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-rw-r--r--src/libsystemd/sd-bus/bus-dump.c650
1 files changed, 650 insertions, 0 deletions
diff --git a/src/libsystemd/sd-bus/bus-dump.c b/src/libsystemd/sd-bus/bus-dump.c
new file mode 100644
index 0000000..73939d8
--- /dev/null
+++ b/src/libsystemd/sd-bus/bus-dump.c
@@ -0,0 +1,650 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <sys/time.h>
+
+#include "alloc-util.h"
+#include "bus-dump.h"
+#include "bus-internal.h"
+#include "bus-message.h"
+#include "bus-type.h"
+#include "cap-list.h"
+#include "capability-util.h"
+#include "fileio.h"
+#include "format-util.h"
+#include "glyph-util.h"
+#include "macro.h"
+#include "pcapng.h"
+#include "string-util.h"
+#include "strv.h"
+#include "terminal-util.h"
+#include "util.h"
+
+static char *indent(unsigned level, uint64_t flags) {
+ char *p;
+ unsigned n, i = 0;
+
+ n = 0;
+
+ if (flags & SD_BUS_MESSAGE_DUMP_SUBTREE_ONLY && level > 0)
+ level -= 1;
+
+ if (flags & SD_BUS_MESSAGE_DUMP_WITH_HEADER)
+ n += 2;
+
+ p = new(char, n + level*8 + 1);
+ if (!p)
+ return NULL;
+
+ if (flags & SD_BUS_MESSAGE_DUMP_WITH_HEADER) {
+ p[i++] = ' ';
+ p[i++] = ' ';
+ }
+
+ memset(p + i, ' ', level*8);
+ p[i + level*8] = 0;
+
+ return p;
+}
+
+_public_ int sd_bus_message_dump(sd_bus_message *m, FILE *f, uint64_t flags) {
+ unsigned level = 1;
+ int r;
+
+ assert_return(m, -EINVAL);
+ assert_return((flags & ~_SD_BUS_MESSAGE_DUMP_KNOWN_FLAGS) == 0, -EINVAL);
+
+ if (!f)
+ f = stdout;
+
+ if (flags & SD_BUS_MESSAGE_DUMP_WITH_HEADER) {
+ usec_t ts = m->realtime;
+
+ if (ts == 0)
+ ts = now(CLOCK_REALTIME);
+
+ fprintf(f,
+ "%s%s%s Type=%s%s%s Endian=%c Flags=%u Version=%u",
+ m->header->type == SD_BUS_MESSAGE_METHOD_ERROR ? ansi_highlight_red() :
+ m->header->type == SD_BUS_MESSAGE_METHOD_RETURN ? ansi_highlight_green() :
+ m->header->type != SD_BUS_MESSAGE_SIGNAL ? ansi_highlight() : "",
+ special_glyph(SPECIAL_GLYPH_TRIANGULAR_BULLET),
+ ansi_normal(),
+
+ ansi_highlight(),
+ bus_message_type_to_string(m->header->type) ?: "(unknown)",
+ ansi_normal(),
+
+ m->header->endian,
+ m->header->flags,
+ m->header->version);
+
+ /* Display synthetic message serial number in a more readable
+ * format than UINT32_MAX */
+ if (BUS_MESSAGE_COOKIE(m) == UINT32_MAX)
+ fprintf(f, " Cookie=-1");
+ else
+ fprintf(f, " Cookie=%" PRIu64, BUS_MESSAGE_COOKIE(m));
+
+ if (m->reply_cookie != 0)
+ fprintf(f, " ReplyCookie=%" PRIu64, m->reply_cookie);
+
+ fprintf(f, " Timestamp=\"%s\"\n", strna(FORMAT_TIMESTAMP_STYLE(ts, TIMESTAMP_US_UTC)));
+
+ if (m->sender)
