X-Git-Url: https://arthur.barton.de/gitweb/?a=blobdiff_plain;f=libatalk%2Fadouble%2Fad_open.c;h=14f2caa4b87721ec02f34e47765b9e22e466bec9;hb=3988114e763aceb0d06ffb9a64549dec5a9500ff;hp=4e1253d1febf6e70b8cef6576b54b98015385eb9;hpb=5ec122952ff5835479f7441291dc8fdbb7796de1;p=netatalk.git

diff --git a/libatalk/adouble/ad_open.c b/libatalk/adouble/ad_open.c
index 4e1253d1..14f2caa4 100644
--- a/libatalk/adouble/ad_open.c
+++ b/libatalk/adouble/ad_open.c
@@ -311,19 +311,16 @@ static uint32_t get_eid(uint32_t eid)
     return 0;
 }
 
-/* ----------------------------------- */
-static int new_ad_header(struct adouble *ad, const char *path, struct stat *stp, int adflags)
+
+/**
+ * Initialize offset pointers
+ */
+int ad_init_offsets(struct adouble *ad)
 {
     const struct entry  *eid;
-    uint16_t            ashort;
-    struct stat         st;
-
-    LOG(log_debug, logtype_ad, "new_ad_header(\"%s\")", path);
 
-    if (ad->ad_magic == AD_MAGIC) {
-        LOG(log_debug, logtype_ad, "new_ad_header(\"%s\"): already initialized", path);
+    if (ad->ad_magic == AD_MAGIC)
         return 0;
-    }
 
     ad->ad_magic = AD_MAGIC;
     ad->ad_version = ad->ad_vers & 0x0f0000;
@@ -346,22 +343,24 @@ static int new_ad_header(struct adouble *ad, const char *path, struct stat *stp,
         eid++;
     }
 
-    /* put something sane in the directory finderinfo */
-    if (stp == NULL) {
-        stp = &st;
-        if (lstat(path, &st) != 0)
-            return -1;
-    }
+    return 0;
+}
 
-    if ((adflags & ADFLAGS_DIR)) {
-        /* set default view */
-        ashort = htons(FINDERINFO_CLOSEDVIEW);
-        memcpy(ad_entry(ad, ADEID_FINDERI) + FINDERINFO_FRVIEWOFF, &ashort, sizeof(ashort));
-    } else {
-        /* set default creator/type fields */
-        memcpy(ad_entry(ad, ADEID_FINDERI) + FINDERINFO_FRTYPEOFF,"\0\0\0\0", 4);
-        memcpy(ad_entry(ad, ADEID_FINDERI) + FINDERINFO_FRCREATOFF,"\0\0\0\0", 4);
-    }
+/* ----------------------------------- */
+static int new_ad_header(struct adouble *ad, const char *path, struct stat *stp, int adflags)
+{
+    const struct entry  *eid;
+    uint16_t            ashort;
+    struct stat         st;
+
+    LOG(log_debug, logtype_ad, "new_ad_header(\"%s\")", path);
+
+    if (ad_init_offsets(ad) != 0)
+        return -1;
+
+    /* set default creator/type fields */
+    memcpy(ad_entry(ad, ADEID_FINDERI) + FINDERINFO_FRTYPEOFF,"\0\0\0\0", 4);
+    memcpy(ad_entry(ad, ADEID_FINDERI) + FINDERINFO_FRCREATOFF,"\0\0\0\0", 4);
 
     /* make things invisible */
     if ((ad->ad_options & ADVOL_INVDOTS)
@@ -375,6 +374,11 @@ static int new_ad_header(struct adouble *ad, const char *path, struct stat *stp,
     }
 
     /* put something sane in the date fields */
+    if (stp == NULL) {
+        stp = &st;
+        if (lstat(path, &st) != 0)
+            return -1;
+    }
     ad_setdate(ad, AD_DATE_CREATE | AD_DATE_UNIX, stp->st_mtime);
     ad_setdate(ad, AD_DATE_MODIFY | AD_DATE_UNIX, stp->st_mtime);
     ad_setdate(ad, AD_DATE_ACCESS | AD_DATE_UNIX, stp->st_mtime);
@@ -383,13 +387,13 @@ static int new_ad_header(struct adouble *ad, const char *path, struct stat *stp,
     return 0;
 }
 
