mirror of
https://github.com/LadybirdBrowser/ladybird.git
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LibC: Use AK::String-backed buffers instead of static buffers
Also, refactor the hell out of pwd.cpp & grp.cpp
This commit is contained in:
Sergey Bugaev
Andreas Kling
parent
5fd88e51c5
commit
17109a3a31
Notes:
sideshowbarker
2024-07-19 02:59:46 +09:00
Author: https://github.com/bugaevc Commit: https://github.com/SerenityOS/serenity/commit/17109a3a316 Pull-request: https://github.com/SerenityOS/serenity/pull/3296 Reviewed-by: https://github.com/BenWiederhake Reviewed-by: https://github.com/alimpfard
@ -26,54 +26,51 @@
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#include <AK/String.h>
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#include <AK/Vector.h>
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#include <errno_numbers.h>
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#include <grp.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <unistd.h>
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extern "C" {
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#define GRDB_STR_MAX_LEN 256
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static FILE* s_stream = nullptr;
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static unsigned s_line_number = 0;
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static struct group s_group;
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struct group_with_strings : public group {
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char name_buffer[GRDB_STR_MAX_LEN];
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char passwd_buffer[GRDB_STR_MAX_LEN];
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char* members[32];
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char members_buffer[32][32];
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};
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static FILE* __grdb_stream = nullptr;
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static unsigned __grdb_line_number = 0;
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static struct group_with_strings* __grdb_entry = nullptr;
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static String s_name;
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static String s_passwd;
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static Vector<String> s_members;
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static Vector<const char*> s_members_ptrs;
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void setgrent()
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{
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__grdb_line_number = 0;
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if (__grdb_stream) {
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rewind(__grdb_stream);
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s_line_number = 0;
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if (s_stream) {
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rewind(s_stream);
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} else {
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__grdb_stream = fopen("/etc/group", "r");
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if (!__grdb_stream) {
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s_stream = fopen("/etc/group", "r");
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if (!s_stream) {
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perror("open /etc/group");
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}
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assert(__grdb_stream);
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__grdb_entry = (struct group_with_strings*)mmap_with_name(nullptr, getpagesize(), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0, "setgrent");
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}
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}
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void endgrent()
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{
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__grdb_line_number = 0;
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if (__grdb_stream) {
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fclose(__grdb_stream);
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__grdb_stream = nullptr;
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}
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if (__grdb_entry) {
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munmap(__grdb_entry, getpagesize());
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__grdb_entry = nullptr;
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s_line_number = 0;
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if (s_stream) {
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fclose(s_stream);
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s_stream = nullptr;
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}
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memset(&s_group, 0, sizeof(s_group));
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s_name = {};
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s_passwd = {};
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s_members = {};
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s_members_ptrs = {};
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}
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struct group* getgrgid(gid_t gid)
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@ -96,52 +93,69 @@ struct group* getgrnam(const char* name)
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return nullptr;
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}
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static bool parse_grpdb_entry(const String& line)
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{
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auto parts = line.split_view(':', true);
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if (parts.size() != 4) {
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fprintf(stderr, "getgrent(): Malformed entry on line %u: '%s' has %zu parts\n", s_line_number, line.characters(), parts.size());
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return false;
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}
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s_name = parts[0];
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s_passwd = parts[1];
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auto& gid_string = parts[2];
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String members_string = parts[3];
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auto gid = gid_string.to_uint();
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if (!gid.has_value()) {
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fprintf(stderr, "getgrent(): Malformed GID on line %u\n", s_line_number);
