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Diffstat (limited to 'src/plugins/CCpp.cpp')
| -rw-r--r-- | src/plugins/CCpp.cpp | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/src/plugins/CCpp.cpp b/src/plugins/CCpp.cpp new file mode 100644 index 00000000..fad9cf62 --- /dev/null +++ b/src/plugins/CCpp.cpp @@ -0,0 +1,279 @@ +/* + CCpp.cpp + + Copyright (C) 2009 Zdenek Prikryl (zprikryl@redhat.com) + Copyright (C) 2009 RedHat inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +*/ +#include <set> +#include "abrtlib.h" +#include "CCpp.h" +#include "abrt_exception.h" +#include "comm_layer_inner.h" +#include "Polkit.h" + +using namespace std; + +#define CORE_PATTERN_IFACE "/proc/sys/kernel/core_pattern" +#define CORE_PATTERN "|"CCPP_HOOK_PATH" "DEBUG_DUMPS_DIR" %p %s %u %c" +#define CORE_PIPE_LIMIT_IFACE "/proc/sys/kernel/core_pipe_limit" +/* core_pipe_limit specifies how many dump_helpers might run at the same time +0 - means unlimited, but the it's not guaranteed that /proc/<pid> of crashing +process might not be available for dump_helper +4 - means that 4 dump_helpers can run at the same time, which should be enough +for ABRT, we can miss some crashes, but what are the odds that more processes +crash at the same time? This value has been recommended by nhorman +*/ +#define CORE_PIPE_LIMIT "4" + +#define DEBUGINFO_CACHE_DIR LOCALSTATEDIR"/cache/abrt-di" + +CAnalyzerCCpp::CAnalyzerCCpp() : + m_bBacktrace(true), + m_bBacktraceRemotes(false), + m_bMemoryMap(false), + m_bInstallDebugInfo(true), + m_nDebugInfoCacheMB(4000), + m_nGdbTimeoutSec(60) +{} + +/* + this is just a workaround until kernel changes it's behavior + when handling pipes in core_pattern +*/ +#ifdef HOSTILE_KERNEL +#define CORE_SIZE_PATTERN "Max core file size=1:unlimited" +static int isdigit_str(char *str) +{ + do { + if (*str < '0' || *str > '9') + return 0; + } while (*++str); + return 1; +} + +static int set_limits() +{ + DIR *dir = opendir("/proc"); + if (!dir) { + /* this shouldn't fail, but to be safe.. */ + return 1; + } + + struct dirent *ent; + while ((ent = readdir(dir)) != NULL) { + if (!isdigit_str(ent->d_name)) + continue; + + char limits_name[sizeof("/proc/%s/limits") + sizeof(long)*3]; + snprintf(limits_name, sizeof(limits_name), "/proc/%s/limits", ent->d_name); + FILE *limits_fp = fopen(limits_name, "r"); + if (!limits_fp) { + break; + } + + char line[128]; + char *ulimit_c = NULL; + while (1) { + if (fgets(line, sizeof(line)-1, limits_fp) == NULL) + break; + if (strncmp(line, "Max core file size", sizeof("Max core file size")-1) == 0) { + ulimit_c = skip_whitespace(line + sizeof("Max core file size")-1); + skip_non_whitespace(ulimit_c)[0] = '\0'; + break; + } + } + fclose(limits_fp); + if (!ulimit_c || ulimit_c[0] != '0' || ulimit_c[1] != '\0') { + /*process has nonzero ulimit -c, so need to modify it*/ + continue; + } + /* echo -n 'Max core file size=1:unlimited' >/proc/PID/limits */ + int fd = open(limits_name, O_WRONLY); + if (fd >= 0) { + errno = 0; + /*full_*/ + ssize_t n = write(fd, CORE_SIZE_PATTERN, sizeof(CORE_SIZE_PATTERN)-1); + if (n < sizeof(CORE_SIZE_PATTERN)-1) + log("warning: can't write core_size limit to: %s", limits_name); + close(fd); + } + else + { + log("warning: can't open %s for writing", limits_name); + } + } + closedir(dir); + return 0; +} +#endif /* HOSTILE_KERNEL */ + +void CAnalyzerCCpp::Init() +{ + FILE *fp = fopen(CORE_PATTERN_IFACE, "r"); + if (fp) + { + char line[PATH_MAX]; + if (fgets(line, sizeof(line), fp)) + m_sOldCorePattern = line; + fclose(fp); + } + if (m_sOldCorePattern[0] == '|') + { + if (m_sOldCorePattern == CORE_PATTERN) + { + log("warning: %s already contains %s, " + "did abrt daemon crash recently?", + CORE_PATTERN_IFACE, CORE_PATTERN); + /* There is no point in "restoring" CORE_PATTERN_IFACE + * to CORE_PATTERN on exit. Will restore to a default value: + */ + m_sOldCorePattern = "core"; + } else { + log("warning: %s was already set to run a crash analyser (%s), " + "abrt may interfere with it", + CORE_PATTERN_IFACE, CORE_PATTERN); + } + } +#ifdef HOSTILE_KERNEL + if (set_limits() != 0) + log("warning: failed to set core_size limit, ABRT won't detect crashes in" + "compiled apps"); +#endif + + fp = fopen(CORE_PATTERN_IFACE, "w"); + if (fp) + { + fputs(CORE_PATTERN, fp); + fclose(fp); + } + + /* read the core_pipe_limit and change it if it's == 0 + otherwise the abrt-hook-ccpp won't be able to read /proc/<pid> + of the crashing process + */ + fp = fopen(CORE_PIPE_LIMIT_IFACE, "r"); + if (fp) + { + /* we care only about the first char, if it's + * not '0' then we don't have to change it, + * because it means that it's already != 0 + */ + char pipe_limit[2]; + if (!fgets(pipe_limit, sizeof(pipe_limit), fp)) + pipe_limit[0] = '1'; /* not 0 */ + fclose(fp); + if (pipe_limit[0] == '0') + { + fp = fopen(CORE_PIPE_LIMIT_IFACE, "w"); + if (fp) + { + fputs(CORE_PIPE_LIMIT, fp); + fclose(fp); + } + else + { + log("warning: failed to set core_pipe_limit, ABRT won't detect" + "crashes in compiled apps if kernel > 2.6.31"); + } + } + } +} + +void CAnalyzerCCpp::DeInit() +{ + /* no need to restore the core_pipe_limit, because it's only used + when there is s pipe in core_pattern + */ + FILE *fp = fopen(CORE_PATTERN_IFACE, "w"); + if (fp) + { + fputs(m_sOldCorePattern.c_str(), fp); + fclose(fp); + } +} + +void CAnalyzerCCpp::SetSettings(const map_plugin_settings_t& pSettings) +{ + m_pSettings = pSettings; + + map_plugin_settings_t::const_iterator end = pSettings.end(); + map_plugin_settings_t::const_iterator it; + it = pSettings.find("Backtrace"); + if (it != end) + { + m_bBacktrace = string_to_bool(it->second.c_str()); + } + it = pSettings.find("BacktraceRemotes"); + if (it != end) + { + m_bBacktraceRemotes = string_to_bool(it->second.c_str()); + } + it = pSettings.find("MemoryMap"); + if (it != end) + { + m_bMemoryMap = string_to_bool(it->second.c_str()); + } + it = pSettings.find("DebugInfo"); + if (it != end) + { + m_sDebugInfo = it->second; + } + it = pSettings.find("DebugInfoCacheMB"); + if (it != end) + { + m_nDebugInfoCacheMB = xatou(it->second.c_str()); + } + it = pSettings.find("GdbTimeoutSec"); + if (it != end) + { + m_nGdbTimeoutSec = xatoi_u(it->second.c_str()); + } + it = pSettings.find("InstallDebugInfo"); + if (it == end) //compat, remove after 0.0.11 + it = pSettings.find("InstallDebuginfo"); + if (it != end) + { + m_bInstallDebugInfo = string_to_bool(it->second.c_str()); + } + m_sDebugInfoDirs = DEBUGINFO_CACHE_DIR; + it = pSettings.find("ReadonlyLocalDebugInfoDirs"); + if (it != end) + { + m_sDebugInfoDirs += ':'; + m_sDebugInfoDirs += it->second; + } +} + +//ok to delete? +//const map_plugin_settings_t& CAnalyzerCCpp::GetSettings() +//{ +// m_pSettings["MemoryMap"] = m_bMemoryMap ? "yes" : "no"; +// m_pSettings["DebugInfo"] = m_sDebugInfo; +// m_pSettings["DebugInfoCacheMB"] = to_string(m_nDebugInfoCacheMB); +// m_pSettings["InstallDebugInfo"] = m_bInstallDebugInfo ? "yes" : "no"; +// +// return m_pSettings; +//} + +PLUGIN_INFO(ANALYZER, + CAnalyzerCCpp, + "CCpp", + "0.0.1", + _("Analyzes crashes in C/C++ programs"), + "zprikryl@redhat.com", + "https://fedorahosted.org/abrt/wiki", + ""); |