/* * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ #include "java.h" #include #include #include #include #include #include #include #include #include #include #include "manifest_info.h" #include "version_comp.h" #ifdef __solaris__ #include #else #include #endif #define JVM_DLL "libjvm.so" #define JAVA_DLL "libjava.so" /* help jettison the LD_LIBRARY_PATH settings in the future */ #ifndef SETENV_REQUIRED #define SETENV_REQUIRED #endif /* * If a processor / os combination has the ability to run binaries of * two data models and cohabitation of jre/jdk bits with both data * models is supported, then DUAL_MODE is defined. When DUAL_MODE is * defined, the architecture names for the narrow and wide version of * the architecture are defined in LIBARCH64NAME and LIBARCH32NAME. * Currently only Solaris on sparc/sparcv9 and i586/amd64 is DUAL_MODE; * linux i586/amd64 could be defined as DUAL_MODE but that is not the * current policy. */ #ifdef __solaris__ # define DUAL_MODE # ifndef LIBARCH32NAME # error "The macro LIBARCH32NAME was not defined on the compile line" # endif # ifndef LIBARCH64NAME # error "The macro LIBARCH64NAME was not defined on the compile line" # endif # include # include # include #endif /* pointer to environment */ extern char **environ; /* * A collection of useful strings. One should think of these as #define * entries, but actual strings can be more efficient (with many compilers). */ #ifdef __linux__ static const char *system_dir = "/usr/java"; static const char *user_dir = "/java"; #else /* Solaris */ static const char *system_dir = "/usr/jdk"; static const char *user_dir = "/jdk"; #endif /* Store the name of the executable once computed */ static char *execname = NULL; /* * Flowchart of launcher execs and options processing on unix * * The selection of the proper vm shared library to open depends on * several classes of command line options, including vm "flavor" * options (-client, -server) and the data model options, -d32 and * -d64, as well as a version specification which may have come from * the command line or from the manifest of an executable jar file. * The vm selection options are not passed to the running * virtual machine; they must be screened out by the launcher. * * The version specification (if any) is processed first by the * platform independent routine SelectVersion. This may result in * the exec of the specified launcher version. * * Previously the launcher modified the LD_LIBRARY_PATH appropriately for the * desired data model path, regardless if data models matched or not. The * launcher subsequently exec'ed the desired executable, in order to make the * LD_LIBRARY_PATH path available, for the runtime linker. * * Now, in most cases,the launcher will dlopen the target libjvm.so. All * required libraries are loaded by the runtime linker, using the * $RPATH/$ORIGIN baked into the shared libraries at compile time. Therefore, * in most cases, the launcher will only exec, if the data models are * mismatched, and will not set any environment variables, regardless of the * data models. * * However, if the environment contains a LD_LIBRARY_PATH, this will cause the * launcher to inspect the LD_LIBRARY_PATH. The launcher will check * a. if the LD_LIBRARY_PATH's first component is the the path to the desired * libjvm.so * b. if any other libjvm.so is found in any of the paths. * If case b is true, then the launcher will set the LD_LIBRARY_PATH to the * desired JRE and reexec, in order to propagate the environment. * * Main * (incoming argv) * | * \|/ * SelectVersion * (selects the JRE version, note: not data model) * | * \|/ * CreateExecutionEnvironment * (determines desired data model) * | * | * \|/ * Have Desired Model ? --> NO --> Is Dual-Mode ? --> NO --> Exit(with error) * | | * | | * | \|/ * | YES * | | * | | * | \|/ * | CheckJvmType * | (removes -client, -server etc.) * | | * | | * \|/ \|/ * YES Find the desired executable/library * | | * | | * \|/ \|/ * CheckJvmType RequiresSetenv * (removes -client, -server, etc.) * | * | * \|/ * TranslateDashJArgs... * (Prepare to pass args to vm) * | * | * \|/ * ParseArguments * (removes -d32 and -d64 if any, * processes version options, * creates argument list for vm, * etc.) * | * | * \|/ * RequiresSetenv * Is LD_LIBRARY_PATH * and friends set ? --> NO --> Have Desired Model ? NO --> Re-exec --> Main * YES YES --> Continue * | * | * \|/ * Path is desired JRE ? YES --> Have Desired Model ? NO --> Re-exec --> Main * NO YES --> Continue * | * | * \|/ * Paths have well known * jvm paths ? --> NO --> Have Desired Model ? NO --> Re-exec --> Main * YES YES --> Continue * | * | * \|/ * Does libjvm.so exit * in