summaryrefslogtreecommitdiff
path: root/lib/mlibc/options/posix/generic/grp-stubs.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'lib/mlibc/options/posix/generic/grp-stubs.cpp')
-rw-r--r--lib/mlibc/options/posix/generic/grp-stubs.cpp316
1 files changed, 0 insertions, 316 deletions
diff --git a/lib/mlibc/options/posix/generic/grp-stubs.cpp b/lib/mlibc/options/posix/generic/grp-stubs.cpp
deleted file mode 100644
index f8b2813..0000000
--- a/lib/mlibc/options/posix/generic/grp-stubs.cpp
+++ /dev/null
@@ -1,316 +0,0 @@
-
-#include <grp.h>
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <bits/ensure.h>
-
-#include <mlibc/debug.hpp>
-#include <mlibc/posix-sysdeps.hpp>
-
-namespace {
- FILE *global_file;
-
- bool open_global_file() {
- if(!global_file) {
- global_file = fopen("/etc/group", "r");
- if(!global_file) {
- errno = EIO;
- return false;
- }
- }
-
- return true;
- }
-
- void close_global_file() {
- if(global_file) {
- fclose(global_file);
- global_file = nullptr;
- }
- }
-
- template<typename F>
- void walk_segments(frg::string_view line, char delimiter, F fn) {
- size_t s = 0;
- while(true) {
- size_t d = line.find_first(delimiter, s);
- if(d == size_t(-1))
- break;
- auto chunk = line.sub_string(s, d - s);
- fn(chunk);
- s = d + 1;
- }
- if(line[s]) {
- auto chunk = line.sub_string(s, line.size() - s);
-
- if (chunk.size() > 0) {
- // Remove trailing newline
- if (chunk[chunk.size() - 1] == '\n')
- chunk = chunk.sub_string(0, chunk.size() - 1);
-
- fn(chunk);
- }
- }
- }
-
- bool extract_entry(frg::string_view line, group *entry) {
- frg::string_view segments[5];
-
- // Parse the line into 3 or 4 segments (depending if the group has members or not)
- int n = 0;
- walk_segments(line, ':', [&] (frg::string_view s) {
- __ensure(n < 4);
- segments[n++] = s;
- });
-
- if(n < 3) // n can be 3 when there are no members in the group
- return false;
-
- // TODO: Handle strndup() and malloc() failure.
- auto name = strndup(segments[0].data(), segments[0].size());
- __ensure(name);
-
- auto passwd = strndup(segments[1].data(), segments[1].size());
-
- auto gid = segments[2].to_number<int>();
- if(!gid)
- return false;
-
- size_t n_members = 0;
- walk_segments(segments[3], ',', [&] (frg::string_view) {
- n_members++;
- });
-
- auto members = reinterpret_cast<char **>(malloc(sizeof(char *) * (n_members + 1)));
- __ensure(members);
- size_t k = 0;
- walk_segments(segments[3], ',', [&] (frg::string_view m) {
- members[k] = strndup(m.data(), m.size());
- __ensure(members[k]);
- k++;
- });
- members[k] = nullptr;
-
- entry->gr_name = name;
- entry->gr_passwd = passwd;
- entry->gr_gid = *gid;
- entry->gr_mem = members;
- return true;
- }
-
- void clear_entry(group *entry) {
- free(entry->gr_name);
- if(entry->gr_mem) {
- for(size_t i = 0; entry->gr_mem[i]; i++)
- free(entry->gr_mem[i]);
- free(entry->gr_mem);
- }
- entry->gr_name = nullptr;
- entry->gr_mem = nullptr;
- }
-
- template<typename C>
- int walk_file(struct group *entry, C cond) {
- auto file = fopen("/etc/group", "r");
- if(!file) {
- return EIO;
- }
-
- char line[512];
- while(fgets(line, 512, file)) {
- if(!extract_entry(line, entry))
- continue;
- if(cond(entry)) {
- fclose(file);
- return 0;
- }
- }
-
- int err = ESRCH;
- if(ferror(file)) {
- err = EIO;
- }
-
- fclose(file);
- return err;
- }
-
- int copy_to_buffer(struct group *grp, char *buffer, size_t size) {
- // Adjust to correct alignment so that we can put gr_mem first in buffer
- uintptr_t mask = sizeof(char *) - 1;
- size_t offset = (reinterpret_cast<uintptr_t>(buffer) % sizeof(char *) + mask) & ~mask;
- if (size < offset)
- return ERANGE;