+ fprintf(f, " Sender=%s%s%s", ansi_highlight(), m->sender, ansi_normal());
+ if (m->destination)
+ fprintf(f, " Destination=%s%s%s", ansi_highlight(), m->destination, ansi_normal());
+ if (m->path)
+ fprintf(f, " Path=%s%s%s", ansi_highlight(), m->path, ansi_normal());
+ if (m->interface)
+ fprintf(f, " Interface=%s%s%s", ansi_highlight(), m->interface, ansi_normal());
+ if (m->member)
+ fprintf(f, " Member=%s%s%s", ansi_highlight(), m->member, ansi_normal());
+
+ if (m->sender || m->destination || m->path || m->interface || m->member)
+ fputs("\n", f);
+
+ if (sd_bus_error_is_set(&m->error))
+ fprintf(f,
+ " ErrorName=%s%s%s"
+ " ErrorMessage=%s\"%s\"%s\n",
+ ansi_highlight_red(), strna(m->error.name), ansi_normal(),
+ ansi_highlight_red(), strna(m->error.message), ansi_normal());
+
+ if (m->monotonic != 0)
+ fprintf(f, " Monotonic="USEC_FMT, m->monotonic);
+ if (m->realtime != 0)
+ fprintf(f, " Realtime="USEC_FMT, m->realtime);
+ if (m->seqnum != 0)
+ fprintf(f, " SequenceNumber=%"PRIu64, m->seqnum);
+
+ if (m->monotonic != 0 || m->realtime != 0 || m->seqnum != 0)
+ fputs("\n", f);
+
+ bus_creds_dump(&m->creds, f, true);
+ }
+
+ r = sd_bus_message_rewind(m, !(flags & SD_BUS_MESSAGE_DUMP_SUBTREE_ONLY));
+ if (r < 0)
+ return log_error_errno(r, "Failed to rewind: %m");
+
+ if (!(flags & SD_BUS_MESSAGE_DUMP_SUBTREE_ONLY)) {
+ _cleanup_free_ char *prefix = NULL;
+
+ prefix = indent(0, flags);
+ if (!prefix)
+ return log_oom();
+
+ fprintf(f, "%sMESSAGE \"%s\" {\n", prefix, strempty(m->root_container.signature));
+ }
+
+ for (;;) {
+ _cleanup_free_ char *prefix = NULL;
+ const char *contents = NULL;
+ char type;
+ union {
+ uint8_t u8;
+ uint16_t u16;
+ int16_t s16;
+ uint32_t u32;
+ int32_t s32;
+ uint64_t u64;
+ int64_t s64;
+ double d64;
+ const char *string;
+ int i;
+ } basic;
+
+ r = sd_bus_message_peek_type(m, &type, &contents);
+ if (r < 0)
+ return log_error_errno(r, "Failed to peek type: %m");
+
+ if (r == 0) {
+ if (level <= 1)
+ break;
+
+ r = sd_bus_message_exit_container(m);
+ if (r < 0)
+ return log_error_errno(r, "Failed to exit container: %m");
+
+ level--;
+
+ prefix = indent(level, flags);
+ if (!prefix)
+ return log_oom();
+
+ fprintf(f, "%s};\n", prefix);
+ continue;
+ }
+
+ prefix = indent(level, flags);
+ if (!prefix)
+ return log_oom();
+
+ if (bus_type_is_container(type) > 0) {
+ r = sd_bus_message_enter_container(m, type, contents);
+ if (r < 0)
+ return log_error_errno(r, "Failed to enter container: %m");
+
+ if (type == SD_BUS_TYPE_ARRAY)
+ fprintf(f, "%sARRAY \"%s\" {\n", prefix, contents);
