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[tor-commits] [tor/maint-0.4.0] In warn_if_nul_found, log surrounding context.
commit 950d890f77d8f060702b100e6075d5083d536577
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date: Mon Apr 15 15:33:09 2019 -0400
In warn_if_nul_found, log surrounding context.
We need to encode here instead of doing escaped(), since fwict
escaped() does not currently handle NUL bytes.
Also, use warn_if_nul_found in more cases to avoid duplication.
---
src/feature/nodelist/microdesc.c | 36 +++++++++++++++++++++---------------
1 file changed, 21 insertions(+), 15 deletions(-)
diff --git a/src/feature/nodelist/microdesc.c b/src/feature/nodelist/microdesc.c
index eaa7f0caf..f4fa8eeae 100644
--- a/src/feature/nodelist/microdesc.c
+++ b/src/feature/nodelist/microdesc.c
@@ -69,6 +69,8 @@ struct microdesc_cache_t {
};
static microdesc_cache_t *get_microdesc_cache_noload(void);
+static void warn_if_nul_found(const char *inp, size_t len, int64_t offset,
+ const char *activity);
/** Helper: computes a hash of <b>md</b> to place it in a hash table. */
static inline unsigned int
@@ -221,14 +223,8 @@ dump_microdescriptor(int fd, microdesc_t *md, size_t *annotation_len_out)
}
md->off = tor_fd_getpos(fd);
- const char *nulpos = memchr(md->body, 0, md->bodylen);
- if (BUG(nulpos)) {
- log_warn(LD_BUG, "About to dump a NUL into a microdescriptor file. "
- "offset %"PRId64", bodylen %"TOR_PRIuSZ", "
- "nul position %"TOR_PRIuSZ".",
- (int64_t)md->off, md->bodylen,
- (size_t)(nulpos - md->body));
- }
+ warn_if_nul_found(md->body, md->bodylen, (int64_t) md->off,
+ "dumping a microdescriptor");
written = write_all_to_fd(fd, md->body, md->bodylen);
if (written != (ssize_t)md->bodylen) {
written = written < 0 ? 0 : written;
@@ -489,13 +485,23 @@ microdesc_cache_clear(microdesc_cache_t *cache)
}
static void
-warn_if_nul_found(const char *inp, size_t len, const char *description)
+warn_if_nul_found(const char *inp, size_t len, int64_t offset,
+ const char *activity)
{
const char *nul_found = memchr(inp, 0, len);
if (BUG(nul_found)) {
- log_warn(LD_BUG, "Found unexpected NUL while reading %s, at "
- "position %"TOR_PRIuSZ"/%"TOR_PRIuSZ".",
- description, (nul_found - inp), len);
+ log_warn(LD_BUG, "Found unexpected NUL while %s, offset %"PRId64
+ "at position %"TOR_PRIuSZ"/%"TOR_PRIuSZ".",
+ activity, offset, (nul_found - inp), len);
+ const char *start_excerpt_at, *eos = inp + len;
+ if ((nul_found - inp) >= 16)
+ start_excerpt_at = nul_found - 16;
+ else
+ start_excerpt_at = inp;
+ size_t excerpt_len = MIN(32, eos - start_excerpt_at);
+ char tmp[65];
+ base16_encode(tmp, sizeof(tmp), start_excerpt_at, excerpt_len);
+ log_warn(LD_BUG, " surrounding string: %s", tmp);
}
}
@@ -516,7 +522,7 @@ microdesc_cache_reload(microdesc_cache_t *cache)
mm = cache->cache_content = tor_mmap_file(cache->cache_fname);
if (mm) {
- warn_if_nul_found(mm->data, mm->size, "microdesc cache");
+ warn_if_nul_found(mm->data, mm->size, 0, "scanning microdesc cache");
added = microdescs_add_to_cache(cache, mm->data, mm->data+mm->size,
SAVED_IN_CACHE, 0, -1, NULL);
if (added) {
@@ -529,8 +535,8 @@ microdesc_cache_reload(microdesc_cache_t *cache)
RFTS_IGNORE_MISSING, &st);
if (journal_content) {
cache->journal_len = (size_t) st.st_size;
- warn_if_nul_found(journal_content, cache->journal_len,
- "microdesc journal");
+ warn_if_nul_found(journal_content, cache->journal_len, 0,
+ "reading microdesc journal");
added = microdescs_add_to_cache(cache, journal_content,
journal_content+st.st_size,
SAVED_IN_JOURNAL, 0, -1, NULL);
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