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// SPDX-License-Identifier: GPL-3.0-or-later
#include "plugin_proc.h"
// ----------------------------------------------------------------------------
// taken from gnulib/mountlist.c
#ifndef ME_REMOTE
/* A file system is "remote" if its Fs_name contains a ':'
or if (it is of type (smbfs or cifs) and its Fs_name starts with '//')
or Fs_name is equal to "-hosts" (used by autofs to mount remote fs). */
# define ME_REMOTE(Fs_name, Fs_type) \
(strchr (Fs_name, ':') != NULL \
|| ((Fs_name)[0] == '/' \
&& (Fs_name)[1] == '/' \
&& (strcmp (Fs_type, "smbfs") == 0 \
|| strcmp (Fs_type, "cifs") == 0)) \
|| (strcmp("-hosts", Fs_name) == 0))
#endif
#define ME_DUMMY_0(Fs_name, Fs_type) \
(strcmp (Fs_type, "autofs") == 0 \
|| strcmp (Fs_type, "proc") == 0 \
|| strcmp (Fs_type, "subfs") == 0 \
/* for Linux 2.6/3.x */ \
|| strcmp (Fs_type, "debugfs") == 0 \
|| strcmp (Fs_type, "devpts") == 0 \
|| strcmp (Fs_type, "fusectl") == 0 \
|| strcmp (Fs_type, "mqueue") == 0 \
|| strcmp (Fs_type, "rpc_pipefs") == 0 \
|| strcmp (Fs_type, "sysfs") == 0 \
/* FreeBSD, Linux 2.4 */ \
|| strcmp (Fs_type, "devfs") == 0 \
/* for NetBSD 3.0 */ \
|| strcmp (Fs_type, "kernfs") == 0 \
/* for Irix 6.5 */ \
|| strcmp (Fs_type, "ignore") == 0)
/* Historically, we have marked as "dummy" any file system of type "none",
but now that programs like du need to know about bind-mounted directories,
we grant an exception to any with "bind" in its list of mount options.
I.e., those are *not* dummy entries. */
# define ME_DUMMY(Fs_name, Fs_type) \
(ME_DUMMY_0 (Fs_name, Fs_type) || strcmp (Fs_type, "none") == 0)
// ----------------------------------------------------------------------------
// find the mount info with the given major:minor
// in the supplied linked list of mountinfo structures
struct mountinfo *mountinfo_find(struct mountinfo *root, unsigned long major, unsigned long minor, char *device) {
struct mountinfo *mi;
uint32_t hash = simple_hash(device);
for(mi = root; mi ; mi = mi->next)
if (unlikely(
mi->major == major &&
mi->minor == minor &&
mi->mount_source_name_hash == hash &&
!strcmp(mi->mount_source_name, device)))
return mi;
return NULL;
}
// find the mount info with the given filesystem and mount_source
// in the supplied linked list of mountinfo structures
struct mountinfo *mountinfo_find_by_filesystem_mount_source(struct mountinfo *root, const char *filesystem, const char *mount_source) {
struct mountinfo *mi;
uint32_t filesystem_hash = simple_hash(filesystem), mount_source_hash = simple_hash(mount_source);
for(mi = root; mi ; mi = mi->next)
if(unlikely(mi->filesystem
&& mi->mount_source
&& mi->filesystem_hash == filesystem_hash
&& mi->mount_source_hash == mount_source_hash
&& !strcmp(mi->filesystem, filesystem)
&& !strcmp(mi->mount_source, mount_source)))
return mi;
return NULL;
}
struct mountinfo *mountinfo_find_by_filesystem_super_option(struct mountinfo *root, const char *filesystem, const char *super_options) {
struct mountinfo *mi;
uint32_t filesystem_hash = simple_hash(filesystem);
size_t solen = strlen(super_options);
for(mi = root; mi ; mi = mi->next)
if(unlikely(mi->filesystem
&& mi->super_options
&& mi->filesystem_hash == filesystem_hash
&& !strcmp(mi->filesystem, filesystem))) {
// super_options is a comma separated list
char *s = mi->super_options, *e;
while(*s) {
e = s + 1;
while(*e && *e != ',') e++;
size_t len = e - s;
if(unlikely(len == solen && !strncmp(s, super_options, len)))
return mi;
if(*e == ',') s = ++e;
else s = e;