+ else if (type == SD_BUS_TYPE_VARIANT)
+ fprintf(f, "%sVARIANT \"%s\" {\n", prefix, contents);
+ else if (type == SD_BUS_TYPE_STRUCT)
+ fprintf(f, "%sSTRUCT \"%s\" {\n", prefix, contents);
+ else if (type == SD_BUS_TYPE_DICT_ENTRY)
+ fprintf(f, "%sDICT_ENTRY \"%s\" {\n", prefix, contents);
+
+ level++;
+
+ continue;
+ }
+
+ r = sd_bus_message_read_basic(m, type, &basic);
+ if (r < 0)
+ return log_error_errno(r, "Failed to get basic: %m");
+
+ assert(r > 0);
+
+ switch (type) {
+
+ case SD_BUS_TYPE_BYTE:
+ fprintf(f, "%sBYTE %s%u%s;\n", prefix, ansi_highlight(), basic.u8, ansi_normal());
+ break;
+
+ case SD_BUS_TYPE_BOOLEAN:
+ fprintf(f, "%sBOOLEAN %s%s%s;\n", prefix, ansi_highlight(), true_false(basic.i), ansi_normal());
+ break;
+
+ case SD_BUS_TYPE_INT16:
+ fprintf(f, "%sINT16 %s%i%s;\n", prefix, ansi_highlight(), basic.s16, ansi_normal());
+ break;
+
+ case SD_BUS_TYPE_UINT16:
+ fprintf(f, "%sUINT16 %s%u%s;\n", prefix, ansi_highlight(), basic.u16, ansi_normal());
+ break;
+
+ case SD_BUS_TYPE_INT32:
+ fprintf(f, "%sINT32 %s%i%s;\n", prefix, ansi_highlight(), basic.s32, ansi_normal());
+ break;
+
+ case SD_BUS_TYPE_UINT32:
+ fprintf(f, "%sUINT32 %s%u%s;\n", prefix, ansi_highlight(), basic.u32, ansi_normal());
+ break;
+
+ case SD_BUS_TYPE_INT64:
+ fprintf(f, "%sINT64 %s%"PRIi64"%s;\n", prefix, ansi_highlight(), basic.s64, ansi_normal());
+ break;
+
+ case SD_BUS_TYPE_UINT64:
+ fprintf(f, "%sUINT64 %s%"PRIu64"%s;\n", prefix, ansi_highlight(), basic.u64, ansi_normal());
+ break;
+
+ case SD_BUS_TYPE_DOUBLE:
+ fprintf(f, "%sDOUBLE %s%g%s;\n", prefix, ansi_highlight(), basic.d64, ansi_normal());
+ break;
+
+ case SD_BUS_TYPE_STRING:
+ fprintf(f, "%sSTRING \"%s%s%s\";\n", prefix, ansi_highlight(), basic.string, ansi_normal());
+ break;
+
+ case SD_BUS_TYPE_OBJECT_PATH:
+ fprintf(f, "%sOBJECT_PATH \"%s%s%s\";\n", prefix, ansi_highlight(), basic.string, ansi_normal());
+ break;
+
+ case SD_BUS_TYPE_SIGNATURE:
+ fprintf(f, "%sSIGNATURE \"%s%s%s\";\n", prefix, ansi_highlight(), basic.string, ansi_normal());
+ break;
+
+ case SD_BUS_TYPE_UNIX_FD:
+ fprintf(f, "%sUNIX_FD %s%i%s;\n", prefix, ansi_highlight(), basic.i, ansi_normal());
+ break;
+
+ default:
+ assert_not_reached();
+ }
+ }
+
+ if (!(flags & SD_BUS_MESSAGE_DUMP_SUBTREE_ONLY)) {
+ _cleanup_free_ char *prefix = NULL;
+
+ prefix = indent(0, flags);
+ if (!prefix)
+ return log_oom();
+
+ fprintf(f, "%s};\n\n", prefix);
+ }
+
+ return 0;
+}
+
+static void dump_capabilities(
+ sd_bus_creds *c,
+ FILE *f,
+ const char *name,
+ bool terse,
+ int (*has)(sd_bus_creds *c, int capability)) {
