BSD 4_1c_2 development

Work on file usr/src/new/courier/daemon/RCS/courierd.c,v
Work on file usr/src/new/courier/daemon/RCS/Makefile,v
Work on file usr/src/new/courier/daemon/Makefile
Work on file usr/src/new/courier/daemon/courierd.c

Synthesized-from: CSRG/cd1/4.1c.2

diff --git a/usr/src/new/courier/daemon/Makefile b/usr/src/new/courier/daemon/Makefile
new file mode 100644 (file)
index 0000000..365f517
--- /dev/null
+++ b/usr/src/new/courier/daemon/Makefile
@@ -0,0 +1,10 @@
+OBJS = courierd.o
+CFLAGS =  -O
+LIBS = -ljobs
+DESTDIR = /etc
+
+courierd:      $(OBJS)
+       $(CC) $(CFLAGS) -o courierd $(OBJS) $(LIBS)
+
+install:       courierd
+       install -s courierd $(DESTDIR)

diff --git a/usr/src/new/courier/daemon/RCS/Makefile,v b/usr/src/new/courier/daemon/RCS/Makefile,v
new file mode 100644 (file)
index 0000000..b194d11
--- /dev/null
+++ b/usr/src/new/courier/daemon/RCS/Makefile,v
@@ -0,0 +1,34 @@
+head     1.1;
+access   ;
+symbols  ;
+locks    ;
+comment  @@;
+
+
+1.1
+date     83.03.01.16.19.00;  author cooper;  state Exp;
+branches ;
+next     ;
+
+
+desc
+@Makefile for Courier daemon.
+@
+
+
+1.1
+log
+@Initial revision
+@
+text
+@OBJS = courierd.o
+CFLAGS =  -O
+LIBS = -ljobs
+DESTDIR = /etc
+
+courierd:      $(OBJS)
+       $(CC) $(CFLAGS) -o courierd $(OBJS) $(LIBS)
+
+install:       courierd
+       install -s courierd $(DESTDIR)
+@

diff --git a/usr/src/new/courier/daemon/RCS/courierd.c,v b/usr/src/new/courier/daemon/RCS/courierd.c,v
new file mode 100644 (file)
index 0000000..cd7dd82
--- /dev/null
+++ b/usr/src/new/courier/daemon/RCS/courierd.c,v
@@ -0,0 +1,149 @@
+head     1.1;
+access   ;
+symbols  ;
+locks    ;
+comment  @ * @;
+
+
+1.1
+date     83.03.01.16.19.08;  author cooper;  state Exp;
+branches ;
+next     ;
+
+
+desc
+@Courier daemon.
+@
+
+
+1.1
+log
+@Initial revision
+@
+text
+@/*
+ * Courier program instantiation server
+ *
+ * Listens on the well-known socket for Courier, as defined in /etc/services.
+ * When a connection is made, it reads the program name as a Courier string.
+ * The directory /usr/lib/courier is used as a database of program names;
+ * the executable program must either reside there or have a link there.
+ * The program is spawned with user and group ID equal to that of the
+ * executable file, and must write a single zero byte back to the caller to 
+ * indicate successful instantiation.
+ * If instantiation was unsuccessful, the daemon will write back a null-
+ * terminated error message.
+ */
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <netinet/in.h>
+#include <signal.h>
+#include <errno.h>
+#include <wait.h>
+#include <netdb.h>
+#include <courier.h>
+
+main(argc, argv)
+       int argc;
+       char **argv;
+{
+       int f, s, pid, len;
+       struct sockaddr_in sin, from;
+       struct servent *srvp;
+       extern int errno;
+
+       if (argc != 1)
+               fprintf(stderr, "Courier daemon: arguments ignored\n");
+       srvp = getservbyname("courier", "tcp");
+       if (srvp == 0) {
+               fprintf(stderr, "tcp/courier: unknown service\n");
+               exit(1);
+       }
+       if (chdir("/usr/lib/courier")) {
+               perror("/usr/lib/courier");
+               exit(1);
+       }
+       sin.sin_port = srvp->s_port;
+       f = socket(AF_INET, SOCK_STREAM, 0, 0);
+       if (f < 0) {
+               perror("Courier daemon: socket");
+               exit(1);
+       }
+       sin.sin_family = AF_INET;
+       if (bind(f, &sin, sizeof(struct sockaddr_in), 0) < 0) {
+               perror("Courier daemon: bind");
+               exit(1);
+       }
+       listen(f, 10);
+       for (;;) {
+               len = sizeof(from);
+               s = accept(f, &from, &len, 0);
+               if (s < 0) {
+                       if (errno != EINTR) {
+                               perror("Courier daemon: accept");
+                               sleep(1);
+                       }
+                       continue;
+               }
+               if ((pid = fork()) == 0) {
+                       close(f);
+                       instantiate(s);
+               }
+               close(s);
+               if (pid == -1)
+                       error("Try again.\n");
+               while(wait3(0, WNOHANG, 0) > 0)
+                       continue;
+       }
+}
+
+instantiate(f)
+       int f;
+{
+       Cardinal n, nbytes;
+       struct stat statbuf;
+       char name[200];
+
+       setpgrp(0, getpid());
+       sigset(SIGHUP, SIG_DFL);
+       sigset(SIGINT, SIG_DFL);
+       sigset(SIGQUIT, SIG_DFL);
+
+       dup2(f, 0);
+       dup2(f, 1);
+       close(f);
+
+       alarm(60);
+       read(0, &n, sizeof(Cardinal));
+       alarm(0);
+
+       UnpackCardinal(&nbytes, &n);
+       /*
+        * Courier strings are always word-aligned, so if the byte count is odd,
+        * we must also read the padding byte.
+        */
+       read(0, name, nbytes + (nbytes % 2));
+       name[nbytes] = '\0';
+
+       if (name[0] == '/' || name[0] == '.' || stat(name, &statbuf) != 0)
+               goto bad;
+       setgroups(0, 0);
+       setregid(statbuf.st_gid, statbuf.st_gid);
+       setreuid(statbuf.st_uid, statbuf.st_uid);
+       execl(name, name, 0);
+bad:
+       error("Unknown Courier program.\n");
+       exit(1);
+}
+
+/*
+ * Write back a null-terminated error message.
+ */
+error(s)
+       char *s;
+{
+       write(1, s, strlen(s)+1);
+}
+@

