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315 lines
12 KiB
315 lines
12 KiB
/* Copyright Joyent, Inc. and other Node contributors.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to permit
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* persons to whom the Software is furnished to do so, subject to the
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* following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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* NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* This is the DTrace library file for the node provider, which includes
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* the necessary translators to get from the args[] to something useful.
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* Be warned: the mechanics here are seriously ugly -- and one must always
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* keep in mind that clean abstractions often require filthy systems.
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*/
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#pragma D depends_on library procfs.d
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typedef struct {
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int32_t fd;
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int32_t port;
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uint32_t remote;
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uint32_t buffered;
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} node_dtrace_connection_t;
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typedef struct {
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int32_t fd;
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int32_t port;
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uint64_t remote;
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uint32_t buffered;
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} node_dtrace_connection64_t;
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typedef struct {
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int fd;
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string remoteAddress;
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int remotePort;
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int bufferSize;
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} node_connection_t;
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translator node_connection_t <node_dtrace_connection_t *nc> {
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fd = *(int32_t *)copyin((uintptr_t)&nc->fd, sizeof (int32_t));
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remotePort =
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*(int32_t *)copyin((uintptr_t)&nc->port, sizeof (int32_t));
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remoteAddress = curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr((uintptr_t)*(uint32_t *)copyin((uintptr_t)&nc->remote,
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sizeof (int32_t))) :
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copyinstr((uintptr_t)*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_connection64_t *)nc)->remote, sizeof (int64_t)));
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bufferSize = curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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*(uint32_t *)copyin((uintptr_t)&nc->buffered, sizeof (int32_t)) :
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*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_connection64_t *)nc)->buffered, sizeof (int32_t));
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};
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/*
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* 32-bit and 64-bit structures received from node for HTTP client request
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* probe.
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*/
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typedef struct {
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uint32_t url;
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uint32_t method;
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} node_dtrace_http_client_request_t;
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typedef struct {
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uint64_t url;
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uint64_t method;
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} node_dtrace_http_client_request64_t;
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/*
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* The following structures are never used directly, but must exist to bind the
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* types specified in the provider to the translators defined here.
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* Ultimately, they always get cast to a more specific type inside the
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* translator. To add to the confusion, the DTrace compiler does not allow
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* declaring two translators with the same destination type if the source types
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* are structures with the same size (because libctf says they're compatible,
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* so dtrace considers them equivalent). Since we must define translators from
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* node_dtrace_http_client_request_t (above), node_dtrace_http_request_t, and
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* node_dtrace_http_server_request_t (both below), each of these three structs
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* must be declared with a different size.
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*/
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typedef struct {
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uint32_t version;
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uint64_t dummy1;
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} node_dtrace_http_request_t;
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typedef struct {
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uint32_t version;
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uint64_t dummy2;
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uint64_t dummy3;
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} node_dtrace_http_server_request_t;
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/*
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* Actual 32-bit and 64-bit, v0 and v1 structures received from node for the
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* HTTP server request probe.
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*/
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typedef struct {
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uint32_t url;
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uint32_t method;
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} node_dtrace_http_server_request_v0_t;
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typedef struct {
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uint32_t version;
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uint32_t url;
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uint32_t method;
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uint32_t forwardedFor;
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} node_dtrace_http_server_request_v1_t;
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typedef struct {
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uint64_t url;
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uint64_t method;
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} node_dtrace_http_server_request64_v0_t;
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typedef struct {
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uint32_t version;
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uint32_t pad;
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uint64_t url;
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uint64_t method;
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uint64_t forwardedFor;
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} node_dtrace_http_server_request64_v1_t;
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/*
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* In the end, both client and server request probes from both old and new
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* binaries translate their arguments to node_http_request_t, which is what the
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* user's D script ultimately sees.
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*/
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typedef struct {
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string url;
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string method;
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string forwardedFor;
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} node_http_request_t;
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/*
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* The following translators are particularly filthy for reasons of backwards
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* compatibility. Stable versions of node prior to 0.6 used a single
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* http_request struct with fields for "url" and "method" for both client and
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* server probes. 0.6 added a "forwardedFor" field intended for the server
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* probe only, and the http_request struct passed by the application was split
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* first into client_http_request and server_http_request and the latter was
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* again split for v0 (the old struct) and v1.
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*
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* To distinguish the binary representations of the two versions of these
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* structs, the new version prepends a "version" member (where the old one has
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* a "url" pointer). Each field that we're translating below first switches on
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* the value of this "version" field: if it's larger than 4096, we know we must
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* be looking at the "url" pointer of the older structure version. Otherwise,
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* we must be looking at the new version. Besides this, we have the usual
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* switch based on the userland process data model. This would all be simpler
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* with macros, but those aren't available in D library files since we cannot
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* rely on cpp being present at runtime.
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*
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* In retrospect, the versioning bit might have been unnecessary since the type
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* of the object passed in should allow DTrace to select which translator to
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* use. However, DTrace does sometimes use translators whose source types
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* don't quite match, and since we know this versioning logic works, we just
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* leave it alone. Each of the translators below is functionally identical
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* (except that the client -> client translator doesn't bother translating
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* forwardedFor) and should actually work with any version of any of the client
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* or server structs transmitted by the application up to this point.