+
+ unsigned long i, last_cap;
+ unsigned n = 0;
+ int r;
+
+ assert(c);
+ assert(f);
+ assert(name);
+ assert(has);
+
+ i = 0;
+ r = has(c, i);
+ if (r < 0)
+ return;
+
+ fprintf(f, "%s%s=%s", terse ? " " : "", name, terse ? "" : ansi_highlight());
+ last_cap = cap_last_cap();
+
+ for (;;) {
+ if (r > 0) {
+
+ if (n > 0)
+ fputc(' ', f);
+ if (n % 4 == 3)
+ fprintf(f, terse ? "\n " : "\n ");
+
+ fprintf(f, "%s", strna(capability_to_name(i)));
+ n++;
+ }
+
+ i++;
+
+ if (i > last_cap)
+ break;
+
+ r = has(c, i);
+ }
+
+ fputs("\n", f);
+
+ if (!terse)
+ fputs(ansi_normal(), f);
+}
+
+int bus_creds_dump(sd_bus_creds *c, FILE *f, bool terse) {
+ uid_t owner, audit_loginuid;
+ uint32_t audit_sessionid;
+ char **cmdline = NULL, **well_known = NULL;
+ const char *prefix, *color, *suffix, *s;
+ int r, q, v, w, z;
+
+ assert(c);
+
+ if (!f)
+ f = stdout;
+
+ if (terse) {
+ prefix = " ";
+ suffix = "";
+ color = "";
+ } else {
+ const char *off;
+
+ prefix = "";
+ color = ansi_highlight();
+
+ off = ansi_normal();
+ suffix = strjoina(off, "\n");
+ }
+
+ if (c->mask & SD_BUS_CREDS_PID)
+ fprintf(f, "%sPID=%s"PID_FMT"%s", prefix, color, c->pid, suffix);
+ if (c->mask & SD_BUS_CREDS_TID)
+ fprintf(f, "%sTID=%s"PID_FMT"%s", prefix, color, c->tid, suffix);
+ if (c->mask & SD_BUS_CREDS_PPID) {
+ if (c->ppid == 0)
+ fprintf(f, "%sPPID=%sn/a%s", prefix, color, suffix);
+ else
+ fprintf(f, "%sPPID=%s"PID_FMT"%s", prefix, color, c->ppid, suffix);
+ }
+ if (c->mask & SD_BUS_CREDS_TTY)
+ fprintf(f, "%sTTY=%s%s%s", prefix, color, strna(c->tty), suffix);
+
+ if (terse && ((c->mask & (SD_BUS_CREDS_PID|SD_BUS_CREDS_TID|SD_BUS_CREDS_PPID|SD_BUS_CREDS_TTY))))
+ fputs("\n", f);
+
+ if (c->mask & SD_BUS_CREDS_UID)
+ fprintf(f, "%sUID=%s"UID_FMT"%s", prefix, color, c->uid, suffix);
+ if (c->mask & SD_BUS_CREDS_EUID)
+ fprintf(f, "%sEUID=%s"UID_FMT"%s", prefix, color, c->euid, suffix);
+ if (c->mask & SD_BUS_CREDS_SUID)
+ fprintf(f, "%sSUID=%s"UID_FMT"%s", prefix, color, c->suid, suffix);
+ if (c->mask & SD_BUS_CREDS_FSUID)
+ fprintf(f, "%sFSUID=%s"UID_FMT"%s", prefix, color, c->fsuid, suffix);
+ r = sd_bus_creds_get_owner_uid(c, &owner);
+ if (r >= 0)
+ fprintf(f, "%sOwnerUID=%s"UID_FMT"%s", prefix, color, owner, suffix);
+ if (c->mask & SD_BUS_CREDS_GID)
+ fprintf(f, "%sGID=%s"GID_FMT"%s", prefix, color, c->gid, suffix);
+ if (c->mask & SD_BUS_CREDS_EGID)
+ fprintf(f, "%sEGID=%s"GID_FMT"%s", prefix, color, c->egid, suffix);
+ if (c->mask & SD_BUS_CREDS_SGID)
+ fprintf(f, "%sSGID=%s"GID_FMT"%s", prefix, color, c->sgid, suffix);
+ if (c->mask & SD_BUS_CREDS_FSGID)