any of them ? --> NO --> Have Desired Model ? NO --> Re-exec --> Main * YES YES --> Continue * | * | * \|/ * Set the LD_LIBRARY_PATH * | * | * \|/ * Re-exec * | * | * \|/ * Main */ static const char * SetExecname(char **argv); static jboolean GetJVMPath(const char *jrepath, const char *jvmtype, char *jvmpath, jint jvmpathsize, const char * arch); static jboolean GetJREPath(char *path, jint pathsize, const char * arch, jboolean speculative); #define GetArch() GetArchPath(CURRENT_DATA_MODEL) const char * GetArchPath(int nbits) { switch(nbits) { #ifdef DUAL_MODE case 32: return LIBARCH32NAME; case 64: return LIBARCH64NAME; #endif /* DUAL_MODE */ default: return LIBARCHNAME; } } #ifdef SETENV_REQUIRED static jboolean JvmExists(const char *path) { char tmp[PATH_MAX + 1]; struct stat statbuf; JLI_Snprintf(tmp, PATH_MAX, "%s/%s", path, JVM_DLL); if (stat(tmp, &statbuf) == 0) { return JNI_TRUE; } return JNI_FALSE; } /* * contains a lib/$LIBARCH/{server,client}/libjvm.so ? */ static jboolean ContainsLibJVM(int wanted, const char *env) { char clientPattern[PATH_MAX + 1]; char serverPattern[PATH_MAX + 1]; char *envpath; char *path; jboolean clientPatternFound; jboolean serverPatternFound; /* fastest path */ if (env == NULL) { return JNI_FALSE; } /* the usual suspects */ JLI_Snprintf(clientPattern, PATH_MAX, "lib/%s/client", GetArchPath(wanted)); JLI_Snprintf(serverPattern, PATH_MAX, "lib/%s/server", GetArchPath(wanted)); /* to optimize for time, test if any of our usual suspects are present. */ clientPatternFound = JLI_StrStr(env, clientPattern) != NULL; serverPatternFound = JLI_StrStr(env, serverPattern) != NULL; if (clientPatternFound == JNI_FALSE && serverPatternFound == JNI_FALSE) { return JNI_FALSE; } /* * we have a suspicious path component, check if it contains a libjvm.so */ envpath = JLI_StringDup(env); for (path = JLI_StrTok(envpath, ":"); path != NULL; path = JLI_StrTok(NULL, ":")) { if (clientPatternFound && JLI_StrStr(path, clientPattern) != NULL) { if (JvmExists(path)) { JLI_MemFree(envpath); return JNI_TRUE; } } if (serverPatternFound && JLI_StrStr(path, serverPattern) != NULL) { if (JvmExists(path)) { JLI_MemFree(envpath); return JNI_TRUE; } } } JLI_MemFree(envpath); return JNI_FALSE; } /* * Test whether the environment variable needs to be set, see flowchart. */ static jboolean RequiresSetenv(int wanted, const char *jvmpath) { char jpath[PATH_MAX + 1]; char *llp; char *dmllp = NULL; char *p; /* a utility pointer */ llp = getenv("LD_LIBRARY_PATH"); #ifdef __solaris__ dmllp = (CURRENT_DATA_MODEL == 32) ? getenv("LD_LIBRARY_PATH_32") : getenv("LD_LIBRARY_PATH_64"); #endif /* __solaris__ */ /* no environment variable is a good environment variable */ if (llp == NULL && dmllp == NULL) { return JNI_FALSE; } #ifdef __linux /* * On linux, if a binary is running as sgid or suid, glibc sets * LD_LIBRARY_PATH to the empty string for security purposes. (In contrast, * on Solaris the LD_LIBRARY_PATH variable for a privileged binary does not * lose its settings; but the dynamic linker does apply more scrutiny to the * path.) The launcher uses the value of LD_LIBRARY_PATH to prevent an exec * loop, here and further downstream. Therefore, if we are running sgid or * suid, this function's setting of LD_LIBRARY_PATH will be ineffective and * we should case a return from the calling function. Getting the right * libraries will be handled by the RPATH. In reality, this check is * redundant, as the previous check for a non-null LD_LIBRARY_PATH will * return back to the calling function forthwith, it is left here to safe * guard against any changes, in the glibc's existing security policy. */ if ((getgid() != getegid()) || (getuid() != geteuid())) { return JNI_FALSE; } #endif /* __linux */ /* * Prevent recursions. Since LD_LIBRARY_PATH is the one which will be set by * previous versions of the JRE, thus it is the only path that matters here. * So we check to see if the desired JRE is set. */ JLI_StrNCpy(jpath, jvmpath, PATH_MAX); p = JLI_StrRChr(jpath, '/'); *p = '\0'; if (llp != NULL && JLI_StrNCmp(llp, jpath, JLI_StrLen(jpath)) == 0) { return JNI_FALSE; } /* scrutinize all the paths further */ if (llp != NULL && ContainsLibJVM(wanted, llp)) { return JNI_TRUE; } if (dmllp != NULL && ContainsLibJVM(wanted, dmllp)) { return JNI_TRUE; } return JNI_FALSE; } #endif /* SETENV_REQUIRED */ void CreateExecutionEnvironment(int *pargc, char ***pargv, char jrepath[], jint so_jrepath, char jvmpath[], jint so_jvmpath) { /* * First, determine if we are running the desired data model. If we * are running the desired data model, all the error messages * associated with calling GetJREPath, ReadKnownVMs, etc. should be * output. However, if we are not running the desired data model, * some of the errors should be suppressed since it is more * informative to issue an error message based on whether or not the * os/processor combination has dual mode capabilities. */ jboolean jvmpathExists; /* Compute/set the name of the executable */ SetExecname(*pargv); /* Check data model flags, and exec process, if needed */ { char *arch = (char *)GetArch(); /* like sparc or sparcv9 */ char * jvmtype = NULL; int argc = *pargc; char **argv = *pargv; int running = CURRENT_DATA_MODEL; int wanted = running; /* What data mode is being asked for? Current model is fine unless another model is asked for */ #ifdef SETENV_REQUIRED jboolean mustsetenv = JNI_FALSE; char *runpath = NULL; /* existing effective LD_LIBRARY_PATH setting */ char* new_runpath = NULL; /* desired new LD_LIBRARY_PATH string */ char* newpath = NULL; /* path on new LD_LIBRARY_PATH */ char* lastslash = NULL; char** newenvp = NULL; /* current environment */ #ifdef __solaris__ char* dmpath = NULL; /* data model specific LD_LIBRARY_PATH, Solaris only */ #endif /* __solaris__ */ #endif /* SETENV_REQUIRED */ char** newargv = NULL; int newargc = 0; /* * Starting in 1.5, all unix platforms accept the -d32 and -d64 * options. On platforms where only one data-model is supported * (e.g. ia-64 Linux), using the flag for the other data model is * an error and will terminate the program. */ { /* open new scope to declare local variables */ int i; newargv = (char **)JLI_MemAlloc((argc+1) * sizeof(char*)); newargv[newargc++] = argv[0]; /* scan for data model arguments and remove from argument list; last occurrence determines desired data model */ for (i=1; i < argc; i++) { if (JLI_StrCmp(argv[i], "-J-d64") == 0 || JLI_StrCmp(argv[i], "-d64") == 0) { wanted = 64; continue; } if (JLI_StrCmp(argv[i], "-J-d32") == 0 || JLI_StrCmp(argv[i], "-d32") == 0) { wanted = 32; continue; } newargv[newargc++] = argv[i]; if (IsJavaArgs()) { if (argv[i][0] != '-') continue; } else { if (JLI_StrCmp(argv[i], "-classpath") == 0 || JLI_StrCmp(argv[i], "-cp") == 0) { i++; if (i >= argc) break; newargv[newargc++] = argv[i]; continue; } if (argv[i][0] != '-') { i++; break; } } } /* copy rest of args [i .. argc) */ while (i < argc) { newargv[newargc++] = argv[i++]; } newargv[newargc] = NULL; /* * newargv has all proper arguments here */ argc = newargc; argv = newargv; } /* If the data model is not changing, it is an error if the jvmpath does not exist */ if (wanted == running) { /* Find out where the JRE is that we will be using. */ if (!GetJREPath(jrepath, so_jrepath, arch, JNI_FALSE) ) { JLI_ReportErrorMessage(JRE_ERROR1); exit(2); } /* Find the specified JVM type */ if (ReadKnownVMs(jrepath, arch, JNI_FALSE) < 1) { JLI_ReportErrorMessage(CFG_ERROR7); exit(1); } jvmpath[0] = '\0'; jvmtype = CheckJvmType(pargc, pargv, JNI_FALSE); if (JLI_StrCmp(jvmtype, "ERROR") == 0) { JLI_ReportErrorMessage(CFG_ERROR9); exit(4); } if (!GetJVMPath(jrepath, jvmtype, jvmpath, so_jvmpath, arch )) { JLI_ReportErrorMessage(CFG_ERROR8, jvmtype, jvmpath); exit(4); } /* * we seem to have everything we need, so without further ado * we return back, otherwise proceed to set the environment. */ #ifdef SETENV_REQUIRED mustsetenv = RequiresSetenv(wanted, jvmpath); JLI_TraceLauncher("mustsetenv: %s\n", mustsetenv ? "TRUE" : "FALSE"); if (mustsetenv == JNI_FALSE) { return; } #else return; #endif /* SETENV_REQUIRED */ } else { /* do the same speculatively or exit */ #ifdef DUAL_MODE if (running != wanted) { /* Find out where the JRE is that we will be using. */ if (!GetJREPath(jrepath, so_jrepath, GetArchPath(wanted), JNI_TRUE)) { /* give up and let other code report error message */ JLI_ReportErrorMessage(JRE_ERROR2, wanted); exit(1); } /* * Read in jvm.cfg for target data model and process vm * selection options. */ if (ReadKnownVMs(jrepath, GetArchPath(wanted), JNI_TRUE) < 1) { /* give up and let other code report error message */ JLI_ReportErrorMessage(JRE_ERROR2, wanted); exit(1); } jvmpath[0] = '\0'; jvmtype = CheckJvmType(pargc, pargv, JNI_TRUE); if (JLI_StrCmp(jvmtype, "ERROR") == 0) { JLI_ReportErrorMessage(CFG_ERROR9); exit(4); } /* exec child can do error checking on the existence of the path */ jvmpathExists = GetJVMPath(jrepath, jvmtype, jvmpath, so_jvmpath, GetArchPath(wanted)); #ifdef SETENV_REQUIRED mustsetenv = RequiresSetenv(wanted, jvmpath); #endif /* SETENV_REQUIRED */ } #else JLI_ReportErrorMessage(JRE_ERROR2, wanted); exit(1); #endif } #ifdef SETENV_REQUIRED if (mustsetenv) { /* * We will set the LD_LIBRARY_PATH as follows: * * o $JVMPATH (directory portion only) * o $JRE/lib/$LIBARCHNAME * o $JRE/../lib/$LIBARCHNAME * * followed by the user's previous effective LD_LIBRARY_PATH, if * any. */ #ifdef __solaris__ /* * Starting in Solaris 7, ld.so.1 supports three LD_LIBRARY_PATH * variables: * * 1. LD_LIBRARY_PATH -- used for 32 and 64 bit searches if * data-model specific variables are not set. * * 2. LD_LIBRARY_PATH_64 -- overrides and replaces LD_LIBRARY_PATH * for 64-bit binaries. * * 3. LD_LIBRARY_PATH_32 -- overrides and replaces LD_LIBRARY_PATH * for 32-bit binaries. * * The vm uses LD_LIBRARY_PATH to set the java.library.path system * property. To shield the vm from the complication of multiple * LD_LIBRARY_PATH variables, if the appropriate data model * specific variable is set, we will act as if LD_LIBRARY_PATH had * the value of the data model specific variant and the data model * specific variant will be unset. Note that the variable for the * *wanted* data model must be used (if it is set), not simply the * current running data model. */ switch (wanted) { case 0: if (running == 32) { dmpath = getenv("LD_LIBRARY_PATH_32"); wanted = 32; } else { dmpath = getenv("LD_LIBRARY_PATH_64"); wanted = 64; } break; case 32: dmpath = getenv("LD_LIBRARY_PATH_32"); break; case 64: dmpath = getenv("LD_LIBRARY_PATH_64"); break; default: JLI_ReportErrorMessage(JRE_ERROR3, __LINE__); exit(1); /* unknown value in wanted */ break; } /* * If dmpath is NULL, the relevant data model specific variable is * not set and normal LD_LIBRARY_PATH should be used. */ if (dmpath == NULL) { runpath = getenv("LD_LIBRARY_PATH"); } else { runpath = dmpath; } #else /* * If not on Solaris, assume only a single LD_LIBRARY_PATH * variable. */ runpath = getenv("LD_LIBRARY_PATH"); #endif /* __solaris__ */ /* runpath contains current effective LD_LIBRARY_PATH setting */ jvmpath = JLI_StringDup(jvmpath); new_runpath = JLI_MemAlloc(((runpath != NULL) ? JLI_StrLen(runpath) : 0) + 2 * JLI_StrLen(jrepath) + 2 * JLI_StrLen(arch) + JLI_StrLen(jvmpath) + 52); newpath = new_runpath + JLI_StrLen("LD_LIBRARY_PATH="); /* * Create desired LD_LIBRARY_PATH value for target data model. */ { /* remove the name of the .so from the JVM path */ lastslash = JLI_StrRChr(jvmpath, '/'); if (lastslash) *lastslash = '\0'; sprintf(new_runpath, "LD_LIBRARY_PATH=" "%s:" "%s/lib/%s:" "%s/../lib/%s", jvmpath, #ifdef DUAL_MODE jrepath, GetArchPath(wanted), jrepath, GetArchPath(wanted) #else jrepath, arch, jrepath, arch #endif ); /* * Check to make sure that the prefix of the current path is the * desired environment variable setting, though the RequiresSetenv * checks if the desired runpath exists, this logic does a more * comprehensive check. */ if (runpath != NULL && JLI_StrNCmp(newpath, runpath, JLI_StrLen(newpath)) == 0 && (runpath[JLI_StrLen(newpath)] == 0 || runpath[JLI_StrLen(newpath)] == ':') && (running == wanted) /* data model does not have to be changed */ #ifdef __solaris__ && (dmpath == NULL) /* data model specific variables not set */ #endif ) { return; } } /* * Place the desired environment setting onto the prefix of * LD_LIBRARY_PATH. Note that this prevents any possible infinite * loop of execv() because we test for the prefix, above. */ if (runpath != 0) { JLI_StrCat(new_runpath, ":"); JLI_StrCat(new_runpath, runpath); } if (putenv(new_runpath) != 0) { exit(1); /* problem allocating memory; LD_LIBRARY_PATH not set properly */ } /* * Unix systems document that they look at LD_LIBRARY_PATH only * once at startup, so we have to re-exec the current executable * to get the changed environment variable to have an effect. */ #ifdef __solaris__ /* * If dmpath is not NULL, remove the data model specific string * in the environment for the exec'ed child. */ if (dmpath != NULL) (void)UnsetEnv((wanted == 32) ? "LD_LIBRARY_PATH_32" : "LD_LIBRARY_PATH_64"); #endif newenvp = environ; } #endif /* SETENV_REQUIRED */ { char *newexec = execname; #ifdef DUAL_MODE /* * If the data model is being changed, the path to the * executable must be updated accordingly; the executable name * and directory the executable resides in are separate. In the * case of 32 => 64, the new bits are assumed to reside in, e.g. * "olddir/LIBARCH64NAME/execname"; in the case of 64 => 32, * the bits are assumed to be in "olddir/../execname". For example, * * olddir/sparcv9/execname * olddir/amd64/execname * * for Solaris SPARC and Linux amd64, respectively. */ if (running != wanted) { char *oldexec = JLI_StrCpy(JLI_MemAlloc(JLI_StrLen(execname) + 1), execname); char *olddir = oldexec; char *oldbase = JLI_StrRChr(oldexec, '/'); newexec = JLI_MemAlloc(JLI_StrLen(execname) + 20); *oldbase++ = 0; sprintf(newexec, "%s/%s/%s", olddir, ((wanted == 64) ? LIBARCH64NAME : ".."), oldbase); argv[0] = newexec; } #endif /* DUAL_MODE */ JLI_TraceLauncher("TRACER_MARKER:About to EXEC\n"); (void) fflush(stdout); (void) fflush(stderr); #ifdef SETENV_REQUIRED if (mustsetenv) { execve(newexec, argv, newenvp); } else { execv(newexec, argv); } #else execv(newexec, argv); #endif /* SETENV_REQUIRED */ JLI_ReportErrorMessageSys(JRE_ERROR4, newexec); #ifdef DUAL_MODE if (running != wanted) { JLI_ReportErrorMessage(JRE_ERROR5, wanted, running); #ifdef __solaris__ #ifdef __sparc JLI_ReportErrorMessage(JRE_ERROR6); #else JLI_ReportErrorMessage(JRE_ERROR7); #endif /* __sparc */ } #endif /* __solaris__ */ #endif /* DUAL_MODE */ } exit(1); } } /* * On Solaris VM choosing is done by the launcher (java.c). */ static jboolean GetJVMPath(const char *jrepath, const char *jvmtype, char *jvmpath, jint jvmpathsize, const char * arch) { struct stat s; if (JLI_StrChr(jvmtype, '/')) { JLI_Snprintf(jvmpath, jvmpathsize, "%s/" JVM_DLL, jvmtype); } else { JLI_Snprintf(jvmpath, jvmpathsize, "%s/lib/%s/%s/" JVM_DLL, jrepath, arch, jvmtype); } JLI_TraceLauncher("Does `%s' exist ... ", jvmpath); if (stat(jvmpath, &s) == 0) { JLI_TraceLauncher("yes.\n"); return JNI_TRUE; } else { JLI_TraceLauncher("no.\n"); return JNI_FALSE; } } /* * Find path to JRE based on .exe's location or registry settings. */ static jboolean GetJREPath(char *path, jint pathsize, const char * arch, jboolean speculative) { char libjava[MAXPATHLEN]; if (GetApplicationHome(path, pathsize)) { /* Is JRE co-located with the application? */ JLI_Snprintf(libjava, sizeof(libjava), "%s/lib/%s/" JAVA_DLL, path, arch); if (access(libjava, F_OK) == 0) { JLI_TraceLauncher("JRE path is %s\n", path); return JNI_TRUE; } /* Does the app ship a private JRE in /jre directory? */ JLI_Snprintf(libjava, sizeof(libjava), "%s/jre/lib/%s/" JAVA_DLL, path, arch); if (access(libjava, F_OK) == 0) { JLI_StrCat(path, "/jre"); JLI_TraceLauncher("JRE path is %s\n", path); return JNI_TRUE; } } if (!speculative) JLI_ReportErrorMessage(JRE_ERROR8 JAVA_DLL); return JNI_FALSE; } jboolean LoadJavaVM(const char *jvmpath, InvocationFunctions *ifn) { void *libjvm; JLI_TraceLauncher("JVM path is %s\n", jvmpath); libjvm = dlopen(jvmpath, RTLD_NOW + RTLD_GLOBAL); if (libjvm == NULL) { #if defined(__solaris__) && defined(__sparc) && !defined(_LP64) /* i.e. 32-bit sparc */ FILE * fp; Elf32_Ehdr elf_head; int count; int location; fp = fopen(jvmpath, "r"); if (fp == NULL) { JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); return JNI_FALSE; } /* read in elf header */ count = fread((void*)(&elf_head), sizeof(Elf32_Ehdr), 1, fp); fclose(fp); if (count < 1) { JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); return JNI_FALSE; } /* * Check for running a server vm (compiled with -xarch=v8plus) * on a stock v8 processor. In this case, the machine type in * the elf header would not be included the architecture list * provided by the isalist command, which is turn is gotten from * sysinfo. This case cannot occur on 64-bit hardware and thus * does not have to be checked for in binaries with an LP64 data * model. */ if (elf_head.e_machine == EM_SPARC32PLUS) { char buf[257]; /* recommended buffer size from sysinfo man page */ long length; char* location; length = sysinfo(SI_ISALIST, buf, 257); if (length > 0) { location = JLI_StrStr(buf, "sparcv8plus "); if (location == NULL) { JLI_ReportErrorMessage(JVM_ERROR3); return JNI_FALSE; } } } #endif JLI_ReportErrorMessage(DLL_ERROR1, __LINE__); JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); return JNI_FALSE; } ifn->CreateJavaVM = (CreateJavaVM_t) dlsym(libjvm, "JNI_CreateJavaVM"); if (ifn->CreateJavaVM == NULL) { JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); return JNI_FALSE; } ifn->GetDefaultJavaVMInitArgs = (GetDefaultJavaVMInitArgs_t) dlsym(libjvm, "JNI_GetDefaultJavaVMInitArgs"); if (ifn->GetDefaultJavaVMInitArgs == NULL) { JLI_ReportErrorMessage(DLL_ERROR2, jvmpath, dlerror()); return JNI_FALSE; } return JNI_TRUE; } /* * If app is "/foo/bin/javac", or "/foo/bin/sparcv9/javac" then put * "/foo" into buf. */ jboolean GetApplicationHome(char *buf, jint bufsize) { if (execname != NULL) { JLI_Snprintf(buf, bufsize, "%s", execname); buf[bufsize-1] = '\0'; } else { return JNI_FALSE; } if (JLI_StrRChr(buf, '/') == 0) { buf[0] = '\0'; return JNI_FALSE; } *(JLI_StrRChr(buf, '/')) = '\0'; /* executable file */ if (JLI_StrLen(buf) < 4 || JLI_StrRChr(buf, '/') == 0) { buf[0] = '\0'; return JNI_FALSE; } if (JLI_StrCmp("/bin", buf + JLI_StrLen(buf) - 4) != 0) *(JLI_StrRChr(buf, '/')) = '\0'; /* sparcv9 or amd64 */ if (JLI_StrLen(buf) < 4 || JLI_StrCmp("/bin", buf + JLI_StrLen(buf) - 4) != 0) { buf[0] = '\0'; return