diff options
Diffstat (limited to 'collectors/proc.plugin/proc_self_mountinfo.c')
| -rw-r--r-- | collectors/proc.plugin/proc_self_mountinfo.c | 403 |
1 files changed, 403 insertions, 0 deletions
diff --git a/collectors/proc.plugin/proc_self_mountinfo.c b/collectors/proc.plugin/proc_self_mountinfo.c new file mode 100644 index 0000000..3f17ccc --- /dev/null +++ b/collectors/proc.plugin/proc_self_mountinfo.c @@ -0,0 +1,403 @@ +// 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) { + struct mountinfo *mi; + + for(mi = root; mi ; mi = mi->next) + if(unlikely(mi->major == major && mi->minor == minor)) + 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->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->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->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; +} |