+ fprintf(f, "%sFSGID=%s"GID_FMT"%s", prefix, color, c->fsgid, suffix);
+
+ if (c->mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) {
+ fprintf(f, "%sSupplementaryGIDs=%s", prefix, color);
+ for (unsigned i = 0; i < c->n_supplementary_gids; i++)
+ fprintf(f, "%s" GID_FMT, i > 0 ? " " : "", c->supplementary_gids[i]);
+ fprintf(f, "%s", suffix);
+ }
+
+ if (terse && ((c->mask & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID|
+ SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID|
+ SD_BUS_CREDS_SUPPLEMENTARY_GIDS)) || r >= 0))
+ fputs("\n", f);
+
+ if (c->mask & SD_BUS_CREDS_COMM)
+ fprintf(f, "%sComm=%s%s%s", prefix, color, c->comm, suffix);
+ if (c->mask & SD_BUS_CREDS_TID_COMM)
+ fprintf(f, "%sTIDComm=%s%s%s", prefix, color, c->tid_comm, suffix);
+ if (c->mask & SD_BUS_CREDS_EXE)
+ fprintf(f, "%sExe=%s%s%s", prefix, color, strna(c->exe), suffix);
+
+ if (terse && (c->mask & (SD_BUS_CREDS_EXE|SD_BUS_CREDS_COMM|SD_BUS_CREDS_TID_COMM)))
+ fputs("\n", f);
+
+ r = sd_bus_creds_get_cmdline(c, &cmdline);
+ if (r >= 0) {
+ fprintf(f, "%sCommandLine=%s", prefix, color);
+ STRV_FOREACH(i, cmdline) {
+ if (i != cmdline)
+ fputc(' ', f);
+
+ fputs(*i, f);
+ }
+
+ fprintf(f, "%s", suffix);
+ } else if (r != -ENODATA)
+ fprintf(f, "%sCommandLine=%sn/a%s", prefix, color, suffix);
+
+ if (c->mask & SD_BUS_CREDS_SELINUX_CONTEXT)
+ fprintf(f, "%sLabel=%s%s%s", prefix, color, c->label, suffix);
+ if (c->mask & SD_BUS_CREDS_DESCRIPTION)
+ fprintf(f, "%sDescription=%s%s%s", prefix, color, c->description, suffix);
+
+ if (terse && (c->mask & (SD_BUS_CREDS_SELINUX_CONTEXT|SD_BUS_CREDS_DESCRIPTION)))
+ fputs("\n", f);
+
+ if (c->mask & SD_BUS_CREDS_CGROUP)
+ fprintf(f, "%sCGroup=%s%s%s", prefix, color, c->cgroup, suffix);
+ s = NULL;
+ r = sd_bus_creds_get_unit(c, &s);
+ if (r != -ENODATA)
+ fprintf(f, "%sUnit=%s%s%s", prefix, color, strna(s), suffix);
+ s = NULL;
+ v = sd_bus_creds_get_slice(c, &s);
+ if (v != -ENODATA)
+ fprintf(f, "%sSlice=%s%s%s", prefix, color, strna(s), suffix);
+ s = NULL;
+ q = sd_bus_creds_get_user_unit(c, &s);
+ if (q != -ENODATA)
+ fprintf(f, "%sUserUnit=%s%s%s", prefix, color, strna(s), suffix);
+ s = NULL;
+ w = sd_bus_creds_get_user_slice(c, &s);
+ if (w != -ENODATA)
+ fprintf(f, "%sUserSlice=%s%s%s", prefix, color, strna(s), suffix);
+ s = NULL;
+ z = sd_bus_creds_get_session(c, &s);
+ if (z != -ENODATA)
+ fprintf(f, "%sSession=%s%s%s", prefix, color, strna(s), suffix);
+
+ if (terse && ((c->mask & SD_BUS_CREDS_CGROUP) || r != -ENODATA || q != -ENODATA || v != -ENODATA || w != -ENODATA || z != -ENODATA))
