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-rw-r--r--misc.cc169
1 files changed, 118 insertions, 51 deletions
diff --git a/misc.cc b/misc.cc
index b28b4a2..b69155d 100644
--- a/misc.cc
+++ b/misc.cc
@@ -56,6 +56,7 @@
#include <boost/format.hpp>
#include "iputils.hh"
#include "dnsparser.hh"
+#include "dns_random.hh"
#include <pwd.h>
#include <grp.h>
#include <climits>
@@ -432,41 +433,46 @@ int waitForMultiData(const set<int>& fds, const int seconds, const int useconds,
}
}
set<int>::const_iterator it(pollinFDs.begin());
- advance(it, random() % pollinFDs.size());
+ advance(it, dns_random(pollinFDs.size()));
*fdOut = *it;
return 1;
}
// returns -1 in case of error, 0 if no data is available, 1 if there is. In the first two cases, errno is set
-int waitFor2Data(int fd1, int fd2, int seconds, int useconds, int*fd)
+int waitFor2Data(int fd1, int fd2, int seconds, int useconds, int* fdPtr)
{
- int ret;
-
- struct pollfd pfds[2];
- memset(&pfds[0], 0, 2*sizeof(struct pollfd));
+ std::array<pollfd,2> pfds{};
+ memset(pfds.data(), 0, pfds.size() * sizeof(struct pollfd));
pfds[0].fd = fd1;
pfds[1].fd = fd2;
pfds[0].events= pfds[1].events = POLLIN;
- int nsocks = 1 + (fd2 >= 0); // fd2 can optionally be -1
+ int nsocks = 1 + static_cast<int>(fd2 >= 0); // fd2 can optionally be -1
- if(seconds >= 0)
- ret = poll(pfds, nsocks, seconds * 1000 + useconds/1000);
- else
- ret = poll(pfds, nsocks, -1);
- if(!ret || ret < 0)
+ int ret{};
+ if (seconds >= 0) {
+ ret = poll(pfds.data(), nsocks, seconds * 1000 + useconds / 1000);
+ }
+ else {
+ ret = poll(pfds.data(), nsocks, -1);
+ }
+ if (ret <= 0) {
return ret;
+ }
- if((pfds[0].revents & POLLIN) && !(pfds[1].revents & POLLIN))
- *fd = pfds[0].fd;
- else if((pfds[1].revents & POLLIN) && !(pfds[0].revents & POLLIN))
- *fd = pfds[1].fd;
+ if ((pfds[0].revents & POLLIN) != 0 && (pfds[1].revents & POLLIN) == 0) {
+ *fdPtr = pfds[0].fd;
+ }
+ else if ((pfds[1].revents & POLLIN) != 0 && (pfds[0].revents & POLLIN) == 0) {
+ *fdPtr = pfds[1].fd;
+ }
else if(ret == 2) {
- *fd = pfds[random()%2].fd;
+ *fdPtr = pfds.at(dns_random_uint32() % 2).fd;
+ }
+ else {
+ *fdPtr = -1; // should never happen
}
- else
- *fd = -1; // should never happen
return 1;
}
@@ -576,17 +582,25 @@ string bitFlip(const string &str)
void cleanSlashes(string &str)
{
- string::const_iterator i;
string out;
- for(i=str.begin();i!=str.end();++i) {
- if(*i=='/' && i!=str.begin() && *(i-1)=='/')
- continue;
- out.append(1,*i);
+ bool keepNextSlash = true;
+ for (const auto& value : str) {
+ if (value == '/') {
+ if (keepNextSlash) {
+ keepNextSlash = false;
+ }
+ else {
+ continue;
+ }
+ }
+ else {
+ keepNextSlash = true;
+ }
+ out.append(1, value);
}
- str=out;
+ str = std::move(out);
}
-
bool IpToU32(const string &str, uint32_t *ip)
{
if(str.empty()) {
@@ -847,11 +861,11 @@ bool stringfgets(FILE* fp, std::string& line)
bool readFileIfThere(const char* fname, std::string* line)
{
line->clear();
- auto fp = std::unique_ptr<FILE, int(*)(FILE*)>(fopen(fname, "r"), fclose);
- if (!fp) {
+ auto filePtr = pdns::UniqueFilePtr(fopen(fname, "r"));
+ if (!filePtr) {
return false;
}
- return stringfgets(fp.get(), *line);
+ return stringfgets(filePtr.get(), *line);
}
Regex::Regex(const string &expr)
@@ -1014,7 +1028,7 @@ bool isNonBlocking(int sock)
return flags & O_NONBLOCK;
}
-bool setReceiveSocketErrors(int sock, int af)
+bool setReceiveSocketErrors([[maybe_unused]] int sock, [[maybe_unused]] int af)
{
#ifdef __linux__
int tmp = 1, ret;
@@ -1159,7 +1173,7 @@ int getMACAddress(const ComboAddress& ca, char* dest, size_t destLen)
return foundMAC ? 0 : ENOENT;
}
#else
-int getMACAddress(const ComboAddress& ca, char* dest, size_t len)
+int getMACAddress(const ComboAddress& /* ca */, char* /* dest */, size_t /* len */)
{
return ENOENT;
}
@@ -1175,7 +1189,7 @@ string getMACAddress(const ComboAddress& ca)
return ret;
}
-uint64_t udpErrorStats(const std::string& str)
+uint64_t udpErrorStats([[maybe_unused]] const std::string& str)
{
#ifdef __linux__
ifstream ifs("/proc/net/snmp");
@@ -1217,7 +1231,7 @@ uint64_t udpErrorStats(const std::string& str)
return 0;
}
-uint64_t udp6ErrorStats(const std::string& str)
+uint64_t udp6ErrorStats([[maybe_unused]] const std::string& str)
{
#ifdef __linux__
const std::map<std::string, std::string> keys = {
@@ -1371,30 +1385,29 @@ DNSName getTSIGAlgoName(TSIGHashEnum& algoEnum)
uint64_t getOpenFileDescriptors(const std::string&)
{
#ifdef __linux__
- DIR* dirhdl=opendir(("/proc/"+std::to_string(getpid())+"/fd/").c_str());
- if(!dirhdl)
- return 0;
-
- struct dirent *entry;
- int ret=0;
- while((entry = readdir(dirhdl))) {
+ uint64_t nbFileDescriptors = 0;
+ const auto dirName = "/proc/" + std::to_string(getpid()) + "/fd/";
+ auto directoryError = pdns::visit_directory(dirName, [&nbFileDescriptors]([[maybe_unused]] ino_t inodeNumber, const std::string_view& name) {
uint32_t num;
try {
- pdns::checked_stoi_into(num, entry->d_name);
+ pdns::checked_stoi_into(num, std::string(name));
+ if (std::to_string(num) == name) {
+ nbFileDescriptors++;
+ }
} catch (...) {
- continue; // was not a number.
