X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=src%2Fvserver-info.c;fp=src%2Fvserver-info.c;h=9a7d6e2056f6559002f310bece353339c13bb775;hb=8cf13bb177d92c93eb73dc8939777150536c2d00;hp=0000000000000000000000000000000000000000;hpb=6bf3f95de36c804c97716b2d0bdf10680c559044;p=util-vserver.git

diff --git a/src/vserver-info.c b/src/vserver-info.c
new file mode 100644
index 0000000..9a7d6e2
--- /dev/null
+++ b/src/vserver-info.c
@@ -0,0 +1,585 @@
+// $Id: vserver-info.c,v 1.23 2005/07/04 22:36:46 ensc Exp $    --*- c -*--
+
+// Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
+//  
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; version 2 of the License.
+//  
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//  
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "lib/utils-legacy.h"
+#include "pathconfig.h"
+#include "util.h"
+
+#include "internal.h"
+#include "vserver.h"
+
+#include <stdlib.h>
+#include <getopt.h>
+#include <assert.h>
+#include <stdbool.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/utsname.h>
+#include <dirent.h>
+#include <strings.h>
+
+#define ENSC_WRAPPERS_FCNTL	1
+#define ENSC_WRAPPERS_IO	1
+#define ENSC_WRAPPERS_UNISTD	1
+#define ENSC_WRAPPERS_VSERVER	1
+#include <wrappers.h>
+
+#undef _POSIX_SOURCE
+#include "capability-compat.h"
+
+typedef enum { tgNONE,tgCONTEXT, tgID, tgRUNNING,
+	       tgVDIR, tgNAME, tgCFGDIR, tgAPPDIR,
+	       tgAPIVER, tgPXID,
+	       tgINITPID, tgINITPID_PID,
+	       tgXID, tgUTS, tgSYSINFO,
+	       tgFEATURE, tgCANONIFY,
+	       tgVERIFYCAP, tgXIDTYPE, tgVERIFYPROC,
+}	VserverTag;
+
+static struct {
+    char const * const	tag;
+    VserverTag const	val;
+    char const * const	descr;
+}  const TAGS[] = {
+  { "CONTEXT", tgCONTEXT, ("the current and/or assigned context; when an optinal argument "
+			   "evaluates to false,only the current context will be printed") },
+  { "ID",      tgID,      "gives out the vserver-id for the context-xid" },
+  { "RUNNING", tgRUNNING, "gives out '1' when vserver is running; else, it fails without output" },
+  { "VDIR",    tgVDIR,    "gives out the root-directory of the vserver" },
+  { "NAME",    tgNAME,    "gives out the name of the vserver" },
+  { "CFGDIR",  tgCFGDIR,  "gives out the configuration directory of the vserver" },
+  { "APPDIR",  tgAPPDIR,  "gives out the name of the toplevel application cfgdir" },
+  { "INITPID",     tgINITPID,     "gives out the initpid of the given context" },
+  { "INITPID_PID", tgINITPID_PID, "gives out the initpid of the given pid" },
+  { "XID",         tgXID,         "gives out the context-id of the given pid" },
+  { "APIVER",      tgAPIVER,      "gives out the version of the kernel API" },
+  { "UTS",         tgUTS,         ("gives out an uts-entry; possible entries are "
+				   "context, sysname, nodename, release, version, "
+				   "machine and domainname") },
+  { "SYSINFO",     tgSYSINFO,     "gives out information about the systen" },
+  { "FEATURE",     tgFEATURE,     "returns 0 iff the queried feature is supported" },
+  { "PXID",        tgPXID,        "returns the xid of the parent context" },
