init",r);
+static void queueoutstr(const char *str, int len) {
+  while (len > 0) queueoutchar(*str++);
+}
 
-  cbyte= -1;
-  inbyte= -1;
+static void writestdout(struct outqueuenode *entry) {
+  int r;
+
+  while (entry->textlen) {
+    r= write(1, entry->textp, entry->textlen);
+    if (r < 0) {
+      if (errno == EINTR) continue;
+      if (errno == EAGAIN) { outblocked= 1; break; }
+      sysfail("write stdout");
+    }
+    assert(r < entry->textlen);
+    entry->textp += r;
+    entry->textlen -= r;
+  }
+  if (!entry->textlen) {
+    LIST_UNLINK(outqueue,entry);
+    free(entry->buffer);
+    free(entry);
+    outqueuelen--;
+  }
+}
+
+static void replacetextwithname(struct outqueuenode *entry) {
+  free(entry->buffer);
+  entry->buffer= 0;
+  entry->textp= entry->addr->ans->rrs.str[0];
+  entry->textlen= strlen(entry->textp);
+}
+
+static void checkadnsqueries(void) {
+  adns_query qu;
+  adns_answer *ans;
+  void *context;
+  struct treething *foundthing;
+  int r;
+
+  for (;;) {
+    qu= 0; context= 0; ans= 0;
+    r= adns_check(ads,&qu,&ans,&context);
+    if (r == ESRCH || r == EAGAIN) break;
+    assert(!r);
+    foundthing= context;
+    foundthing->ans= ans;
+    foundthing->qu= 0;
+  }
+}
+
+static void restartbuf(void) {
+  if (inbuf>0) queueoutstr(addrtextbuf,inbuf);
   inbuf= 0;
-  if (!bracket) startaddr();
-  while ((c= getchar()) != EOF) {
+}
+
+static void procaddr(void) {
+  struct treething *foundthing;
+  void **searchfound;
+  struct outqueuenode *entry;
+  int r;
+  
+  if (!newthing) {
+    newthing= xmalloc(sizeof(struct treething));
+    newthing->qu= 0;
+    newthing->ans= 0;
+  }
+
+  memcpy(newthing->bytes,bytes,4);
+  searchfound= tsearch(newthing,&treeroot,comparer);
+  if (!searchfound) sysfail("tsearch");
+  foundthing= *searchfound;
+
+  if (foundthing == newthing) {
+    memcpy(&sa.sin_addr,bytes,4);
+    r= adns_submit_reverse(ads, (const struct sockaddr*)&sa,
+			   rrt,0,foundthing,&foundthing->qu);
+    if (r) adnsfail("submit",r);
+  }
+  entry= xmalloc(sizeof(*entry));
+  entry->buffer= xmalloc(inbuf);
+  entry->textp= entry->buffer;
+  memcpy(entry->textp,addrtextbuf,inbuf);
+  entry->textlen= inbuf;
+  entry->addr= foundthing;
+  LIST_LINK_TAIL(outqueue,entry);
+  outqueuelen++;
+  inbuf= 0;
+  cbyte= -1;
+}
+
+static void startaddr(void) {
+  bytes[cbyte=0]= 0;
+  inbyte= 0;
+}
+
+static void readstdin(void) {
+  char readbuf[512], *p;
+  int r, c, nbyte;
+
+  while ((r= read(0,readbuf,sizeof(readbuf))) <= 0) {
+    if (r == 0) { inputeof= 1; return; }
+    if (r == EAGAIN) return;
+    if (r != EINTR) sysfail("read stdin");
+  }
+  for (p=readbuf; r>0; r--,p++) {
+    c= *p++;
     if (cbyte==-1 && bracket && c=='[') {
-      buf[inbuf++]= c;
+      addrtextbuf[inbuf++]= c;
       startaddr();
     } else if (cbyte==-1 && !bracket && !isalnum(c)) {
-      mustputchar(c);
+      queueoutchar(c);
       startaddr();
     } else if (cbyte>=0 && inbyte<3 && c>='0' && c<='9' &&
 	       (nbyte= bytes[cbyte]*10 + (c-'0')) <= 255) {
       bytes[cbyte]= nbyte;
-      buf[inbuf++]= c;
+      addrtextbuf[inbuf++]= c;