+ // was not a number.
}
- if(std::to_string(num) == entry->d_name)
- ret++;
+ return true;
+ });
+ if (directoryError) {
+ return 0U;
}
- closedir(dirhdl);
- return ret;
-
+ return nbFileDescriptors;
#elif defined(__OpenBSD__)
// FreeBSD also has this in libopenbsd, but I don't know if that's available always
return getdtablecount();
#else
- return 0;
+ return 0U;
#endif
}
@@ -1545,7 +1558,7 @@ bool isSettingThreadCPUAffinitySupported()
#endif
}
-int mapThreadToCPUList(pthread_t tid, const std::set<int>& cpus)
+int mapThreadToCPUList([[maybe_unused]] pthread_t tid, [[maybe_unused]] const std::set<int>& cpus)
{
#ifdef HAVE_PTHREAD_SETAFFINITY_NP
# ifdef __NetBSD__
@@ -1613,7 +1626,7 @@ std::vector<ComboAddress> getResolvers(const std::string& resolvConfPath)
return results;
}
-size_t getPipeBufferSize(int fd)
+size_t getPipeBufferSize([[maybe_unused]] int fd)
{
#ifdef F_GETPIPE_SZ
int res = fcntl(fd, F_GETPIPE_SZ);
@@ -1627,7 +1640,7 @@ size_t getPipeBufferSize(int fd)
#endif /* F_GETPIPE_SZ */
}
-bool setPipeBufferSize(int fd, size_t size)
+bool setPipeBufferSize([[maybe_unused]] int fd, [[maybe_unused]] size_t size)
{
#ifdef F_SETPIPE_SZ
if (size > static_cast<size_t>(std::numeric_limits<int>::max())) {
@@ -1735,3 +1748,57 @@ bool constantTimeStringEquals(const std::string& a, const std::string& b)
#endif /* !HAVE_SODIUM_MEMCMP */
#endif /* !HAVE_CRYPTO_MEMCMP */
}
+
+namespace pdns
+{
+struct CloseDirDeleter
+{
+ void operator()(DIR* dir) const noexcept {
+ closedir(dir);
+ }
+};
+
+std::optional<std::string> visit_directory(const std::string& directory, const std::function<bool(ino_t inodeNumber, const std::string_view& name)>& visitor)
+{
+ auto dirHandle = std::unique_ptr<DIR, CloseDirDeleter>(opendir(directory.c_str()));
+ if (!dirHandle) {
+ auto err = errno;
+ return std::string("Error opening directory '" + directory + "': " + stringerror(err));
+ }
+
+ bool keepGoing = true;
+ struct dirent* ent = nullptr;
+ // NOLINTNEXTLINE(concurrency-mt-unsafe): readdir is thread-safe nowadays and readdir_r is deprecated
+ while (keepGoing && (ent = readdir(dirHandle.get())) != nullptr) {
+ // NOLINTNEXTLINE(cppcoreguidelines-pro-bounds-array-to-pointer-decay: dirent API
+ auto name = std::string_view(ent->d_name, strlen(ent->d_name));
+ keepGoing = visitor(ent->d_ino, name);
+ }
+
+ return std::nullopt;
+}
+
+UniqueFilePtr openFileForWriting(const std::string& filePath, mode_t permissions, bool mustNotExist, bool appendIfExists)
+{
+ int flags = O_WRONLY | O_CREAT;
+ if (mustNotExist) {
+ flags |= O_EXCL;
+ }
+ else if (appendIfExists) {
+ flags |= O_APPEND;
+ }
+ int fileDesc = open(filePath.c_str(), flags, permissions);
+ if (fileDesc == -1) {
+ return {};
+ }
+ auto filePtr = pdns::UniqueFilePtr(fdopen(fileDesc, appendIfExists ? "a" : "w"));
+ if (!filePtr) {
+ auto error = errno;
+ close(fileDesc);
+ errno = error;
+ return {};
+ }
+ return filePtr;
+}
+
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-08 10:13:34 +0000