+  { "CANONIFY",    tgCANONIFY,    "canonifies the vserver-name and removes dangerous characters" },
+  { "VERIFYCAP",   tgVERIFYCAP,   "test if the kernel supports linux capabilities" },
+  { "VERIFYPROC",  tgVERIFYPROC,  "test if /proc can be read by contexts!=0" },
+  { "XIDTYPE",     tgXIDTYPE,     "returns the type of the given XID" },
+};
+
+int wrapper_exit_code = 1;
+
+static struct option const
+CMDLINE_OPTIONS[] = {
+  { "help",     no_argument,  0, 'h' },
+  { "version",  no_argument,  0, 'v' },
+  { 0,0,0,0 }
+};
+
+
+static void
+showHelp(int fd, char const *cmd, int res)
+{
+  WRITE_MSG(fd, "Usage:  ");
+  WRITE_STR(fd, cmd);
+  WRITE_MSG(fd,
+	    " [-ql] <vserver>|<pid>|<context> <tag>\n"
+	    "Please report bugs to " PACKAGE_BUGREPORT "\n");
+  exit(res);
+}
+
+static void
+showVersion()
+{
+  WRITE_MSG(1,
+	    "vserver-info " VERSION " -- returns information about vservers\n"
+	    "This program is part of " PACKAGE_STRING "\n\n"
+	    "Copyright (C) 2003 Enrico Scholz\n"
+	    VERSION_COPYRIGHT_DISCLAIMER);
+  exit(0);
+}
+
+static void
+showTags()
+{
+  char const *		delim = "";
+  size_t	i;
+
+  WRITE_MSG(1, "Valid tags are: ");
+  for (i=0; i<DIM_OF(TAGS); ++i) {
+    WRITE_STR(1, delim);
+    WRITE_STR(1, TAGS[i].tag);
+
+    delim = ", ";
+  }
+  WRITE_MSG(1, "\n");
+  exit(0);
+}
+
+static VserverTag
+stringToTag(char const *str)
+{
+  size_t	i;
+  for (i=0; i<DIM_OF(TAGS); ++i)
+    if (strcmp(TAGS[i].tag, str)==0) return TAGS[i].val;
+
+  return tgNONE;
+}
+
+static vc_uts_type
+utsText2Tag(char const *str)
+{
+  if      (strcmp(str, "context")   ==0) return vcVHI_CONTEXT;
+  else if (strcmp(str, "sysname")   ==0) return vcVHI_SYSNAME;
+  else if (strcmp(str, "nodename")  ==0) return vcVHI_NODENAME;
+  else if (strcmp(str, "release")   ==0) return vcVHI_RELEASE;
+  else if (strcmp(str, "version")   ==0) return vcVHI_VERSION;
+  else if (strcmp(str, "machine")   ==0) return vcVHI_MACHINE;
+  else if (strcmp(str, "domainname")==0) return vcVHI_DOMAINNAME;
+  else {
+    WRITE_MSG(2, "Unknown UTS tag\n");
+    exit(1);
+  }
+}
+
+static bool
+verifyProc()
+{
+  char const		*errptr;
+  
+  if (!switchToWatchXid(&errptr)) {
+    perror(errptr);
+    return false;
+  }
+
+  if (access("/proc/uptime", R_OK)==-1) {
+    if (errno!=ENOENT)
+      perror("access(\"/proc/uptime\")");
+    
+    return false;
+  }
+
+  return true;
+}
+
+static bool
+verifyCap()
+{
+  struct __user_cap_header_struct header;
+  struct __user_cap_data_struct user;
+  header.version = _LINUX_CAPABILITY_VERSION;
+  header.pid     = 0;
+
+  if (getuid()!=0) {
+    WRITE_MSG(2, "'VERIFYCAP' can be executed as root only\n");
+    return false;
+  }
+
+//  if( prctl( PR_SET_KEEPCAPS, 1,0,0,0 ) < 0 ) {
+//    perror( "prctl:" );
+//    return false;
+//  }
+  
+  if (capget(&header, &user)==-1) {
+    perror("capget()");
+    return false;
+  }
+
+  user.effective   = 0;
+  user.permitted   = 0;
+  user.inheritable = 0;
+
+  if (capset(&header, &user)==-1) {
+    perror("capset()");
+    return false;
+  }
+
+  return chroot("/")==-1;
+}
+
+static char *
+getAPIVer(char *buf)
+{
+  int		v = vc_get_version();
+  size_t	l;
+  
+  if (v==-1) return 0;
