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utils.c
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utils.c
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/*
* Copyright 2016 Jakub Klama <[email protected]>
* All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted providing that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include <inttypes.h>
#include <limits.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/uio.h>
#if defined(__FreeBSD__)
#include <sys/sbuf.h>
#else
#include "sbuf/sbuf.h"
#endif
#include "lib9p.h"
#include "fcall.h"
#include "linux_errno.h"
#ifdef __illumos__
#include <sys/sysmacros.h>
#include <grp.h>
#endif
#ifdef __APPLE__
#define GETGROUPS_GROUP_TYPE_IS_INT
#endif
#define N(ary) (sizeof(ary) / sizeof(*ary))
/* See l9p_describe_bits() below. */
struct descbits {
uint64_t db_mask; /* mask value */
uint64_t db_match; /* match value */
const char *db_name; /* name for matched value */
};
static bool l9p_describe_bits(const char *, uint64_t, const char *,
const struct descbits *, struct sbuf *);
static void l9p_describe_fid(const char *, uint32_t, struct sbuf *);
static void l9p_describe_mode(const char *, uint32_t, struct sbuf *);
static void l9p_describe_name(const char *, char *, struct sbuf *);
static void l9p_describe_perm(const char *, uint32_t, struct sbuf *);
static void l9p_describe_lperm(const char *, uint32_t, struct sbuf *);
static void l9p_describe_qid(const char *, struct l9p_qid *, struct sbuf *);
static void l9p_describe_l9stat(const char *, struct l9p_stat *,
enum l9p_version, struct sbuf *);
static void l9p_describe_statfs(const char *, struct l9p_statfs *,
struct sbuf *);
static void l9p_describe_time(struct sbuf *, const char *, uint64_t, uint64_t);
static void l9p_describe_readdir(struct sbuf *, struct l9p_f_io *);
static void l9p_describe_size(const char *, uint64_t, struct sbuf *);
static void l9p_describe_ugid(const char *, uint32_t, struct sbuf *);
static void l9p_describe_getattr_mask(uint64_t, struct sbuf *);
static void l9p_describe_unlinkat_flags(const char *, uint32_t, struct sbuf *);
static const char *lookup_linux_errno(uint32_t, char *, size_t);
/*
* Using indexed initializers, we can have these occur in any order.
* Using adjacent-string concatenation ("T" #name, "R" #name), we
* get both Tfoo and Rfoo strings with one copy of the name.
* Alas, there is no stupid cpp trick to lowercase-ify, so we
* have to write each name twice. In which case we might as well
* make the second one a string in the first place and not bother
* with the stringizing.
*
* This table should have entries for each enum value in fcall.h.
*/
#define X(NAME, name) [L9P_T##NAME - L9P__FIRST] = "T" name, \
[L9P_R##NAME - L9P__FIRST] = "R" name
static const char *ftype_names[] = {
X(VERSION, "version"),
X(AUTH, "auth"),
X(ATTACH, "attach"),
X(ERROR, "error"),
X(LERROR, "lerror"),
X(FLUSH, "flush"),
X(WALK, "walk"),
X(OPEN, "open"),
X(CREATE, "create"),
X(READ, "read"),
X(WRITE, "write"),
X(CLUNK, "clunk"),
X(REMOVE, "remove"),
X(STAT, "stat"),
X(WSTAT, "wstat"),
X(STATFS, "statfs"),
X(LOPEN, "lopen"),
X(LCREATE, "lcreate"),
X(SYMLINK, "symlink"),
X(MKNOD, "mknod"),
X(RENAME, "rename"),
X(READLINK, "readlink"),
X(GETATTR, "getattr"),
X(SETATTR, "setattr"),
X(XATTRWALK, "xattrwalk"),
X(XATTRCREATE, "xattrcreate"),
X(READDIR, "readdir"),
X(FSYNC, "fsync"),
X(LOCK, "lock"),
X(GETLOCK, "getlock"),
X(LINK, "link"),
X(MKDIR, "mkdir"),
X(RENAMEAT, "renameat"),
X(UNLINKAT, "unlinkat"),
};
#undef X
void
l9p_seek_iov(const struct iovec *iov1, size_t niov1, struct iovec *iov2,
size_t *niov2, size_t seek)
{
size_t remainder = 0;
size_t left = seek;
size_t i, j;
assert(niov1 <= L9P_MAX_IOV);
for (i = 0; i < niov1; i++) {
size_t toseek = MIN(left, iov1[i].iov_len);
left -= toseek;
if (toseek == iov1[i].iov_len)
continue;
if (left == 0) {
remainder = toseek;
break;
}
}
for (j = i; j < niov1; j++) {
iov2[j - i].iov_base = (char *)iov1[j].iov_base + remainder;
iov2[j - i].iov_len = iov1[j].iov_len - remainder;
remainder = 0;
}
*niov2 = j - i;
}
size_t
l9p_truncate_iov(struct iovec *iov, size_t niov, size_t length)
{
size_t i, done = 0;
for (i = 0; i < niov; i++) {
size_t toseek = MIN(length - done, iov[i].iov_len);
done += toseek;
if (toseek < iov[i].iov_len) {
iov[i].iov_len = toseek;
return (i + 1);
}
}
return (niov);
}
/*
* This wrapper for getgrouplist() that calloc'ed memory, and
* papers over FreeBSD vs Mac differences in the getgrouplist()
* argument types.
