APLOG_USE_MODULE(http);
+typedef struct indexes_t {
+ apr_off_t start;
+ apr_off_t end;
+} indexes_t;
+
+/*
+ * Returns: number of ranges (merged) or -1 for no-good
+ */
static int ap_set_byterange(request_rec *r, apr_off_t clength,
- apr_array_header_t **indexes);
+ apr_array_header_t **indexes)
+{
+ const char *range;
+ const char *if_range;
+ const char *match;
+ const char *ct;
+ char *cur, **new;
+ apr_array_header_t *merged;
+ int num_ranges = 0, unsatisfiable = 0;
+ apr_off_t ostart = 0, oend = 0, sum_lengths = 0;
+ int in_merge = 0;
+ indexes_t *idx;
+ int overlaps = 0, reversals = 0;
+ int ranges = 1;
+ const char *it;
+
+ if (r->assbackwards) {
+ return 0;
+ }
+
+ /*
+ * Check for Range request-header (HTTP/1.1) or Request-Range for
+ * backwards-compatibility with second-draft Luotonen/Franks
+ * byte-ranges (e.g. Netscape Navigator 2-3).
+ *
+ * We support this form, with Request-Range, and (farther down) we
+ * send multipart/x-byteranges instead of multipart/byteranges for
+ * Request-Range based requests to work around a bug in Netscape
+ * Navigator 2-3 and MSIE 3.
+ */
+
+ if (!(range = apr_table_get(r->headers_in, "Range"))) {
+ range = apr_table_get(r->headers_in, "Request-Range");
+ }
+
+ if (!range || strncasecmp(range, "bytes=", 6) || r->status != HTTP_OK) {
+ return 0;
+ }
+
+ /* is content already a single range? */
+ if (apr_table_get(r->headers_out, "Content-Range")) {
+ return 0;
+ }
+
+ /* is content already a multiple range? */
+ if ((ct = apr_table_get(r->headers_out, "Content-Type"))
+ && (!strncasecmp(ct, "multipart/byteranges", 20)
+ || !strncasecmp(ct, "multipart/x-byteranges", 22))) {
+ return 0;
+ }
+
+ /*
+ * Check the If-Range header for Etag or Date.
+ * Note that this check will return false (as required) if either
+ * of the two etags are weak.
+ */
+ if ((if_range = apr_table_get(r->headers_in, "If-Range"))) {
+ if (if_range[0] == '"') {
+ if (!(match = apr_table_get(r->headers_out, "Etag"))
+ || (strcmp(if_range, match) != 0)) {
+ return 0;
+ }
+ }
+ else if (!(match = apr_table_get(r->headers_out, "Last-Modified"))
+ || (strcmp(if_range, match) != 0)) {
+ return 0;
+ }
+ }
+
+ range += 6;
+ it = range;
+ while (*it) {
+ if (*it++ == ',') {
+ ranges++;
+ }
+ }
+ it = range;
+ if (ranges > MAX_PREALLOC_RANGES) {
+ ranges = MAX_PREALLOC_RANGES;
+ }
+ *indexes = apr_array_make(r->pool, ranges, sizeof(indexes_t));
+ merged = apr_array_make(r->pool, ranges, sizeof(char *));
+ while ((cur = ap_getword(r->pool, &range, ','))) {
+ char *dash;
+ char *errp;
+ apr_off_t number, start, end;
+
+ if (!*cur)
+ break;
+
+ /*
+ * Per RFC 2616 14.35.1: If there is at least one syntactically invalid
+ * byte-range-spec, we must ignore the whole header.
