#include "defs.h"
#include "msghdr.h"
+#include <limits.h>
#include <arpa/inet.h>
#include <netinet/in.h>
} union_cmsghdr;
static void
-print_scm_rights(struct tcb *tcp, const void *cmsg_data,
- const size_t data_len)
+print_scm_rights(struct tcb *tcp, const void *cmsg_data, const size_t data_len)
{
const int *fds = cmsg_data;
const size_t nfds = data_len / sizeof(*fds);
size_t i;
- if (!nfds)
- return;
-
- tprints(", cmsg_data=[");
+ tprints("[");
for (i = 0; i < nfds; ++i) {
if (i)
tprints(", ");
+ if (abbrev(tcp) && i >= max_strlen) {
+ tprints("...");
+ break;
+ }
printfd(tcp, fds[i]);
}
}
static void
-print_scm_creds(struct tcb *tcp, const void *cmsg_data,
- const size_t data_len)
+print_scm_creds(struct tcb *tcp, const void *cmsg_data, const size_t data_len)
{
const struct ucred *uc = cmsg_data;
- if (sizeof(*uc) > data_len)
- return;
-
- tprintf(", cmsg_data={pid=%u, uid=%u, gid=%u}",
+ tprintf("{pid=%u, uid=%u, gid=%u}",
(unsigned) uc->pid, (unsigned) uc->uid, (unsigned) uc->gid);
}
print_scm_security(struct tcb *tcp, const void *cmsg_data,
const size_t data_len)
{
- if (!data_len)
- return;
-
- tprints(", cmsg_data=");
print_quoted_string(cmsg_data, data_len, 0);
}
{
const struct in_pktinfo *info = cmsg_data;
- if (sizeof(*info) > data_len)
- return;
-
- tprints(", cmsg_data={ipi_ifindex=");
+ tprints("{ipi_ifindex=");
print_ifindex(info->ipi_ifindex);
tprintf(", ipi_spec_dst=inet_addr(\"%s\")",
inet_ntoa(info->ipi_spec_dst));
}
static void
-print_cmsg_ip_ttl(struct tcb *tcp, const void *cmsg_data,
- const size_t data_len)
+print_cmsg_uint(struct tcb *tcp, const void *cmsg_data, const size_t data_len)
{
- const unsigned int *ttl = cmsg_data;
+ const unsigned int *p = cmsg_data;
- if (sizeof(*ttl) > data_len)
- return;
-
- tprintf(", cmsg_data=[%u]", *ttl);
+ tprintf("[%u]", *p);
}
static void
-print_cmsg_ip_tos(struct tcb *tcp, const void *cmsg_data,
- const size_t data_len)
+print_cmsg_uint8_t(struct tcb *tcp, const void *cmsg_data,
+ const size_t data_len)
{
- const uint8_t *tos = cmsg_data;
-
- if (sizeof(*tos) > data_len)
- return;
+ const uint8_t *p = cmsg_data;
- tprintf(", cmsg_data=[%#x]", *tos);
-}
-
-static void
-print_cmsg_ip_checksum(struct tcb *tcp, const void *cmsg_data,
- const size_t data_len)
-{
- const uint32_t *csum = cmsg_data;
-
- if (sizeof(*csum) > data_len)
- return;
-
- tprintf(", cmsg_data=[%u]", *csum);
+ tprintf("[%#x]", *p);
}
static void
const unsigned char *opts = cmsg_data;
size_t i;
- if (!data_len)
- return;
-
- tprints(", cmsg_data=[");
+ tprints("[");
for (i = 0; i < data_len; ++i) {
if (i)
tprints(", ");
+ if (abbrev(tcp) && i >= max_strlen) {
+ tprints("...");
+ break;
+ }
tprintf("0x%02x", opts[i]);
}
tprints("]");
}
+struct sock_ee {
+ uint32_t ee_errno;
+ uint8_t ee_origin;
+ uint8_t ee_type;
+ uint8_t ee_code;
+ uint8_t ee_pad;
+ uint32_t ee_info;