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return false;
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}
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s_members = members_string.split(',');
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s_members_ptrs.clear_with_capacity();
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s_members_ptrs.ensure_capacity(s_members.size() + 1);
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for (auto& member : s_members) {
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s_members_ptrs.append(member.characters());
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}
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s_members_ptrs.append(nullptr);
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s_group.gr_gid = gid.value();
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s_group.gr_name = const_cast<char*>(s_name.characters());
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s_group.gr_passwd = const_cast<char*>(s_passwd.characters());
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s_group.gr_mem = const_cast<char**>(s_members_ptrs.data());
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return true;
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}
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struct group* getgrent()
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{
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if (!__grdb_stream)
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if (!s_stream)
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setgrent();
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assert(__grdb_stream);
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if (feof(__grdb_stream))
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return nullptr;
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while (true) {
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if (!s_stream || feof(s_stream))
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return nullptr;
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next_entry:
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char buffer[1024];
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++__grdb_line_number;
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char* s = fgets(buffer, sizeof(buffer), __grdb_stream);
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if (!s)
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return nullptr;
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assert(__grdb_stream);
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if (feof(__grdb_stream))
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return nullptr;
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String line(s, Chomp);
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auto parts = line.split(':', true);
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if (parts.size() != 4) {
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fprintf(stderr, "getgrent(): Malformed entry on line %u: '%s' has %zu parts\n", __grdb_line_number, line.characters(), parts.size());
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goto next_entry;
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if (ferror(s_stream)) {
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fprintf(stderr, "getgrent(): Read error: %s\n", strerror(ferror(s_stream)));
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return nullptr;
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}
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char buffer[1024];
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++s_line_number;
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char* s = fgets(buffer, sizeof(buffer), s_stream);
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// Silently tolerate an empty line at the end.
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if ((!s || !s[0]) && feof(s_stream))
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return nullptr;
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String line(s, Chomp);
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if (parse_grpdb_entry(line))
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return &s_group;
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// Otherwise, proceed to the next line.
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}
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auto& e_name = parts[0];
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auto& e_passwd = parts[1];
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auto& e_gid_string = parts[2];
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auto& e_members_string = parts[3];
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auto e_gid = e_gid_string.to_uint();
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if (!e_gid.has_value()) {
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fprintf(stderr, "getgrent(): Malformed GID on line %u\n", __grdb_line_number);
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goto next_entry;
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}
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auto members = e_members_string.split(',');
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__grdb_entry->gr_gid = e_gid.value();
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__grdb_entry->gr_name = __grdb_entry->name_buffer;
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__grdb_entry->gr_passwd = __grdb_entry->passwd_buffer;
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for (size_t i = 0; i < members.size(); ++i) {
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__grdb_entry->members[i] = __grdb_entry->members_buffer[i];
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strlcpy(__grdb_entry->members_buffer[i], members[i].characters(), sizeof(__grdb_entry->members_buffer[i]));
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}
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__grdb_entry->members[members.size()] = nullptr;
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__grdb_entry->gr_mem = __grdb_entry->members;
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strlcpy(__grdb_entry->name_buffer, e_name.characters(), GRDB_STR_MAX_LEN);
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strlcpy(__grdb_entry->passwd_buffer, e_passwd.characters(), GRDB_STR_MAX_LEN);
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return __grdb_entry;
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}
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int initgroups(const char* user, gid_t extra_gid)
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@ -41,12 +41,10 @@ extern "C" {
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int h_errno;