+ */
+
+ if (!(dash = strchr(cur, '-'))) {
+ return 0;
+ }
+
+ if (dash == cur) {
+ /* In the form "-5" */
+ if (apr_strtoff(&number, dash+1, &errp, 10) || *errp) {
+ return 0;
+ }
+ if (number < 1) {
+ return 0;
+ }
+ start = clength - number;
+ end = clength - 1;
+ }
+ else {
+ *dash++ = '\0';
+ if (apr_strtoff(&number, cur, &errp, 10) || *errp) {
+ return 0;
+ }
+ start = number;
+ if (*dash) {
+ if (apr_strtoff(&number, dash, &errp, 10) || *errp) {
+ return 0;
+ }
+ end = number;
+ if (start > end) {
+ return 0;
+ }
+ }
+ else { /* "5-" */
+ end = clength - 1;
+ }
+ }
+
+ if (start < 0) {
+ start = 0;
+ }
+ if (start >= clength) {
+ unsatisfiable = 1;
+ continue;
+ }
+ if (end >= clength) {
+ end = clength - 1;
+ }
+
+ if (!in_merge) {
+ /* new set */
+ ostart = start;
+ oend = end;
+ in_merge = 1;
+ continue;
+ }
+ in_merge = 0;
+
+ if (start >= ostart && end <= oend) {
+ in_merge = 1;
+ }
+
+ if (start < ostart && end >= ostart-1) {
+ ostart = start;
+ reversals++;
+ in_merge = 1;
+ }
+ if (end >= oend && start <= oend+1 ) {
+ oend = end;
+ in_merge = 1;
+ }
+
+ if (in_merge) {
+ overlaps++;
+ continue;
+ } else {
+ new = (char **)apr_array_push(merged);
+ *new = apr_psprintf(r->pool, "%" APR_OFF_T_FMT "-%" APR_OFF_T_FMT,
+ ostart, oend);
+ idx = (indexes_t *)apr_array_push(*indexes);
+ idx->start = ostart;
+ idx->end = oend;
+ sum_lengths += oend - ostart + 1;
+ /* new set again */
+ in_merge = 1;
+ ostart = start;
+ oend = end;
+ num_ranges++;
+ }
+ }
+
+ if (in_merge) {
+ new = (char **)apr_array_push(merged);
+ *new = apr_psprintf(r->pool, "%" APR_OFF_T_FMT "-%" APR_OFF_T_FMT,
+ ostart, oend);
+ idx = (indexes_t *)apr_array_push(*indexes);
+ idx->start = ostart;
+ idx->end = oend;
+ sum_lengths += oend - ostart + 1;
+ num_ranges++;
+ }
+ else if (num_ranges == 0 && unsatisfiable) {
+ /* If all ranges are unsatisfiable, we should return 416 */
+ return -1;
+ }
+ if (sum_lengths >= clength) {
+ ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r,
+ "Sum of ranges not smaller than file, ignoring.");
+ return 0;
+ }
+
+ r->status = HTTP_PARTIAL_CONTENT;
+ r->range = apr_array_pstrcat(r->pool, merged, ',');
+ ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "Range: %s | %s (%d : %d : %"APR_OFF_T_FMT")",
+ it, r->range, overlaps, reversals, clength);
+
+ return num_ranges;
+}
/*
* Here we try to be compatible with clients that want multipart/x-byteranges
return APR_SUCCESS;
}
-typedef struct indexes_t {
- apr_off_t start;
- apr_off_t end;
-} indexes_t;
-
static int get_max_ranges(request_rec *r) {
core_dir_config *core_conf = ap_get_core_module_config(r->per_dir_config);
if (core_conf->max_ranges >= 0 || core_conf->max_ranges == AP_MAXRANGES_UNLIMITED) {
/* send our multipart output */
return ap_pass_brigade(f->next, bsend);
}
-
-static int ap_set_byterange(request_rec *r, apr_off_t clength,
- apr_array_header_t **indexes)
-{
- const char *range;
- const char *if_range;
- const char *match;
- const char *ct;
- char *cur, **new;
- apr_array_header_t *merged;
- int num_ranges = 0, unsatisfiable = 0;
- apr_off_t ostart = 0, oend = 0, sum_lengths = 0;
- int in_merge = 0;
- indexes_t *idx;
- int overlaps = 0, reversals = 0;
- int ranges = 1;
- const char *it;
-
- if (r->assbackwards) {
- return 0;
- }
-
- /*
- * Check for Range request-header (HTTP/1.1) or Request-Range for
- * backwards-compatibility with second-draft Luotonen/Franks
- * byte-ranges (e.g. Netscape Navigator 2-3).
- *
- * We support this form, with Request-Range, and (farther down) we
- * send multipart/x-byteranges instead of multipart/byteranges for
- * Request-Range based requests to work around a bug in Netscape
- * Navigator 2-3 and MSIE 3.
- */
-
- if (!(range = apr_table_get(r->headers_in, "Range"))) {
- range = apr_table_get(r->headers_in, "Request-Range");
- }
-
- if (!range || strncasecmp(range, "bytes=", 6) || r->status != HTTP_OK) {
- return 0;
- }
-
- /* is content already a single range? */
- if (apr_table_get(r->headers_out, "Content-Range")) {
- return 0;
- }
-
- /* is content already a multiple range? */
- if ((ct = apr_table_get(r->headers_out, "Content-Type"))
- && (!strncasecmp(ct, "multipart/byteranges", 20)
- || !strncasecmp(ct, "multipart/x-byteranges", 22))) {
- return 0;
- }
-
- /*
- * Check the If-Range header for Etag or Date.