}
}
return NULL;
}
static void mountinfo_free(struct mountinfo *mi) {
freez(mi->root);
freez(mi->mount_point);
freez(mi->mount_options);
freez(mi->persistent_id);
/*
if(mi->optional_fields_count) {
int i;
for(i = 0; i < mi->optional_fields_count ; i++)
free(*mi->optional_fields[i]);
}
free(mi->optional_fields);
*/
freez(mi->filesystem);
freez(mi->mount_source);
freez(mi->mount_source_name);
freez(mi->super_options);
freez(mi);
}
// free a linked list of mountinfo structures
void mountinfo_free_all(struct mountinfo *mi) {
while(mi) {
struct mountinfo *t = mi;
mi = mi->next;
mountinfo_free(t);
}
}
static char *strdupz_decoding_octal(const char *string) {
char *buffer = strdupz(string);
char *d = buffer;
const char *s = string;
while(*s) {
if(unlikely(*s == '\\')) {
s++;
if(likely(isdigit(*s) && isdigit(s[1]) && isdigit(s[2]))) {
char c = *s++ - '0';
c <<= 3;
c |= *s++ - '0';
c <<= 3;
c |= *s++ - '0';
*d++ = c;
}
else *d++ = '_';
}
else *d++ = *s++;
}
*d = '\0';
return buffer;
}
static inline int is_read_only(const char *s) {
if(!s) return 0;
size_t len = strlen(s);
if(len < 2) return 0;
if(len == 2) {
if(!strcmp(s, "ro")) return 1;
return 0;
}
if(!strncmp(s, "ro,", 3)) return 1;
if(!strncmp(&s[len - 3], ",ro", 3)) return 1;
if(strstr(s, ",ro,")) return 1;
return 0;
}
// read the whole mountinfo into a linked list
struct mountinfo *mountinfo_read(int do_statvfs) {
char filename[FILENAME_MAX + 1];
snprintfz(filename, FILENAME_MAX, "%s/proc/self/mountinfo", netdata_configured_host_prefix);
procfile *ff = procfile_open(filename, " \t", PROCFILE_FLAG_DEFAULT);
if(unlikely(!ff)) {
snprintfz(filename, FILENAME_MAX, "%s/proc/1/mountinfo", netdata_configured_host_prefix);
ff = procfile_open(filename, " \t", PROCFILE_FLAG_DEFAULT);
if(unlikely(!ff)) return NULL;
}
ff = procfile_readall(ff);
if(unlikely(!ff))
return NULL;
struct mountinfo *root = NULL, *last = NULL, *mi = NULL;
unsigned long l, lines = procfile_lines(ff);
for(l = 0; l < lines ;l++) {
if(unlikely(procfile_linewords(ff, l) < 5))
continue;
mi = mallocz(sizeof(struct mountinfo));
unsigned long w = 0;
mi->id = str2ul(procfile_lineword(ff, l, w)); w++;
mi->parentid = str2ul(procfile_lineword(ff, l, w)); w++;
char *major = procfile_lineword(ff, l, w), *minor; w++;
for(minor = major; *minor && *minor != ':' ;minor++) ;
if(unlikely(!*minor)) {
error("Cannot parse major:minor on '%s' at line %lu of '%s'", major, l + 1, filename);
freez(mi);
continue;
}
*minor = '\0';
minor++;
mi->flags = 0;
mi->major = str2ul(major);
mi->minor = str2ul(minor);
mi->root = strdupz(procfile_lineword(ff, l, w)); w++;
mi->root_hash = simple_hash(mi->root);
mi->mount_point = strdupz_decoding_octal(procfile_lineword(ff, l, w)); w++;
mi->mount_point_hash = simple_hash(mi->mount_point);
mi->persistent_id = strdupz(mi->mount_point);
netdata_fix_chart_id(mi->persistent_id);
mi->persistent_id_hash = simple_hash(mi->persistent_id);
mi->mount_options = strdupz(procfile_lineword(ff, l, w)); w++;
if(unlikely(is_read_only(mi->mount_options)))
mi->flags |= MOUNTINFO_READONLY;
// count the optional fields
/*
unsigned long wo = w;
*/
mi->optional_fields_count = 0;
char *s = procfile_lineword(ff, l, w);
while(*s && *s != '-') {
w++;
s = procfile_lineword(ff, l, w);
mi->optional_fields_count++;
}
/*
if(unlikely(mi->optional_fields_count)) {
// we have some optional fields
// read them into a new array of pointers;
mi->optional_fields = mallocz(mi->optional_fields_count * sizeof(char *));
int i;
for(i = 0; i < mi->optional_fields_count ; i++) {