-/* -------------------------------------
-   read in the entries
-*/
-static void parse_entries(struct adouble *ad, char *buf, uint16_t nentries)
+/**
+ * Read an AppleDouble buffer, returns 0 on success, -1 if an entry was malformatted
+ **/
+static int parse_entries(struct adouble *ad, char *buf, uint16_t nentries)
 {
     uint32_t   eid, len, off;
-    int        warning = 0;
+    int        ret = 0;
 
     /* now, read in the entry bits */
     for (; nentries > 0; nentries-- ) {
@@ -403,17 +407,21 @@ static void parse_entries(struct adouble *ad, char *buf, uint16_t nentries)
         len = ntohl( len );
         buf += sizeof( len );
 
-        if (eid
-            && eid < ADEID_MAX
-            && off < sizeof(ad->ad_data)
-            && (off + len <= sizeof(ad->ad_data) || eid == ADEID_RFORK)) {
-            ad->ad_eid[ eid ].ade_off = off;
-            ad->ad_eid[ eid ].ade_len = len;
-        } else if (!warning) {
-            warning = 1;
-            LOG(log_warning, logtype_ad, "parse_entries: bogus eid: %d", eid);
+        ad->ad_eid[eid].ade_off = off;
+        ad->ad_eid[eid].ade_len = len;
+
+        if (!eid
+            || eid > ADEID_MAX
+            || off >= sizeof(ad->ad_data)
+            || ((eid != ADEID_RFORK) && (off + len >  sizeof(ad->ad_data))))
+        {
+            ret = -1;
+            LOG(log_warning, logtype_ad, "parse_entries: bogus eid: %u, off: %u, len: %u",
+                (uint)eid, (uint)off, (uint)len);
         }
     }
+
+    return ret;
 }
 
 /* this reads enough of the header so that we can figure out all of
@@ -423,7 +431,7 @@ static void parse_entries(struct adouble *ad, char *buf, uint16_t nentries)
  * NOTE: we're assuming that the resource fork is kept at the end of
  *       the file. also, mmapping won't work for the hfs fs until it
  *       understands how to mmap header files. */
-static int ad_header_read(const char *path _U_, struct adouble *ad, const struct stat *hst)
+static int ad_header_read(const char *path, struct adouble *ad, const struct stat *hst)
 {
     char                *buf = ad->ad_data;
     uint16_t            nentries;
@@ -471,7 +479,12 @@ static int ad_header_read(const char *path _U_, struct adouble *ad, const struct
     /* figure out all of the entry offsets and lengths. if we aren't
      * able to read a resource fork entry, bail. */
     nentries = len / AD_ENTRY_LEN;
-    parse_entries(ad, buf, nentries);
+    if (parse_entries(ad, buf, nentries) != 0) {
+        LOG(log_warning, logtype_ad, "ad_header_read(%s): malformed AppleDouble",
+            path ? fullpathname(path) : "");
+        errno = EIO;
+        return -1;
+    }
     if (!ad_getentryoff(ad, ADEID_RFORK)
         || (ad_getentryoff(ad, ADEID_RFORK) > sizeof(ad->ad_data))
         ) {
@@ -527,7 +540,9 @@ int ad_valid_header_osx(const char *path)
         EC_FAIL;
     }
 
-    if (strncmp(buf + ADEDOFF_FILLER, "Mac OS X", strlen("Mac OS X")) == 0)
+    if (strncmp(buf + ADEDOFF_FILLER,
+                AD_FILLER_NETATALK,
+                strlen(AD_FILLER_NETATALK)) != 0)
         /*
          * It's a split fork created by OS X, it's not our "own" ._ file
          * and thus not a valid header in this context.
@@ -544,18 +559,99 @@ EC_CLEANUP:
     return 0;
 }
 
