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msg: Pretty print generic netlink header in nl_msg_dump() 

Signed-off-by: Thomas Graf <tgraf@suug.ch>
This commit is contained in:
Thomas Graf 2013-04-02 23:13:15 +02:00
parent 375a6294a4
commit 56eb22fa74
1 changed files with 97 additions and 41 deletions
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138
lib/msg.c
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@ -767,7 +767,7 @@ static inline void dump_hex(FILE *ofd, char *start, int len, int prefix)
int i, a, c, limit;
char ascii[21] = {0};
limit = 18 - (prefix * 2);
limit = 16 - (prefix * 2);
prefix_line(ofd, prefix);
fprintf(ofd, " ");
@ -777,7 +777,7 @@ static inline void dump_hex(FILE *ofd, char *start, int len, int prefix)
fprintf(ofd, "%02x ", v);
ascii[a++] = isprint(v) ? v : '.';
if (c == limit-1) {
if (++c >= limit) {
fprintf(ofd, "%s\n", ascii);
if (i < (len - 1)) {
prefix_line(ofd, prefix);
@ -785,8 +785,7 @@ static inline void dump_hex(FILE *ofd, char *start, int len, int prefix)
}
a = c = 0;
memset(ascii, 0, sizeof(ascii));
} else
c++;
}
}
if (c != 0) {
@ -816,14 +815,62 @@ static void print_hdr(FILE *ofd, struct nl_msg *msg)
} else
nl_nlmsgtype2str(nlh->nlmsg_type, buf, sizeof(buf));
fprintf(ofd, " .nlmsg_type = %d <%s>\n", nlh->nlmsg_type, buf);
fprintf(ofd, " .nlmsg_flags = %d <%s>\n", nlh->nlmsg_flags,
fprintf(ofd, " .type = %d <%s>\n", nlh->nlmsg_type, buf);
fprintf(ofd, " .flags = %d <%s>\n", nlh->nlmsg_flags,
nl_nlmsg_flags2str(nlh->nlmsg_flags, buf, sizeof(buf)));
fprintf(ofd, " .nlmsg_seq = %d\n", nlh->nlmsg_seq);
fprintf(ofd, " .nlmsg_pid = %d\n", nlh->nlmsg_pid);
fprintf(ofd, " .seq = %d\n", nlh->nlmsg_seq);
fprintf(ofd, " .port = %d\n", nlh->nlmsg_pid);
}
static void print_genl_hdr(FILE *ofd, void *start)
{
struct genlmsghdr *ghdr = start;
fprintf(ofd, " [GENERIC NETLINK HEADER] %zu octets\n", GENL_HDRLEN);
fprintf(ofd, " .cmd = %u\n", ghdr->cmd);
fprintf(ofd, " .version = %u\n", ghdr->version);
fprintf(ofd, " .unused = %#x\n", ghdr->reserved);
}
static void *print_genl_msg(struct nl_msg *msg, FILE *ofd, struct nlmsghdr *hdr,
struct nl_cache_ops *ops, int *payloadlen)
{
void *data = nlmsg_data(hdr);
if (*payloadlen < GENL_HDRLEN)
return data;
print_genl_hdr(ofd, data);
*payloadlen -= GENL_HDRLEN;
data += GENL_HDRLEN;
if (ops) {
int hdrsize = ops->co_hdrsize - GENL_HDRLEN;
if (hdrsize > 0) {
if (*payloadlen < hdrsize)
return data;
fprintf(ofd, " [HEADER] %d octets\n", hdrsize);
dump_hex(ofd, data, hdrsize, 0);
*payloadlen -= hdrsize;
data += hdrsize;
}
}
return data;
}
static void dump_attr(FILE *ofd, struct nlattr *attr, int prefix)
{
int len = nla_len(attr);
dump_hex(ofd, nla_data(attr), len, prefix);
}
static void dump_attrs(FILE *ofd, struct nlattr *attrs, int attrlen,
int prefix)
{
@ -845,7 +892,7 @@ static void dump_attrs(FILE *ofd, struct nlattr *attrs, int attrlen,
if (nla->nla_type & NLA_F_NESTED)
dump_attrs(ofd, nla_data(nla), alen, prefix+1);
else
dump_hex(ofd, nla_data(nla), alen, prefix);
dump_attr(ofd, nla, prefix);
padlen = nla_padlen(alen);
if (padlen > 0) {
@ -884,6 +931,42 @@ static void dump_error_msg(struct nl_msg *msg, FILE *ofd)
}
}
static void print_msg(struct nl_msg *msg, FILE *ofd, struct nlmsghdr *hdr)
{
struct nl_cache_ops *ops;
int payloadlen = nlmsg_len(hdr);
int attrlen = 0;
void *data;
data = nlmsg_data(hdr);
ops = nl_cache_ops_associate_safe(nlmsg_get_proto(msg),
hdr->nlmsg_type);
if (ops) {
attrlen = nlmsg_attrlen(hdr, ops->co_hdrsize);
payloadlen -= attrlen;
}
if (msg->nm_protocol == NETLINK_GENERIC)
data = print_genl_msg(msg, ofd, hdr, ops, &payloadlen);
if (payloadlen) {
fprintf(ofd, " [PAYLOAD] %d octets\n", payloadlen);
dump_hex(ofd, data, payloadlen, 0);
}
if (attrlen) {
struct nlattr *attrs;
int attrlen;
attrs = nlmsg_attrdata(hdr, ops->co_hdrsize);
attrlen = nlmsg_attrlen(hdr, ops->co_hdrsize);
dump_attrs(ofd, attrs, attrlen, 0);
}
if (ops)
nl_cache_ops_put(ops);
}
/**
* Dump message in human readable format to file descriptor
* @arg msg Message to print
@ -894,45 +977,18 @@ void nl_msg_dump(struct nl_msg *msg, FILE *ofd)
struct nlmsghdr *hdr = nlmsg_hdr(msg);
fprintf(ofd,
"-------------------------- BEGIN NETLINK MESSAGE "
"---------------------------\n");
"-------------------------- BEGIN NETLINK MESSAGE ---------------------------\n");
fprintf(ofd, " [HEADER] %zu octets\n", sizeof(struct nlmsghdr));
fprintf(ofd, " [NETLINK HEADER] %zu octets\n", sizeof(struct nlmsghdr));
print_hdr(ofd, msg);
if (hdr->nlmsg_type == NLMSG_ERROR)
dump_error_msg(msg, ofd);
else if (nlmsg_len(hdr) > 0) {
struct nl_cache_ops *ops;
int payloadlen = nlmsg_len(hdr);
int attrlen = 0;
ops = nl_cache_ops_associate_safe(nlmsg_get_proto(msg),
hdr->nlmsg_type);
if (ops) {
attrlen = nlmsg_attrlen(hdr, ops->co_hdrsize);
payloadlen -= attrlen;
}
fprintf(ofd, " [PAYLOAD] %d octets\n", payloadlen);
dump_hex(ofd, nlmsg_data(hdr), payloadlen, 0);
if (attrlen) {
struct nlattr *attrs;
int attrlen;
attrs = nlmsg_attrdata(hdr, ops->co_hdrsize);
attrlen = nlmsg_attrlen(hdr, ops->co_hdrsize);
dump_attrs(ofd, attrs, attrlen, 0);
}
if (ops)
nl_cache_ops_put(ops);
}
else if (nlmsg_len(hdr) > 0)
print_msg(msg, ofd, hdr);
fprintf(ofd,
"--------------------------- END NETLINK MESSAGE "
"---------------------------\n");
"--------------------------- END NETLINK MESSAGE ---------------------------\n");
}
/** @} */