*
* Note that this function guarantees that *either*:
* return value != NULL and *angroups has been set
* or: return value == NULL and *angroups is 0
*/
gid_t *
l9p_getgrlist(const char *name, gid_t basegid, int *angroups)
{
#ifdef GETGROUPS_GROUP_TYPE_IS_INT
int i, *int_groups;
#endif
gid_t *groups;
int ngroups;
/*
* Todo, perhaps: while getgrouplist() returns -1, expand.
* For now just use NGROUPS_MAX.
*/
ngroups = NGROUPS_MAX;
groups = calloc((size_t)ngroups, sizeof(*groups));
#ifdef GETGROUPS_GROUP_TYPE_IS_INT
int_groups = groups ? calloc((size_t)ngroups, sizeof(*int_groups)) :
NULL;
if (int_groups == NULL) {
free(groups);
groups = NULL;
}
#endif
if (groups == NULL) {
*angroups = 0;
return (NULL);
}
#ifdef GETGROUPS_GROUP_TYPE_IS_INT
if (getgrouplist(name, (int)basegid, int_groups, &ngroups) < 0) {
free(groups);
free(int_groups);
return (NULL);
}
for (i = 0; i < ngroups; i++)
groups[i] = (gid_t)int_groups[i];
free(int_groups);
#else
if (getgrouplist(name, basegid, groups, &ngroups) < 0) {
free(groups);
return (NULL);
}
#endif
*angroups = ngroups;
return (groups);
}
/*
* For the various debug describe ops: decode bits in a bit-field-y
* value. For example, we might produce:
* value=0x3c[FOO,BAR,QUUX,?0x20]
* when FOO is bit 0x10, BAR is 0x08, and QUUX is 0x04 (as defined
* by the table). This leaves 0x20 (bit 5) as a mystery, while bits
* 4, 3, and 2 were decoded. (Bits 0 and 1 were 0 on input hence
* were not attempted here.)
*
* For general use we take a uint64_t <value>. The bit description
* table <db> is an array of {mask, match, str} values ending with
* {0, 0, NULL}.
*
* If <str> is non-NULL we'll print it and the mask as well (if
* str is NULL we'll print neither). The mask is always printed in
* hex at the moment. See undec description too.
*
* For convenience, you can use a mask-and-match value, e.g., to
* decode a 2-bit field in bits 0 and 1 you can mask against 3 and
* match the values 0, 1, 2, and 3. To handle this, make sure that
* all masks-with-same-match are sequential.
*
* If there are any nonzero undecoded bits, print them after
* all the decode-able bits have been handled.
*
* The <oc> argument defines the open and close bracket characters,
* typically "[]", that surround the entire string. If NULL, no
* brackets are added, else oc[0] goes in the front and oc[1] at
* the end, after printing any <str><value> part.
*
* Returns true if it printed anything (other than the implied
* str-and-value, that is).
*/
static bool
l9p_describe_bits(const char *str, uint64_t value, const char *oc,
const struct descbits *db, struct sbuf *sb)
{
const char *sep;
char bracketbuf[2] = "";
bool printed = false;
if (str != NULL)
sbuf_printf(sb, "%s0x%" PRIx64, str, value);
if (oc != NULL)
bracketbuf[0] = oc[0];
sep = bracketbuf;
for (; db->db_name != NULL; db++) {
if ((value & db->db_mask) == db->db_match) {
sbuf_printf(sb, "%s%s", sep, db->db_name);
sep = ",";
printed = true;
/*
* Clear the field, and make sure we
* won't match a zero-valued field with
* this same mask.