JNI_FALSE; } *(JLI_StrRChr(buf, '/')) = '\0'; /* bin */ return JNI_TRUE; } /* * Return true if the named program exists */ static int ProgramExists(char *name) { struct stat sb; if (stat(name, &sb) != 0) return 0; if (S_ISDIR(sb.st_mode)) return 0; return (sb.st_mode & S_IEXEC) != 0; } /* * Find a command in a directory, returning the path. */ static char * Resolve(char *indir, char *cmd) { char name[PATH_MAX + 2], *real; if ((JLI_StrLen(indir) + JLI_StrLen(cmd) + 1) > PATH_MAX) return 0; JLI_Snprintf(name, sizeof(name), "%s%c%s", indir, FILE_SEPARATOR, cmd); if (!ProgramExists(name)) return 0; real = JLI_MemAlloc(PATH_MAX + 2); if (!realpath(name, real)) JLI_StrCpy(real, name); return real; } /* * Find a path for the executable */ static char * FindExecName(char *program) { char cwdbuf[PATH_MAX+2]; char *path; char *tmp_path; char *f; char *result = NULL; /* absolute path? */ if (*program == FILE_SEPARATOR || (FILE_SEPARATOR=='\\' && JLI_StrRChr(program, ':'))) return Resolve("", program+1); /* relative path? */ if (JLI_StrRChr(program, FILE_SEPARATOR) != 0) { char buf[PATH_MAX+2]; return Resolve(getcwd(cwdbuf, sizeof(cwdbuf)), program); } /* from search path? */ path = getenv("PATH"); if (!path || !*path) path = "."; tmp_path = JLI_MemAlloc(JLI_StrLen(path) + 2); JLI_StrCpy(tmp_path, path); for (f=tmp_path; *f && result==0; ) { char *s = f; while (*f && (*f != PATH_SEPARATOR)) ++f; if (*f) *f++ = 0; if (*s == FILE_SEPARATOR) result = Resolve(s, program); else { /* relative path element */ char dir[2*PATH_MAX]; JLI_Snprintf(dir, sizeof(dir), "%s%c%s", getcwd(cwdbuf, sizeof(cwdbuf)), FILE_SEPARATOR, s); result = Resolve(dir, program); } if (result != 0) break; } JLI_MemFree(tmp_path); return result; } /* * Compute the name of the executable * * In order to re-exec securely we need the absolute path of the * executable. On Solaris getexecname(3c) may not return an absolute * path so we use dladdr to get the filename of the executable and * then use realpath to derive an absolute path. From Solaris 9 * onwards the filename returned in DL_info structure from dladdr is * an absolute pathname so technically realpath isn't required. * On Linux we read the executable name from /proc/self/exe. * As a fallback, and for platforms other than Solaris and Linux, * we use FindExecName to compute the executable name. */ static const char* SetExecname(char **argv) { char* exec_path = NULL; #if defined(__solaris__) { Dl_info dlinfo; int (*fptr)(); fptr = (int (*)())dlsym(RTLD_DEFAULT, "main"); if (fptr == NULL) { JLI_ReportErrorMessage(DLL_ERROR3, dlerror()); return JNI_FALSE; } if (dladdr((void*)fptr, &dlinfo)) { char *resolved = (char*)JLI_MemAlloc(PATH_MAX+1); if (resolved != NULL) { exec_path = realpath(dlinfo.dli_fname, resolved); if (exec_path == NULL) { JLI_MemFree(resolved); } } } } #elif defined(__linux__) { const char* self = "/proc/self/exe"; char buf[PATH_MAX+1]; int len = readlink(self, buf, PATH_MAX); if (len >= 0) { buf[len] = '\0'; /* readlink doesn't nul terminate */ exec_path = JLI_StringDup(buf); } } #else /* !__solaris__ && !__linux */ { /* Not implemented */ } #endif if (exec_path == NULL) { exec_path = FindExecName(argv[0]); } execname = exec_path; return exec_path; } void JLI_ReportErrorMessage(const char* fmt, ...) { va_list vl; va_start(vl, fmt); vfprintf(stderr, fmt, vl); fprintf(stderr, "\n"); va_end(vl); } void JLI_ReportErrorMessageSys(const char* fmt, ...) { va_list vl; char *emsg; /* * TODO: its safer to use strerror_r but is not available on * Solaris 8. Until then.... */ emsg = strerror(errno); if (emsg != NULL) { fprintf(stderr, "%s\n", emsg); } va_start(vl, fmt); vfprintf(stderr, fmt, vl); fprintf(stderr, "\n"); va_end(vl); } void JLI_ReportExceptionDescription(JNIEnv * env) { (*env)->ExceptionDescribe(env); } /* * Since using the file system as a registry is a bit risky, perform * additional sanity checks on the identified directory to validate * it as a valid jre/sdk. * * Return 0 if the tests fail; otherwise return non-zero (true). * * Note that checking for anything more than the existence of an * executable object at bin/java relative to the path being checked * will break the regression tests. */ static int CheckSanity(char *path, char *dir) { char buffer[PATH_MAX]; if (JLI_StrLen(path) + JLI_StrLen(dir) + 11 > PATH_MAX) return (0); /* Silently reject "impossibly" long paths */ JLI_Snprintf(buffer, sizeof(buffer), "%s/%s/bin/java", path, dir); return ((access(buffer, X_OK) == 0) ? 