Changeset 66ffac4

Timestamp:

01/17/19 14:33:40 (22 months ago)

Author:

Jacob Van Walraven <jcv9@…>

Branches:

develop

Children:

c8171e5

Parents:

d4eed70

Message:

Add more meta functions, cleanup function names, DLLEXPORT all meta-api prototypes

Location:

lib

Files:

• format_pcapng.c (modified) (1 diff)
• format_pktmeta.c (modified) (8 diffs)
• libtrace.h.in (modified) (1 diff)
• libtrace_int.h (modified) (1 diff)

lib/format_pcapng.c

@@ -2342 +2342 @@
 
                 result->items = malloc(sizeof(libtrace_meta_item_t));
-                result->items->option = option;
-                result->items->len = len;
-                result->items->data_type = 0;
-                result->items->data = calloc(1, len);
+                result->items[result->num-1].option = option;
+                result->items[result->num-1].len = len;
+                result->items[result->num-1].data_type = 0;
+                result->items[result->num-1].data = calloc(1, len);
 
                 memcpy(result->items->data, ptr+sizeof(struct pcapng_optheader), len);

lib/format_pktmeta.c

@@ -10 +10 @@
 
 /* Internal Meta functions */
-
 static int trace_meta_check_input(libtrace_packet_t *packet, char *input_func) {
         if (packet == NULL) {
@@ -49 +48 @@
 }
 