*/
value &= ~db->db_mask;
while (db[1].db_mask == db->db_mask &&
db[1].db_name != NULL)
db++;
}
}
if (value != 0) {
sbuf_printf(sb, "%s?0x%" PRIx64, sep, value);
printed = true;
}
if (printed && oc != NULL) {
bracketbuf[0] = oc[1];
sbuf_cat(sb, bracketbuf);
}
return (printed);
}
/*
* Show file ID.
*/
static void
l9p_describe_fid(const char *str, uint32_t fid, struct sbuf *sb)
{
sbuf_printf(sb, "%s%" PRIu32, str, fid);
}
/*
* Show user or group ID.
*/
static void
l9p_describe_ugid(const char *str, uint32_t ugid, struct sbuf *sb)
{
sbuf_printf(sb, "%s%" PRIu32, str, ugid);
}
/*
* Show file mode (O_RDWR, O_RDONLY, etc). The argument is
* an l9p_omode, not a Linux flags mode. Linux flags are
* decoded with l9p_describe_lflags.
*/
static void
l9p_describe_mode(const char *str, uint32_t mode, struct sbuf *sb)
{
static const struct descbits bits[] = {
{ L9P_OACCMODE, L9P_OREAD, "OREAD" },
{ L9P_OACCMODE, L9P_OWRITE, "OWRITE" },
{ L9P_OACCMODE, L9P_ORDWR, "ORDWR" },
{ L9P_OACCMODE, L9P_OEXEC, "OEXEC" },
{ L9P_OCEXEC, L9P_OCEXEC, "OCEXEC" },
{ L9P_ODIRECT, L9P_ODIRECT, "ODIRECT" },
{ L9P_ORCLOSE, L9P_ORCLOSE, "ORCLOSE" },
{ L9P_OTRUNC, L9P_OTRUNC, "OTRUNC" },
{ 0, 0, NULL }
};
(void) l9p_describe_bits(str, mode, "[]", bits, sb);
}
/*
* Show Linux mode/flags.
*/
static void
l9p_describe_lflags(const char *str, uint32_t flags, struct sbuf *sb)
{
static const struct descbits bits[] = {
{ L9P_OACCMODE, L9P_OREAD, "O_READ" },
{ L9P_OACCMODE, L9P_OWRITE, "O_WRITE" },
{ L9P_OACCMODE, L9P_ORDWR, "O_RDWR" },
{ L9P_OACCMODE, L9P_OEXEC, "O_EXEC" },
{ L9P_L_O_APPEND, L9P_L_O_APPEND, "O_APPEND" },
{ L9P_L_O_CLOEXEC, L9P_L_O_CLOEXEC, "O_CLOEXEC" },
{ L9P_L_O_CREAT, L9P_L_O_CREAT, "O_CREAT" },
{ L9P_L_O_DIRECT, L9P_L_O_DIRECT, "O_DIRECT" },
{ L9P_L_O_DIRECTORY, L9P_L_O_DIRECTORY, "O_DIRECTORY" },
{ L9P_L_O_DSYNC, L9P_L_O_DSYNC, "O_DSYNC" },
{ L9P_L_O_EXCL, L9P_L_O_EXCL, "O_EXCL" },
{ L9P_L_O_FASYNC, L9P_L_O_FASYNC, "O_FASYNC" },
{ L9P_L_O_LARGEFILE, L9P_L_O_LARGEFILE, "O_LARGEFILE" },
{ L9P_L_O_NOATIME, L9P_L_O_NOATIME, "O_NOATIME" },
{ L9P_L_O_NOCTTY, L9P_L_O_NOCTTY, "O_NOCTTY" },
{ L9P_L_O_NOFOLLOW, L9P_L_O_NOFOLLOW, "O_NOFOLLOW" },
{ L9P_L_O_NONBLOCK, L9P_L_O_NONBLOCK, "O_NONBLOCK" },
{ L9P_L_O_PATH, L9P_L_O_PATH, "O_PATH" },
{ L9P_L_O_SYNC, L9P_L_O_SYNC, "O_SYNC" },
{ L9P_L_O_TMPFILE, L9P_L_O_TMPFILE, "O_TMPFILE" },
{ L9P_L_O_TMPFILE, L9P_L_O_TMPFILE, "O_TMPFILE" },
{ L9P_L_O_TRUNC, L9P_L_O_TRUNC, "O_TRUNC" },
{ 0, 0, NULL }
};
(void) l9p_describe_bits(str, flags, "[]", bits, sb);
}
/*
* Show file name or other similar, potentially-very-long string.
