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Fix uprobe deployment failure with two similar probes #2

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Fix uprobe deployment failure with two similar probes #2

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3ba8246
wip
chengruizhe Jul 12, 2022
5c21d4a
wip
chengruizhe Jul 12, 2022
2a1529b
wip
chengruizhe Jul 12, 2022
5c19781
Remove random_alnum_string
chengruizhe Jul 12, 2022
66e181a
Use hex string of hash
chengruizhe Jul 13, 2022
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21 changes: 6 additions & 15 deletions src/cc/api/BPF.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -856,27 +856,18 @@ bool BPF::add_module(std::string module)

namespace {

std::string random_alnum_string(int len) {
static constexpr char kDict[] = "0123456789abcdefghijklmnopqrstuvwxyz";
static std::random_device rd;
std::uniform_int_distribution<size_t> dist(0, sizeof(kDict)-1);
std::string res;
res.reserve(len);
for (int i = 0; i < len; ++i) {
res.push_back(kDict[dist(rd)]);
}
return res;
}

constexpr size_t kEventNameSizeLimit = 224;

std::string shorten_event_name(const std::string& name) {
constexpr size_t kRandomSuffixLen = 16;
constexpr size_t kHashSuffixLen = 16;
std::string res;
size_t hash = std::hash<std::string>{}(name);
res.reserve(kEventNameSizeLimit);
res.assign(name);
res.resize(kEventNameSizeLimit - kRandomSuffixLen);
res.append(random_alnum_string(kRandomSuffixLen));
res.resize(kEventNameSizeLimit - kHashSuffixLen);
std::stringstream stream;
stream << std::hex << hash;
res.append(stream.str());
return res;
}

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