--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/dav/libxattr.c Mon Jan 01 19:53:36 2018 +0100
@@ -0,0 +1,444 @@
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "libxattr.h"
+
+#include <errno.h>
+#include <sys/types.h>
+
+#include <string.h>
+
+#define LIST_BUF_LEN 1024
+#define LIST_ARRAY_LEN 8
+#define ATTR_BUF_LEN 1024
+
+#define ARRAY_ADD(array, pos, len, obj) if(pos >= len) { \
+ len *= 2; \
+ array = realloc(array, len * sizeof(char*)); \
+ } \
+ array[pos] = obj; \
+ pos++;
+
+
+#ifdef __linux__
+#define XATTR_SUPPORTED
+#include <sys/xattr.h>
+
+static char ** parse_xattrlist(char *buf, ssize_t length, ssize_t *nelm) {
+ size_t arraylen = LIST_ARRAY_LEN;
+ size_t arraypos = 0;
+ char **array = malloc(LIST_ARRAY_LEN * sizeof(char*));
+
+ char *begin = buf;
+ char *name = NULL;
+ for(int i=0;i<length;i++) {
+ if(!name && buf[i] == '.') {
+ int nslen = (buf+i-begin);
+ //printf("%.*s\n", nslen, begin);
+ name = buf + i + 1;
+ }
+ if(buf[i] == '\0') {
+ char *attrname = strdup(name);
+ ARRAY_ADD(array, arraypos, arraylen, attrname);
+ begin = buf + i + 1;
+ name = 0;
+ }
+ }
+
+ if(arraypos == 0) {
+ free(array);
+ array = NULL;
+ }
+
+ *nelm = arraypos;
+ return array;
+}
+
+char ** xattr_list(const char *path, ssize_t *nelm) {
+ char *list = malloc(LIST_BUF_LEN);
+ ssize_t len = listxattr(path, list, LIST_BUF_LEN);
+ if(len == -1) {
+ switch(errno) {
+ case ERANGE: {
+ // buffer too, get size of attribute list
+ ssize_t newlen = listxattr(path, NULL, 0);
+ if(newlen > 0) {
+ // second try
+ list = realloc(list, newlen);
+ len = listxattr(path, list, newlen);
+ if(len != -1) {
+ // this time it worked
+ break;
+ }
+ }
+ }
+ default: {
+ free(list);
+ *nelm = -1;
+ return NULL;
+ }
+ }
+ }
+
+ char **ret = parse_xattrlist(list, len, nelm);
+ free(list);
+ return ret;
+}
+
+static char* name2nsname(const char *name) {
+ // add the 'user' namespace to the name
+ size_t namelen = strlen(name);
+ char *attrname = malloc(8 + namelen);
+ memcpy(attrname, "user.", 5);
+ memcpy(attrname+5, name, namelen + 1);
+ return attrname;
+}
+
+char * xattr_get(const char *path, const char *attr, ssize_t *len) {
+ char *attrname = name2nsname(attr);
+
+ char *buf = malloc(ATTR_BUF_LEN);
+ ssize_t vlen = getxattr(path, attrname, buf, ATTR_BUF_LEN);
+ if(vlen < 0) {
+ switch(errno) {
+ case ERANGE: {
+ ssize_t attrlen = getxattr(path, attrname, NULL, 0);
+ if(attrlen > 0) {
+ free(buf);
+ buf = malloc(attrlen);
+ vlen = getxattr(path, attrname, buf, attrlen);
+ if(vlen > 0) {
+ break;
+ }
+ }
+ }
+ default: {
+ *len = -1;
+ free(buf);
+ free(attrname);
+ return NULL;
+ }
+ }
+ }
+
+ free(attrname);
+ *len = vlen;
+ return buf;
+}
+
+int xattr_set(const char *path, const char *name, const void *value, size_t len) {
+ char *attrname = name2nsname(name);
+ int ret = setxattr(path, attrname, value, len, 0);
+ free(attrname);
+ return ret;
+}
+
+#endif /* Linux */
+
+#ifdef __APPLE__
+#define XATTR_SUPPORTED
+#include <sys/xattr.h>
+
+static char ** parse_xattrlist(char *buf, ssize_t length, ssize_t *nelm) {