* Actual strings get quotes, a NULL name (if it occurs) gets
* <null> (no quotes), so you can tell the difference.
*/
static void
l9p_describe_name(const char *str, char *name, struct sbuf *sb)
{
size_t len;
if (name == NULL) {
sbuf_printf(sb, "%s<null>", str);
return;
}
len = strlen(name);
if (len > 32)
sbuf_printf(sb, "%s\"%.*s...\"", str, 32 - 3, name);
else
sbuf_printf(sb, "%s\"%.*s\"", str, (int)len, name);
}
#define STRMODE_SIZE 12
#ifdef __illumos__
static void
strmode(mode_t mode, char *bp)
{
char *const sbp = bp;
/*
* The single caller does not pass in the file type as part of 'mode',
* and ignores the first character in the returned buffer anyway.
*/
*bp++ = '?';
#define ONE(_cmp, _ch) ((mode & (_cmp)) != 0) ? (_ch) : '-'
*bp++ = ONE(S_IRUSR, 'r');
*bp++ = ONE(S_IWUSR, 'w');
switch (mode & (S_ISUID|S_IXUSR)) {
case S_ISUID|S_IXUSR:
*bp++ = 's';
break;
case S_ISUID:
*bp++ = 'S';
break;
case S_IXUSR:
*bp++ = 'x';
break;
case 0:
*bp++ = '-';
}
*bp++ = ONE(S_IRGRP, 'r');
*bp++ = ONE(S_IWGRP, 'w');
switch (mode & (S_ISGID|S_IXGRP|S_IFREG)) {
case S_ISGID|S_IXGRP:
*bp++ = 's';
break;
case S_ISGID|S_IFREG:
*bp++ = 'L';
break;
case S_ISGID:
*bp++ = 'S';
break;
case S_IXGRP:
*bp++ = 'x';
break;
default:
*bp++ = '-';
}
*bp++ = ONE(S_IROTH, 'r');
*bp++ = ONE(S_IWOTH, 'w');
switch (mode & (S_ISVTX|S_IXOTH)) {
case S_ISVTX|S_IXOTH:
*bp++ = 't';
break;
case S_ISVTX:
*bp++ = 'T';
break;
case S_IXOTH:
*bp++ = 'x';
break;
default:
*bp++ = '-';
}
*bp++ = ' ';
*bp = '\0';
assert(bp - sbp <= STRMODE_SIZE);
#undef ONE
}
#endif /* __illumos__ */
/*
* Show permissions (rwx etc). Prints the value in hex only if
* the rwx bits do not cover the entire value.
*/
static void
l9p_describe_perm(const char *str, uint32_t mode, struct sbuf *sb)
{
char pbuf[STRMODE_SIZE];
strmode(mode & 0777, pbuf);
if ((mode & ~(uint32_t)0777) != 0)
sbuf_printf(sb, "%s0x%" PRIx32 "<%.9s>", str, mode, pbuf + 1);
else
sbuf_printf(sb, "%s<%.9s>", str, pbuf + 1);
}
/*
* Show "extended" permissions: regular permissions, but also the
* various DM* extension bits from 9P2000.u.
*/
static void
l9p_describe_ext_perm(const char *str, uint32_t mode, struct sbuf *sb)
{
static const struct descbits bits[] = {
{ L9P_DMDIR, L9P_DMDIR, "DMDIR" },
{ L9P_DMAPPEND, L9P_DMAPPEND, "DMAPPEND" },
{ L9P_DMEXCL, L9P_DMEXCL, "DMEXCL" },
{ L9P_DMMOUNT, L9P_DMMOUNT, "DMMOUNT" },
{ L9P_DMAUTH, L9P_DMAUTH, "DMAUTH" },
{ L9P_DMTMP, L9P_DMTMP, "DMTMP" },
{ L9P_DMSYMLINK, L9P_DMSYMLINK, "DMSYMLINK" },
{ L9P_DMDEVICE, L9P_DMDEVICE, "DMDEVICE" },
{ L9P_DMNAMEDPIPE, L9P_DMNAMEDPIPE, "DMNAMEDPIPE" },
{ L9P_DMSOCKET, L9P_DMSOCKET, "DMSOCKET" },
{ L9P_DMSETUID, L9P_DMSETUID, "DMSETUID" },
{ L9P_DMSETGID, L9P_DMSETGID, "DMSETGID" },
{ 0, 0, NULL }
};
bool need_sep;
sbuf_printf(sb, "%s[", str);
need_sep = l9p_describe_bits(NULL, mode & ~(uint32_t)0777, NULL,
bits, sb);
l9p_describe_perm(need_sep ? "," : "", mode & 0777, sb);
sbuf_cat(sb, "]");
}
/*
* Show Linux-specific permissions: regular permissions, but also
* the S_IFMT field.