+ uint32_t ee_data;
+ struct sockaddr_in offender;
+};
+
static void
print_cmsg_ip_recverr(struct tcb *tcp, const void *cmsg_data,
const size_t data_len)
{
- const struct {
- uint32_t ee_errno;
- uint8_t ee_origin;
- uint8_t ee_type;
- uint8_t ee_code;
- uint8_t ee_pad;
- uint32_t ee_info;
- uint32_t ee_data;
- struct sockaddr_in offender;
- } *err = cmsg_data;
-
- if (sizeof(*err) > data_len)
- return;
+ const struct sock_ee *const err = cmsg_data;
- tprintf(", cmsg_data={ee_errno=%u, ee_origin=%u, ee_type=%u, ee_code=%u"
+ tprintf("{ee_errno=%u, ee_origin=%u, ee_type=%u, ee_code=%u"
", ee_info=%u, ee_data=%u, offender=",
err->ee_errno, err->ee_origin, err->ee_type,
err->ee_code, err->ee_info, err->ee_data);
data_len > sizeof(struct sockaddr_storage)
? sizeof(struct sockaddr_storage) : data_len;
- tprints(", cmsg_data=");
print_sockaddr(tcp, cmsg_data, addr_len);
}
+typedef void (* const cmsg_printer)(struct tcb *, const void *, size_t);
+
+static const struct {
+ const cmsg_printer printer;
+ const size_t min_len;
+} cmsg_socket_printers[] = {
+ [SCM_RIGHTS] = { print_scm_rights, sizeof(int) },
+ [SCM_CREDENTIALS] = { print_scm_creds, sizeof(struct ucred) },
+ [SCM_SECURITY] = { print_scm_security, 1 }
+}, cmsg_ip_printers[] = {
+ [IP_PKTINFO] = { print_cmsg_ip_pktinfo, sizeof(struct in_pktinfo) },
+ [IP_TTL] = { print_cmsg_uint, sizeof(unsigned int) },
+ [IP_TOS] = { print_cmsg_uint8_t, 1 },
+ [IP_RECVOPTS] = { print_cmsg_ip_opts, 1 },
+ [IP_RETOPTS] = { print_cmsg_ip_opts, 1 },
+ [IP_RECVERR] = { print_cmsg_ip_recverr, sizeof(struct sock_ee) },
+ [IP_ORIGDSTADDR] = { print_cmsg_ip_origdstaddr, sizeof(struct sockaddr_in) },
+ [IP_CHECKSUM] = { print_cmsg_uint, sizeof(unsigned int) },
+ [SCM_SECURITY] = { print_scm_security, 1 }
+};
+
static void
print_cmsg_type_data(struct tcb *tcp, const int cmsg_level, const int cmsg_type,
const void *cmsg_data, const size_t data_len)
{
+ const unsigned int utype = cmsg_type;
switch (cmsg_level) {
case SOL_SOCKET:
printxval(scmvals, cmsg_type, "SCM_???");
- switch (cmsg_type) {
- case SCM_RIGHTS:
- print_scm_rights(tcp, cmsg_data, data_len);
- break;
- case SCM_CREDENTIALS:
- print_scm_creds(tcp, cmsg_data, data_len);
- break;
- case SCM_SECURITY:
- print_scm_security(tcp, cmsg_data, data_len);
- break;
+ if (utype < ARRAY_SIZE(cmsg_socket_printers)
+ && cmsg_socket_printers[utype].printer
+ && data_len >= cmsg_socket_printers[utype].min_len) {
+ tprints(", cmsg_data=");
+ cmsg_socket_printers[utype].printer(tcp, cmsg_data, data_len);
}
break;
case SOL_IP:
printxval(ip_cmsg_types, cmsg_type, "IP_???");
- switch (cmsg_type) {
- case IP_PKTINFO:
- print_cmsg_ip_pktinfo(tcp, cmsg_data, data_len);
- break;
- case IP_TTL:
- print_cmsg_ip_ttl(tcp, cmsg_data, data_len);
- break;
- case IP_TOS:
- print_cmsg_ip_tos(tcp, cmsg_data, data_len);
- break;
- case IP_RECVOPTS:
- case IP_RETOPTS:
- print_cmsg_ip_opts(tcp, cmsg_data, data_len);
- break;
- case IP_RECVERR:
- print_cmsg_ip_recverr(tcp, cmsg_data, data_len);
- break;
- case IP_ORIGDSTADDR:
- print_cmsg_ip_origdstaddr(tcp, cmsg_data, data_len);
- break;
- case IP_CHECKSUM:
- print_cmsg_ip_checksum(tcp, cmsg_data, data_len);
- break;
- case SCM_SECURITY:
- print_scm_security(tcp, cmsg_data, data_len);
- break;
+ if (utype < ARRAY_SIZE(cmsg_ip_printers)
+ && cmsg_ip_printers[utype].printer
+ && data_len >= cmsg_ip_printers[utype].min_len) {
+ tprints(", cmsg_data=");
+ cmsg_ip_printers[utype].printer(tcp, cmsg_data, data_len);
}
break;
default:
}
}
+static unsigned int
+get_optmem_max(void)
+{
+ static int optmem_max;
+
+ if (!optmem_max) {
+ if (read_int_from_file("/proc/sys/net/core/optmem_max",
+ &optmem_max) || optmem_max <= 0) {
+ optmem_max = sizeof(long long) * (2 * IOV_MAX + 512);
+ } else {
+ optmem_max = (optmem_max + sizeof(long long) - 1)
+ & ~(sizeof(long long) - 1);
+ }
+ }
+
+ return optmem_max;
+}
+
static void
-decode_msg_control(struct tcb *tcp, unsigned long addr, const size_t control_len)
+decode_msg_control(struct tcb *tcp, unsigned long addr,
+ const size_t in_control_len)
{
- if (!control_len)
+ if (!in_control_len)
return;
tprints(", msg_control=");
#endif
sizeof(struct cmsghdr);
+ size_t control_len =
+ in_control_len > get_optmem_max()
+ ? get_optmem_max() : in_control_len;
size_t buf_len = control_len;
char *buf = buf_len < cmsg_size ? NULL : malloc(buf_len);
if (!buf || umoven(tcp, addr, buf_len, buf) < 0) {
if (buf_len) {
tprints(", ");
printaddr(addr + (control_len - buf_len));
+ } else if (control_len < in_control_len) {
+ tprints(", ...");
}
tprints("]");
free(buf);
}
-static void
-print_msghdr(struct tcb *tcp, struct msghdr *msg, unsigned long data_size)
+void
+print_struct_msghdr(struct tcb *tcp, const struct msghdr *msg,
+ const int *const p_user_msg_namelen,
+ const unsigned long data_size)
{
+ const int msg_namelen =
+ p_user_msg_namelen && (int) msg->msg_namelen > *p_user_msg_namelen
+ ? *p_user_msg_namelen : (int) msg->msg_namelen;
+
tprints("{msg_name=");
- decode_sockaddr(tcp, (long)msg->msg_name, msg->msg_namelen);
- tprintf(", msg_namelen=%d", msg->msg_namelen);
+ const int family =
+ decode_sockaddr(tcp, (long) msg->msg_name, msg_namelen);
+ const enum iov_decode decode =
+ (family == AF_NETLINK) ? IOV_DECODE_NETLINK : IOV_DECODE_STR;
+
+ tprints(", msg_namelen=");
+ if (p_user_msg_namelen && *p_user_msg_namelen != (int) msg->msg_namelen)
+ tprintf("%d->", *p_user_msg_namelen);
+ tprintf("%d", msg->msg_namelen);
tprints(", msg_iov=");
+
tprint_iov_upto(tcp, (unsigned long) msg->msg_iovlen,
- (unsigned long) msg->msg_iov, IOV_DECODE_STR, data_size);
+ (unsigned long) msg->msg_iov, decode, data_size);
tprintf(", msg_iovlen=%lu", (unsigned long) msg->msg_iovlen);