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static hostent __gethostbyname_buffer;
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static char __gethostbyname_name_buffer[512];
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static in_addr_t __gethostbyname_address;
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static in_addr_t* __gethostbyname_address_list_buffer[2];
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static hostent __gethostbyaddr_buffer;
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static char __gethostbyaddr_name_buffer[512];
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static in_addr_t* __gethostbyaddr_address_list_buffer[2];
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//Get service entry buffers and file information for the getservent() family of functions
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@ -55,8 +53,8 @@ static const char* services_path = "/etc/services";
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static bool fill_getserv_buffers(char* line, ssize_t read);
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static servent __getserv_buffer;
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static char __getserv_name_buffer[512];
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static char __getserv_protocol_buffer[10];
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static String __getserv_name_buffer;
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static String __getserv_protocol_buffer;
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static int __getserv_port_buffer;
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static Vector<ByteBuffer> __getserv_alias_list_buffer;
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static Vector<char*> __getserv_alias_list;
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@ -69,7 +67,7 @@ static const char* protocols_path = "/etc/protocols";
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static bool fill_getproto_buffers(char* line, ssize_t read);
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static protoent __getproto_buffer;
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static char __getproto_name_buffer[512];
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static String __getproto_name_buffer;
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static Vector<ByteBuffer> __getproto_alias_list_buffer;
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static Vector<char*> __getproto_alias_list;
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static int __getproto_protocol_buffer;
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@ -98,12 +96,13 @@ static int connect_to_lookup_server()
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hostent* gethostbyname(const char* name)
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{
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static String s_name_buffer;
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auto ipv4_address = IPv4Address::from_string(name);
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if (ipv4_address.has_value()) {
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auto ip4_string = ipv4_address.value().to_string();
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ASSERT(ip4_string.length() < sizeof(__gethostbyname_name_buffer));
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strlcpy(__gethostbyname_name_buffer, ip4_string.characters(), sizeof(__gethostbyname_name_buffer));
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__gethostbyname_buffer.h_name = __gethostbyname_name_buffer;
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s_name_buffer = ipv4_address.value().to_string();
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__gethostbyname_buffer.h_name = const_cast<char*>(s_name_buffer.characters());
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__gethostbyname_buffer.h_aliases = nullptr;
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__gethostbyname_buffer.h_addrtype = AF_INET;
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new (&__gethostbyname_address) IPv4Address(ipv4_address.value());
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@ -152,9 +151,8 @@ hostent* gethostbyname(const char* name)
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if (rc <= 0)
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return nullptr;
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strlcpy(__gethostbyname_name_buffer, name, sizeof(__gethostbyaddr_name_buffer));
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__gethostbyname_buffer.h_name = __gethostbyname_name_buffer;
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s_name_buffer = name;
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__gethostbyname_buffer.h_name = const_cast<char*>(s_name_buffer.characters());
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__gethostbyname_buffer.h_aliases = nullptr;
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__gethostbyname_buffer.h_addrtype = AF_INET;
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__gethostbyname_address_list_buffer[0] = &__gethostbyname_address;
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@ -167,6 +165,8 @@ hostent* gethostbyname(const char* name)
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hostent* gethostbyaddr(const void* addr, socklen_t addr_size, int type)
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{
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static String s_name_buffer;
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if (type != AF_INET) {
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errno = EAFNOSUPPORT;
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return nullptr;
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@ -214,11 +214,8 @@ hostent* gethostbyaddr(const void* addr, socklen_t addr_size, int type)
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if (responses.is_empty())
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return nullptr;
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auto& response = responses[0];
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strlcpy(__gethostbyaddr_name_buffer, response.characters(), sizeof(__gethostbyaddr_name_buffer));
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__gethostbyaddr_buffer.h_name = __gethostbyaddr_name_buffer;
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s_name_buffer = responses[0];
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__gethostbyaddr_buffer.h_name = const_cast<char*>(s_name_buffer.characters());
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__gethostbyaddr_buffer.h_aliases = nullptr;
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__gethostbyaddr_buffer.h_addrtype = AF_INET;
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// FIXME: Should we populate the hostent's address list here with a sockaddr_in for the provided host?
