Init.HEADmaster

5 files changed, 347 insertions, 0 deletions

diff --git a/pgm4/inet_dgrams.d/Makefile b/pgm4/inet_dgrams.d/Makefile
new file mode 100644
index 0000000..14018f2
--- /dev/null
+++ b/pgm4/inet_dgrams.d/Makefile
@@ -0,0 +1,17 @@
+CC=gcc
+CFLAGS=-g -Wall
+
+all: recv_udp send_udp fancy_recv_udp
+
+recv_udp: recv_udp.o
+	$(CC) -o recv_udp recv_udp.o
+
+fancy_recv_udp: fancy_recv_udp.o
+	$(CC) -o fancy_recv_udp fancy_recv_udp.o
+
+send_udp: send_udp.o
+	$(CC) -o send_udp send_udp.o
+
+clean:
+	rm -f *.o recv_udp send_udp fancy_recv_udp
+
diff --git a/pgm4/inet_dgrams.d/README b/pgm4/inet_dgrams.d/README
new file mode 100644
index 0000000..d5bac0f
--- /dev/null
+++ b/pgm4/inet_dgrams.d/README
@@ -0,0 +1,11 @@
+Some simple programs which do datagram-based message passing on the
+Internet.
+
+-----------
+
+send_udp.c and recv_udp.c are the simple send/receive processes.
+
+send_udp.c and fancy_recv_udp.c implement the "fancy" receiver that
+    was described in lecture.
+
+
diff --git a/pgm4/inet_dgrams.d/fancy_recv_udp.c b/pgm4/inet_dgrams.d/fancy_recv_udp.c
new file mode 100644
index 0000000..bb4c20a
--- /dev/null
+++ b/pgm4/inet_dgrams.d/fancy_recv_udp.c
@@ -0,0 +1,117 @@
+/*********************************************************************\
+* 		       FANCY_RECV_UDP.C				      *
+* Test of UDP/IP. Receive datagrams on internet socket bound to port  *
+* 0x3333 on the local host.					      *
+* 								      *
+* To use:							      *
+* 	1) On the appropriate host, invoke this code by		      *
+* 	   "fancy_recv_udp&".					      *
+* 	2) Invoke send_udp as many times as desired on the	      *
+* 	   remote host.						      *
+* 								      *
+* Phil Kearns							      *
+* April 11, 1987						      *
+* 								      *
+* Modified: April 10, 1992                                            *
+*      responds to input (CR) on stdin by cleanly shutting down       *
+*      also shuts down if no datagrams for a minute                   *
+\*********************************************************************/
+
+#include	<signal.h>
+#include	<errno.h>
+#include	<string.h>
+#include	<stdio.h>
+#include	<sys/socket.h>
+#include	<netinet/in.h>
+#include	<netdb.h>
+#include        <arpa/inet.h>
+#include        <stdlib.h>
+
+void printsin(struct sockaddr_in*, char*, char*);
+
+int main()
+{
+  int	socket_fd, cc, hits, ecode;
+  socklen_t fsize;
+  fd_set mask;
+  struct timeval timeout;
+  struct sockaddr_in	*s_in, from;
+  struct addrinfo hints, *addrlist;
+    
+  struct {
+    char    head;
+    u_long  body;
+    char    tail;
+  } msg;
+
+  memset(&hints, 0, sizeof(hints));
+  hints.ai_family = AF_INET; hints.ai_socktype = SOCK_DGRAM;
+  hints.ai_flags = AI_NUMERICSERV | AI_PASSIVE; hints.ai_protocol = 0;
+  hints.ai_canonname = NULL; hints.ai_addr = NULL;
+  hints.ai_next = NULL;
+
+  ecode = getaddrinfo(NULL, "13107", &hints, &addrlist);
+  if (ecode != 0) {
+    fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ecode));
+    exit(1);
+  }
+
+  s_in = (struct sockaddr_in *) addrlist->ai_addr;
+
+  printsin(s_in, "FANCY_RECV_UDP", "Local socket is:"); fflush(stdout);
+
+
+  socket_fd = socket (addrlist->ai_family, addrlist->ai_socktype, 0);
+  if (socket_fd < 0) {
+    perror ("fancy_recv_udp:socket");
+    exit (1);
+  }
+
+/*
+   bind port 0x3333 on the current host to the socket accessed through
+   socket_fd. If port in use, die.
+*/
+  if (bind(socket_fd, (struct sockaddr *)s_in, sizeof(struct sockaddr_in)) < 0) {
+    perror("fancy_recv_udp:bind");
+    exit(1);
+  }
+
+  for(;;) {
+    fsize = sizeof(from);
+/* Here's the new stuff. Hang a select on the file descriptors 0 (stdin)
+   and socket_fd looking to see if either descriptor is able to be read.