*/
static void
l9p_describe_lperm(const char *str, uint32_t mode, struct sbuf *sb)
{
static const struct descbits bits[] = {
{ S_IFMT, S_IFIFO, "S_IFIFO" },
{ S_IFMT, S_IFCHR, "S_IFCHR" },
{ S_IFMT, S_IFDIR, "S_IFDIR" },
{ S_IFMT, S_IFBLK, "S_IFBLK" },
{ S_IFMT, S_IFREG, "S_IFREG" },
{ S_IFMT, S_IFLNK, "S_IFLNK" },
{ S_IFMT, S_IFSOCK, "S_IFSOCK" },
#ifdef __illumos__
{ S_IFMT, S_IFDOOR, "S_IFDOOR" },
{ S_IFMT, S_IFPORT, "S_IFPORT" },
#endif
{ 0, 0, NULL }
};
bool need_sep;
sbuf_printf(sb, "%s[", str);
need_sep = l9p_describe_bits(NULL, mode & ~(uint32_t)0777, NULL,
bits, sb);
l9p_describe_perm(need_sep ? "," : "", mode & 0777, sb);
sbuf_cat(sb, "]");
}
/*
* Show qid (<type, version, path> tuple).
*/
static void
l9p_describe_qid(const char *str, struct l9p_qid *qid, struct sbuf *sb)
{
static const struct descbits bits[] = {
/*
* NB: L9P_QTFILE is 0, i.e., is implied by no
* other bits being set. We get this produced
* when we mask against 0xff and compare for
* L9P_QTFILE, but we must do it first so that
* we mask against the original (not-adjusted)
* value.
*/
{ 0xff, L9P_QTFILE, "FILE" },
{ L9P_QTDIR, L9P_QTDIR, "DIR" },
{ L9P_QTAPPEND, L9P_QTAPPEND, "APPEND" },
{ L9P_QTEXCL, L9P_QTEXCL, "EXCL" },
{ L9P_QTMOUNT, L9P_QTMOUNT, "MOUNT" },
{ L9P_QTAUTH, L9P_QTAUTH, "AUTH" },
{ L9P_QTTMP, L9P_QTTMP, "TMP" },
{ L9P_QTSYMLINK, L9P_QTSYMLINK, "SYMLINK" },
{ 0, 0, NULL }
};
assert(qid != NULL);
sbuf_cat(sb, str);
(void) l9p_describe_bits("<", qid->type, "[]", bits, sb);
sbuf_printf(sb, ",%" PRIu32 ",0x%016" PRIx64 ">",
qid->version, qid->path);
}
/*
* Show size.
*/
static void
l9p_describe_size(const char *str, uint64_t size, struct sbuf *sb)
{
sbuf_printf(sb, "%s%" PRIu64, str, size);
}
/*
* Show l9stat (including 9P2000.u extensions if appropriate).
*/
static void
l9p_describe_l9stat(const char *str, struct l9p_stat *st,
enum l9p_version version, struct sbuf *sb)
{
bool dotu = version >= L9P_2000U;
assert(st != NULL);
sbuf_printf(sb, "%stype=0x%04" PRIx32 " dev=0x%08" PRIx32, str,
st->type, st->dev);
l9p_describe_qid(" qid=", &st->qid, sb);
l9p_describe_ext_perm(" mode=", st->mode, sb);
if (st->atime != (uint32_t)-1)
sbuf_printf(sb, " atime=%" PRIu32, st->atime);
if (st->mtime != (uint32_t)-1)
sbuf_printf(sb, " mtime=%" PRIu32, st->mtime);
if (st->length != (uint64_t)-1)
sbuf_printf(sb, " length=%" PRIu64, st->length);
l9p_describe_name(" name=", st->name, sb);
/*
* It's pretty common to have NULL name+gid+muid. They're
* just noise if NULL *and* dot-u; decode only if non-null
* or not-dot-u.