*mi->optional_fields[wo] = strdupz(procfile_lineword(ff, l, w));
wo++;
}
}
else
mi->optional_fields = NULL;
*/
if(likely(*s == '-')) {
w++;
mi->filesystem = strdupz(procfile_lineword(ff, l, w)); w++;
mi->filesystem_hash = simple_hash(mi->filesystem);
mi->mount_source = strdupz_decoding_octal(procfile_lineword(ff, l, w)); w++;
mi->mount_source_hash = simple_hash(mi->mount_source);
mi->mount_source_name = strdupz(basename(mi->mount_source));
mi->mount_source_name_hash = simple_hash(mi->mount_source_name);
mi->super_options = strdupz(procfile_lineword(ff, l, w)); w++;
if(unlikely(is_read_only(mi->super_options)))
mi->flags |= MOUNTINFO_READONLY;
if(unlikely(ME_DUMMY(mi->mount_source, mi->filesystem)))
mi->flags |= MOUNTINFO_IS_DUMMY;
if(unlikely(ME_REMOTE(mi->mount_source, mi->filesystem)))
mi->flags |= MOUNTINFO_IS_REMOTE;
// mark as BIND the duplicates (i.e. same filesystem + same source)
if(do_statvfs) {
struct stat buf;
if(unlikely(stat(mi->mount_point, &buf) == -1)) {
mi->st_dev = 0;
mi->flags |= MOUNTINFO_NO_STAT;
}
else {
mi->st_dev = buf.st_dev;
struct mountinfo *mt;
for(mt = root; mt; mt = mt->next) {
if(unlikely(mt->st_dev == mi->st_dev && !(mt->flags & MOUNTINFO_IS_SAME_DEV))) {
if(strlen(mi->mount_point) < strlen(mt->mount_point))
mt->flags |= MOUNTINFO_IS_SAME_DEV;
else
mi->flags |= MOUNTINFO_IS_SAME_DEV;
}
}
}
}
else {
mi->st_dev = 0;
}
}
else {
mi->filesystem = NULL;
mi->filesystem_hash = 0;
mi->mount_source = NULL;
mi->mount_source_hash = 0;
mi->mount_source_name = NULL;
mi->mount_source_name_hash = 0;
mi->super_options = NULL;
mi->st_dev = 0;
}
// check if it has size
if(do_statvfs && !(mi->flags & MOUNTINFO_IS_DUMMY)) {
struct statvfs buff_statvfs;
if(unlikely(statvfs(mi->mount_point, &buff_statvfs) < 0)) {
mi->flags |= MOUNTINFO_NO_STAT;
}
else if(unlikely(!buff_statvfs.f_blocks /* || !buff_statvfs.f_files */)) {
mi->flags |= MOUNTINFO_NO_SIZE;
}
}
// link it
if(unlikely(!root))
root = mi;
else
last->next = mi;
last = mi;
mi->next = NULL;
/*
#ifdef NETDATA_INTERNAL_CHECKS
fprintf(stderr, "MOUNTINFO: %ld %ld %lu:%lu root '%s', persistent id '%s', mount point '%s', mount options '%s', filesystem '%s', mount source '%s', super options '%s'%s%s%s%s%s%s\n",
mi->id,
mi->parentid,
mi->major,
mi->minor,
mi->root,
mi->persistent_id,
(mi->mount_point)?mi->mount_point:"",
(mi->mount_options)?mi->mount_options:"",
(mi->filesystem)?mi->filesystem:"",
(mi->mount_source)?mi->mount_source:"",
(mi->super_options)?mi->super_options:"",
(mi->flags & MOUNTINFO_IS_DUMMY)?" DUMMY":"",
(mi->flags & MOUNTINFO_IS_BIND)?" BIND":"",
(mi->flags & MOUNTINFO_IS_REMOTE)?" REMOTE":"",
(mi->flags & MOUNTINFO_NO_STAT)?" NOSTAT":"",
(mi->flags & MOUNTINFO_NO_SIZE)?" NOSIZE":"",
(mi->flags & MOUNTINFO_IS_SAME_DEV)?" SAMEDEV":""
);
#endif
*/
}
/* find if the mount options have "bind" in them
{
FILE *fp = setmntent(MOUNTED, "r");
if (fp != NULL) {
struct mntent mntbuf;
struct mntent *mnt;
char buf[4096 + 1];
while ((mnt = getmntent_r(fp, &mntbuf, buf, 4096))) {
char *bind = hasmntopt(mnt, "bind");
if(unlikely(bind)) {
struct mountinfo *mi;
for(mi = root; mi ; mi = mi->next) {
if(unlikely(strcmp(mnt->mnt_dir, mi->mount_point) == 0)) {
fprintf(stderr, "Mount point '%s' is BIND\n", mi->mount_point);
mi->flags |= MOUNTINFO_IS_BIND;
break;
}
}
#ifdef NETDATA_INTERNAL_CHECKS
if(unlikely(!mi)) {
error("Mount point '%s' not found in /proc/self/mountinfo", mnt->mnt_dir);
}
#endif
}
}
endmntent(fp);
}
}
*/
procfile_close(ff);
return root;
}
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