[PATCH 2/6] msgb: Let msgb_hexdump be more tolerant

This patch makes msgb_hexdump accept out of range lXh pointers and shows info about them instead of aborting the dump entirely. Sponsored-by: On-Waves ehf --- src/msgb.c | 46 +++++++++++++++++++++++++++++++++++++++------- 1 file changed, 39 insertions(+), 7 deletions(-) diff --git a/src/msgb.c b/src/msgb.c index a257479..d896b53 100644 --- a/src/msgb.c +++ b/src/msgb.c @@ -263,10 +263,25 @@ const char *msgb_hexdump(const struct msgb *msg) if (!lxhs[i]) continue; - if (lxhs[i] < msg->data) - goto out_of_range; + if (lxhs[i] < msg->head) + continue; + if (lxhs[i] > msg->head + msg->data_len) + continue; if (lxhs[i] > msg->tail) - goto out_of_range; + continue; + if (lxhs[i] < msg->data || lxhs[i] > msg->tail) { + nchars = snprintf(buf + buf_offs, sizeof(buf) - buf_offs, + "(L%d=data%+d) ", + i+1, lxhs[i] - msg->data); + buf_offs += nchars; + continue; + } + if (lxhs[i] < start) { + nchars = snprintf(buf + buf_offs, sizeof(buf) - buf_offs, + "(L%d%+d) ", i+1, start - lxhs[i]); + buf_offs += nchars; + continue; + } nchars = snprintf(buf + buf_offs, sizeof(buf) - buf_offs, "%s[L%d]> ", osmo_hexdump(start, lxhs[i] - start), @@ -282,11 +297,28 @@ const char *msgb_hexdump(const struct msgb *msg) if (nchars < 0 || nchars + buf_offs >= sizeof(buf)) return "ERROR"; - return buf; + buf_offs += nchars; + + for (i = 0; i < ARRAY_SIZE(lxhs); i++) { + if (!lxhs[i]) + continue; + + if (lxhs[i] < msg->head || lxhs[i] > msg->head + msg->data_len) { + nchars = snprintf(buf + buf_offs, sizeof(buf) - buf_offs, + "(L%d out of range) ", i+1); + } else if (lxhs[i] <= msg->data + msg->data_len && + lxhs[i] > msg->tail) { + nchars = snprintf(buf + buf_offs, sizeof(buf) - buf_offs, + "(L%d=tail%+d) ", + i+1, lxhs[i] - msg->tail); + } else + continue; + + if (nchars < 0 || nchars + buf_offs >= sizeof(buf)) + return "ERROR"; + buf_offs += nchars; + } -out_of_range: - nchars = snprintf(buf, sizeof(buf) - buf_offs, - "!!! L%d out of range", i+1); return buf; } -- 1.9.1