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/*
* prettymsg.c - human readable message dump
*
* Support for pretty print of an ethtool netlink message
*/
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdint.h>
#include <limits.h>
#include <inttypes.h>
#include <linux/genetlink.h>
#include <linux/rtnetlink.h>
#include <linux/if_link.h>
#include <libmnl/libmnl.h>
#include "prettymsg.h"
#define __INDENT 4
#define __DUMP_LINE 16
#define __DUMP_BLOCK 4
static void __print_binary_short(uint8_t *adata, unsigned int alen)
{
unsigned int i;
if (!alen)
return;
printf("%02x", adata[0]);
for (i = 1; i < alen; i++)
printf("%c%02x", (i % __DUMP_BLOCK) ? ':' : ' ', adata[i]);
}
static void __print_binary_long(uint8_t *adata, unsigned int alen,
unsigned int level)
{
unsigned int i;
for (i = 0; i < alen; i++) {
if (i % __DUMP_LINE == 0)
printf("\n%*s", __INDENT * (level + 2), "");
else if (i % __DUMP_BLOCK == 0)
printf(" ");
else
putchar(' ');
printf("%02x", adata[i]);
}
}
static int pretty_print_attr(const struct nlattr *attr,
const struct pretty_nla_desc *desc,
unsigned int ndesc, unsigned int level,
int err_offset, bool in_array)
{
unsigned int alen = mnl_attr_get_payload_len(attr);
unsigned int atype = mnl_attr_get_type(attr);
unsigned int desc_idx = in_array ? 0 : atype;
void *adata = mnl_attr_get_payload(attr);
const struct pretty_nla_desc *adesc;
const char *prefix = " ";
bool nested;
adesc = (desc && desc_idx < ndesc) ? &desc[desc_idx] : NULL;
nested = (adesc && (adesc->format == NLA_NESTED ||
adesc->format == NLA_ARRAY)) ||
(attr->nla_type & NLA_F_NESTED);
if (err_offset >= 0 &&
err_offset < (nested ? NLA_HDRLEN : attr->nla_len)) {
prefix = "===>";
if (err_offset)
fprintf(stderr,
"ethtool: bad_attr inside an attribute (offset %d)\n",
err_offset);
}
if (adesc && adesc->name && !in_array)
printf("%s%*s%s", prefix, level * __INDENT, "", adesc->name);
else
printf("%s%*s[%u]", prefix, level * __INDENT, "", atype);
if (nested) {
struct nlattr *child;
int ret = 0;
putchar('\n');
mnl_attr_for_each_nested(child, attr) {
bool array = adesc && adesc->format == NLA_ARRAY;
unsigned int child_off;
child_off = (const char *)child - (const char *)attr;
ret = pretty_print_attr(child,
adesc ? adesc->children : NULL,
adesc ? adesc->n_children : 0,
level + 1,
err_offset - child_off, array);
if (ret < 0)
break;
}
return ret;
}
printf(" = ");
switch(adesc ? adesc->format : NLA_BINARY) {
case NLA_U8:
printf("%u", mnl_attr_get_u8(attr));
break;
case NLA_U16:
printf("%u", mnl_attr_get_u16(attr));
break;
case NLA_U32:
printf("%u", mnl_attr_get_u32(attr));
break;
case NLA_U64:
printf("%" PRIu64, mnl_attr_get_u64(attr));
break;
case NLA_X8:
printf("0x%02x", mnl_attr_get_u8(attr));
break;
case NLA_X16:
printf("0x%04x", mnl_attr_get_u16(attr));
break;
case NLA_X32:
printf("0x%08x", mnl_attr_get_u32(attr));
break;
case NLA_X64:
printf("%" PRIx64, mnl_attr_get_u64(attr));
break;
case NLA_S8:
printf("%d", (int)mnl_attr_get_u8(attr));
break;
case NLA_S16:
printf("%d", (int)mnl_attr_get_u16(attr));
break;
case NLA_S32:
printf("%d", (int)mnl_attr_get_u32(attr));
break;
case NLA_S64:
printf("%" PRId64, (int64_t)mnl_attr_get_u64(attr));
