Respect Linux user prefs with regards to crash reporting.

This involves implementing GoogleUpdateSettings::[GS]etCollectStatsConsent, and a whole lot of refactoring.

BUG=none
TEST=delete config dir, run official Linux build, don't enable crash reporting, crash browser -> no crash reporting.
Review URL: http://codereview.chromium.org/115808

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17104 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 94 insertions, 3 deletions

diff --git a/chrome/app/breakpad_linux.cc b/chrome/app/breakpad_linux.cc
index ca1e91e..237ed98 100644
--- a/chrome/app/breakpad_linux.cc
+++ b/chrome/app/breakpad_linux.cc
@@ -2,19 +2,25 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include <unistd.h>
 #include <fcntl.h>
 #include <sys/socket.h>
 #include <sys/uio.h>
+#include <unistd.h>
 
+#include <string>
+
+#include "base/command_line.h"
 #include "base/eintr_wrapper.h"
-#include "base/rand_util.h"
 #include "base/file_version_info_linux.h"
+#include "base/path_service.h"
+#include "base/rand_util.h"
 #include "breakpad/linux/directory_reader.h"
 #include "breakpad/linux/exception_handler.h"
 #include "breakpad/linux/linux_libc_support.h"
 #include "breakpad/linux/linux_syscall_support.h"
 #include "breakpad/linux/memory.h"
+#include "chrome/common/chrome_switches.h"
+#include "chrome/installer/util/google_update_settings.h"
 
 static const char kUploadURL[] =
     "https://clients2.google.com/cr/report";
@@ -349,7 +355,7 @@ pid_t UploadCrashDump(const char* filename, const char* crash_url,
     };
 
     execv("/usr/bin/wget", const_cast<char**>(args));
-    static const char msg[] = "Cannot update crash dump: cannot exec "
+    static const char msg[] = "Cannot upload crash dump: cannot exec "
                               "/usr/bin/wget\n";
     sys_write(2, msg, sizeof(msg) - 1);
     sys__exit(1);
@@ -390,3 +396,88 @@ void EnableCrashDumping() {
   new google_breakpad::ExceptionHandler("/tmp", NULL, CrashDone, NULL,
                                         true /* install handlers */);
 }
+
+// This is defined in chrome/renderer/renderer_logging_linux.cc, it's the
+// static string containing the current active URL. We send this in the crash
+// report.
+namespace renderer_logging {
+extern std::string active_url;
+}
+
+static bool
+RendererCrashHandler(const void* crash_context, size_t crash_context_size,
+             void* context) {
+  const int fd = (int) context;
+  int fds[2];
+  pipe(fds);
+
+  // The length of the control message:
+  static const unsigned kControlMsgSize =
+      CMSG_SPACE(sizeof(int)) + CMSG_SPACE(sizeof(struct ucred));
+
+  union {
+    struct kernel_msghdr msg;
+    struct msghdr sys_msg;
+  };
+  my_memset(&msg, 0, sizeof(struct kernel_msghdr));
+  struct kernel_iovec iov[2];
+  iov[0].iov_base = const_cast<void*>(crash_context);
+  iov[0].iov_len = crash_context_size;
+  iov[1].iov_base = const_cast<char*>(renderer_logging::active_url.data());
+  iov[1].iov_len = renderer_logging::active_url.size();
+
+  msg.msg_iov = iov;
+  msg.msg_iovlen = 2;
+  char cmsg[kControlMsgSize];
+  memset(cmsg, 0, kControlMsgSize);
+  msg.msg_control = cmsg;
+  msg.msg_controllen = sizeof(cmsg);
+
+  struct cmsghdr *hdr = CMSG_FIRSTHDR(&msg);
+  hdr->cmsg_level = SOL_SOCKET;
+  hdr->cmsg_type = SCM_RIGHTS;
+  hdr->cmsg_len = CMSG_LEN(sizeof(int));
+  *((int*) CMSG_DATA(hdr)) = fds[1];
+  hdr = CMSG_NXTHDR(&sys_msg, hdr);
+  hdr->cmsg_level = SOL_SOCKET;
+  hdr->cmsg_type = SCM_CREDENTIALS;
+  hdr->cmsg_len = CMSG_LEN(sizeof(struct ucred));
+  struct ucred *cred = reinterpret_cast<struct ucred*>(CMSG_DATA(hdr));
+  cred->uid = getuid();
+  cred->gid = getgid();
+  cred->pid = getpid();
+
+  HANDLE_EINTR(sys_sendmsg(fd, &msg, 0));
+  sys_close(fds[1]);
+
+  char b;
+  HANDLE_EINTR(sys_read(fds[0], &b, 1));
+
+  return true;
+}
+
+void EnableRendererCrashDumping() {
+  // When the browser forks off our process, it installs the crash signal file
+  // descriptor in this slot:
+  static const int kMagicCrashSignalFd = 4;
+
+  // We deliberately leak this object.
+  google_breakpad::ExceptionHandler* handler =
+      new google_breakpad::ExceptionHandler("" /* unused */, NULL, NULL,
+                                            (void*) kMagicCrashSignalFd, true);
+  handler->set_crash_handler(RendererCrashHandler);
+}
+
+void InitCrashReporter() {
+  if (!GoogleUpdateSettings::GetCollectStatsConsent())
+    return;
+
+  // Determine the process type and take appropriate action.
+  const CommandLine& parsed_command_line = *CommandLine::ForCurrentProcess();
+  const std::wstring process_type =
+      parsed_command_line.GetSwitchValue(switches::kProcessType);
+  if (process_type.empty())
+    EnableCrashDumping();
+  else if (process_type == switches::kRendererProcess)
+    EnableRendererCrashDumping();
+}