-
- buffer += offset;
- size -= offset;
-
- // Calculate the amount of space we need
- size_t nmemb, required_size = 0;
- for (nmemb = 0; grp->gr_mem[nmemb] != nullptr; nmemb++) {
- // One for the string's null terminator and one for the pointer in gr_mem
- required_size += strlen(grp->gr_mem[nmemb]) + 1 + sizeof(char *);
- }
-
- // One for null terminator of gr_name, plus sizeof(char *) for nullptr terminator of gr_mem
- required_size += strlen(grp->gr_name) + 1 + sizeof(char *);
- if (size < required_size)
- return ERANGE;
-
- // Put the gr_mem array first in the buffer as we are guaranteed
- // that the pointer is aligned correctly
- char *string_data = buffer + (nmemb + 1) * sizeof(char *);
-
- for (size_t i = 0; i < nmemb; i++) {
- reinterpret_cast<char **>(buffer)[i] = string_data;
- string_data = stpcpy(string_data, grp->gr_mem[i]) + 1;
- free(grp->gr_mem[i]);
- }
-
- reinterpret_cast<char **>(buffer)[nmemb] = nullptr;
- free(grp->gr_mem);
- grp->gr_mem = reinterpret_cast<char **>(buffer);
-
- char *gr_name = stpcpy(string_data, grp->gr_name) + 1;
- free(grp->gr_name);
- grp->gr_name = string_data;
-
- __ensure(gr_name <= buffer + size);
- return 0;
- }
-}
-
-void endgrent(void) {
- close_global_file();
-}
-
-struct group *getgrent(void) {
- static group entry;
- char line[512];
-
- if(!open_global_file()) {
- return nullptr;
- }
-
- if(fgets(line, 512, global_file)) {
- clear_entry(&entry);
- if(!extract_entry(line, &entry)) {
- errno = EINVAL;
- return nullptr;
- }
- return &entry;
- }
-
- if(ferror(global_file)) {
- errno = EIO;
- }
-
- return nullptr;
-}
-
-struct group *getgrgid(gid_t gid) {
- static group entry;
-
- int err = walk_file(&entry, [&] (group *entry) {
- return entry->gr_gid == gid;
- });
-
- if (err) {
- errno = err;
- return nullptr;
- }
-
- return &entry;
-}
-
-int getgrgid_r(gid_t gid, struct group *grp, char *buffer, size_t size, struct group **result) {
- *result = nullptr;
- int err = walk_file(grp, [&] (group *entry) {
- return entry->gr_gid == gid;
- });
-
- if (err) {
- return err;
- }
-
- err = copy_to_buffer(grp, buffer, size);
- if (err) {
- return err;
- }
-
- *result = grp;
- return 0;
-}
-
-struct group *getgrnam(const char *name) {
- static group entry;
-
- int err = walk_file(&entry, [&] (group *entry) {
- return !strcmp(entry->gr_name, name);
- });
-
- if (err) {
- errno = err;
- return nullptr;
- }
-
- return &entry;
-}
-
-int getgrnam_r(const char *name, struct group *grp, char *buffer, size_t size, struct group **result) {
- *result = nullptr;
-
- int err = walk_file(grp, [&] (group *entry) {
- return !strcmp(entry->gr_name, name);
- });
-
- if (err) {
- return err;
- }
-
- err = copy_to_buffer(grp, buffer, size);
- if (err) {
- return err;
- }
-
- *result = grp;
- return 0;
-}
-
-void setgrent(void) {
- if(!open_global_file()) {
- return;
- }
- rewind(global_file);
-}
-
-int setgroups(size_t size, const gid_t *list) {
- MLIBC_CHECK_OR_ENOSYS(mlibc::sys_setgroups, -1);
- if(int e = mlibc::sys_setgroups(size, list); e) {
- errno = e;
- return -1;
- }
- return 0;
-}
-
-int initgroups(const char *, gid_t) {
- mlibc::infoLogger() << "mlibc: initgroups is a stub" << frg::endlog;
- return 0;
-}
-
-int putgrent(const struct group *, FILE *) {
- __ensure(!"Not implemented");
- __builtin_unreachable();
-}
-
-struct group *fgetgrent(FILE *) {
- __ensure(!"Not implemented");
- __builtin_unreachable();
-}
-
-int getgrouplist(const char *, gid_t, gid_t *, int *) {
- mlibc::infoLogger() << "mlibc: getgrouplist is a stub" << frg::endlog;
- return 0;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 05:38:30 +0000