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@ -275,9 +272,9 @@ struct servent* getservent()
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if (!fill_getserv_buffers(line, read))
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return nullptr;
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__getserv_buffer.s_name = __getserv_name_buffer;
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__getserv_buffer.s_name = const_cast<char*>(__getserv_name_buffer.characters());
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__getserv_buffer.s_port = __getserv_port_buffer;
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__getserv_buffer.s_proto = __getserv_protocol_buffer;
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__getserv_buffer.s_proto = const_cast<char*>(__getserv_protocol_buffer.characters());
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__getserv_alias_list.clear();
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for (auto& alias : __getserv_alias_list_buffer) {
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@ -373,12 +370,7 @@ static bool fill_getserv_buffers(char* line, ssize_t read)
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perror("malformed services file: entry");
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return false;
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}
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if (sizeof(__getserv_name_buffer) >= split_line[0].length() + 1) {
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strlcpy(__getserv_name_buffer, split_line[0].characters(), sizeof(__getserv_name_buffer));
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} else {
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perror("invalid buffer length: service name");
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return false;
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}
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__getserv_name_buffer = split_line[0];
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auto port_protocol_split = String(split_line[1]).split('/');
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if (port_protocol_split.size() < 2) {
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@ -396,13 +388,7 @@ static bool fill_getserv_buffers(char* line, ssize_t read)
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port_protocol_split[1].replace("\t", "", true);
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port_protocol_split[1].replace("\n", "", true);
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if (sizeof(__getserv_protocol_buffer) >= port_protocol_split[1].length()) {
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strlcpy(__getserv_protocol_buffer, port_protocol_split[1].characters(), sizeof(__getserv_protocol_buffer));
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} else {
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perror("malformed services file: protocol");
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return false;
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}
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__getserv_protocol_buffer = port_protocol_split[1];
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__getserv_alias_list_buffer.clear();
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//If there are aliases for the service, we will fill the alias list buffer.
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@ -468,7 +454,7 @@ struct protoent* getprotoent()
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if (!fill_getproto_buffers(line, read))
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return nullptr;
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__getproto_buffer.p_name = __getproto_name_buffer;
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__getproto_buffer.p_name = const_cast<char*>(__getproto_name_buffer.characters());
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__getproto_buffer.p_proto = __getproto_protocol_buffer;
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__getproto_alias_list.clear();
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@ -565,12 +551,7 @@ static bool fill_getproto_buffers(char* line, ssize_t read)
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perror("malformed protocols file: entry");
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return false;
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}
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if (sizeof(__getproto_name_buffer) >= split_line[0].length() + 1) {
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strlcpy(__getproto_name_buffer, split_line[0].characters(), sizeof(__getproto_name_buffer));
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} else {
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perror("invalid buffer length: protocol name");
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return false;
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}
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__getproto_name_buffer = split_line[0];