+
+  
+  l = utilvserver_fmt_xulong(0, (unsigned int)v);
+  memcpy(buf, "0x00000000", 10);
+  utilvserver_fmt_xulong(buf+2+8-l, (unsigned int)v);
+
+  return buf;
+}
+
+static char *
+getXid(char *buf, char const *pid_str)
+{
+  pid_t		pid = atoi(pid_str);
+  xid_t		xid = vc_get_task_xid(pid);
+
+  if (xid==VC_NOCTX) perror("vc_get_task_xid()");
+  else {
+    utilvserver_fmt_long(buf, xid);
+    return buf;
+  }
+
+  return 0;
+}
+
+static char *
+getPXid(char UNUSED *buf, char const UNUSED *vserver)
+{
+  // TODO: implement me when available
+  return 0;
+}
+
+static char *
+getInitPid_native(char *buf, xid_t xid)
+{
+  struct vc_vx_info		info;
+  
+  if (vc_get_vx_info(xid, &info)==-1) perror("vc_get_vx_info()");
+  else {
+    utilvserver_fmt_long(buf, info.initpid);
+    return buf;
+  }
+
+  return 0;
+}
+
+#if defined(VC_ENABLE_API_COMPAT) || defined(VC_ENABLE_API_V11)
+static int
+selectPid(struct dirent const *ent)
+{
+  return atoi(ent->d_name)!=0;
+}
+
+static bool
+getInitPid_internal(pid_t pid, xid_t xid, pid_t *res)
+{
+  *res = -1;
+  
+  for (;*res==-1;) {
+    size_t			bufsize = utilvserver_getProcEntryBufsize();
+    char			buf[bufsize+1];
+    char			*pos = 0;
+
+    pos = utilvserver_getProcEntry(pid, "\ns_context: ", buf, bufsize);
+    if (pos==0 && errno==EAGAIN) continue;
+
+    if (pos==0 || (xid_t)atoi(pos)!=xid) return false;
+
+    buf[bufsize] = '\0';
+    pos          = strstr(buf, "\ninitpid: ");
+    
+    if (pos!=0) {
+      pos       += sizeof("\ninitpid: ")-1;
+      if (strncmp(pos, "none", 4)==0) *res = -1;
+      else                            *res = atoi(pos);
+    }
+  }
+
+  return true;
+}
+
+static char *
+getInitPid_emulated(char *buf, xid_t xid)
+{
+  struct dirent **namelist;
+  int		n;
+
+  switchToWatchXid(0);	// ignore errors silently...
+  n = scandir("/proc", &namelist, selectPid, alphasort);
+  if (n<0) perror("scandir()");
+  else while (n--) {
+    pid_t	pid;
+    if (!getInitPid_internal(atoi(namelist[n]->d_name), xid, &pid)) continue;
+
+    utilvserver_fmt_long(buf, pid);
+    return buf;
+  }
+
+  return 0;
+}
+#endif // VC_ENABLE_API_COMPAT
+
+static char *
+getInitPid(char *buf, xid_t xid)
+{
+  if (vc_isSupported(vcFEATURE_VINFO))
+    return getInitPid_native(buf, xid);
+  else
+    return getInitPid_emulated(buf, xid);
+}
+
+static char *
+getInitPidPid(char *buf, char const *vserver)
+{
+  struct vc_vx_info	info;
+  pid_t			pid = atoi(vserver);
+  xid_t 		xid = vc_get_task_xid(pid);
+
+  if (xid==VC_NOCTX) perror("vc_get_task_xid()");
+  else if (vc_get_vx_info(xid, &info)==-1) perror("vc_get_vx_info()");
+  else {
+    utilvserver_fmt_long(buf, info.initpid);
+    return buf;
+  }
+
+  return 0;
+}
+
+static char *
+getUTS(char *buf, xid_t xid, size_t argc, char * argv[])
+{
+  if (argc>0) {
+    vc_uts_type	type = utsText2Tag(argv[0]);
+    if (vc_get_vhi_name(xid, type, buf, sizeof(buf)-1)==-1)
+      perror("vc_get_vhi_name()");
+    else
+      return buf;
+  }
+  else {
+    bool		is_passed = false;
+    char		tmp[128];
+#define APPEND_UTS(TYPE)						\
+    (((vc_get_vhi_name(xid, TYPE, tmp, sizeof(tmp)-1)!=-1) && (strcat(buf, tmp), strcat(buf, " "), is_passed=true)) || \