+/**
+ * Convert from Apple's ._ file to Netatalk
+ *
+ * Apple's AppleDouble may contain a FinderInfo entry longer then 32 bytes
+ * containing packed xattrs. Netatalk can't deal with that, so we
+ * simply discard the packed xattrs.
+ *
+ * As we call ad_open() which might result in a recursion, just to be sure
+ * use static variable in_conversion to check for that.
+ *
+ * Returns -1 in case an error occured, 0 if no conversion was done, 1 otherwise
+ **/
+static int ad_convert_osx(const char *path, struct adouble *ad)
+{
+    EC_INIT;
+    static bool in_conversion = false;
+    char *map;
+    int finderlen = ad_getentrylen(ad, ADEID_FINDERI);
+    ssize_t origlen;
+
+    if (in_conversion || finderlen == ADEDLEN_FINDERI)
+        return 0;
+    in_conversion = true;
+
+    LOG(log_debug, logtype_ad, "Converting OS X AppleDouble %s, FinderInfo length: %d",
+        fullpathname(path), finderlen);
+
+    origlen = ad_getentryoff(ad, ADEID_RFORK) + ad_getentrylen(ad, ADEID_RFORK);
+
+    map = mmap(NULL, origlen, PROT_READ | PROT_WRITE, MAP_SHARED, ad_reso_fileno(ad), 0);
+    if (map == MAP_FAILED) {
+        LOG(log_error, logtype_ad, "mmap AppleDouble: %s\n", strerror(errno));
+        EC_FAIL;
+    }
+
+    memmove(map + ad_getentryoff(ad, ADEID_FINDERI) + ADEDLEN_FINDERI,
+            map + ad_getentryoff(ad, ADEID_RFORK),
+            ad_getentrylen(ad, ADEID_RFORK));
+
+    ad_setentrylen(ad, ADEID_FINDERI, ADEDLEN_FINDERI);
+    ad->ad_rlen = ad_getentrylen(ad, ADEID_RFORK);
+    ad_setentryoff(ad, ADEID_RFORK, ad_getentryoff(ad, ADEID_FINDERI) + ADEDLEN_FINDERI);
+
+    EC_ZERO_LOG( ftruncate(ad_reso_fileno(ad),
+                           ad_getentryoff(ad, ADEID_RFORK)
+                           + ad_getentrylen(ad, ADEID_RFORK)) );
+
+    (void)ad_rebuild_adouble_header_osx(ad, map);
+    munmap(map, origlen);
+
+    /* Create a metadata EA if one doesn't exit */
+    if (strlen(path) < 3)
+        EC_EXIT_STATUS(0);
+    struct adouble adea;
+    ad_init_old(&adea, AD_VERSION_EA, ad->ad_options);
+
+    if (ad_open(&adea, path + 2, ADFLAGS_HF | ADFLAGS_RDWR | ADFLAGS_CREATE, 0666) < 0) {
+        LOG(log_error, logtype_ad, "create metadata: %s\n", strerror(errno));
+        EC_FAIL;
+    }
+    if (adea.ad_mdp->adf_flags & O_CREAT) {
+        memcpy(ad_entry(&adea, ADEID_FINDERI),
+               ad_entry(ad, ADEID_FINDERI),
+               ADEDLEN_FINDERI);
+        ad_flush(&adea);
+    }
+    ad_close(&adea, ADFLAGS_HF);
+
+EC_CLEANUP:
+    in_conversion = false;
+    if (ret != 0)
+        return -1;
+    return 1;
+}
+
 /* Read an ._ file, only uses the resofork, finderinfo is taken from EA */
-static int ad_header_read_osx(const char *path _U_, struct adouble *ad, const struct stat *hst)
+static int ad_header_read_osx(const char *path, struct adouble *ad, const struct stat *hst)
 {
     EC_INIT;
     struct adouble      adosx;
-    char                *buf = &adosx.ad_data[0];
+    char                *buf;
     uint16_t            nentries;
     int                 len;
     ssize_t             header_len;
     struct stat         st;
+    int                 retry_read = 0;
 
+reread:
+    LOG(log_debug, logtype_ad, "ad_header_read_osx: %s", path ? fullpathname(path) : "");
+    ad_init_old(&adosx, AD_VERSION_EA, ad->ad_options);
+    buf = &adosx.ad_data[0];
     memset(buf, 0, sizeof(adosx.ad_data));
+    adosx.ad_rfp->adf_fd = ad_reso_fileno(ad);
 