*/
if (st->uid != NULL || !dotu)
l9p_describe_name(" uid=", st->uid, sb);
if (st->gid != NULL || !dotu)
l9p_describe_name(" gid=", st->gid, sb);
if (st->muid != NULL || !dotu)
l9p_describe_name(" muid=", st->muid, sb);
if (dotu) {
if (st->extension != NULL)
l9p_describe_name(" extension=", st->extension, sb);
sbuf_printf(sb,
" n_uid=%" PRIu32 " n_gid=%" PRIu32 " n_muid=%" PRIu32,
st->n_uid, st->n_gid, st->n_muid);
}
}
static void
l9p_describe_statfs(const char *str, struct l9p_statfs *st, struct sbuf *sb)
{
assert(st != NULL);
sbuf_printf(sb, "%stype=0x%04lx bsize=%lu blocks=%" PRIu64
" bfree=%" PRIu64 " bavail=%" PRIu64 " files=%" PRIu64
" ffree=%" PRIu64 " fsid=0x%" PRIx64 " namelen=%" PRIu32 ">",
str, (u_long)st->type, (u_long)st->bsize, st->blocks,
st->bfree, st->bavail, st->files,
st->ffree, st->fsid, st->namelen);
}
/*
* Decode a <seconds,nsec> timestamp.
*
* Perhaps should use asctime_r. For now, raw values.
*/
static void
l9p_describe_time(struct sbuf *sb, const char *s, uint64_t sec, uint64_t nsec)
{
sbuf_cat(sb, s);
if (nsec > 999999999)
sbuf_printf(sb, "%" PRIu64 ".<invalid nsec %" PRIu64 ">)",
sec, nsec);
else
sbuf_printf(sb, "%" PRIu64 ".%09" PRIu64, sec, nsec);
}
/*
* Decode readdir data (.L format, variable length names).
*/
static void
l9p_describe_readdir(struct sbuf *sb, struct l9p_f_io *io)
{
uint32_t count;
#ifdef notyet
int i;
struct l9p_message msg;
struct l9p_dirent de;
#endif
if ((count = io->count) == 0) {
sbuf_printf(sb, " EOF (count=0)");
return;
}
/*
* Can't do this yet because we do not have the original
* req.
*/
#ifdef notyet
sbuf_printf(sb, " count=%" PRIu32 " [", count);
l9p_init_msg(&msg, req, L9P_UNPACK);
for (i = 0; msg.lm_size < count; i++) {
if (l9p_pudirent(&msg, &de) < 0) {
sbuf_printf(sb, " bad count");
break;
}
sbuf_printf(sb, i ? ", " : " ");
l9p_describe_qid(" qid=", &de.qid, sb);
sbuf_printf(sb, " offset=%" PRIu64 " type=%d",
de.offset, de.type);
l9p_describe_name(" name=", de.name);
free(de.name);
}
sbuf_printf(sb, "]=%d dir entries", i);
#else /* notyet */
sbuf_printf(sb, " count=%" PRIu32, count);
#endif
}
/*
* Decode Tgetattr request_mask field.
*/
static void
l9p_describe_getattr_mask(uint64_t request_mask, struct sbuf *sb)
{
static const struct descbits bits[] = {
/*
* Note: ALL and BASIC must occur first and second.
* This is a little dirty: it depends on the way the
* describe_bits code clears the values. If we
* match ALL, we clear all those bits and do not
* match BASIC; if we match BASIC, we clear all
* those bits and do not match individual bits. Thus
* if we have BASIC but not all the additional bits,
* we'll see, e.g., [BASIC,BTIME,GEN]; if we have
* all the additional bits too, we'll see [ALL].
*
* Since <undec> is true below, we'll also spot any
* bits added to the protocol since we made this table.