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auto number = split_line[1].to_int();
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if (!number.has_value())
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@ -26,55 +26,53 @@
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#include <AK/String.h>
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#include <AK/Vector.h>
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#include <errno_numbers.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <unistd.h>
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extern "C" {
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#define PWDB_STR_MAX_LEN 256
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static FILE* s_stream = nullptr;
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static unsigned s_line_number = 0;
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static struct passwd s_passwd_entry;
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struct passwd_with_strings : public passwd {
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char name_buffer[PWDB_STR_MAX_LEN];
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char passwd_buffer[PWDB_STR_MAX_LEN];
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char gecos_buffer[PWDB_STR_MAX_LEN];
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char dir_buffer[PWDB_STR_MAX_LEN];
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char shell_buffer[PWDB_STR_MAX_LEN];
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};
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static FILE* __pwdb_stream = nullptr;
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static unsigned __pwdb_line_number = 0;
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static struct passwd_with_strings* __pwdb_entry = nullptr;
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static String s_name;
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static String s_passwd;
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static String s_gecos;
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static String s_dir;
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static String s_shell;
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void setpwent()
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{
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__pwdb_line_number = 0;
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if (__pwdb_stream) {
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rewind(__pwdb_stream);
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s_line_number = 0;
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if (s_stream) {
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rewind(s_stream);
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} else {
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__pwdb_stream = fopen("/etc/passwd", "r");
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if (!__pwdb_stream) {
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s_stream = fopen("/etc/passwd", "r");
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if (!s_stream) {
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perror("open /etc/passwd");
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}
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assert(__pwdb_stream);
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__pwdb_entry = (struct passwd_with_strings*)mmap_with_name(nullptr, getpagesize(), PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0, "setpwent");
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}
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}
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void endpwent()
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{
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__pwdb_line_number = 0;
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if (__pwdb_stream) {
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fclose(__pwdb_stream);
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__pwdb_stream = nullptr;
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}
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if (__pwdb_entry) {
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munmap(__pwdb_entry, getpagesize());
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__pwdb_entry = nullptr;
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s_line_number = 0;
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if (s_stream) {
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fclose(s_stream);
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s_stream = nullptr;
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}
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memset(&s_passwd_entry, 0, sizeof(s_passwd_entry));
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s_name = {};
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s_passwd = {};
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s_gecos = {};
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s_dir = {};
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s_shell = {};
