From: Philip Homburg <philip@cs.vu.nl>
Date: Fri, 27 Apr 2007 12:21:06 +0000 (+0000)
Subject: getpeuid implementation. Get the uid of a process (by endpoint)
X-Git-Tag: v3.1.4~392
X-Git-Url: http://zhaoyanbai.com/repos/nslookup.html?a=commitdiff_plain;h=69ca935251a4d0acaf0a09439c461c94dcf60cdc;p=minix.git

getpeuid implementation. Get the uid of a process (by endpoint)
---

diff --git a/include/minix/callnr.h b/include/minix/callnr.h
index 20930bc02..1a64ae6c8 100755
--- a/include/minix/callnr.h
+++ b/include/minix/callnr.h
@@ -95,6 +95,7 @@
 #if 0
 #define FREEMEM		106	/* to PM, not used, not implemented */
 #endif
+#define GETPUID		107	/* to PM: get the uid of a process (endpoint) */
 
 #define DEVCTL		120	/* to FS, map or unmap a device */
 #define TASK_REPLY	121	/* to FS: reply code from drivers, not 
diff --git a/include/unistd.h b/include/unistd.h
index c8790f270..3e43c2f1a 100755
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -198,6 +198,7 @@ _PROTOTYPE( int freemem, (phys_bytes size, phys_bytes base)		);
 #define unmapdriver(device) devctl(DEV_UNMAP, 0, device, 0)
 _PROTOTYPE( int devctl, (int ctl_req, int driver, int device, int style, 
 	int force)							);
+_PROTOTYPE( uid_t getpeuid, (endpoint_t ep)				);
 
 /* For compatibility with other Unix systems */
 _PROTOTYPE( int getpagesize, (void)					);
diff --git a/lib/other/Makefile.in b/lib/other/Makefile.in
index 56a9b9668..0528a068b 100644
--- a/lib/other/Makefile.in
+++ b/lib/other/Makefile.in
@@ -44,6 +44,7 @@ libc_FILES=" \
 	getlogin.c \
 	getpagesize.c \
 	getpass.c \
+	getpeuid.c \
 	getpwent.c \
 	getttyent.c \
 	getw.c \
diff --git a/lib/other/getpeuid.c b/lib/other/getpeuid.c
new file mode 100755
index 000000000..4c7e2cd96
--- /dev/null
+++ b/lib/other/getpeuid.c
@@ -0,0 +1,12 @@
+#include <lib.h>
+#include <unistd.h>
+
+PUBLIC uid_t getpeuid(ep)
+endpoint_t ep;
+{
+  message m;
+
+  m.m1_i1= ep;
+  if (_syscall(MM, GETPUID, &m) < 0) return ( (uid_t) -1);
+  return( (uid_t) m.m2_i1);
+}
diff --git a/servers/pm/main.c b/servers/pm/main.c
index 0c2df15ab..f59af00e7 100644
--- a/servers/pm/main.c
+++ b/servers/pm/main.c
@@ -119,6 +119,9 @@ PUBLIC int main()
 	case GETPROCNR:
 		result= do_getprocnr();
 		break;
+	case GETPUID:
+		result= do_getpuid();
+		break;
 	default:
 		/* Else, if the system call number is valid, perform the
 		 * call.
diff --git a/servers/pm/misc.c b/servers/pm/misc.c
index 9aa6bdb2e..70147268d 100644
--- a/servers/pm/misc.c
+++ b/servers/pm/misc.c
@@ -5,6 +5,7 @@
  *   do_procstat: request process status  (Jorrit N. Herder)
  *   do_getsysinfo: request copy of PM data structure  (Jorrit N. Herder)
  *   do_getprocnr: lookup process slot number  (Jorrit N. Herder)
+ *   do_getpuid: get the uid/euid of a process given it's endpoint
  *   do_allocmem: allocate a chunk of memory  (Jorrit N. Herder)
  *   do_freemem: deallocate a chunk of memory  (Jorrit N. Herder)
  *   do_getsetpriority: get/set process priority
@@ -358,6 +359,35 @@ PUBLIC int do_getprocnr()
   return(OK);
 }
 
+/*===========================================================================*
+ *				do_getpuid			             *
+ *===========================================================================*/
+PUBLIC int do_getpuid()
+{
+  register struct mproc *rmp;
+  endpoint_t ep;
+
+  /* This call should be moved to DS. */
+  if (mp->mp_effuid != 0)
+  {
+	printf("PM: unauthorized call of do_getpuid by proc %d\n",
+		mp->mp_endpoint);
+	return EPERM;
+  }
+
+  ep= m_in.endpt;
+
+  for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
+	if ((rmp->mp_flags & IN_USE) && (rmp->mp_endpoint == ep)) {
+		mp->mp_reply.reply_res2 = rmp->mp_effuid;
+		return(rmp->mp_realuid);
+	}
+  } 
+
+  /* Process not found */
+  return(ESRCH);			
+}
+
 /*===========================================================================*
  *				do_reboot				     *
  *===========================================================================*/
diff --git a/servers/pm/proto.h b/servers/pm/proto.h
index 9b9436a91..1cad787a8 100644
--- a/servers/pm/proto.h
+++ b/servers/pm/proto.h
@@ -68,6 +68,7 @@ _PROTOTYPE( int do_sysuname, (void)					);
 _PROTOTYPE( int do_getsysinfo, (void)					);
 _PROTOTYPE( int do_getsysinfo_up, (void)					);
 _PROTOTYPE( int do_getprocnr, (void)					);
+_PROTOTYPE( int do_getpuid, (void)					);
 _PROTOTYPE( int do_svrctl, (void)					);
 _PROTOTYPE( int do_allocmem, (void)					);
 _PROTOTYPE( int do_freemem, (void)					);