diff options
Diffstat (limited to 'externals/breakpad/src/common/solaris/file_id.cc')
| -rw-r--r-- | externals/breakpad/src/common/solaris/file_id.cc | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/externals/breakpad/src/common/solaris/file_id.cc b/externals/breakpad/src/common/solaris/file_id.cc new file mode 100644 index 0000000000..5a9982bb42 --- /dev/null +++ b/externals/breakpad/src/common/solaris/file_id.cc @@ -0,0 +1,203 @@ +// Copyright 2007 Google LLC +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google LLC nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +// file_id.cc: Return a unique identifier for a file +// +// See file_id.h for documentation +// +// Author: Alfred Peng + +#ifdef HAVE_CONFIG_H +#include <config.h> // Must come first +#endif + +#include <elf.h> +#include <fcntl.h> +#include <gelf.h> +#include <sys/mman.h> +#include <sys/ksyms.h> +#include <stdio.h> +#include <string.h> +#include <unistd.h> + +#include <cassert> +#include <cstdio> + +#include "common/md5.h" +#include "common/solaris/file_id.h" +#include "common/solaris/message_output.h" +#include "google_breakpad/common/minidump_format.h" + +namespace google_breakpad { + +class AutoElfEnder { + public: + AutoElfEnder(Elf* elf) : elf_(elf) {} + ~AutoElfEnder() { if (elf_) elf_end(elf_); } + private: + Elf* elf_; +}; + +// Find the text section in elf object file. +// Return the section start address and the size. +static bool FindElfTextSection(int fd, const void* elf_base, + const void** text_start, + int* text_size) { + assert(text_start); + assert(text_size); + + *text_start = NULL; + *text_size = 0; + + if (elf_version(EV_CURRENT) == EV_NONE) { + print_message2(2, "elf_version() failed: %s\n", elf_errmsg(0)); + return false; + } + + GElf_Ehdr elf_header; + lseek(fd, 0L, 0); + Elf* elf = elf_begin(fd, ELF_C_READ, NULL); + AutoElfEnder elfEnder(elf); + + if (gelf_getehdr(elf, &elf_header) == (GElf_Ehdr*)NULL) { + print_message2(2, "failed to read elf header: %s\n", elf_errmsg(-1)); + return false; + } + + if (elf_header.e_ident[EI_MAG0] != ELFMAG0 || + elf_header.e_ident[EI_MAG1] != ELFMAG1 || + elf_header.e_ident[EI_MAG2] != ELFMAG2 || + elf_header.e_ident[EI_MAG3] != ELFMAG3) { + print_message1(2, "header magic doesn't match\n"); + return false; + } + + static const char kTextSectionName[] = ".text"; + const GElf_Shdr* text_section = NULL; + Elf_Scn* scn = NULL; + GElf_Shdr shdr; + + while ((scn = elf_nextscn(elf, scn)) != NULL) { + if (gelf_getshdr(scn, &shdr) == (GElf_Shdr*)0) { + print_message2(2, "failed to read section header: %s\n", elf_errmsg(0)); + return false; + } + + if (shdr.sh_type == SHT_PROGBITS) { + const char* section_name = elf_strptr(elf, elf_header.e_shstrndx, + shdr.sh_name); + if (!section_name) { + print_message2(2, "Section name error: %s\n", elf_errmsg(-1)); + continue; + } + + if (strcmp(section_name, kTextSectionName) == 0) { + text_section = &shdr; + break; + } + } + } + if (text_section != NULL && text_section->sh_size > 0) { + *text_start = (char*)elf_base + text_section->sh_offset; + *text_size = text_section->sh_size; + return true; + } + + return false; +} + +class AutoCloser { + public: + AutoCloser(int fd) : fd_(fd) {} + ~AutoCloser() { if (fd_) close(fd_); } + private: + int fd_; +}; + +namespace elf { + +FileID::FileID(const char* path) { + strcpy(path_, path); +} + +bool FileID::ElfFileIdentifier(unsigned char identifier[16]) { + int fd = 0; + if ((fd = open(path_, O_RDONLY)) < 0) + return false; + + AutoCloser autocloser(fd); + struct stat st; + if (fstat(fd, &st) != 0 || st.st_size <= 0) + return false; + + void* base = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0); + if (base == MAP_FAILED) + return false; + + bool success = false; + const void* text_section = NULL; + int text_size = 0; + + if (FindElfTextSection(fd, base, &text_section, &text_size)) { + MD5Context md5; + MD5Init(&md5); + MD5Update(&md5, (const unsigned char*)text_section, text_size); + MD5Final(identifier, &md5); + success = true; + } + + munmap((char*)base, st.st_size); + return success; +} + +// static +bool FileID::ConvertIdentifierToString(const unsigned char identifier[16], + char* buffer, int buffer_length) { + if (buffer_length < 34) + return false; + + int buffer_idx = 0; + for (int idx = 0; idx < 16; ++idx) { + int hi = (identifier[idx] >> 4) & 0x0F; + int lo = (identifier[idx]) & 0x0F; + + buffer[buffer_idx++] = (hi >= 10) ? 'A' + hi - 10 : '0' + hi; + buffer[buffer_idx++] = (lo >= 10) ? 'A' + lo - 10 : '0' + lo; + } + + // Add an extra "0" by the end. + buffer[buffer_idx++] = '0'; + + // NULL terminate + buffer[buffer_idx] = 0; + + return true; +} + +} // elf +} // namespace google_breakpad |