+   If it's stdin, shut down. If it's socket_fd, proceed as normal. If
+   Nothing happens for a minute, shut down also.
+*/
+    FD_ZERO(&mask);
+    FD_SET(0,&mask);
+    FD_SET(socket_fd,&mask);
+    timeout.tv_sec = 60;
+    timeout.tv_usec = 0;
+    if ((hits = select(socket_fd+1, &mask, (fd_set *)0, (fd_set *)0,
+                           &timeout)) < 0) {
+      perror("fancy_recv_udp:select");
+      exit(1);
+    }
+    if ( (hits==0) || ((hits>0) && (FD_ISSET(0,&mask))) ) {
+      printf("Shutting down\n");
+      exit(0);
+    }
+    cc = recvfrom(socket_fd,&msg,sizeof(msg),0,(struct sockaddr *)&from,&fsize);
+    if (cc < 0) perror("recv_udp:recvfrom");
+    printsin( &from, "recv_udp: ", "Packet from:");
+    printf("Got data ::%c%u%c\n",msg.head,ntohl(msg.body),msg.tail);
+    fflush(stdout);
+  }
+  exit(0);
+}
+
+void printsin(struct sockaddr_in *sin, char *m1, char *m2 )
+{
+  char fromip[INET_ADDRSTRLEN];
+
+  printf ("%s %s:\n", m1, m2);
+  printf ("  family %d, addr %s, port %d\n", sin -> sin_family,
+	    inet_ntop(AF_INET, &(sin->sin_addr.s_addr), fromip, sizeof(fromip)),
+            ntohs((unsigned short)(sin -> sin_port)));
+}
diff --git a/pgm4/inet_dgrams.d/recv_udp.c b/pgm4/inet_dgrams.d/recv_udp.c
new file mode 100644
index 0000000..24c47b5
--- /dev/null
+++ b/pgm4/inet_dgrams.d/recv_udp.c
@@ -0,0 +1,115 @@
+/*********************************************************************\
+* 			  RECV_UDP.C				      *
+* Test of UDP/IP. Receive datagrams on internet socket bound to port  *
+* 0x3333 on the local host.					      *
+* 								      *
+* To use:							      *
+* 	1) On the appropriate host, invoke this code by		      *
+* 	   "recv_udp&".						      *
+* 	2) Invoke send_udp as many times as desired on the	      *
+* 	   remote host.						      *
+* 	3) When done, MAKE SURE TO KILL THIS BACKGROUND PROCESS!      *
+* 								      *
+* Phil Kearns							      *
+* April 11, 1987		 				      *
+* 								      *
+* Modified February 2009: use getaddrinfo()                           *
+\*********************************************************************/
+
+#include        <stdlib.h>
+#include	<signal.h>
+#include	<errno.h>
+#include	<string.h>
+#include	<stdio.h>
+#include	<sys/types.h>
+#include	<sys/socket.h>
+#include	<netinet/in.h>
+#include	<netdb.h>
+#include        <arpa/inet.h>
+
+void printsin(struct sockaddr_in*, char*, char*);
+
+int main()
+{
+    int	socket_fd, cc, ecode;
+    socklen_t fsize;
+    struct sockaddr_in	*s_in, from;
+    struct addrinfo hints, *addrlist;
+    void printsin();
+
+    struct {
+	char	head;
+	u_long	body;
+	char	tail;
+    } msg;
+
+/*
+   In order to attach a name to the socket created above, first fill
+   in the appropriate blanks in an inet socket address data structure
+   called "s_in". We blindly pick port number 0x3333. The second step
+   is to BIND the address to the socket. If port 0x3333 is in use, the
+   bind system call will fail detectably.
+*/
+
+  memset(&hints, 0, sizeof(hints));
+  hints.ai_family = AF_INET; hints.ai_socktype = SOCK_DGRAM;
+  hints.ai_flags = AI_NUMERICSERV | AI_PASSIVE; hints.ai_protocol = 0;
+  hints.ai_canonname = NULL; hints.ai_addr = NULL;
+  hints.ai_next = NULL;
+
+/*
+ getaddrinfo() should return a single result, denoting
+ a SOCK_DGRAM socket on any interface of this system at
+ port 0x3333.
+*/
+
+  ecode = getaddrinfo(NULL, "13107", &hints, &addrlist);
+  if (ecode != 0) {
+    fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ecode));
+    exit(1);
+  }
+
+  s_in = (struct sockaddr_in *) addrlist->ai_addr;
+
+  printsin(s_in, "RECV_UDP", "Local socket is:"); fflush(stdout);
+
+/*
+   Create the socket to be used for datagram reception. Initially,
+   it has no name in the internet (or any other) domain.
