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-rw-r--r--pgm4/inet_dgrams.d/Makefile17
-rw-r--r--pgm4/inet_dgrams.d/README11
-rw-r--r--pgm4/inet_dgrams.d/fancy_recv_udp.c117
-rw-r--r--pgm4/inet_dgrams.d/recv_udp.c115
-rw-r--r--pgm4/inet_dgrams.d/send_udp.c87
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);
+}
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