break;
case NLA_STRING:
printf("\"%.*s\"", alen, (const char *)adata);
break;
case NLA_FLAG:
printf("true");
break;
case NLA_BOOL:
printf("%s", mnl_attr_get_u8(attr) ? "on" : "off");
break;
case NLA_U8_ENUM:
case NLA_U32_ENUM: {
uint32_t val;
if (adesc->format == NLA_U8_ENUM)
val = mnl_attr_get_u8(attr);
else
val = mnl_attr_get_u32(attr);
if (adesc && val < adesc->n_names && adesc->names[val])
printf("%s", adesc->names[val]);
else
printf("%u", val);
break;
}
default:
if (alen <= __DUMP_LINE)
__print_binary_short(adata, alen);
else
__print_binary_long(adata, alen, level);
}
putchar('\n');
return 0;
}
static int pretty_print_nlmsg(const struct nlmsghdr *nlhdr,
unsigned int payload_offset,
const struct pretty_nla_desc *desc,
unsigned int ndesc, unsigned int err_offset)
{
const struct nlattr *attr;
int attr_offset;
int ret;
mnl_attr_for_each(attr, nlhdr, payload_offset) {
attr_offset = (const char *)attr - (const char *)nlhdr;
ret = pretty_print_attr(attr, desc, ndesc, 1,
err_offset - attr_offset, false);
if (ret < 0)
return ret;
}
return 0;
}
int pretty_print_genlmsg(const struct nlmsghdr *nlhdr,
const struct pretty_nlmsg_desc *desc,
unsigned int ndesc, unsigned int err_offset)
{
const struct pretty_nlmsg_desc *msg_desc;
const struct genlmsghdr *genlhdr;
if (mnl_nlmsg_get_payload_len(nlhdr) < GENL_HDRLEN) {
fprintf(stderr, "ethtool: message too short (%u bytes)\n",
nlhdr->nlmsg_len);
return -EINVAL;
}
genlhdr = mnl_nlmsg_get_payload(nlhdr);
msg_desc = (desc && genlhdr->cmd < ndesc) ? &desc[genlhdr->cmd] : NULL;
if (msg_desc && msg_desc->name)
printf(" %s\n", msg_desc->name);
else
printf(" [%u]\n", genlhdr->cmd);
return pretty_print_nlmsg(nlhdr, GENL_HDRLEN,
msg_desc ? msg_desc->attrs : NULL,
msg_desc ? msg_desc->n_attrs : 0, err_offset);
}
static void rtm_link_summary(const struct ifinfomsg *ifinfo)
{
if (ifinfo->ifi_family)
printf(" family=%u", ifinfo->ifi_family);
if (ifinfo->ifi_type)
printf(" type=0x%04x", ifinfo->ifi_type);
if (ifinfo->ifi_index)
printf(" ifindex=%d", ifinfo->ifi_index);
if (ifinfo->ifi_flags)
printf(" flags=0x%x", ifinfo->ifi_flags);
if (ifinfo->ifi_change)
printf(" change=0x%x", ifinfo->ifi_change);
}
int pretty_print_rtnlmsg(const struct nlmsghdr *nlhdr, unsigned int err_offset)
{
const unsigned int idx = (nlhdr->nlmsg_type - RTM_BASE) / 4;
const struct pretty_nlmsg_desc *msg_desc = NULL;
unsigned int hdrlen = USHRT_MAX;
if (nlhdr->nlmsg_type < rtnl_msg_n_desc)
msg_desc = &rtnl_msg_desc[nlhdr->nlmsg_type];
if (idx < rtnl_msghdr_n_len)
hdrlen = rtnl_msghdr_lengths[idx];
if (hdrlen < USHRT_MAX && mnl_nlmsg_get_payload_len(nlhdr) < hdrlen) {
fprintf(stderr, "ethtool: message too short (%u bytes)\n",
nlhdr->nlmsg_len);
return -EINVAL;
}
if (msg_desc && msg_desc->name)
printf(" %s", msg_desc->name);
else
printf(" [%u]", nlhdr->nlmsg_type);
if (idx == (RTM_NEWLINK - RTM_BASE) / 4)
rtm_link_summary(mnl_nlmsg_get_payload(nlhdr));
putchar('\n');
if (hdrlen == USHRT_MAX)
return 0;
return pretty_print_nlmsg(nlhdr, hdrlen,
msg_desc ? msg_desc->attrs : NULL,
msg_desc ? msg_desc->n_attrs : 0, err_offset);
}
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