+*/
+  socket_fd = socket (addrlist->ai_family, addrlist->ai_socktype, 0);
+  if (socket_fd < 0) {
+    perror ("recv_udp:socket");
+    exit (1);
+  }
+
+/*
+   bind port 0x3333 on the current host to the socket accessed through
+   socket_fd. If port in use, bind() will fail and we die.
+*/
+
+  if (bind(socket_fd, (struct sockaddr *)s_in, sizeof(struct sockaddr_in)) < 0) {
+    perror("recv_udp:bind");
+    exit(1);
+  }
+
+  for(;;) {
+    fsize = sizeof(from);
+    cc = recvfrom(socket_fd, &msg, sizeof(msg), 0, (struct sockaddr *)&from, &fsize);
+    if (cc < 0) perror("recv_udp:recvfrom");
+    printsin( &from, "recv_udp: ", "Packet from:");
+    printf("Got data ::%c%u%c\n",msg.head,ntohl(msg.body),msg.tail);
+    fflush(stdout);
+  }
+  exit(0);
+}
+
+void printsin(struct sockaddr_in *sin, char *m1, char *m2 )
+{
+  char fromip[INET_ADDRSTRLEN];
+
+  printf ("%s %s:\n", m1, m2);
+  printf ("  family %d, addr %s, port %d\n", sin -> sin_family,
+	    inet_ntop(AF_INET, &(sin->sin_addr.s_addr), fromip, sizeof(fromip)),
+            ntohs((unsigned short)(sin -> sin_port)));
+}
diff --git a/pgm4/inet_dgrams.d/send_udp.c b/pgm4/inet_dgrams.d/send_udp.c
new file mode 100644
index 0000000..63a3c96
--- /dev/null
+++ b/pgm4/inet_dgrams.d/send_udp.c
@@ -0,0 +1,87 @@
+/***********************************************************************\
+* 			   SEND_UDP.C				        *
+* Test of UDP/IP. Send a single dippy datagram to a receiver process    *
+* assumed to exist on port 0x3333 on the internet host specified as     *
+* the single argument to this program.				        *
+* 								        *
+* To use:							        *
+* 	1) Make sure that recv_udp is running (probably in the	        *
+* 	   background on the target host.			        *
+* 	2) Issue the command "send_udp xx", where xx is a host name.    *
+* 								        *
+* Phil Kearns							        *
+* April 11, 1987					 	        *
+* 								        *
+* Modified February 2009: use getaddrinfo()                             *
+\***********************************************************************/
+
+#include        <stdlib.h>
+#include        <unistd.h>
+#include	<signal.h>
+#include	<errno.h>
+#include	<string.h>
+#include	<stdio.h>
+#include	<sys/types.h>
+#include	<sys/socket.h>
+#include	<netinet/in.h>
+#include	<netdb.h>
+
+int main(int argc,char **argv)
+{
+  int	socket_fd, cc, ecode;
+  struct sockaddr_in *dest;
+  struct addrinfo hints, *addrlist;
+  struct {
+    char   head;
+    u_long body;
+    char   tail;
+  } msgbuf;
+
+
+/*
+   Use getaddrinfo to create a SOCK_DGRAM sockarddr_in set
+   up for the host specified as argv[1] and port 0x3333.
+*/
+
+  memset(&hints, 0, sizeof(hints));
+  hints.ai_family = AF_INET; hints.ai_socktype = SOCK_DGRAM;
+  hints.ai_flags = AI_NUMERICSERV; hints.ai_protocol = 0;
+  hints.ai_canonname = NULL; hints.ai_addr = NULL;
+  hints.ai_next = NULL;
+
+  ecode = getaddrinfo(argv[1], "13107", &hints, &addrlist);
+  if (ecode != 0) {
+    fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(ecode));
+    exit(1);
+  }
+
+  dest = (struct sockaddr_in *) addrlist->ai_addr; // Will use in sendto().
+
+/*
+   Set up a datagram (UDP/IP) socket in the Internet domain.
+   We will use it as the handle thru which we will send a
+   single datagram. Note that, since this no message is ever
+   addressed TO this socket, we do not bind an internet address
+   to it. It will be assigned a (temporary) address when we send
+   a message thru it.
+*/
+
+  socket_fd = socket (addrlist->ai_family, addrlist->ai_socktype, 0);
+  if (socket_fd == -1) {
+    perror ("send_udp:socket");
+    exit (1);
+  }
+
+  msgbuf.head = '<';
+  msgbuf.body = htonl(getpid());
+  msgbuf.tail = '>';
+
+  cc = sendto(socket_fd,&msgbuf,sizeof(msgbuf),0,(struct sockaddr *) dest,
+                  sizeof(struct sockaddr_in));
+  if (cc < 0) {
+    perror("send_udp:sendto");
+    exit(1);
+  }
+
+  exit(0);
+}