     /* read the header */
     EC_NEG1( header_len = adf_pread(ad->ad_rfp, buf, AD_DATASZ_OSX, 0) );
@@ -591,7 +687,27 @@ static int ad_header_read_osx(const char *path _U_, struct adouble *ad, const st
     }
 
     nentries = len / AD_ENTRY_LEN;
-    parse_entries(&adosx, buf, nentries);
+    if (parse_entries(&adosx, buf, nentries) != 0) {
+        LOG(log_warning, logtype_ad, "ad_header_read(%s): malformed AppleDouble",
+            path ? fullpathname(path) : "");
+    }
+
+    if (ad_getentrylen(&adosx, ADEID_FINDERI) != ADEDLEN_FINDERI) {
+        LOG(log_warning, logtype_ad, "Convert OS X to Netatalk AppleDouble: %s",
+            path ? fullpathname(path) : "");
+
+        if (retry_read > 0) {
+            LOG(log_error, logtype_ad, "ad_header_read_osx: %s, giving up", path ? fullpathname(path) : "");
+            errno = EIO;
+            EC_FAIL;
+        }
+        retry_read++;
+        if (ad_convert_osx(path, &adosx) == 1) {
+            goto reread;
+        }
+        errno = EIO;
+        EC_FAIL;
+    }
 
     if (ad_getentryoff(&adosx, ADEID_RFORK) == 0
         || ad_getentryoff(&adosx, ADEID_RFORK) > sizeof(ad->ad_data)
@@ -616,6 +732,7 @@ EC_CLEANUP:
 
 static int ad_header_read_ea(const char *path, struct adouble *ad, const struct stat *hst _U_)
 {
+    EC_INIT;
     uint16_t nentries;
     int      len;
     ssize_t  header_len;
@@ -624,16 +741,16 @@ static int ad_header_read_ea(const char *path, struct adouble *ad, const struct
     if (ad_meta_fileno(ad) != -1)
         header_len = sys_fgetxattr(ad_meta_fileno(ad), AD_EA_META, ad->ad_data, AD_DATASZ_EA);
     else
-        header_len = sys_lgetxattr(path, AD_EA_META, ad->ad_data, AD_DATASZ_EA);
-     if (header_len < 1) {
+        header_len = sys_getxattr(path, AD_EA_META, ad->ad_data, AD_DATASZ_EA);
+    if (header_len < 1) {
         LOG(log_debug, logtype_ad, "ad_header_read_ea: %s", strerror(errno));
-        return -1;
+        EC_FAIL;
     }
 
-    if (header_len < AD_HEADER_LEN) {
-        LOG(log_error, logtype_ad, "ad_header_read_ea(\"%s\"): bogus AppleDouble header.", fullpathname(path));
-        errno = EIO;
-        return -1;
+    if (header_len < AD_DATASZ_EA) {
+        LOG(log_error, logtype_ad, "ad_header_read_ea(\"%s\"): short metadata EA", fullpathname(path));
+        errno = EINVAL;
+        EC_FAIL;
     }
 
     memcpy(&ad->ad_magic, buf, sizeof( ad->ad_magic ));
@@ -644,28 +761,49 @@ static int ad_header_read_ea(const char *path, struct adouble *ad, const struct
 
     if ((ad->ad_magic != AD_MAGIC) || (ad->ad_version != AD_VERSION2)) {
         LOG(log_error, logtype_ad, "ad_header_read_ea(\"%s\"): wrong magic or version", fullpathname(path));
-        errno = EIO;
-        return -1;
+        errno = EINVAL;
+        EC_FAIL;
     }
 
     memcpy(&nentries, buf + ADEDOFF_NENTRIES, sizeof( nentries ));
     nentries = ntohs( nentries );
-
-    /* Protect against bogus nentries */
-    len = nentries * AD_ENTRY_LEN;
-    if (len + AD_HEADER_LEN > sizeof(ad->ad_data))
-        len = sizeof(ad->ad_data) - AD_HEADER_LEN;
-    if (len > header_len - AD_HEADER_LEN) {
-        LOG(log_error, logtype_ad, "ad_header_read_ea(\"%s\"): can't read entry info.", fullpathname(path));
-        errno = EIO;
-        return -1;
+    if (nentries != ADEID_NUM_EA) {
+        LOG(log_error, logtype_ad, "ad_header_read_ea(\"%s\"): invalid number of entries: %d", fullpathname(path), nentries);
+        errno = EINVAL;
+        EC_FAIL;
     }
-    nentries = len / AD_ENTRY_LEN;
 
     /* Now parse entries */
-    parse_entries(ad, buf + AD_HEADER_LEN, nentries);
+    if (parse_entries(ad, buf + AD_HEADER_LEN, nentries)) {
+        LOG(log_warning, logtype_ad, "ad_header_read(%s): malformed AppleDouble",
+            path ? fullpathname(path) : "");
+        errno = EINVAL;
+        EC_FAIL;
+    }
 