diff --git a/usr/src/new/courier/daemon/courierd.c b/usr/src/new/courier/daemon/courierd.c
new file mode 100644 (file)
index 0000000..f9f8d98
--- /dev/null
+++ b/usr/src/new/courier/daemon/courierd.c
@@ -0,0 +1,125 @@
+/*
+ * Courier program instantiation server
+ *
+ * Listens on the well-known socket for Courier, as defined in /etc/services.
+ * When a connection is made, it reads the program name as a Courier string.
+ * The directory /usr/lib/courier is used as a database of program names;
+ * the executable program must either reside there or have a link there.
+ * The program is spawned with user and group ID equal to that of the
+ * executable file, and must write a single zero byte back to the caller to 
+ * indicate successful instantiation.
+ * If instantiation was unsuccessful, the daemon will write back a null-
+ * terminated error message.
+ */
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <netinet/in.h>
+#include <signal.h>
+#include <errno.h>
+#include <wait.h>
+#include <netdb.h>
+#include <courier.h>
+
+main(argc, argv)
+       int argc;
+       char **argv;
+{
+       int f, s, pid, len;
+       struct sockaddr_in sin, from;
+       struct servent *srvp;
+       extern int errno;
+
+       if (argc != 1)
+               fprintf(stderr, "Courier daemon: arguments ignored\n");
+       srvp = getservbyname("courier", "tcp");
+       if (srvp == 0) {
+               fprintf(stderr, "tcp/courier: unknown service\n");
+               exit(1);
+       }
+       if (chdir("/usr/lib/courier")) {
+               perror("/usr/lib/courier");
+               exit(1);
+       }
+       sin.sin_port = srvp->s_port;
+       f = socket(AF_INET, SOCK_STREAM, 0, 0);
+       if (f < 0) {
+               perror("Courier daemon: socket");
+               exit(1);
+       }
+       sin.sin_family = AF_INET;
+       if (bind(f, &sin, sizeof(struct sockaddr_in), 0) < 0) {
+               perror("Courier daemon: bind");
+               exit(1);
+       }
+       listen(f, 10);
+       for (;;) {
+               len = sizeof(from);
+               s = accept(f, &from, &len, 0);
+               if (s < 0) {
+                       if (errno != EINTR) {
+                               perror("Courier daemon: accept");
+                               sleep(1);
+                       }
+                       continue;
+               }
+               if ((pid = fork()) == 0) {
+                       close(f);
+                       instantiate(s);
+               }
+               close(s);
+               if (pid == -1)
+                       error("Try again.\n");
+               while(wait3(0, WNOHANG, 0) > 0)
+                       continue;
+       }
+}
+
+instantiate(f)
+       int f;
+{
+       Cardinal n, nbytes;
+       struct stat statbuf;
+       char name[200];
+
+       setpgrp(0, getpid());
+       sigset(SIGHUP, SIG_DFL);
+       sigset(SIGINT, SIG_DFL);
+       sigset(SIGQUIT, SIG_DFL);
+
+       dup2(f, 0);
+       dup2(f, 1);
+       close(f);
+
+       alarm(60);
+       read(0, &n, sizeof(Cardinal));
+       alarm(0);
+
+       UnpackCardinal(&nbytes, &n);
+       /*
+        * Courier strings are always word-aligned, so if the byte count is odd,
+        * we must also read the padding byte.
+        */
+       read(0, name, nbytes + (nbytes % 2));
+       name[nbytes] = '\0';
+
+       if (name[0] == '/' || name[0] == '.' || stat(name, &statbuf) != 0)
+               goto bad;
+       setgroups(0, 0);
+       setregid(statbuf.st_gid, statbuf.st_gid);
+       setreuid(statbuf.st_uid, statbuf.st_uid);
+       execl(name, name, 0);
+bad:
+       error("Unknown Courier program.\n");
+       exit(1);
+}
+
+/*
+ * Write back a null-terminated error message.
+ */
+error(s)
+       char *s;
+{
+       write(1, s, strlen(s)+1);
+}