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}
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struct passwd* getpwuid(uid_t uid)
|
||||
@ -97,61 +95,71 @@ struct passwd* getpwnam(const char* name)
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
static bool parse_pwddb_entry(const String& line)
|
||||
{
|
||||
auto parts = line.split_view(':', true);
|
||||
if (parts.size() != 7) {
|
||||
fprintf(stderr, "getpwent(): Malformed entry on line %u\n", s_line_number);
|
||||
return false;
|
||||
}
|
||||
|
||||
s_name = parts[0];
|
||||
s_passwd = parts[1];
|
||||
auto& uid_string = parts[2];
|
||||
auto& gid_string = parts[3];
|
||||
s_gecos = parts[4];
|
||||
s_dir = parts[5];
|
||||
s_shell = parts[6];
|
||||
|
||||
auto uid = uid_string.to_uint();
|
||||
if (!uid.has_value()) {
|
||||
fprintf(stderr, "getpwent(): Malformed UID on line %u\n", s_line_number);
|
||||
return false;
|
||||
}
|
||||
auto gid = gid_string.to_uint();
|
||||
if (!gid.has_value()) {
|
||||
fprintf(stderr, "getpwent(): Malformed GID on line %u\n", s_line_number);
|
||||
return false;
|
||||
}
|
||||
|
||||
s_passwd_entry.pw_name = const_cast<char*>(s_name.characters());
|
||||
s_passwd_entry.pw_passwd = const_cast<char*>(s_passwd.characters());
|
||||
s_passwd_entry.pw_uid = uid.value();
|
||||
s_passwd_entry.pw_gid = gid.value();
|
||||
s_passwd_entry.pw_gecos = const_cast<char*>(s_gecos.characters());
|
||||
s_passwd_entry.pw_dir = const_cast<char*>(s_dir.characters());
|
||||
s_passwd_entry.pw_shell = const_cast<char*>(s_shell.characters());
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
struct passwd* getpwent()
|
||||
{
|
||||
if (!__pwdb_stream)
|
||||
if (!s_stream)
|
||||
setpwent();
|
||||
|
||||
assert(__pwdb_stream);
|
||||
if (feof(__pwdb_stream))
|
||||
return nullptr;
|
||||
while (true) {
|
||||
if (!s_stream || feof(s_stream))
|
||||
return nullptr;
|
||||
|
||||
next_entry:
|
||||
char buffer[1024];
|
||||
++__pwdb_line_number;
|
||||
char* s = fgets(buffer, sizeof(buffer), __pwdb_stream);
|
||||
if (!s)
|
||||
return nullptr;
|
||||
assert(__pwdb_stream);
|
||||
if (feof(__pwdb_stream))
|
||||
return nullptr;
|
||||
String line(s, Chomp);
|
||||
auto parts = line.split(':', true);
|
||||
if (parts.size() != 7) {
|
||||
fprintf(stderr, "getpwent(): Malformed entry on line %u\n", __pwdb_line_number);
|
||||
goto next_entry;
|
||||
}
|
||||
auto& e_name = parts[0];
|
||||
auto& e_passwd = parts[1];
|
||||
auto& e_uid_string = parts[2];
|
||||
auto& e_gid_string = parts[3];
|
||||
auto& e_gecos = parts[4];
|
||||
auto& e_dir = parts[5];
|
||||
auto& e_shell = parts[6];
|
||||
auto e_uid = e_uid_string.to_uint();
|
||||
if (!e_uid.has_value()) {
|
||||
fprintf(stderr, "getpwent(): Malformed UID on line %u\n", __pwdb_line_number);
|
||||
goto next_entry;
|
||||
}
|
||||
auto e_gid = e_gid_string.to_uint();
|
||||
if (!e_gid.has_value()) {
|
||||
fprintf(stderr, "getpwent(): Malformed GID on line %u\n", __pwdb_line_number);
|
||||
goto next_entry;
|
||||
}
|
||||
__pwdb_entry->pw_uid = e_uid.value();
|
||||
__pwdb_entry->pw_gid = e_gid.value();
|
||||
__pwdb_entry->pw_name = __pwdb_entry->name_buffer;
|
||||
__pwdb_entry->pw_passwd = __pwdb_entry->passwd_buffer;
|
||||
__pwdb_entry->pw_gecos = __pwdb_entry->gecos_buffer;
|
||||
__pwdb_entry->pw_dir = __pwdb_entry->dir_buffer;
|
||||
__pwdb_entry->pw_shell = __pwdb_entry->shell_buffer;
|
||||
if (ferror(s_stream)) {
|
||||
fprintf(stderr, "getpwent(): Read error: %s\n", strerror(ferror(s_stream)));
|
||||
return nullptr;
|
||||
}
|
||||
|
||||
strlcpy(__pwdb_entry->name_buffer, e_name.characters(), PWDB_STR_MAX_LEN);
|
||||
strlcpy(__pwdb_entry->passwd_buffer, e_passwd.characters(), PWDB_STR_MAX_LEN);
|
||||
strlcpy(__pwdb_entry->gecos_buffer, e_gecos.characters(), PWDB_STR_MAX_LEN);
|
||||
strlcpy(__pwdb_entry->dir_buffer, e_dir.characters(), PWDB_STR_MAX_LEN);
|
||||
strlcpy(__pwdb_entry->shell_buffer, e_shell.characters(), PWDB_STR_MAX_LEN);
|
||||
return __pwdb_entry;
|
||||
char buffer[1024];
|
||||
++s_line_number;
|
||||
char* s = fgets(buffer, sizeof(buffer), s_stream);
|
||||
|
||||
// Silently tolerate an empty line at the end.
|
||||
if ((!s || !s[0]) && feof(s_stream))
|
||||
return nullptr;
|
||||
|
||||
String line(s, Chomp);
|
||||
if (parse_pwddb_entry(line))
|
||||
return &s_passwd_entry;
|
||||
// Otherwise, proceed to the next line.
|
||||
}
|
||||
}
|
||||
|
||||
int putpwent(const struct passwd* p, FILE* stream)
|
||||
|
||||
@ -557,14 +557,14 @@ int set_process_icon(int icon_id)
|
||||
|
||||
char* getlogin()
|
||||
{
|
||||
static char __getlogin_buffer[256];
|
||||
if (auto* passwd = getpwuid(getuid())) {
|
||||
strlcpy(__getlogin_buffer, passwd->pw_name, sizeof(__getlogin_buffer));
|
||||
static String buffer;
|
||||
if (buffer.is_null()) {
|
||||
if (auto* passwd = getpwuid(getuid())) {
|
||||
buffer = String(passwd->pw_name);
|
||||
}
|
||||
endpwent();
|
||||
return __getlogin_buffer;
|
||||
}
|
||||
endpwent();
|
||||
return nullptr;
|
||||
return const_cast<char*>(buffer.characters());
|
||||
}
|
||||
|
||||
int ftruncate(int fd, off_t length)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user