diff options
Diffstat (limited to 'src/proc_self_mountinfo.c')
| -rw-r--r-- | src/proc_self_mountinfo.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/src/proc_self_mountinfo.c b/src/proc_self_mountinfo.c new file mode 100644 index 000000000..45630b4c0 --- /dev/null +++ b/src/proc_self_mountinfo.c @@ -0,0 +1,231 @@ +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> + +#include "common.h" +#include "log.h" +#include "appconfig.h" + +#include "proc_self_mountinfo.h" + +// 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(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(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(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; + while(*e && *e != ',') e++; + + size_t len = e - s; + if(len == solen && !strncmp(s, super_options, len)) + return mi; + + if(*e == ',') s = ++e; + else s = e; + } + } + + return NULL; +} + + +// free a linked list of mountinfo structures +void mountinfo_free(struct mountinfo *mi) { + if(unlikely(!mi)) + return; + + if(likely(mi->next)) + mountinfo_free(mi->next); + + if(mi->root) free(mi->root); + if(mi->mount_point) free(mi->mount_point); + if(mi->mount_options) free(mi->mount_options); + +/* + 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); +*/ + free(mi->filesystem); + free(mi->mount_source); + free(mi->super_options); + free(mi); +} + +// read the whole mountinfo into a linked list +struct mountinfo *mountinfo_read() { + procfile *ff = NULL; + + char filename[FILENAME_MAX + 1]; + snprintfz(filename, FILENAME_MAX, "%s/proc/self/mountinfo", global_host_prefix); + ff = procfile_open(filename, " \t", PROCFILE_FLAG_DEFAULT); + if(!ff) { + snprintfz(filename, FILENAME_MAX, "%s/proc/1/mountinfo", global_host_prefix); + ff = procfile_open(filename, " \t", PROCFILE_FLAG_DEFAULT); + if(!ff) return NULL; + } + + ff = procfile_readall(ff); + if(!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(procfile_linewords(ff, l) < 5) + continue; + + mi = malloc(sizeof(struct mountinfo)); + if(unlikely(!mi)) fatal("Cannot allocate memory for mountinfo"); + + if(unlikely(!root)) + root = last = mi; + else + last->next = mi; + + last = mi; + mi->next = NULL; + + unsigned long w = 0; + mi->id = strtoul(procfile_lineword(ff, l, w), NULL, 10); w++; + mi->parentid = strtoul(procfile_lineword(ff, l, w), NULL, 10); w++; + + char *major = procfile_lineword(ff, l, w), *minor; w++; + for(minor = major; *minor && *minor != ':' ;minor++) ; + *minor = '\0'; + minor++; + + mi->major = strtoul(major, NULL, 10); + mi->minor = strtoul(minor, NULL, 10); + + mi->root = strdup(procfile_lineword(ff, l, w)); w++; + if(unlikely(!mi->root)) fatal("Cannot allocate memory"); + mi->root_hash = simple_hash(mi->root); + + mi->mount_point = strdup(procfile_lineword(ff, l, w)); w++; + if(unlikely(!mi->mount_point)) fatal("Cannot allocate memory"); + mi->mount_point_hash = simple_hash(mi->mount_point); + + mi->mount_options = strdup(procfile_lineword(ff, l, w)); w++; + if(unlikely(!mi->mount_options)) fatal("Cannot allocate memory"); + + // 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 = malloc(mi->optional_fields_count * sizeof(char *)); + if(unlikely(!mi->optional_fields)) + fatal("Cannot allocate memory for %d mountinfo optional fields", mi->optional_fields_count); + + int i; + for(i = 0; i < mi->optional_fields_count ; i++) { + *mi->optional_fields[wo] = strdup(procfile_lineword(ff, l, w)); + if(!mi->optional_fields[wo]) fatal("Cannot allocate memory"); + wo++; + } + } + else + mi->optional_fields = NULL; +*/ + + if(likely(*s == '-')) { + w++; + + mi->filesystem = strdup(procfile_lineword(ff, l, w)); w++; + if(!mi->filesystem) fatal("Cannot allocate memory"); + mi->filesystem_hash = simple_hash(mi->filesystem); + + mi->mount_source = strdup(procfile_lineword(ff, l, w)); w++; + if(!mi->mount_source) fatal("Cannot allocate memory"); + mi->mount_source_hash = simple_hash(mi->mount_source); + + mi->super_options = strdup(procfile_lineword(ff, l, w)); w++; + if(!mi->super_options) fatal("Cannot allocate memory"); + } + else { + mi->filesystem = NULL; + mi->mount_source = NULL; + mi->super_options = NULL; + } + +/* + info("MOUNTINFO: %u %u %u:%u root '%s', mount point '%s', mount options '%s', filesystem '%s', mount source '%s', super options '%s'", + mi->id, + mi->parentid, + mi->major, + mi->minor, + mi->root, + mi->mount_point, + mi->mount_options, + mi->filesystem, + mi->mount_source, + mi->super_options + ); +*/ + } + + procfile_close(ff); + return root; +} |