mirror of
https://github.com/RGBCube/serenity
synced 2025-07-27 19:47:34 +00:00
Add getpwent() family of functions to LibC.
Also add a little /etc/passwd database. There's just me in there.
This commit is contained in:
parent
819ce91395
commit
9886b27d9c
17 changed files with 175 additions and 25 deletions
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@ -19,6 +19,7 @@ LIBC_OBJS = \
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signal.o \
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getopt.o \
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scanf.o \
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pwd.o \
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entry.o
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OBJS = $(AK_OBJS) $(LIBC_OBJS)
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@ -9,7 +9,7 @@ ALWAYS_INLINE int isascii(int ch)
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ALWAYS_INLINE int isspace(int ch)
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{
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return ch == ' ' || ch == '\f' || ch == '\n' || ch == '\r' || ch == '\t' == '\v';
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return ch == ' ' || ch == '\f' || ch == '\n' || ch == '\r' || ch == '\t' || ch == '\v';
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}
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ALWAYS_INLINE int islower(int c)
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117
LibC/pwd.cpp
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117
LibC/pwd.cpp
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@ -0,0 +1,117 @@
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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 <unistd.h>
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#include <sys/mman.h>
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#include <AK/String.h>
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struct passwd_with_strings : public passwd {
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char name_buffer[256];
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char passwd_buffer[256];
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char gecos_buffer[256];
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char dir_buffer[256];
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char shell_buffer[256];
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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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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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} else {
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__pwdb_stream = fopen("/etc/passwd", "r");
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__pwdb_entry = (struct passwd_with_strings*)mmap(nullptr, getpagesize());
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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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}
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}
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struct passwd* getpwuid(uid_t uid)
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{
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setpwent();
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while (auto* pw = getpwent()) {
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if (pw->pw_uid == uid)
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return pw;
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}
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return nullptr;
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}
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struct passwd* getpwnam(const char* name)
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{
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setpwent();
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while (auto* pw = getpwent()) {
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if (!strcmp(pw->pw_name, name))
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return pw;
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}
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return nullptr;
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}
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struct passwd* getpwent()
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{
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if (!__pwdb_stream)
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setpwent();
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if (feof(__pwdb_stream))
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return nullptr;
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next_entry:
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char buffer[1024];
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++__pwdb_line_number;
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char* s = fgets(buffer, sizeof(buffer), __pwdb_stream);
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if (!s)
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return nullptr;
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if (feof(__pwdb_stream))
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return nullptr;
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String line(s);
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auto parts = line.split(':');
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if (parts.size() != 7) {
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fprintf(stderr, "getpwent(): Malformed entry on line %u\n", __pwdb_line_number);
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goto next_entry;
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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_uid_string = parts[2];
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auto& e_gid_string = parts[3];
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auto& e_gecos = parts[4];
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auto& e_dir = parts[5];
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auto& e_shell = parts[6];
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bool ok;
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uid_t e_uid = e_uid_string.toUInt(ok);
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if (!ok) {
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fprintf(stderr, "getpwent(): Malformed UID on line %u\n", __pwdb_line_number);
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goto next_entry;
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}
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gid_t e_gid = e_gid_string.toUInt(ok);
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if (!ok) {
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fprintf(stderr, "getpwent(): Malformed GID on line %u\n", __pwdb_line_number);
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goto next_entry;
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}
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__pwdb_entry->pw_uid = e_uid;
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__pwdb_entry->pw_gid = e_gid;
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__pwdb_entry->pw_name = __pwdb_entry->name_buffer;
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__pwdb_entry->pw_passwd = __pwdb_entry->passwd_buffer;
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__pwdb_entry->pw_gecos = __pwdb_entry->gecos_buffer;
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__pwdb_entry->pw_dir = __pwdb_entry->dir_buffer;
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__pwdb_entry->pw_shell = __pwdb_entry->shell_buffer;
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strncpy(__pwdb_entry->name_buffer, e_name.characters(), e_name.length());
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strncpy(__pwdb_entry->passwd_buffer, e_passwd.characters(), e_passwd.length());
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strncpy(__pwdb_entry->gecos_buffer, e_gecos.characters(), e_gecos.length());
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strncpy(__pwdb_entry->dir_buffer, e_dir.characters(), e_dir.length());
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strncpy(__pwdb_entry->shell_buffer, e_shell.characters(), e_shell.length());
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return __pwdb_entry;
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}
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24
LibC/pwd.h
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24
LibC/pwd.h
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@ -0,0 +1,24 @@
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#pragma once
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#include <sys/cdefs.h>
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#include <sys/types.h>
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__BEGIN_DECLS
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struct passwd {
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char* pw_name;
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char* pw_passwd;
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uid_t pw_uid;
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gid_t pw_gid;
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char* pw_gecos;
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char* pw_dir;
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char* pw_shell;
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};
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struct passwd* getpwent();
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void setpwent();
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void endpwent();
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struct passwd* getpwnam(const char* name);
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struct passwd* getpwuid(uid_t);
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__END_DECLS
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@ -42,7 +42,7 @@ char* fgets(char* buffer, int size, FILE* stream)
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int fgetc(FILE* stream)
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{
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char ch;
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read(stream->fd, &ch, 1);
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fread(&ch, sizeof(char), 1, stream);
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return ch;
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}
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@ -31,6 +31,9 @@ int getc(FILE*);
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int getchar();
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FILE* fopen(const char* pathname, const char* mode);
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int fclose(FILE*);
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void rewind(FILE*);
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void clearerr(FILE*);
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int feof(FILE*);
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size_t fread(void* ptr, size_t size, size_t nmemb, FILE*);
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size_t fwrite(const void* ptr, size_t size, size_t nmemb, FILE*);
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int fprintf(FILE*, const char* fmt, ...);
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@ -9,4 +9,3 @@
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#define __BEGIN_DECLS
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#define __END_DECLS
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#endif
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1
LibC/sys/mman.h
Normal file
1
LibC/sys/mman.h
Normal file
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#include <mman.h>
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@ -7,6 +7,7 @@ __BEGIN_DECLS
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extern char** environ;
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inline int getpagesize() { return 4096; }
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uid_t getuid();
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gid_t getgid();
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pid_t getpid();
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