- * Note that this check will return false (as required) if either
- * of the two etags are weak.
- */
- if ((if_range = apr_table_get(r->headers_in, "If-Range"))) {
- if (if_range[0] == '"') {
- if (!(match = apr_table_get(r->headers_out, "Etag"))
- || (strcmp(if_range, match) != 0)) {
- return 0;
- }
- }
- else if (!(match = apr_table_get(r->headers_out, "Last-Modified"))
- || (strcmp(if_range, match) != 0)) {
- return 0;
- }
- }
-
- range += 6;
- it = range;
- while (*it) {
- if (*it++ == ',') {
- ranges++;
- }
- }
- it = range;
- if (ranges > MAX_PREALLOC_RANGES) {
- ranges = MAX_PREALLOC_RANGES;
- }
- *indexes = apr_array_make(r->pool, ranges, sizeof(indexes_t));
- merged = apr_array_make(r->pool, ranges, sizeof(char *));
- while ((cur = ap_getword(r->pool, &range, ','))) {
- char *dash;
- char *errp;
- apr_off_t number, start, end;
-
- if (!*cur)
- break;
-
- /*
- * Per RFC 2616 14.35.1: If there is at least one syntactically invalid
- * byte-range-spec, we must ignore the whole header.
- */
-
- if (!(dash = strchr(cur, '-'))) {
- return 0;
- }
-
- if (dash == cur) {
- /* In the form "-5" */
- if (apr_strtoff(&number, dash+1, &errp, 10) || *errp) {
- return 0;
- }
- if (number < 1) {
- return 0;
- }
- start = clength - number;
- end = clength - 1;
- }
- else {
- *dash++ = '\0';
- if (apr_strtoff(&number, cur, &errp, 10) || *errp) {
- return 0;
- }
- start = number;
- if (*dash) {
- if (apr_strtoff(&number, dash, &errp, 10) || *errp) {
- return 0;
- }
- end = number;
- if (start > end) {
- return 0;
- }
- }
- else { /* "5-" */
- end = clength - 1;
- }
- }
-
- if (start < 0) {
- start = 0;
- }
- if (start >= clength) {
- unsatisfiable = 1;
- continue;
- }
- if (end >= clength) {
- end = clength - 1;
- }
-
- if (!in_merge) {
- /* new set */
- ostart = start;
- oend = end;
- in_merge = 1;
- continue;
- }
- in_merge = 0;
-
- if (start >= ostart && end <= oend) {
- in_merge = 1;
- }
-
- if (start < ostart && end >= ostart-1) {
- ostart = start;
- reversals++;
- in_merge = 1;
- }
- if (end >= oend && start <= oend+1 ) {
- oend = end;
- in_merge = 1;
- }
-
- if (in_merge) {
- overlaps++;
- continue;
- } else {
- new = (char **)apr_array_push(merged);
- *new = apr_psprintf(r->pool, "%" APR_OFF_T_FMT "-%" APR_OFF_T_FMT,
- ostart, oend);
- idx = (indexes_t *)apr_array_push(*indexes);
- idx->start = ostart;
- idx->end = oend;
- sum_lengths += oend - ostart + 1;
- /* new set again */
- in_merge = 1;
- ostart = start;
- oend = end;
- num_ranges++;
- }
- }
-
- if (in_merge) {
- new = (char **)apr_array_push(merged);
- *new = apr_psprintf(r->pool, "%" APR_OFF_T_FMT "-%" APR_OFF_T_FMT,
- ostart, oend);
- idx = (indexes_t *)apr_array_push(*indexes);
- idx->start = ostart;
- idx->end = oend;
- sum_lengths += oend - ostart + 1;
- num_ranges++;
- }
- else if (num_ranges == 0 && unsatisfiable) {
- /* If all ranges are unsatisfiable, we should return 416 */
- return -1;
- }
- if (sum_lengths >= clength) {
- ap_log_rerror(APLOG_MARK, APLOG_TRACE1, 0, r,
- "Sum of ranges not smaller than file, ignoring.");
- return 0;
- }
-
- r->status = HTTP_PARTIAL_CONTENT;
- r->range = apr_array_pstrcat(r->pool, merged, ',');
- ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
- "Range: %s | %s (%d : %d : %"APR_OFF_T_FMT")",
- it, r->range, overlaps, reversals, clength);
-
- return num_ranges;
-}
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