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*/
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/*
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* Translate from node_dtrace_http_server_request_t (received from node 0.6 and
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* later versions) to node_http_request_t.
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*/
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translator node_http_request_t <node_dtrace_http_server_request_t *nd> {
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url = (*(uint32_t *)copyin((uintptr_t)(uint32_t *)nd,
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sizeof (uint32_t))) >= 4096 ?
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(curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr(*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request_v0_t *)nd)->url,
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sizeof (uint32_t))) :
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copyinstr(*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request64_v0_t *)nd)->url,
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sizeof (uint64_t)))) :
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(curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr(*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request_v1_t *)nd)->url,
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sizeof (uint32_t))) :
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copyinstr(*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request64_v1_t *)nd)->url,
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sizeof (uint64_t))));
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method = (*(uint32_t *)copyin((uintptr_t)(uint32_t *)nd,
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sizeof (uint32_t))) >= 4096 ?
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(curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr(*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request_v0_t *)nd)->method,
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sizeof (uint32_t))) :
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copyinstr(*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request64_v0_t *)nd)->method,
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sizeof (uint64_t)))) :
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(curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr(*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request_v1_t *)nd)->method,
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sizeof (uint32_t))) :
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copyinstr(*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request64_v1_t *)nd)->method,
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sizeof (uint64_t))));
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forwardedFor = (*(uint32_t *)copyin((uintptr_t)(uint32_t *)nd,
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sizeof (uint32_t))) >= 4096 ? "" :
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(curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr(*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request_v1_t *)nd)->forwardedFor,
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sizeof (uint32_t))) :
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copyinstr(*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request64_v1_t *)nd)->
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forwardedFor, sizeof (uint64_t))));
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};
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/*
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* Translate from node_dtrace_http_client_request_t (received from node 0.6 and
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* later versions) to node_http_request_t.
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*/
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translator node_http_request_t <node_dtrace_http_client_request_t *nd> {
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url = (*(uint32_t *)copyin((uintptr_t)(uint32_t *)nd,
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sizeof (uint32_t))) >= 4096 ?
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(curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr(*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request_v0_t *)nd)->url,
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sizeof (uint32_t))) :
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copyinstr(*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request64_v0_t *)nd)->url,
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sizeof (uint64_t)))) :
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(curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr(*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request_v1_t *)nd)->url,
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sizeof (uint32_t))) :
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copyinstr(*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request64_v1_t *)nd)->url,
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sizeof (uint64_t))));
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method = (*(uint32_t *)copyin((uintptr_t)(uint32_t *)nd,
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sizeof (uint32_t))) >= 4096 ?
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(curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr(*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request_v0_t *)nd)->method,
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sizeof (uint32_t))) :
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copyinstr(*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request64_v0_t *)nd)->method,
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sizeof (uint64_t)))) :
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(curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr(*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request_v1_t *)nd)->method,
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sizeof (uint32_t))) :
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copyinstr(*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request64_v1_t *)nd)->method,
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sizeof (uint64_t))));
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forwardedFor = "";
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};
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/*
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* Translate from node_dtrace_http_request_t (received from versions of node
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* prior to 0.6) to node_http_request_t. This is used for both the server and
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* client probes since these versions of node didn't distinguish between the
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* types used in these probes.
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*/
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translator node_http_request_t <node_dtrace_http_request_t *nd> {
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url = (*(uint32_t *)copyin((uintptr_t)(uint32_t *)nd,
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sizeof (uint32_t))) >= 4096 ?
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(curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr(*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request_v0_t *)nd)->url,
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sizeof (uint32_t))) :
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copyinstr(*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request64_v0_t *)nd)->url,
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sizeof (uint64_t)))) :
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(curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr(*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request_v1_t *)nd)->url,
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sizeof (uint32_t))) :
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copyinstr(*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request64_v1_t *)nd)->url,
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sizeof (uint64_t))));
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method = (*(uint32_t *)copyin((uintptr_t)(uint32_t *)nd,
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sizeof (uint32_t))) >= 4096 ?
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(curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr(*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request_v0_t *)nd)->method,
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sizeof (uint32_t))) :
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copyinstr(*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request64_v0_t *)nd)->method,
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sizeof (uint64_t)))) :
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(curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr(*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request_v1_t *)nd)->method,
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sizeof (uint32_t))) :
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copyinstr(*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request64_v1_t *)nd)->method,
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sizeof (uint64_t))));
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forwardedFor = (*(uint32_t *) copyin((uintptr_t)(uint32_t *)nd,
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sizeof (uint32_t))) >= 4096 ? "" :
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(curpsinfo->pr_dmodel == PR_MODEL_ILP32 ?
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copyinstr(*(uint32_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request_v1_t *)nd)->forwardedFor,
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sizeof (uint32_t))) :
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copyinstr(*(uint64_t *)copyin((uintptr_t)
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&((node_dtrace_http_server_request64_v1_t *)nd)->
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forwardedFor, sizeof (uint64_t))));
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};
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