The Tor Browser / file comparison
comparison: security/nss/lib/freebl/genload.c
security/nss/lib/freebl/genload.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
equal
deleted
inserted
replaced
| -1:000000000000 | 0:2d26ac53554f |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 /* | |
| 6 * This file is meant to be included by other .c files. | |
| 7 * This file takes a "parameter", the scope which includes this | |
| 8 * code shall declare this variable: | |
| 9 * const char *NameOfThisSharedLib; | |
| 10 * | |
| 11 * NameOfThisSharedLib: | |
| 12 * The file name of the shared library that shall be used as the | |
| 13 * "reference library". The loader will attempt to load the requested | |
| 14 * library from the same directory as the reference library. | |
| 15 */ | |
| 16 | |
| 17 #ifdef XP_UNIX | |
| 18 #include <unistd.h> | |
| 19 #define BL_MAXSYMLINKS 20 | |
| 20 | |
| 21 /* | |
| 22 * If 'link' is a symbolic link, this function follows the symbolic links | |
| 23 * and returns the pathname of the ultimate source of the symbolic links. | |
| 24 * If 'link' is not a symbolic link, this function returns NULL. | |
| 25 * The caller should call PR_Free to free the string returned by this | |
| 26 * function. | |
| 27 */ | |
| 28 static char* loader_GetOriginalPathname(const char* link) | |
| 29 { | |
| 30 #ifdef __GLIBC__ | |
| 31 char* tmp = realpath(link, NULL); | |
| 32 char* resolved; | |
| 33 if (! tmp) | |
| 34 return NULL; | |
| 35 resolved = PR_Malloc(strlen(tmp) + 1); | |
| 36 strcpy(resolved, tmp); /* This is necessary because PR_Free might not be using free() */ | |
| 37 free(tmp); | |
| 38 return resolved; | |
| 39 #else | |
| 40 char* resolved = NULL; | |
| 41 char* input = NULL; | |
| 42 PRUint32 iterations = 0; | |
| 43 PRInt32 len = 0, retlen = 0; | |
| 44 if (!link) { | |
| 45 PR_SetError(PR_INVALID_ARGUMENT_ERROR, 0); | |
| 46 return NULL; | |
| 47 } | |
| 48 len = PR_MAX(1024, strlen(link) + 1); | |
| 49 resolved = PR_Malloc(len); | |
| 50 input = PR_Malloc(len); | |
| 51 if (!resolved || !input) { | |
| 52 if (resolved) { | |
| 53 PR_Free(resolved); | |
| 54 } | |
| 55 if (input) { | |
| 56 PR_Free(input); | |
| 57 } | |
| 58 return NULL; | |
| 59 } | |
| 60 strcpy(input, link); | |
| 61 while ( (iterations++ < BL_MAXSYMLINKS) && | |
| 62 ( (retlen = readlink(input, resolved, len - 1)) > 0) ) { | |
| 63 char* tmp = input; | |
| 64 resolved[retlen] = '\0'; /* NULL termination */ | |
| 65 input = resolved; | |
| 66 resolved = tmp; | |
| 67 } | |
| 68 PR_Free(resolved); | |
| 69 if (iterations == 1 && retlen < 0) { | |
| 70 PR_Free(input); | |
| 71 input = NULL; | |
| 72 } | |
| 73 return input; | |
| 74 #endif | |
| 75 } | |
| 76 #endif /* XP_UNIX */ | |
| 77 | |
| 78 /* | |
| 79 * Load the library with the file name 'name' residing in the same | |
| 80 * directory as the reference library, whose pathname is 'referencePath'. | |
| 81 */ | |
| 82 static PRLibrary * | |
| 83 loader_LoadLibInReferenceDir(const char *referencePath, const char *name) | |
| 84 { | |
| 85 PRLibrary *dlh = NULL; | |