+ fputs("\n", f);
+
+ r = sd_bus_creds_get_audit_login_uid(c, &audit_loginuid);
+ if (r >= 0)
+ fprintf(f, "%sAuditLoginUID=%s"UID_FMT"%s", prefix, color, audit_loginuid, suffix);
+ else if (r != -ENODATA)
+ fprintf(f, "%sAuditLoginUID=%sn/a%s", prefix, color, suffix);
+ q = sd_bus_creds_get_audit_session_id(c, &audit_sessionid);
+ if (q >= 0)
+ fprintf(f, "%sAuditSessionID=%s%"PRIu32"%s", prefix, color, audit_sessionid, suffix);
+ else if (q != -ENODATA)
+ fprintf(f, "%sAuditSessionID=%sn/a%s", prefix, color, suffix);
+
+ if (terse && (r != -ENODATA || q != -ENODATA))
+ fputs("\n", f);
+
+ if (c->mask & SD_BUS_CREDS_UNIQUE_NAME)
+ fprintf(f, "%sUniqueName=%s%s%s", prefix, color, c->unique_name, suffix);
+
+ if (sd_bus_creds_get_well_known_names(c, &well_known) >= 0) {
+ fprintf(f, "%sWellKnownNames=%s", prefix, color);
+ STRV_FOREACH(i, well_known) {
+ if (i != well_known)
+ fputc(' ', f);
+
+ fputs(*i, f);
+ }
+
+ fprintf(f, "%s", suffix);
+ }
+
+ if (terse && (c->mask & SD_BUS_CREDS_UNIQUE_NAME || well_known))
+ fputc('\n', f);
+
+ dump_capabilities(c, f, "EffectiveCapabilities", terse, sd_bus_creds_has_effective_cap);
+ dump_capabilities(c, f, "PermittedCapabilities", terse, sd_bus_creds_has_permitted_cap);
+ dump_capabilities(c, f, "InheritableCapabilities", terse, sd_bus_creds_has_inheritable_cap);
+ dump_capabilities(c, f, "BoundingCapabilities", terse, sd_bus_creds_has_bounding_cap);
+
+ return 0;
+}
+
+static uint16_t pcapng_optlen(size_t len) {
+ return ALIGN4(len + sizeof(struct pcapng_option));
+}
+
+static void pcapng_putopt(FILE *f, uint16_t code, const void *data, size_t len) {
+ struct pcapng_option opt = {
+ .code = code,
+ .length = len,
+ };
+
+ assert(f);
+ assert((uint16_t) len == len);
+ assert(data || len == 0);
+
+ fwrite(&opt, 1, sizeof(opt), f);
+ if (len > 0) {
+ size_t pad = ALIGN4(len) - len;
+
+ fwrite(data, 1, len, f);
+
+ assert(pad < sizeof(uint32_t));
+ while (pad-- > 0)
+ fputc('\0', f);
+ }
+}
+
+static void pcapng_section_header(FILE *f, const char *os, const char *app) {
+ uint32_t len;
+
+ assert(f);
+
+ /* determine length of section header and options */
+ len = sizeof(struct pcapng_section);
+ if (os)
+ len += pcapng_optlen(strlen(os));
+ if (app)
+ len += pcapng_optlen(strlen(app));
+ len += pcapng_optlen(0); /* OPT_END */
+ len += sizeof(uint32_t); /* trailer length */
+
+ struct pcapng_section hdr = {
+ .block_type = PCAPNG_SECTION_BLOCK,
+ .block_length = len,
+ .byte_order_magic = PCAPNG_BYTE_ORDER_MAGIC,
+ .major_version = PCAPNG_MAJOR_VERS,