       inbyte++;
     } else if (cbyte>=0 && cbyte<3 && inbyte>0 && c=='.') {
       bytes[++cbyte]= 0;
-      buf[inbuf++]= c;
+      addrtextbuf[inbuf++]= c;
       inbyte= 0;
     } else if (cbyte==3 && inbyte>0 && bracket && c==']') {
-      buf[inbuf++]= c;
+      addrtextbuf[inbuf++]= c;
       procaddr();
     } else if (cbyte==3 && inbyte>0 && !bracket && !isalnum(c)) {
       procaddr();
-      mustputchar(c);
+      queueoutchar(c);
       startaddr();
     } else {
       restartbuf();
-      mustputchar(c);
+      queueoutchar(c);
       cbyte= -1;
       if (!bracket && !isalnum(c)) startaddr();
     }
   }
-  if (ferror(stdin) || fclose(stdin)) sysfail("read stdin");
   if (cbyte==3 && inbyte>0 && !bracket) procaddr();
+}
+
+static void startup(void) {
+  int r;
+
+  if (setvbuf(stdout,0,_IOLBF,0)) sysfail("setvbuf stdout");
+  if (nonblock(0,1)) sysfail("set stdin to nonblocking mode");
+  if (nonblock(1,1)) sysfail("set stdout to nonblocking mode");
+  memset(&sa,0,sizeof(sa));
+  sa.sin_family= AF_INET;
+  r= adns_init(&ads,0,0);  if (r) adnsfail("init",r);
+  cbyte= -1;
+  inbyte= -1;
+  inbuf= 0;
+  if (!bracket) startaddr();
+}
+
+int main(int argc, const char *const *argv) {
+  int r, maxfd;
+  fd_set readfds, writefds, exceptfds;
+  struct outqueuenode *entry;
+  struct timeval *tv, tvbuf, now;
+
+  parseargs(argv);
+  startup();
+
+  while (!inputeof || outqueue.head) {
+    maxfd= 2;
+    tv= 0;
+    FD_ZERO(&readfds); FD_ZERO(&writefds); FD_ZERO(&exceptfds);
+    if ((entry= outqueue.head) && !outblocked) {
+      if (!entry->addr) {
+	writestdout(entry);
+	continue;
+      } else if (entry->addr->ans) {
+	if (entry->addr->ans->nrrs) 
+	  replacetextwithname(entry);
+	entry->addr= 0;
+	continue;
+      }
+      r= gettimeofday(&now,0);  if (r) sysfail("gettimeofday");
+      if (forever) {
+	tv= 0;
+      } else if (!timercmp(&now,&entry->printbefore,<)) {
+	entry->addr= 0;
+	continue;
+      } else {
+	tvbuf.tv_sec= printbefore.tv_sec - now.tv_sec - 1;
+	tvbuf.tv_usec= printbefore.tv_usec - now.tv_usec + 1000000;
+	tvbuf.tv_sec += tvbuf.tv_usec / 1000000;
+	tvbuf.tv_usec %= 1000000;
+	tv= &tvbuf;
+      }
+      adns_beforeselect(ads,&maxfd,&readfds,&writefds,&exceptfds,
+			&tv,&tvbuf,&now);
+    }
+    if (outblocked) FD_SET(1,&writefds);
+    if (!inputeof && outqueuelen<1000) FD_SET(0,&readfds);
+    
+    r= select(maxfd,&readfds,&writefds,&exceptfds,tv);
+    if (r < 0) { if (r == EINTR) continue; else sysfail("select"); }
+
+    r= gettimeofday(&now,0);  if (r) sysfail("gettimeofday");
+    adns_afterselect(ads,maxfd,&readfds,&writefds,&exceptfds,&now);
+    checkadnsqueries();
+
+    if (FD_ISSET(0,&readfds)) {
+      if (!forever) {
+	printbefore= now;
+	timevaladd(&printbefore,timeout);
+      }
+      readstdin();
+    } else if (FD_ISSET(1,&writefds)) {
+      outblocked= 0;
+    }
+  }
+  if (ferror(stdin) || fclose(stdin)) sysfail("read stdin");
   if (fclose(stdout)) sysfail("close stdout");
+  if (nonblock(0,0)) sysfail("un-nonblock stdin");
+  if (nonblock(1,0)) sysfail("un-nonblock stdout");
   exit(0);
 }