+     (strcat(buf, "??? ")))
+
+    if (APPEND_UTS(vcVHI_CONTEXT) &&
+	APPEND_UTS(vcVHI_SYSNAME) &&
+	APPEND_UTS(vcVHI_NODENAME) &&
+	APPEND_UTS(vcVHI_RELEASE) &&
+	APPEND_UTS(vcVHI_VERSION) &&
+	APPEND_UTS(vcVHI_MACHINE) &&
+	APPEND_UTS(vcVHI_DOMAINNAME) &&
+	is_passed)
+      return buf;
+
+    perror("vc_get_vhi_name()");
+#undef APPEND_UTS
+  }
+
+  return 0;
+}
+
+static int
+printSysInfo(char *buf)
+{
+  int			fd = open(PKGLIBDIR "/FEATURES.txt", O_RDONLY);
+  struct utsname	uts;
+
+  if (uname(&uts)==-1)
+    perror("uname()");
+  else {
+    WRITE_MSG(1,
+	      "Versions:\n"
+	      "                   Kernel: ");
+    WRITE_STR(1, uts.release);
+    WRITE_MSG(1, "\n"
+	      "                   VS-API: ");
+
+    memset(buf, 0, 128);
+    if (getAPIVer(buf)) WRITE_STR(1, buf);
+    else                WRITE_MSG(1, "???");
+    
+    WRITE_MSG(1, "\n"
+	      "             util-vserver: " PACKAGE_VERSION "; " __DATE__ ", " __TIME__"\n"
+	      "\n");
+  }
+
+  if (fd==-1)
+    WRITE_MSG(1, "FEATURES.txt not found\n");
+  else {
+    off_t		l  = Elseek(fd, 0, SEEK_END);
+    Elseek(fd, 0, SEEK_SET);
+    {
+      char		buf[l];
+      EreadAll(fd, buf, l);
+      EwriteAll(1, buf, l);
+    }
+    Eclose(fd);
+  }
+
+  return EXIT_SUCCESS;
+}
+
+static char *
+getContext(char *buf, char const *vserver, bool allow_only_static)
+{
+  xid_t		xid = vc_getVserverCtx(vserver, vcCFG_AUTO,
+				       allow_only_static, 0);
+  if (xid==VC_NOCTX) return 0;
+  
+  utilvserver_fmt_long(buf, xid);
+  return buf;
+}
+
+static char const *
+getXIDType(xid_t xid, int argc, char *argv[])
+{
+  char const *		tp;
+  
+  switch (vc_getXIDType(xid)) {
+    case vcTYPE_INVALID		:  tp = "invalid"; break;
+    case vcTYPE_MAIN		:  tp = "main";    break;
+    case vcTYPE_WATCH		:  tp = "watch";   break;
+    case vcTYPE_STATIC		:  tp = "static";  break;
+    case vcTYPE_DYNAMIC		:  tp = "dynamic"; break;
+    default			:  tp = 0;         break;
+  }
+
+  if (argc==0 || tp==0)
+    return tp;
+
+  while (argc>0) {
+    --argc;
+    if (strcasecmp(argv[argc], tp)==0) return tp;
+  }
+
+  return 0;
+}
+
+static int
+testFeature(int argc, char *argv[])
+{
+  return (argc>0 && vc_isSupportedString(argv[0])) ? EXIT_SUCCESS : EXIT_FAILURE;
+}
+
+static bool
+str2bool(char const *str)
+{
+  return atoi(str)!=0 || strchr("yYtT", str[0])!=0 || strcasecmp("true", str)==0;
+}
+
+static int
+execQuery(char const *vserver, VserverTag tag, int argc, char *argv[])
+{
+  char const *		res = 0;
+  char 			buf[sizeof(xid_t)*4 + 1024 + strlen(vserver)];
+
+  memset(buf, 0, sizeof buf);
+  switch (tag) {
+    case tgNAME		:  res = vc_getVserverName(vserver, vcCFG_AUTO); break;
+    case tgVDIR		:
+      res = vc_getVserverVdir(vserver, vcCFG_AUTO, argc>0 && atoi(argv[0]));
+      break;
+    case tgCFGDIR	:  res = vc_getVserverCfgDir(vserver, vcCFG_AUTO);     break;
+    case tgAPPDIR	:
+      res = vc_getVserverAppDir(vserver, vcCFG_AUTO, argc==0 ? "" : argv[0]);
+      break;
+      
+    case tgRUNNING	: {
+      signed long		xid;	// type is a small hack, but should be ok...