decode_msg_control(tcp, (unsigned long) msg->msg_control,
tprints("}");
}
-void
-decode_msghdr(struct tcb *tcp, long addr, unsigned long data_size)
+static bool
+fetch_msghdr_namelen(struct tcb *tcp, const long addr, int *const p_msg_namelen)
+{
+ struct msghdr msg;
+
+ if (addr && verbose(tcp) && fetch_struct_msghdr(tcp, addr, &msg)) {
+ *p_msg_namelen = msg.msg_namelen;
+ return true;
+ } else {
+ return false;
+ }
+}
+
+static void
+decode_msghdr(struct tcb *tcp, const int *const p_user_msg_namelen,
+ const long addr, const unsigned long data_size)
{
struct msghdr msg;
if (addr && verbose(tcp) && fetch_struct_msghdr(tcp, addr, &msg))
- print_msghdr(tcp, &msg, data_size);
+ print_struct_msghdr(tcp, &msg, p_user_msg_namelen, data_size);
else
printaddr(addr);
}
dumpiov_upto(tcp, msg.msg_iovlen, (long)msg.msg_iov, data_size);
}
-static int
-decode_mmsghdr(struct tcb *tcp, long addr, bool use_msg_len)
+SYS_FUNC(sendmsg)
{
- struct mmsghdr mmsg;
- int fetched = fetch_struct_mmsghdr(tcp, addr, &mmsg);
-
- if (fetched) {
- tprints("{msg_hdr=");
- print_msghdr(tcp, &mmsg.msg_hdr, use_msg_len ? mmsg.msg_len : -1UL);
- tprintf(", msg_len=%u}", mmsg.msg_len);
- } else {
- printaddr(addr);
- }
-
- return fetched;
+ printfd(tcp, tcp->u_arg[0]);
+ tprints(", ");
+ decode_msghdr(tcp, 0, tcp->u_arg[1], (unsigned long) -1L);
+ /* flags */
+ tprints(", ");
+ printflags(msg_flags, tcp->u_arg[2], "MSG_???");
+
+ return RVAL_DECODED;
}
-void
-decode_mmsgvec(struct tcb *tcp, unsigned long addr, unsigned int len,
- bool use_msg_len)
+SYS_FUNC(recvmsg)
{
- if (syserror(tcp)) {
- printaddr(addr);
- } else {
- unsigned int i, fetched;
-
- tprints("[");
- for (i = 0; i < len; ++i, addr += fetched) {
- if (i)
- tprints(", ");
- fetched = decode_mmsghdr(tcp, addr, use_msg_len);
- if (!fetched)
- break;
+ int msg_namelen;
+
+ if (entering(tcp)) {
+ printfd(tcp, tcp->u_arg[0]);
+ tprints(", ");
+ if (fetch_msghdr_namelen(tcp, tcp->u_arg[1], &msg_namelen)) {
+ set_tcb_priv_ulong(tcp, msg_namelen);
+ return 0;
}
- tprints("]");
+ printaddr(tcp->u_arg[1]);
+ } else {
+ msg_namelen = get_tcb_priv_ulong(tcp);
+
+ if (syserror(tcp))
+ tprintf("{msg_namelen=%d}", msg_namelen);
+ else
+ decode_msghdr(tcp, &msg_namelen, tcp->u_arg[1],
+ tcp->u_rval);
}
-}
-void
-dumpiov_in_mmsghdr(struct tcb *tcp, long addr)
-{
- unsigned int len = tcp->u_rval;
- unsigned int i, fetched;
- struct mmsghdr mmsg;
+ /* flags */
+ tprints(", ");
+ printflags(msg_flags, tcp->u_arg[2], "MSG_???");
- for (i = 0; i < len; ++i, addr += fetched) {
- fetched = fetch_struct_mmsghdr(tcp, addr, &mmsg);
- if (!fetched)
- break;
- tprintf(" = %lu buffers in vector %u\n",
- (unsigned long)mmsg.msg_hdr.msg_iovlen, i);
- dumpiov_upto(tcp, mmsg.msg_hdr.msg_iovlen,
- (long)mmsg.msg_hdr.msg_iov, mmsg.msg_len);
- }
+ return RVAL_DECODED;
}
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