1 : 0); } /* * Determine if there is an acceptable JRE in the directory dirname. * Upon locating the "best" one, return a fully qualified path to * it. "Best" is defined as the most advanced JRE meeting the * constraints contained in the manifest_info. If no JRE in this * directory meets the constraints, return NULL. * * Note that we don't check for errors in reading the directory * (which would be done by checking errno). This is because it * doesn't matter if we get an error reading the directory, or * we just don't find anything interesting in the directory. We * just return NULL in either case. * * The historical names of j2sdk and j2re were changed to jdk and * jre respecively as part of the 1.5 rebranding effort. Since the * former names are legacy on Linux, they must be recognized for * all time. Fortunately, this is a minor cost. */ static char *ProcessDir(manifest_info *info, char *dirname) { DIR *dirp; struct dirent *dp; char *best = NULL; int offset; int best_offset = 0; char *ret_str = NULL; char buffer[PATH_MAX]; if ((dirp = opendir(dirname)) == NULL) return (NULL); do { if ((dp = readdir(dirp)) != NULL) { offset = 0; if ((JLI_StrNCmp(dp->d_name, "jre", 3) == 0) || (JLI_StrNCmp(dp->d_name, "jdk", 3) == 0)) offset = 3; else if (JLI_StrNCmp(dp->d_name, "j2re", 4) == 0) offset = 4; else if (JLI_StrNCmp(dp->d_name, "j2sdk", 5) == 0) offset = 5; if (offset > 0) { if ((JLI_AcceptableRelease(dp->d_name + offset, info->jre_version)) && CheckSanity(dirname, dp->d_name)) if ((best == NULL) || (JLI_ExactVersionId( dp->d_name + offset, best + best_offset) > 0)) { if (best != NULL) JLI_MemFree(best); best = JLI_StringDup(dp->d_name); best_offset = offset; } } } } while (dp != NULL); (void) closedir(dirp); if (best == NULL) return (NULL); else { ret_str = JLI_MemAlloc(JLI_StrLen(dirname) + JLI_StrLen(best) + 2); sprintf(ret_str, "%s/%s", dirname, best); JLI_MemFree(best); return (ret_str); } } /* * This is the global entry point. It examines the host for the optimal * JRE to be used by scanning a set of directories. The set of directories * is platform dependent and can be overridden by the environment * variable JAVA_VERSION_PATH. * * This routine itself simply determines the set of appropriate * directories before passing control onto ProcessDir(). */ char* LocateJRE(manifest_info* info) { char *path; char *home; char *target = NULL; char *dp; char *cp; /* * Start by getting JAVA_VERSION_PATH */ if (info->jre_restrict_search) { path = JLI_StringDup(system_dir); } else if ((path = getenv("JAVA_VERSION_PATH")) != NULL) { path = JLI_StringDup(path); } else { if ((home = getenv("HOME")) != NULL) { path = (char *)JLI_MemAlloc(JLI_StrLen(home) + \ JLI_StrLen(system_dir) + JLI_StrLen(user_dir) + 2); sprintf(path, "%s%s:%s", home, user_dir, system_dir); } else { path = JLI_StringDup(system_dir); } } /* * Step through each directory on the path. Terminate the scan with * the first directory with an acceptable JRE. */ cp = dp = path; while (dp != NULL) { cp = JLI_StrChr(dp, (int)':'); if (cp != NULL) *cp = '\0'; if ((target = ProcessDir(info, dp)) != NULL) break; dp = cp; if (dp != NULL) dp++; } JLI_MemFree(path); return (target); } /* * Given a path to a jre to execute, this routine checks if this process * is indeed that jre. If not, it exec's that jre. * * We want to actually check the paths rather than just the version string * built into the executable, so that given version specification (and * JAVA_VERSION_PATH) will yield the exact same Java environment, regardless * of the version of the arbitrary launcher we start with. */ void ExecJRE(char *jre, char **argv) { char wanted[PATH_MAX]; const char* progname = GetProgramName(); /* * Resolve the real path to the directory containing the selected JRE. */ if (realpath(jre, wanted) == NULL) { JLI_ReportErrorMessage(JRE_ERROR9, jre); exit(1); } /* * Resolve the real path to the currently running launcher. */ SetExecname(argv); if (execname == NULL) { JLI_ReportErrorMessage(JRE_ERROR10); exit(1); } /* * If the path to the selected JRE directory is a match to the initial * portion of the path to the currently executing JRE, we have a winner! * If so, just return. */ if (JLI_StrNCmp(wanted, execname, JLI_StrLen(wanted)) == 0) return; /* I am the droid you were looking for */ /* * This should never happen (because of the selection code in SelectJRE), * but check for "impossibly" long path names just because buffer overruns * can be so deadly. */ if (JLI_StrLen(wanted) + JLI_StrLen(progname) + 6 > PATH_MAX) { JLI_ReportErrorMessage(JRE_ERROR11); exit(1); } /* * Construct the path and exec it. */ (void)JLI_StrCat(JLI_StrCat(wanted, "/bin/"), progname); argv[0] = JLI_StringDup(progname); if (JLI_IsTraceLauncher()) { int i; printf("ReExec Command: %s (%s)\n", wanted, argv[0]); printf("ReExec Args:"); for (i = 