+      struct vc_vx_info		info;
+	
+      if (isNumber(vserver, &xid) && xid>=0)
+	res = (vc_get_vx_info(xid, &info)==-1) ? 0 : "1";
+      else
+	res = (vc_getVserverCtx(vserver, vcCFG_AUTO, false, 0)==VC_NOCTX) ? 0 : "1";
+      
+      break;
+    }
+
+    case tgCANONIFY	:
+      strcpy(buf, vserver);
+      if (canonifyVserverName(buf)>0) res = buf;
+      break;
+      
+    case tgCONTEXT	:  res = getContext(buf, vserver,
+					    argc==0 || str2bool(argv[0])); break;
+    case tgINITPID_PID	:  res = getInitPidPid(buf, vserver);  break;
+    case tgAPIVER	:  res = getAPIVer(buf);               break;
+    case tgXID		:  res = getXid(buf, vserver);         break;
+    case tgPXID		:  res = getPXid(buf, vserver);        break;
+    case tgSYSINFO	:  return printSysInfo(buf);           break;
+    case tgFEATURE	:  return testFeature(argc,argv);      break;
+    case tgVERIFYCAP	:  return verifyCap() ? 0 : 1;         break;
+    case tgVERIFYPROC	:  return verifyProc() ? 0 : 1;        break;
+
+
+    default		: {
+      xid_t		xid = *vserver!='\0' ? vc_xidopt2xid(vserver,true,0) : VC_SAMECTX;
+
+      switch (tag) {
+	case tgID	:  res = vc_getVserverByCtx(xid,0,0);  break;
+	case tgINITPID	:  res = getInitPid(buf, xid);         break;
+	case tgUTS	:  res = getUTS(buf, xid, argc, argv); break;
+	case tgXIDTYPE	:  res = getXIDType(xid, argc, argv);  break;
+    
+	default		:  assert(false); abort();  // TODO
+      }
+    }
+  }
+
+  if (res==0) return EXIT_FAILURE;
+  WRITE_STR(1, res);
+  WRITE_MSG(1, "\n");
+  return EXIT_SUCCESS;
+}
+
+int main(int argc, char *argv[])
+{
+  bool		quiet = false;
+  char const *	vserver;
+  VserverTag	tag;
+  
+  while (1) {
+    int		c = getopt_long(argc, argv, "ql", CMDLINE_OPTIONS, 0);
+    if (c==-1) break;
+
+    switch (c) {
+      case 'h'		:  showHelp(1, argv[0], 0);
+      case 'v'		:  showVersion();
+      case 'l'		:  showTags();
+      case 'q'		:  quiet = true; break;
+      default		:
+	WRITE_MSG(2, "Try '");
+	WRITE_STR(2, argv[0]);
+	WRITE_MSG(2, " --help\" for more information.\n");
+	exit(1);
+	break;
+    }
+  }
+
+  if (optind+2>argc) {
+    execQuery("-", tgSYSINFO, 0, 0);
+    WRITE_MSG(2, "\nAssumed 'SYSINFO' as no other option given; try '--help' for more information.\n");
+    exit(0);
+  }
+
+  vserver = argv[optind];
+  tag     = stringToTag(argv[optind+1]);
+
+  if (tag==tgNONE) {
+    WRITE_MSG(2, "Unknown tag; use '-l' to get list of valid tags\n");
+    exit(1);
+  }
+
+  if (quiet) {
+    int		fd = Eopen("/dev/null", O_WRONLY, 0644);
+    Edup2(fd, 1);
+    Eclose(fd);
+  }
+
+  return execQuery(vserver, tag, argc-(optind+2), argv+optind+2);
+}