-    return 0;
+    if (nentries != ADEID_NUM_EA
+        || !ad_entry(ad, ADEID_FINDERI)
+        || !ad_entry(ad, ADEID_COMMENT)
+        || !ad_entry(ad, ADEID_FILEDATESI)
+        || !ad_entry(ad, ADEID_AFPFILEI)
+        || !ad_entry(ad, ADEID_PRIVDEV)
+        || !ad_entry(ad, ADEID_PRIVINO)
+        || !ad_entry(ad, ADEID_PRIVSYN)
+        || !ad_entry(ad, ADEID_PRIVID)) {
+        LOG(log_error, logtype_ad, "ad_header_read_ea(\"%s\"): invalid metadata EA", fullpathname(path));
+        errno = EINVAL;
+        EC_FAIL;
+    }
+
+EC_CLEANUP:
+    if (ret != 0 && errno == EINVAL) {
+        become_root();
+        (void)sys_removexattr(path, AD_EA_META);
+        unbecome_root();
+        LOG(log_error, logtype_ad, "ad_header_read_ea(\"%s\"): deleted invalid metadata EA", fullpathname(path), nentries);
+        errno = ENOENT;
+    }
+    EC_EXIT;
 }
 
 /*!
@@ -1131,7 +1269,7 @@ static int ad_open_hf(const char *path, int adflags, int mode, struct adouble *a
 {
     int ret = 0;
 
-    memset(ad->ad_eid, 0, sizeof( ad->ad_eid ));
+    ad->ad_meta_refcount++;
 
     switch (ad->ad_vers) {
     case AD_VERSION2:
@@ -1145,10 +1283,10 @@ static int ad_open_hf(const char *path, int adflags, int mode, struct adouble *a
         break;
     }
 
-    if (ret == 0)
-        ad->ad_meta_refcount++;
-    else
+    if (ret != 0) {
+        ad->ad_meta_refcount--;
         ret = ad_error(ad, adflags);
+    }
 
     return ret;
 }
@@ -1242,6 +1380,7 @@ static int ad_open_rf_ea(const char *path, int adflags, int mode, struct adouble
             EC_FAIL;
         }
         ad->ad_rfp->adf_flags &= ~( O_TRUNC | O_CREAT );
+        ad->ad_reso_refcount++;
         ad->ad_rfp->adf_refcount++;
         EC_NEG1_LOG( ad->ad_rlen = ad_reso_size(path, adflags, ad));
         goto EC_CLEANUP;
@@ -1330,7 +1469,7 @@ static int ad_open_rf_ea(const char *path, int adflags, int mode, struct adouble
         /* Read the adouble header */
         LOG(log_debug, logtype_ad, "ad_open_rf(\"%s\"): reading adouble rfork: \"%s\"",
             path, rfpath);
-        EC_NEG1_LOG( ad_header_read_osx(NULL, ad, &st) );
+        EC_NEG1_LOG( ad_header_read_osx(rfpath, ad, &st) );
     }
 #endif
 
@@ -1397,7 +1536,7 @@ off_t ad_getentryoff(const struct adouble *ad, int eid)
 #ifdef HAVE_EAFD
         return 0;
 #else
-        return ADEDOFF_RFORK_OSX;
+        return ad->ad_eid[eid].ade_off;
 #endif
     default:
         return ad->ad_eid[eid].ade_off;
@@ -1791,7 +1930,7 @@ int ad_metadataat(int dirfd, const char *name, int flags, struct adouble *adp)
     int cwdfd = -1;
 
     if (dirfd != -1) {
-        if ((cwdfd = open(".", O_RDONLY) == -1) || (fchdir(dirfd) != 0)) {
+        if (((cwdfd = open(".", O_RDONLY)) == -1) || (fchdir(dirfd) != 0)) {
             ret = -1;
             goto exit;
         }
@@ -1875,7 +2014,7 @@ int ad_openat(struct adouble  *ad,
     mode_t mode = 0;
 
     if (dirfd != -1) {
-        if ((cwdfd = open(".", O_RDONLY) == -1) || (fchdir(dirfd) != 0))
+        if (((cwdfd = open(".", O_RDONLY)) == -1) || (fchdir(dirfd) != 0))
             EC_FAIL;
     }