*/
{ L9PL_GETATTR_ALL, L9PL_GETATTR_ALL, "ALL" },
{ L9PL_GETATTR_BASIC, L9PL_GETATTR_BASIC, "BASIC" },
/* individual bits in BASIC */
{ L9PL_GETATTR_MODE, L9PL_GETATTR_MODE, "MODE" },
{ L9PL_GETATTR_NLINK, L9PL_GETATTR_NLINK, "NLINK" },
{ L9PL_GETATTR_UID, L9PL_GETATTR_UID, "UID" },
{ L9PL_GETATTR_GID, L9PL_GETATTR_GID, "GID" },
{ L9PL_GETATTR_RDEV, L9PL_GETATTR_RDEV, "RDEV" },
{ L9PL_GETATTR_ATIME, L9PL_GETATTR_ATIME, "ATIME" },
{ L9PL_GETATTR_MTIME, L9PL_GETATTR_MTIME, "MTIME" },
{ L9PL_GETATTR_CTIME, L9PL_GETATTR_CTIME, "CTIME" },
{ L9PL_GETATTR_INO, L9PL_GETATTR_INO, "INO" },
{ L9PL_GETATTR_SIZE, L9PL_GETATTR_SIZE, "SIZE" },
{ L9PL_GETATTR_BLOCKS, L9PL_GETATTR_BLOCKS, "BLOCKS" },
/* additional bits in ALL */
{ L9PL_GETATTR_BTIME, L9PL_GETATTR_BTIME, "BTIME" },
{ L9PL_GETATTR_GEN, L9PL_GETATTR_GEN, "GEN" },
{ L9PL_GETATTR_DATA_VERSION, L9PL_GETATTR_DATA_VERSION,
"DATA_VERSION" },
{ 0, 0, NULL }
};
(void) l9p_describe_bits(" request_mask=", request_mask, "[]", bits,
sb);
}
/*
* Decode Tunlinkat flags.
*/
static void
l9p_describe_unlinkat_flags(const char *str, uint32_t flags, struct sbuf *sb)
{
static const struct descbits bits[] = {
{ L9PL_AT_REMOVEDIR, L9PL_AT_REMOVEDIR, "AT_REMOVEDIR" },
{ 0, 0, NULL }
};
(void) l9p_describe_bits(str, flags, "[]", bits, sb);
}
static const char *
lookup_linux_errno(uint32_t linux_errno, char *buf, size_t len)
{
/*
* Error numbers in the "base" range (1..ERANGE) are common
* across BSD, MacOS, Linux, and Plan 9.
*
* Error numbers outside that range require translation.
*/
const char *const table[] = {
#define X0(name) [name] = name ## _STR
#define X(name) [name] = name ## _STR
X(LINUX_EAGAIN),
X(LINUX_EDEADLK),
X(LINUX_ENAMETOOLONG),
X(LINUX_ENOLCK),
X(LINUX_ENOSYS),
X(LINUX_ENOTEMPTY),
X(LINUX_ELOOP),
X(LINUX_ENOMSG),
X(LINUX_EIDRM),
X(LINUX_ECHRNG),
X(LINUX_EL2NSYNC),
X(LINUX_EL3HLT),
X(LINUX_EL3RST),
X(LINUX_ELNRNG),
X(LINUX_EUNATCH),
X(LINUX_ENOCSI),
X(LINUX_EL2HLT),
X(LINUX_EBADE),
X(LINUX_EBADR),
X(LINUX_EXFULL),
X(LINUX_ENOANO),
X(LINUX_EBADRQC),
X(LINUX_EBADSLT),
X(LINUX_EBFONT),
X(LINUX_ENOSTR),
X(LINUX_ENODATA),
X(LINUX_ETIME),
X(LINUX_ENOSR),
X(LINUX_ENONET),
X(LINUX_ENOPKG),
X(LINUX_EREMOTE),
X(LINUX_ENOLINK),
X(LINUX_EADV),
X(LINUX_ESRMNT),
X(LINUX_ECOMM),
X(LINUX_EPROTO),
X(LINUX_EMULTIHOP),
X(LINUX_EDOTDOT),
X(LINUX_EBADMSG),
X(LINUX_EOVERFLOW),
X(LINUX_ENOTUNIQ),
X(LINUX_EBADFD),
X(LINUX_EREMCHG),
X(LINUX_ELIBACC),
X(LINUX_ELIBBAD),
X(LINUX_ELIBSCN),
X(LINUX_ELIBMAX),
X(LINUX_ELIBEXEC),
X(LINUX_EILSEQ),
X(LINUX_ERESTART),
X(LINUX_ESTRPIPE),
X(LINUX_EUSERS),
X(LINUX_ENOTSOCK),
X(LINUX_EDESTADDRREQ),
X(LINUX_EMSGSIZE),
X(LINUX_EPROTOTYPE),
X(LINUX_ENOPROTOOPT),
X(LINUX_EPROTONOSUPPORT),
X(LINUX_ESOCKTNOSUPPORT),
X(LINUX_EOPNOTSUPP),
X(LINUX_EPFNOSUPPORT),
X(LINUX_EAFNOSUPPORT),
X(LINUX_EADDRINUSE),
X(LINUX_EADDRNOTAVAIL),
X(LINUX_ENETDOWN),
