* Added breakpad support for Linux.

thirdparty/breakpad/common/solaris/file_id.cc

@@ -0,0 +1,197 @@
+// Copyright (c) 2007, Google Inc.
+// All rights reserved.
+//
+// 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 Inc. 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
+
+#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;
+}
+
+FileID::FileID(const char *path) {
+  strcpy(path_, path);
+}
+
+class AutoCloser {
+ public:
+  AutoCloser(int fd) : fd_(fd) {}
+  ~AutoCloser() { if (fd_) close(fd_); }
+ private:
+  int fd_;
+};
+
+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;
+}
+
+}  // namespace google_breakpad