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ircd::mods::ldso: Add a strtab lookup tool.

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This commit is contained in:
Jason Volk 2019-06-02 20:38:00 -07:00
parent b4e44a0ce1
commit 29cdca5fbe
3 changed files with 32 additions and 0 deletions
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1
configure.ac
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@ -762,6 +762,7 @@ RB_CHK_SYSHEADER(unistd.h, [UNISTD_H])
RB_CHK_SYSHEADER(signal.h, [SIGNAL_H])
RB_CHK_SYSHEADER(ifaddrs.h, [IFADDRS_H])
RB_CHK_SYSHEADER(fcntl.h, [FCNTL_H])
RB_CHK_SYSHEADER(elf.h, [ELF_H])
RB_CHK_SYSHEADER(link.h, [LINK_H])
RB_CHK_SYSHEADER(dlfcn.h, [DLFCN_H])
RB_CHK_SYSHEADER(sys/types.h, [SYS_TYPES_H])

6
include/ircd/mods/ldso.h
View file

@ -30,6 +30,7 @@ namespace ircd::mods::ldso
using link_closure = std::function<bool (struct link_map &)>;
using semantic_version = std::array<long, 3>;
// Util
string_view fullname(const struct link_map &); // /lib/x86_64-linux-gnu/libz.so.1
string_view soname(const string_view &fullname); // libz.so.1
string_view soname(const struct link_map &); // libz.so.1
@ -38,12 +39,17 @@ namespace ircd::mods::ldso
semantic_version version(const string_view &soname); // 1.0.0
semantic_version version(const struct link_map &map); // 1.0.0
// Iteration
bool for_each(const link_closure &);
bool has_fullname(const string_view &path);
bool has_soname(const string_view &name);
bool has(const string_view &name);
size_t count();
// Get link
struct link_map *get(std::nothrow_t, const string_view &name);
struct link_map &get(const string_view &name);
// Query link
string_view string(const struct link_map &, const size_t &idx);
}

25
ircd/mods_ldso.cc
View file

@ -12,6 +12,7 @@
// in libircd glibc+ELF supporting environments. Do not rely on these
// definitions being available on all platforms.
#include <RB_INC_ELF_H
#include <RB_INC_DLFCN_H
#include <RB_INC_LINK_H
@ -20,6 +21,30 @@
// mods/ldso.h
//
ircd::string_view
ircd::mods::ldso::string(const struct link_map &map,
const size_t &idx)
{
const char *str {nullptr};
for(auto d(map.l_ld); d->d_tag != DT_NULL; ++d)
if(d->d_tag == DT_STRTAB)
{
str = reinterpret_cast<const char *>(d->d_un.d_ptr);
break;
}
if(!str)
return {};
size_t i(1);
for(++str; *str && i < idx; str += strlen(str) + 1)
++i;
return i == idx?
string_view{str}:
string_view{};
}
struct link_map &
ircd::mods::ldso::get(const string_view &name)
{