lighttpd 1.4.x
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92 lines
2.5 KiB
92 lines
2.5 KiB
/*
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* http_etag - HTTP ETag manipulation
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*
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* Copyright(c) 2015,2020 Glenn Strauss gstrauss()gluelogic.com All rights reserved
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* License: BSD 3-clause (same as lighttpd)
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*/
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#include "first.h"
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#include "http_etag.h"
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#include <sys/stat.h>
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#include <string.h>
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#include "algo_md.h"
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#include "buffer.h"
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int
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http_etag_matches (const buffer * const etag, const char *s, const int weak_ok)
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{
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if ('*' == s[0] && '\0' == s[1]) return 1;
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if (buffer_is_blank(etag)) return 0;
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uint32_t etag_sz = buffer_clen(etag);
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const char *etag_ptr = etag->ptr;
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if (etag_ptr[0] == 'W' && etag_ptr[1] == '/') {
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if (!weak_ok) return 0;
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etag_ptr += 2;
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etag_sz -= 2;
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}
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while (*s) {
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while (*s == ' ' || *s == '\t' || *s == ',') ++s;
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if (s[0] == 'W' && s[1] == '/' ? (s+=2, weak_ok) : 1) {
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if (0 == strncmp(s, etag_ptr, etag_sz) || *s == '*') {
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s += (*s != '*' ? etag_sz : 1);
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if (*s == '\0' || *s == ' ' || *s == '\t' || *s == ',')
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return 1;
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}
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}
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while (*s != '\0' && *s != ',') ++s;
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}
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return 0;
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}
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static void
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http_etag_remix (buffer * const etag, const char * const str, const uint32_t len)
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{
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uint32_t h = dekhash(str, len, len); /*(pass len as initial hash value)*/
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#if 0 /*(currently never elen > 2; always cleared in http_etag_create())*/
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uint32_t elen = buffer_clen(etag);
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if (elen > 2) {/*(expect "..." if set)*/
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h = dekhash(etag->ptr+1, elen-2, h);
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buffer_truncate(etag, 1);
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}
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else
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buffer_copy_string_len(etag, CONST_STR_LEN("\""));
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#else
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buffer_copy_string_len(etag, CONST_STR_LEN("\""));
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#endif
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buffer_append_int(etag, h);
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buffer_append_string_len(etag, CONST_STR_LEN("\""));
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}
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void
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http_etag_create (buffer * const etag, const struct stat * const st, const int flags)
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{
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if (0 == flags) return;
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uint64_t x[4];
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uint32_t len = 0;
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if (flags & ETAG_USE_INODE)
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x[len++] = (uint64_t)st->st_ino;
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if (flags & ETAG_USE_SIZE)
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x[len++] = (uint64_t)st->st_size;
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if (flags & ETAG_USE_MTIME) {
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x[len++] = (uint64_t)st->st_mtime;
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#ifdef st_mtime /* use high-precision timestamp if available */
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#if defined(__APPLE__) && defined(__MACH__)
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x[len++] = (uint64_t)st->st_mtimespec.tv_nsec;
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#else
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x[len++] = (uint64_t)st->st_mtim.tv_nsec;
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#endif
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#endif
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}
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buffer_clear(etag);
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http_etag_remix(etag, (char *)x, len << 3);
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}
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