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refactor(config,metadata): shared invariants; length-bounded metadata parser

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TapTap
2026-09-13 05:24:23 +02:00
parent 57ce6d04f0
commit eea66a7848
11 changed files with 422 additions and 280 deletions
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src/shared/metadata.c
+32 -31
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@@ -90,63 +90,65 @@ void metadata_to_buf(char** buf, const FileMetadata* m) {
*buf += sizeof(crtime_nsec);
}
FileMetadata* metadata_from_buf(char** buf) {
FileMetadata* metadata_from_buf(const uint8_t* buf, size_t len) {
if (buf == NULL || len < sizeof(int32_t))
return NULL;
int32_t present;
memcpy(&present, *buf, sizeof(present));
*buf += sizeof(present);
if (present != 0 && present != 1)
memcpy(&present, buf, sizeof(present));
if (present != 1)
return NULL;
if (!present)
if (len < sizeof(int32_t) + FILE_METADATA_WIRE_SIZE)
return NULL;
const uint8_t* cursor = buf + sizeof(int32_t);
FileMetadata* m = protocol_alloc(sizeof(FileMetadata));
if (m == NULL)
return NULL;
int32_t mode;
memcpy(&mode, *buf, sizeof(mode));
*buf += sizeof(mode);
memcpy(&mode, cursor, sizeof(mode));
cursor += sizeof(mode);
m->mode = (mode_t)mode;
int32_t uid;
memcpy(&uid, *buf, sizeof(uid));
*buf += sizeof(uid);
memcpy(&uid, cursor, sizeof(uid));
cursor += sizeof(uid);
m->uid = (uid_t)uid;
int32_t gid;
memcpy(&gid, *buf, sizeof(gid));
*buf += sizeof(gid);
memcpy(&gid, cursor, sizeof(gid));
cursor += sizeof(gid);
m->gid = (gid_t)gid;
int64_t mtime_sec;
memcpy(&mtime_sec, *buf, sizeof(mtime_sec));
*buf += sizeof(mtime_sec);
memcpy(&mtime_sec, cursor, sizeof(mtime_sec));
cursor += sizeof(mtime_sec);
m->mtime_sec = (time_t)mtime_sec;
int64_t mtime_nsec;
memcpy(&mtime_nsec, *buf, sizeof(mtime_nsec));
*buf += sizeof(mtime_nsec);
memcpy(&mtime_nsec, cursor, sizeof(mtime_nsec));
cursor += sizeof(mtime_nsec);
m->mtime_nsec = (long)mtime_nsec;
int32_t atime_valid;
memcpy(&atime_valid, *buf, sizeof(atime_valid));
*buf += sizeof(atime_valid);
memcpy(&atime_valid, cursor, sizeof(atime_valid));
cursor += sizeof(atime_valid);
int64_t atime_sec;
memcpy(&atime_sec, *buf, sizeof(atime_sec));
*buf += sizeof(atime_sec);
memcpy(&atime_sec, cursor, sizeof(atime_sec));
cursor += sizeof(atime_sec);
int64_t atime_nsec;
memcpy(&atime_nsec, *buf, sizeof(atime_nsec));
*buf += sizeof(atime_nsec);
memcpy(&atime_nsec, cursor, sizeof(atime_nsec));
cursor += sizeof(atime_nsec);
int32_t crtime_valid;
memcpy(&crtime_valid, *buf, sizeof(crtime_valid));
*buf += sizeof(crtime_valid);
memcpy(&crtime_valid, cursor, sizeof(crtime_valid));
cursor += sizeof(crtime_valid);
int64_t crtime_sec;
memcpy(&crtime_sec, *buf, sizeof(crtime_sec));
*buf += sizeof(crtime_sec);
memcpy(&crtime_sec, cursor, sizeof(crtime_sec));
cursor += sizeof(crtime_sec);
int64_t crtime_nsec;
memcpy(&crtime_nsec, *buf, sizeof(crtime_nsec));
*buf += sizeof(crtime_nsec);
memcpy(&crtime_nsec, cursor, sizeof(crtime_nsec));
cursor += sizeof(crtime_nsec);
m->atime_valid = atime_valid != 0;
m->atime_sec = (time_t)atime_sec;
m->atime_nsec = (long)atime_nsec;
m->crtime_valid = crtime_valid != 0;
m->crtime_sec = (time_t)crtime_sec;
m->crtime_nsec = (long)crtime_nsec;
if (present != 1 || mtime_nsec < 0 || mtime_nsec >= 1000000000LL || mode < 0 || uid < 0 ||
gid < 0 || atime_valid < 0 || atime_valid > 1 || crtime_valid < 0 || crtime_valid > 1 ||
if (mtime_nsec < 0 || mtime_nsec >= 1000000000LL || mode < 0 || uid < 0 || gid < 0 ||
atime_valid < 0 || atime_valid > 1 || crtime_valid < 0 || crtime_valid > 1 ||
(atime_valid && (atime_nsec < 0 || atime_nsec >= 1000000000LL)) ||
(crtime_valid && (crtime_nsec < 0 || crtime_nsec >= 1000000000LL))) {
free(m);
@@ -196,8 +198,7 @@ FileMetadata* metadata_receive(int file_descriptor, int* ok) {
*ok = 0;
return NULL;
}
char* cursor = packed;
FileMetadata* m = metadata_from_buf(&cursor);
FileMetadata* m = metadata_from_buf((const uint8_t*)packed, sizeof(packed));
if (m == NULL) {
if (ok)
*ok = 0;