1; argv[i] != NULL; i++) printf(" %s", argv[i]); printf("\n"); } JLI_TraceLauncher("TRACER_MARKER:About to EXEC\n"); (void)fflush(stdout); (void)fflush(stderr); execv(wanted, argv); JLI_ReportErrorMessageSys(JRE_ERROR12, wanted); exit(1); } /* * "Borrowed" from Solaris 10 where the unsetenv() function is being added * to libc thanks to SUSv3 (Standard Unix Specification, version 3). As * such, in the fullness of time this will appear in libc on all relevant * Solaris/Linux platforms and maybe even the Windows platform. At that * time, this stub can be removed. * * This implementation removes the environment locking for multithreaded * applications. (We don't have access to these mutexes within libc and * the launcher isn't multithreaded.) Note that what remains is platform * independent, because it only relies on attributes that a POSIX environment * defines. * * Returns 0 on success, -1 on failure. * * Also removed was the setting of errno. The only value of errno set * was EINVAL ("Invalid Argument"). */ /* * s1(environ) is name=value * s2(name) is name(not the form of name=value). * if names match, return value of 1, else return 0 */ static int match_noeq(const char *s1, const char *s2) { while (*s1 == *s2++) { if (*s1++ == '=') return (1); } if (*s1 == '=' && s2[-1] == '\0') return (1); return (0); } /* * added for SUSv3 standard * * Delete entry from environ. * Do not free() memory! Other threads may be using it. * Keep it around forever. */ static int borrowed_unsetenv(const char *name) { long idx; /* index into environ */ if (name == NULL || *name == '\0' || JLI_StrChr(name, '=') != NULL) { return (-1); } for (idx = 0; environ[idx] != NULL; idx++) { if (match_noeq(environ[idx], name)) break; } if (environ[idx] == NULL) { /* name not found but still a success */ return (0); } /* squeeze up one entry */ do { environ[idx] = environ[idx+1]; } while (environ[++idx] != NULL); return (0); } /* --- End of "borrowed" code --- */ /* * Wrapper for unsetenv() function. */ int UnsetEnv(char *name) { return(borrowed_unsetenv(name)); } /* --- Splash Screen shared library support --- */ static const char* SPLASHSCREEN_SO = "libsplashscreen.so"; static void* hSplashLib = NULL; void* SplashProcAddress(const char* name) { if (!hSplashLib) { hSplashLib = dlopen(SPLASHSCREEN_SO, RTLD_LAZY | RTLD_GLOBAL); } if (hSplashLib) { void* sym = dlsym(hSplashLib, name); return sym; } else { return NULL; } } void SplashFreeLibrary() { if (hSplashLib) { dlclose(hSplashLib); hSplashLib = NULL; } } const char * jlong_format_specifier() { return "%lld"; } /* * Block current thread and continue execution in a new thread */ int ContinueInNewThread0(int (JNICALL *continuation)(void *), jlong stack_size, void * args) { int rslt; #ifdef __solaris__ thread_t tid; long flags = 0; if (thr_create(NULL, stack_size, (void *(*)(void *))continuation, args, flags, &tid) == 0) { void * tmp; thr_join(tid, NULL, &tmp); rslt = (int)tmp; } else { /* See above. Continue in current thread if thr_create() failed */ rslt = continuation(args); } #else pthread_t tid; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE); if (stack_size > 0) { pthread_attr_setstacksize(&attr, stack_size); } if (pthread_create(&tid, &attr, (void *(*)(void*))continuation, (void*)args) == 0) { void * tmp; pthread_join(tid, &tmp); rslt = (int)tmp; } else { /* * Continue execution in current thread if for some reason (e.g. out of * memory/LWP) a new thread can't be created. This will likely fail * later in continuation as JNI_CreateJavaVM needs to create quite a * few new threads, anyway, just give it a try.. */ rslt = continuation(args); } pthread_attr_destroy(&attr); #endif return rslt; } /* Coarse estimation of number of digits assuming the worst case is a 64-bit pid. */ #define MAX_PID_STR_SZ 20 void SetJavaLauncherPlatformProps() { /* Linux only */ #ifdef __linux__ const char *substr = "-Dsun.java.launcher.pid="; char *pid_prop_str = (char *)JLI_MemAlloc(JLI_StrLen(substr) + MAX_PID_STR_SZ + 1); sprintf(pid_prop_str, "%s%d", substr, getpid()); AddOption(pid_prop_str, NULL); #endif } jboolean IsJavaw() { /* noop on UNIX */ return JNI_FALSE; } void InitLauncher(jboolean javaw) { JLI_SetTraceLauncher(); } /* * The implementation for finding classes from the bootstrap * class loader, refer to java.h */ static FindClassFromBootLoader_t *findBootClass = NULL; jclass FindBootStrapClass(JNIEnv *env, const char* classname) { if (findBootClass == NULL) { findBootClass = (FindClassFromBootLoader_t *)dlsym(RTLD_DEFAULT, "JVM_FindClassFromBootLoader"); if (findBootClass == NULL) { JLI_ReportErrorMessage(DLL_ERROR4, "JVM_FindClassFromBootLoader"); return NULL; } } return findBootClass(env, classname); }