| // Copyright 2013 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/process/process_iterator.h" |
| |
| #include <errno.h> |
| #include <stddef.h> |
| #include <sys/sysctl.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include "base/logging.h" |
| #include "base/strings/string_split.h" |
| #include "base/strings/string_util.h" |
| |
| namespace base { |
| |
| ProcessIterator::ProcessIterator(const ProcessFilter* filter) |
| : filter_(filter) { |
| // Get a snapshot of all of my processes (yes, as we loop it can go stale, but |
| // but trying to find where we were in a constantly changing list is basically |
| // impossible. |
| |
| int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_UID, |
| static_cast<int>(geteuid()) }; |
| |
| // Since more processes could start between when we get the size and when |
| // we get the list, we do a loop to keep trying until we get it. |
| bool done = false; |
| int try_num = 1; |
| const int max_tries = 10; |
| do { |
| // Get the size of the buffer |
| size_t len = 0; |
| if (sysctl(mib, std::size(mib), NULL, &len, NULL, 0) < 0) { |
| DLOG(ERROR) << "failed to get the size needed for the process list"; |
| kinfo_procs_.resize(0); |
| done = true; |
| } else { |
| size_t num_of_kinfo_proc = len / sizeof(struct kinfo_proc); |
| // Leave some spare room for process table growth (more could show up |
| // between when we check and now) |
| num_of_kinfo_proc += 16; |
| kinfo_procs_.resize(num_of_kinfo_proc); |
| len = num_of_kinfo_proc * sizeof(struct kinfo_proc); |
| // Load the list of processes |
| if (sysctl(mib, std::size(mib), &kinfo_procs_[0], &len, NULL, 0) < 0) { |
| // If we get a mem error, it just means we need a bigger buffer, so |
| // loop around again. Anything else is a real error and give up. |
| if (errno != ENOMEM) { |
| DLOG(ERROR) << "failed to get the process list"; |
| kinfo_procs_.resize(0); |
| done = true; |
| } |
| } else { |
| // Got the list, just make sure we're sized exactly right |
| kinfo_procs_.resize(len / sizeof(struct kinfo_proc)); |
| done = true; |
| } |
| } |
| } while (!done && (try_num++ < max_tries)); |
| |
| if (!done) { |
| DLOG(ERROR) << "failed to collect the process list in a few tries"; |
| kinfo_procs_.resize(0); |
| } |
| } |
| |
| ProcessIterator::~ProcessIterator() = default; |
| |
| bool ProcessIterator::CheckForNextProcess() { |
| std::string data; |
| for (; index_of_kinfo_proc_ < kinfo_procs_.size(); ++index_of_kinfo_proc_) { |
| kinfo_proc& kinfo = kinfo_procs_[index_of_kinfo_proc_]; |
| |
| // Skip processes just awaiting collection |
| if ((kinfo.kp_proc.p_pid > 0) && (kinfo.kp_proc.p_stat == SZOMB)) |
| continue; |
| |
| int mib[] = { CTL_KERN, KERN_PROCARGS, kinfo.kp_proc.p_pid }; |
| |
| // Find out what size buffer we need. |
| size_t data_len = 0; |
| if (sysctl(mib, std::size(mib), NULL, &data_len, NULL, 0) < 0) { |
| DVPLOG(1) << "failed to figure out the buffer size for a commandline"; |
| continue; |
| } |
| |
| data.resize(data_len); |
| if (sysctl(mib, std::size(mib), &data[0], &data_len, NULL, 0) < 0) { |
| DVPLOG(1) << "failed to fetch a commandline"; |
| continue; |
| } |
| |
| // |data| contains all the command line parameters of the process, separated |
| // by blocks of one or more null characters. We tokenize |data| into a |
| // vector of strings using '\0' as a delimiter and populate |
| // |entry_.cmd_line_args_|. |
| std::string delimiters; |
| delimiters.push_back('\0'); |
| entry_.cmd_line_args_ = SplitString(data, delimiters, |
| KEEP_WHITESPACE, SPLIT_WANT_NONEMPTY); |
| |
| // |data| starts with the full executable path followed by a null character. |
| // We search for the first instance of '\0' and extract everything before it |
| // to populate |entry_.exe_file_|. |
| size_t exec_name_end = data.find('\0'); |
| if (exec_name_end == std::string::npos) { |
| DLOG(ERROR) << "command line data didn't match expected format"; |
| continue; |
| } |
| |
| entry_.pid_ = kinfo.kp_proc.p_pid; |
| entry_.ppid_ = kinfo.kp_eproc.e_ppid; |
| entry_.gid_ = kinfo.kp_eproc.e_pgid; |
| size_t last_slash = data.rfind('/', exec_name_end); |
| if (last_slash == std::string::npos) |
| entry_.exe_file_.assign(data, 0, exec_name_end); |
| else |
| entry_.exe_file_.assign(data, last_slash + 1, |
| exec_name_end - last_slash - 1); |
| // Start w/ the next entry next time through |
| ++index_of_kinfo_proc_; |
| // Done |
| return true; |
| } |
| return false; |
| } |
| |
| bool NamedProcessIterator::IncludeEntry() { |
| const bool name_match = |
| use_prefix_match_ ? base::StartsWith(entry().exe_file(), executable_name_) |
| : executable_name_ == entry().exe_file(); |
| return name_match && ProcessIterator::IncludeEntry(); |
| } |
| |
| } // namespace base |