+ .minor_version = PCAPNG_MINOR_VERS,
+ .section_length = UINT64_MAX,
+ };
+
+ fwrite(&hdr, 1, sizeof(hdr), f);
+ if (os)
+ pcapng_putopt(f, PCAPNG_SHB_OS, os, strlen(os));
+ if (app)
+ pcapng_putopt(f, PCAPNG_SHB_USERAPPL, app, strlen(app));
+ pcapng_putopt(f, PCAPNG_OPT_END, NULL, 0);
+ fwrite(&len, 1, sizeof(uint32_t), f);
+}
+
+/* Only have a single instance of dbus pseudo interface */
+static void pcapng_interface_header(FILE *f, size_t snaplen) {
+ uint32_t len;
+
+ assert(f);
+ assert(snaplen > 0);
+ assert((size_t) (uint32_t) snaplen == snaplen);
+
+ /* no options (yet) */
+ len = sizeof(struct pcapng_interface_block) + sizeof(uint32_t);
+ struct pcapng_interface_block hdr = {
+ .block_type = PCAPNG_INTERFACE_BLOCK,
+ .block_length = len,
+ .link_type = 231, /* D-Bus */
+ .snap_len = snaplen,
+ };
+
+ fwrite(&hdr, 1, sizeof(hdr), f);
+ fwrite(&len, 1, sizeof(uint32_t), f);
+}
+
+int bus_pcap_header(size_t snaplen, const char *os, const char *info, FILE *f) {
+ if (!f)
+ f = stdout;
+
+ pcapng_section_header(f, os, info);
+ pcapng_interface_header(f, snaplen);
+ return fflush_and_check(f);
+}
+
+int bus_message_pcap_frame(sd_bus_message *m, size_t snaplen, FILE *f) {
+ struct bus_body_part *part;
+ size_t msglen, caplen, pad;
+ uint32_t length;
+ uint64_t ts;
+ unsigned i;
+ size_t w;
+
+ if (!f)
+ f = stdout;
+
+ assert(m);
+ assert(snaplen > 0);
+ assert((size_t) (uint32_t) snaplen == snaplen);
+
+ ts = m->realtime ?: now(CLOCK_REALTIME);
+ msglen = BUS_MESSAGE_SIZE(m);
+ caplen = MIN(msglen, snaplen);
+ pad = ALIGN4(caplen) - caplen;
+
+ /* packet block has no options */
+ length = sizeof(struct pcapng_enhance_packet_block)
+ + caplen + pad + sizeof(uint32_t);
+
+ struct pcapng_enhance_packet_block epb = {
+ .block_type = PCAPNG_ENHANCED_PACKET_BLOCK,
+ .block_length = length,
+ .interface_id = 0,
+ .timestamp_hi = (uint32_t)(ts >> 32),
+ .timestamp_lo = (uint32_t)ts,
+ .original_length = msglen,
+ .capture_length = caplen,
+ };
+
+ /* write the pcapng enhanced packet block header */
+ fwrite(&epb, 1, sizeof(epb), f);
+
+ /* write the dbus header */
+ w = MIN(BUS_MESSAGE_BODY_BEGIN(m), snaplen);
+ fwrite(m->header, 1, w, f);
+ snaplen -= w;
+
+ /* write the dbus body */
+ MESSAGE_FOREACH_PART(part, i, m) {
+ if (snaplen <= 0)
+ break;
+
+ w = MIN(part->size, snaplen);
+ fwrite(part->data, 1, w, f);
+ snaplen -= w;
+ }
+
+ while (pad-- > 0)
+ fputc('\0', f);
+
+ /* trailing block length */
+ fwrite(&length, 1, sizeof(uint32_t), f);
+
+ return fflush_and_check(f);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 17:43:39 +0000