| 86 char *fullName = NULL; | |
| 87 char* c; | |
| 88 PRLibSpec libSpec; | |
| 89 | |
| 90 /* Remove the trailing filename from referencePath and add the new one */ | |
| 91 c = strrchr(referencePath, PR_GetDirectorySeparator()); | |
| 92 if (c) { | |
| 93 size_t referencePathSize = 1 + c - referencePath; | |
| 94 fullName = (char*) PORT_Alloc(strlen(name) + referencePathSize + 1); | |
| 95 if (fullName) { | |
| 96 memcpy(fullName, referencePath, referencePathSize); | |
| 97 strcpy(fullName + referencePathSize, name); | |
| 98 #ifdef DEBUG_LOADER | |
| 99 PR_fprintf(PR_STDOUT, "\nAttempting to load fully-qualified %s\n", | |
| 100 fullName); | |
| 101 #endif | |
| 102 libSpec.type = PR_LibSpec_Pathname; | |
| 103 libSpec.value.pathname = fullName; | |
| 104 dlh = PR_LoadLibraryWithFlags(libSpec, PR_LD_NOW | PR_LD_LOCAL); | |
| 105 PORT_Free(fullName); | |
| 106 } | |
| 107 } | |
| 108 return dlh; | |
| 109 } | |
| 110 | |
| 111 /* | |
| 112 * We use PR_GetLibraryFilePathname to get the pathname of the loaded | |
| 113 * shared lib that contains this function, and then do a PR_LoadLibrary | |
| 114 * with an absolute pathname for the softoken shared library. | |
| 115 */ | |
| 116 | |
| 117 static PRLibrary * | |
| 118 loader_LoadLibrary(const char *nameToLoad) | |
| 119 { | |
| 120 PRLibrary *lib = NULL; | |
| 121 char* fullPath = NULL; | |
| 122 PRLibSpec libSpec; | |
| 123 | |
| 124 /* Get the pathname for nameOfAlreadyLoadedLib, i.e. /usr/lib/libnss3.so | |
| 125 * PR_GetLibraryFilePathname works with either the base library name or a | |
| 126 * function pointer, depending on the platform. We can't query an exported | |
| 127 * symbol such as NSC_GetFunctionList, because on some platforms we can't | |
| 128 * find symbols in loaded implicit dependencies. | |
| 129 * But we can just get the address of this function ! | |
| 130 */ | |
| 131 fullPath = PR_GetLibraryFilePathname(NameOfThisSharedLib, | |
| 132 (PRFuncPtr)&loader_LoadLibrary); | |
| 133 | |
| 134 if (fullPath) { | |
| 135 lib = loader_LoadLibInReferenceDir(fullPath, nameToLoad); | |
| 136 #ifdef XP_UNIX | |
| 137 if (!lib) { | |
| 138 /* | |
| 139 * If fullPath is a symbolic link, resolve the symbolic | |
| 140 * link and try again. | |
| 141 */ | |
| 142 char* originalfullPath = loader_GetOriginalPathname(fullPath); | |
| 143 if (originalfullPath) { | |
| 144 PR_Free(fullPath); | |
| 145 fullPath = originalfullPath; | |
| 146 lib = loader_LoadLibInReferenceDir(fullPath, nameToLoad); | |
| 147 } | |
| 148 } | |
| 149 #endif | |
| 150 PR_Free(fullPath); | |
| 151 } | |
| 152 if (!lib) { | |
| 153 #ifdef DEBUG_LOADER | |
| 154 PR_fprintf(PR_STDOUT, "\nAttempting to load %s\n", nameToLoad); | |
| 155 #endif | |
| 156 libSpec.type = PR_LibSpec_Pathname; | |
| 157 libSpec.value.pathname = nameToLoad; | |
| 158 lib = PR_LoadLibraryWithFlags(libSpec, PR_LD_NOW | PR_LD_LOCAL); | |
| 159 } | |
| 160 if (NULL == lib) { | |
| 161 #ifdef DEBUG_LOADER | |
| 162 PR_fprintf(PR_STDOUT, "\nLoading failed : %s.\n", nameToLoad); | |
| 163 #endif | |
| 164 } | |
| 165 return lib; | |
| 166 } | |
| 167 |