+ size_t arraylen = LIST_ARRAY_LEN;
+ size_t arraypos = 0;
+ char **array = malloc(LIST_ARRAY_LEN * sizeof(char*));
+
+ char *name = buf;
+ for(int i=0;i<length;i++) {
+ if(buf[i] == '\0') {
+ char *attrname = strdup(name);
+ ARRAY_ADD(array, arraypos, arraylen, attrname);
+ name = buf + i + 1;
+ }
+ }
+
+ if(arraypos == 0) {
+ free(array);
+ array = NULL;
+ }
+
+ *nelm = arraypos;
+ return array;
+}
+
+char ** xattr_list(const char *path, ssize_t *nelm) {
+ char *list = malloc(LIST_BUF_LEN);
+ ssize_t len = listxattr(path, list, LIST_BUF_LEN, 0);
+ if(len == -1) {
+ switch(errno) {
+ case ERANGE: {
+ // buffer too, get size of attribute list
+ ssize_t newlen = listxattr(path, NULL, 0, 0);
+ if(newlen > 0) {
+ // second try
+ list = realloc(list, newlen);
+ len = listxattr(path, list, newlen, 0);
+ if(len != -1) {
+ // this time it worked
+ break;
+ }
+ }
+ }
+ default: {
+ free(list);
+ *nelm = -1;
+ return NULL;
+ }
+ }
+ }
+
+ char **ret = parse_xattrlist(list, len, nelm);
+ free(list);
+ return ret;
+}
+
+char * xattr_get(const char *path, const char *attr, ssize_t *len) {
+ // get attribute length
+ ssize_t attrlen = getxattr(path, attr, NULL, 0, 0, 0);
+ if(attrlen < 0) {
+ *len = -1;
+ return NULL;
+ }
+
+ char *buf = malloc(attrlen);
+ ssize_t vlen = getxattr(path, attr, buf, attrlen, 0, 0);
+ if(vlen < 0) {
+ *len = -1;
+ free(buf);
+ return NULL;
+ }
+
+ *len = vlen;
+ return buf;
+}
+
+int xattr_set(const char *path, const char *name, const void *value, size_t len) {
+ int ret = setxattr(path, name, value, len, 0, 0);
+ return ret;
+}
+
+#endif /* Apple */
+
+#ifdef __sun
+#define XATTR_SUPPORTED
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <fcntl.h>
+
+static int open_attrfile(const char *path, const char *attr, int oflag) {
+ int file = open(path, O_RDONLY);
+ if(file == -1) {
+ return -1;
+ }
+
+ int attrfile = openat(file, attr, oflag, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
+ close(file);
+ return attrfile;
+}
+
+char ** xattr_list(const char *path, ssize_t *nelm) {
+ *nelm = -1;
+
+ int attrdir = open_attrfile(path, ".", O_RDONLY|O_XATTR);
+ if(attrdir == -1) {
+ return NULL;
+ }
+
+ DIR *dir = fdopendir(attrdir);
+ if(!dir) {
+ close(attrdir);
+ return NULL;
+ }
+
+ size_t arraylen = LIST_ARRAY_LEN;
+ size_t arraypos = 0;
+ char **array = malloc(LIST_ARRAY_LEN * sizeof(char*));
+
+ struct dirent *ent;
+ while((ent = readdir(dir)) != NULL) {
+ if(!strcmp(ent->d_name, ".") || !strcmp(ent->d_name, "..") || !strcmp(ent->d_name, "SUNWattr_ro") || !strcmp(ent->d_name, "SUNWattr_rw")) {
+ continue;
+ }
+ char *name = strdup(ent->d_name);
+ ARRAY_ADD(array, arraypos, arraylen, name);
+ }
+ closedir(dir);
+
+ *nelm = arraypos;
+ return array;
+}
+
+char * xattr_get(const char *path, const char *attr, ssize_t *len) {
+ *len = -1;
+
+ int attrfile = open_attrfile(path, attr, O_RDONLY|O_XATTR);
+ if(attrfile == -1) {
+ return NULL;
+ }
+
+ struct stat s;
+ if(fstat(attrfile, &s)) {
+ close(attrfile);
+ return NULL;
+ }
+
+ size_t bufsize = (size_t)s.st_size;
+ char *buf = malloc(bufsize);
