Move the few BS2000 specific in unixd.c

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@105361 13f79535-47bb-0310-9956-ffa450edef68

3 files changed, 135 insertions, 1 deletions

diff --git a/os/config.m4 b/os/config.m4
index 8dbe925fda..e4757b0891 100644
--- a/os/config.m4
+++ b/os/config.m4
@@ -11,7 +11,7 @@ case $host in
   ;;
 bs2000*)
   OS="unix"
-  OS_DIR=bs2000  # only the OS_DIR is platform specific.
+  OS_DIR=$OS
   ;;
 *cygwin*)
   OS="cygwin"
diff --git a/os/unix/os.h b/os/unix/os.h
index 322ad8f1a6..a78324fba9 100644
--- a/os/unix/os.h
+++ b/os/unix/os.h
@@ -23,4 +23,8 @@
 #define PLATFORM "Unix"
 #endif
 
+#ifdef _OSD_POSIX
+pid_t os_fork(const char *user);
+#endif
+
 #endif	/* !APACHE_OS_H */
diff --git a/os/unix/unixd.c b/os/unix/unixd.c
index 1d4c770bf0..3521718d1c 100644
--- a/os/unix/unixd.c
+++ b/os/unix/unixd.c
@@ -457,11 +457,26 @@ AP_DECLARE(apr_status_t) unixd_accept(void **accepted, ap_listen_rec *lr,
 {
     apr_socket_t *csd;
     apr_status_t status;
+#ifdef _OSD_POSIX
+    int sockdes;
+#endif
 
     *accepted = NULL;
     status = apr_socket_accept(&csd, lr->sd, ptrans);
     if (status == APR_SUCCESS) { 
         *accepted = csd;
+#ifdef _OSD_POSIX
+        apr_os_sock_get(&sockdes, csd);
+        if (sockdes >= FD_SETSIZE) {
+            ap_log_error(APLOG_MARK, APLOG_WARNING, 0, NULL,
+                         "new file descriptor %d is too large; you probably need "
+                         "to rebuild Apache with a larger FD_SETSIZE "
+                         "(currently %d)",
+                         sockdes, FD_SETSIZE);
+            apr_socket_close(csd);
+            return APR_EINTR;
+        }
+#endif
         return APR_SUCCESS;
     }
 
@@ -585,3 +600,118 @@ AP_DECLARE(apr_status_t) unixd_accept(void **accepted, ap_listen_rec *lr,
     return status;
 }
 
+
+#ifdef _OSD_POSIX
+
+#include "apr_lib.h"
+
+#define USER_LEN 8
+
+typedef enum
+{
+    bs2_unknown,     /* not initialized yet. */
+    bs2_noFORK,      /* no fork() because -X flag was specified */
+    bs2_FORK,        /* only fork() because uid != 0 */
+    bs2_UFORK        /* Normally, ufork() is used to switch identities. */
+} bs2_ForkType;
+
+static bs2_ForkType forktype = bs2_unknown;
+
+
+static void ap_str_toupper(char *str)
+{
+    while (*str) {
+	*str = apr_toupper(*str);
+	++str;
+    }
+}
+
+/* Determine the method for forking off a child in such a way as to
+ * set both the POSIX and BS2000 user id's to the unprivileged user.
+ */
+static bs2_ForkType os_forktype(int one_process)
+{
+    /* have we checked the OS version before? If yes return the previous
+     * result - the OS release isn't going to change suddenly!
+     */
+    if (forktype == bs2_unknown) {
+        /* not initialized yet */
+
+        /* No fork if the one_process option was set */
+        if (one_process) {
+            forktype = bs2_noFORK;
+        }
+        /* If the user is unprivileged, use the normal fork() only. */
+        else if (getuid() != 0) {
+            forktype = bs2_FORK;
+        }
+        else
+            forktype = bs2_UFORK;
+    }
+    return forktype;
+}
+
+
+
+/* This routine complements the setuid() call: it causes the BS2000 job
+ * environment to be switched to the target user's user id.
+ * That is important if CGI scripts try to execute native BS2000 commands.
+ */
+int os_init_job_environment(server_rec *server, const char *user_name, int one_process)
+{
+    bs2_ForkType            type = os_forktype(one_process);
+
+    /* We can be sure that no change to uid==0 is possible because of
+     * the checks in http_core.c:set_user()
+     */
+
+    if (one_process) {
+
+	type = forktype = bs2_noFORK;
+
+	ap_log_error(APLOG_MARK, APLOG_ERR, 0, server,
+		     "The debug mode of Apache should only "
+		     "be started by an unprivileged user!");
+	return 0;
+    }
+
+    return 0;
+}
+
+/* BS2000 requires a "special" version of fork() before a setuid() call */
+pid_t os_fork(const char *user)
+{
+    pid_t pid;
+    char  username[USER_LEN+1];
+
+    switch (os_forktype(0)) {
+
+      case bs2_FORK:
+	pid = fork();
+	break;
+
+      case bs2_UFORK:
+	apr_cpystrn(username, user, sizeof username);
+
+	/* Make user name all upper case - for some versions of ufork() */
+	ap_str_toupper(username);
+
+	pid = ufork(username);
+	if (pid == -1 && errno == EPERM) {
+	    ap_log_error(APLOG_MARK, APLOG_EMERG, errno,
+			 NULL, "ufork: Possible mis-configuration "
+			 "for user %s - Aborting.", user);
+	    exit(1);
+	}
+	break;
+
+      default:
+	pid = 0;
+	break;
+    }
+
+    return pid;
+}
+
+#endif /* _OSD_POSIX */
+