X(LINUX_ENETUNREACH),
X(LINUX_ENETRESET),
X(LINUX_ECONNABORTED),
X(LINUX_ECONNRESET),
X(LINUX_ENOBUFS),
X(LINUX_EISCONN),
X(LINUX_ENOTCONN),
X(LINUX_ESHUTDOWN),
X(LINUX_ETOOMANYREFS),
X(LINUX_ETIMEDOUT),
X(LINUX_ECONNREFUSED),
X(LINUX_EHOSTDOWN),
X(LINUX_EHOSTUNREACH),
X(LINUX_EALREADY),
X(LINUX_EINPROGRESS),
X(LINUX_ESTALE),
X(LINUX_EUCLEAN),
X(LINUX_ENOTNAM),
X(LINUX_ENAVAIL),
X(LINUX_EISNAM),
X(LINUX_EREMOTEIO),
X(LINUX_EDQUOT),
X(LINUX_ENOMEDIUM),
X(LINUX_EMEDIUMTYPE),
X(LINUX_ECANCELED),
X(LINUX_ENOKEY),
X(LINUX_EKEYEXPIRED),
X(LINUX_EKEYREVOKED),
X(LINUX_EKEYREJECTED),
X(LINUX_EOWNERDEAD),
X(LINUX_ENOTRECOVERABLE),
X(LINUX_ERFKILL),
X(LINUX_EHWPOISON),
#undef X0
#undef X
};
if ((size_t)linux_errno < N(table) && table[linux_errno] != NULL)
return (table[linux_errno]);
if (linux_errno <= ERANGE)
return (strerror((int)linux_errno));
(void) snprintf(buf, len, "Unknown error %d", linux_errno);
return (buf);
}
void
l9p_describe_fcall(union l9p_fcall *fcall, enum l9p_version version,
struct sbuf *sb)
{
uint64_t mask;
uint8_t type;
int i;
assert(fcall != NULL);
assert(sb != NULL);
assert(version <= L9P_2000L);
type = fcall->hdr.type;
if (type < L9P__FIRST || type >= L9P__LAST_PLUS_1 ||
ftype_names[type - L9P__FIRST] == NULL) {
const char *rr;
/*
* Can't say for sure that this distinction --
* an even number is a request, an odd one is
* a response -- will be maintained forever,
* but it's good enough for now.
*/
rr = (type & 1) != 0 ? "response" : "request";
sbuf_printf(sb, "<unknown %s %d> tag=%d", rr, type,
fcall->hdr.tag);
} else {
sbuf_printf(sb, "%s tag=%d", ftype_names[type - L9P__FIRST],
fcall->hdr.tag);
}
switch (type) {
case L9P_TVERSION:
case L9P_RVERSION:
sbuf_printf(sb, " version=\"%s\" msize=%d", fcall->version.version,
fcall->version.msize);
return;
case L9P_TAUTH:
l9p_describe_fid(" afid=", fcall->hdr.fid, sb);
sbuf_printf(sb, " uname=\"%s\" aname=\"%s\"",
fcall->tauth.uname, fcall->tauth.aname);
return;
case L9P_TATTACH:
l9p_describe_fid(" fid=", fcall->hdr.fid, sb);
l9p_describe_fid(" afid=", fcall->tattach.afid, sb);
sbuf_printf(sb, " uname=\"%s\" aname=\"%s\"",
fcall->tattach.uname, fcall->tattach.aname);
if (version >= L9P_2000U)
sbuf_printf(sb, " n_uname=%d", fcall->tattach.n_uname);
return;
case L9P_RATTACH:
l9p_describe_qid(" ", &fcall->rattach.qid, sb);
return;
case L9P_RERROR:
sbuf_printf(sb, " ename=\"%s\" errnum=%d", fcall->error.ename,
fcall->error.errnum);
return;
case L9P_RLERROR: {
char unknown[50];
sbuf_printf(sb, " errnum=%d (%s)", fcall->error.errnum,
lookup_linux_errno(fcall->error.errnum,
unknown, sizeof(unknown)));
return;
}
case L9P_TFLUSH:
sbuf_printf(sb, " oldtag=%d", fcall->tflush.oldtag);
return;
case L9P_RFLUSH:
return;
case L9P_TWALK:
l9p_describe_fid(" fid=", fcall->hdr.fid, sb);
l9p_describe_fid(" newfid=", fcall->twalk.newfid, sb);