+
+ char *b = buf;
+ size_t cur = 0;
+ while(cur < bufsize) {
+ ssize_t r = read(attrfile, buf + cur, bufsize - cur);
+ if(r <= 0) {
+ break;
+ }
+ cur += r;
+ }
+
+ close(attrfile);
+ if(cur != bufsize) {
+ free(buf);
+ return NULL;
+ }
+
+ *len = (ssize_t)bufsize;
+ return buf;
+}
+
+int xattr_set(const char *path, const char *name, const void *value, size_t len) {
+ int attrfile = open_attrfile(path, name, O_CREAT|O_WRONLY|O_XATTR);
+ if(attrfile == -1) {
+ return -1;
+ }
+
+ const char *p = value;
+ size_t remaining = len;
+ while(remaining > 0) {
+ ssize_t w = write(attrfile, p, remaining);
+ if(w <= 0) {
+ break;
+ }
+ p += w;
+ remaining -= w;
+ }
+
+ close(attrfile);
+
+ return remaining > 0 ? -1 : 0;
+}
+
+#endif /* Sun */
+
+
+#ifdef __FreeBSD__
+#define XATTR_SUPPORTED
+
+#include <sys/types.h>
+#include <sys/extattr.h>
+
+static char ** parse_xattrlist(char *buf, ssize_t length, ssize_t *nelm) {
+ size_t arraylen = LIST_ARRAY_LEN;
+ size_t arraypos = 0;
+ char **array = malloc(LIST_ARRAY_LEN * sizeof(char*));
+
+ char *name = buf;
+ for(int i=0;i<length;i++) {
+ char namelen = buf[i];
+ char *name = buf + i + 1;
+ char *attrname = malloc(namelen + 1);
+ memcpy(attrname, name, namelen);
+ attrname[namelen] = 0;
+ ARRAY_ADD(array, arraypos, arraylen, attrname);
+ i += namelen;
+ }
+
+ if(arraypos == 0) {
+ free(array);
+ array = NULL;
+ }
+
+ *nelm = arraypos;
+ return array;
+}
+
+char ** xattr_list(const char *path, ssize_t *nelm) {
+ *nelm = -1;
+ ssize_t lslen = extattr_list_file(path, EXTATTR_NAMESPACE_USER, NULL, 0);
+ if(lslen <= 0) {
+ if(lslen == 0) {
+ *nelm = 0;
+ }
+ return NULL;
+ }
+
+ char *list = malloc(lslen);
+ ssize_t len = extattr_list_file(path, EXTATTR_NAMESPACE_USER, list, lslen);
+ if(len == -1) {
+ free(list);
+ return NULL;
+ }
+
+ char **ret = parse_xattrlist(list, len, nelm);
+ free(list);
+ return ret;
+}
+
+char * xattr_get(const char *path, const char *attr, ssize_t *len) {
+ // get attribute length
+ ssize_t attrlen = extattr_get_file(path, EXTATTR_NAMESPACE_USER, attr, NULL, 0);
+ if(attrlen < 0) {
+ *len = -1;
+ return NULL;
+ }
+
+ char *buf = malloc(attrlen);
+ ssize_t vlen = extattr_get_file(path, EXTATTR_NAMESPACE_USER, attr, buf, attrlen);
+ if(vlen < 0) {
+ *len = -1;
+ free(buf);
+ return NULL;
+ }
+
+ *len = vlen;
+ return buf;
+}
+
+int xattr_set(const char *path, const char *name, const void *value, size_t len) {
+ int ret = extattr_set_file(path, EXTATTR_NAMESPACE_USER, name, value, len);
+ return ret;
+}
+
+#endif /* FreeBSD */
+
+
+#ifndef XATTR_SUPPORTED
+
+char ** xattr_list(const char *path, ssize_t *nelm) {
+ *nelm = -1;
+ return NULL;
+}
+
+char * xattr_get(const char *path, const char *attr, ssize_t *len) {
+ *len = -1;
+ return NULL;
+}
+
+int xattr_set(const char *path, const char *name, const void *value, size_t len) {
+ return -1;
+}
+
+#endif /* unsupported platform */
+
+void xattr_free_list(char **attrnames, ssize_t nelm) {
+ if(attrnames) {
+ for(int i=0;i<nelm;i++) {
+ free(attrnames[i]);
+ }
+ free(attrnames);
+ }
+}