-/* Get the interface name/s
+/* Get the interface name/s for a meta packet.
+ * Must be destroyed with trace_destroy_meta().
+ *
+ * @params libtrace_packet_t meta packet.
+ * @returns Pointer to libtrace_meta_t structure containing all found interface names
+ * or NULL.
+ */
+libtrace_meta_t *trace_get_interface_name_meta(libtrace_packet_t *packet) {
+        if (trace_meta_check_input(packet, "trace_get_interface_name()")<0) {
+                return NULL;
+        }
+
+        /* get the result */
+        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_NAME);
+        }
+        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_NAME);
+        }
+
+        return NULL;
+}
+/* Get the interface name for a meta packet.
+ * Note: ERF packets can contain multiple interfaces per meta packet. Use index to
+ * specify the interface index.
+ *
+ * @params libtrace_packet_t meta packet to extract the interface name from.
+ * @params A pointer to a character buffer to store the interface name in.
+ * @params The size of the buffer passed in.
+ * @params The interface index within the meta packet.
+ * @returns Pointer to the character buffer containing the interface name or NULL.
+ */
+char *trace_get_interface_name(libtrace_packet_t *packet, char *space, int spacelen,
+        int index) {
+
+        libtrace_meta_t *r = trace_get_interface_name_meta(packet);
+        if (r == NULL) { return NULL; }
+        /* If there is not a result for the index return */
+        if (r->num <= index) { return NULL; }
+        /* Ensure the supplied memory allocation is enough, if not only fill
+         * what we can */
+        if (spacelen > r->items[index].len) {
+                memcpy(space, r->items[index].data, r->items[index].len);
+        } else {
+                memcpy(space, r->items[index].data, spacelen);
+        }
+        trace_destroy_meta(r);
+        return space;
+}
+/* Get the interface MAC address/s for a meta packet.
+ * Must be destroyed with trace_destroy_meta().
+ *
+ * @params libtrace_packet_t meta packet.
+ * @returns Pointer to libtrace_meta_t structure containing all found interface mac
+ * addresses or NULL.
+ */
+libtrace_meta_t *trace_get_interface_mac_meta(libtrace_packet_t *packet) {
+        if (trace_meta_check_input(packet, "trace_get_interface_mac()")<0) {
+                return NULL;
+        }
+
+        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_IF_MAC);
+        }
+        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_MAC);
+        }
+
+        return NULL;
+}
+/* Get the interface MAC address for a meta packet.
+ * Note: ERF packets can contain multiple interfaces per meta packet. Use index to
+ * specify the interface index.
+ *
+ * @params libtrace_packet_t meta packet to extract the MAC address from.
+ * @params A pointer to a character buffer to store the MAC address in.
+ * @params The size of the buffer passed in.
+ * @params The interface index within the meta packet.
+ * @returns Pointer to the character buffer containing the MAC address or NULL.
+ */
+char *trace_get_interface_mac(libtrace_packet_t *packet, char *space, int spacelen,
+        int index) {
+
+        libtrace_meta_t *r = trace_get_interface_mac_meta(packet);
+        if (r == NULL) { return NULL; }
+        if (index >= r->num) { return NULL; }
+        if (r->items[index].len > spacelen) {
+                memcpy(space, r->items[index].data, spacelen);
+        } else {
+                memcpy(space, r->items[index].data, r->items[index].len);
+        }
+        trace_destroy_meta(r);
+        return space;
+}
+
+/* Get the interface speed/s from a meta packet.
+ * Must be destroyed with trace_destroy_meta().
+ *
+ * @params libtrace_packet_t packet.
+ * @returns Pointer to libtrace_meta_t structure containing all found interface
+ * speeds or NULL.
+ */
+libtrace_meta_t *trace_get_interface_speed_meta(libtrace_packet_t *packet) {
+        if (trace_meta_check_input(packet, "trace_get_interface_speed()")<0) {
+                return NULL;
+        }
+
+        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_IF_SPEED);
+        }
+        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_SPEED);
+        }
+
+        return NULL;
+}
+/* Get the interface speed for a meta packet.
+ * Note: ERF packets can contain multiple interfaces per meta packet. Use index to
+ * specify the interface index.
+ *
+ * @params libtrace_packet_t meta packet to extract the interface speed from.
+ * @params The interface index within the meta packet.
+ * @returns uint64_t interface speed or NULL.
+ */
+uint64_t trace_get_interface_speed(libtrace_packet_t *packet, int index) {
+        libtrace_meta_t *r = trace_get_interface_speed_meta(packet);
+        if (r == NULL) { return 0; }
+        /* If the index wanted does not exist return 0 */
+        if (index >= r->num) { return 0; }
+        /* Need to check this more ERF reports this in network order */
+        uint64_t data = *(uint64_t *)r->items[index].data;
+        trace_destroy_meta(r);
+        return data;
+}
+
+/* Get the interface ipv4 address/s for a meta packet.
+ * Must be destroyed with trace_destroy_meta().
+ *
+ * @params libtrace_packet_t meta packet.
+ * @returns Pointer to libtrace_meta_t structure containing all found ipv4 addresses
+ * or NULL
+ */
+libtrace_meta_t *trace_get_interface_ipv4_meta(libtrace_packet_t *packet) {
+        if (trace_meta_check_input(packet, "trace_get_interface_ip4()")<0) {
+                return NULL;
+        }
+
+        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_IF_IPV4);
+        }
+        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_IP4);
+        }
+
+        return NULL;
+}
+/* Get the interface ipv4 address for a meta packet.
+ * Note: ERF packets can contain multiple interfaces per meta packet. Use index to
+ * specify the interface index.
+ *
+ * @params libtrace_packet_t meta packet to extract the ipv4 address from.
+ * @params The interface index within the meta packet.
+ * @returns uint32_t ipv4 address or 0.
+ */
+uint32_t trace_get_interface_ipv4(libtrace_packet_t *packet, int index) {
+        libtrace_meta_t *r = trace_get_interface_ipv4_meta(packet);
+        if (r == NULL) { return 0; }
+        if (index >= r->num) { return 0; }
+        uint32_t data = *(uint32_t *)r->items[index].data;
+        trace_destroy_meta(r);
+        return data;
+}
+/* Get the interface ipv4 address string for a meta packet.
+ * Note: ERF packets can contain multiple interfaces per meta packet. Use index to
+ * specify the interface index.
+ *
+ * @params libtrace_packet_t meta packet to extract the ipv4 address from.
+ * @params A pointer to a character buffer to store the ipv4 address string in.
+ * @params The size of the buffer passed in.
+ * @params The interface index within the meta packet.
+ * @returns Pointer to the character buffer containing the ipv4 address string or NULL.
+ */
+char *trace_get_interface_ipv4_string(libtrace_packet_t *packet, char *space, int spacelen,
+        int index) {
+
+        uint32_t addr = htonl(trace_get_interface_ipv4(packet, index));
+        if (addr == 0) { return NULL; }
+
+        char *addrstr = inet_ntoa(*(struct in_addr *)&addr);
+        memcpy(space, addrstr, strlen(addrstr));
+        return space;
+}
+
+/* Get the interface ipv6 address/s for a meta packet.
+ * Must be destroyed with trace_destroy_meta().
+ *
+ * @params libtrace_packet_t meta packet.
+ * @returns Pointer to libtrace_meta_t structure containing all found ipv6 addresses
+ * or NULL.
+ */
+libtrace_meta_t *trace_get_interface_ipv6_meta(libtrace_packet_t *packet) {
+        if (trace_meta_check_input(packet, "trace_get_interface_ip6()")<0) {
+                return NULL;
+        }
+
+        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_IF_IPV4);
+        }
+        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_IP4);
+        }
+
+        return NULL;
+}
+/* Get the interface ipv6 address for a meta packet.
+ * Note: ERF packets can contain multiple interfaces per meta packet. Use index to
+ * specify the interface index.
+ *
+ * @params libtrace_packet_t meta packet to extract the ipv6 address from.
+ * @params A pointer to a character buffer to store the ipv6 address in.
+ * @params The size of the buffer passed in.
+ * @params The interface index within the meta packet.
+ * @returns Pointer to the buffer containing the ipv6 address or NULL.
+ */
+void *trace_get_interface_ipv6(libtrace_packet_t *packet, void *space, int spacelen,
+        int index) {
+
+        libtrace_meta_t *r = trace_get_interface_ipv6_meta(packet);
+        if (r == NULL) { return NULL; }
+        if (r->num <= index) { return NULL; }
+        if (r->items[index].len > spacelen) {
+                memcpy(space, r->items[index].data, spacelen);
+        } else {
+                memcpy(space, r->items[index].data, r->items[index].len);
+        }
+        trace_destroy_meta(r);
+        return space;
+}
+/* Get the interface ipv6 address string for a meta packet.
+ * Note: ERF packets can contain multiple interfaces per meta packet. Use index to
+ * specify the interface index.
+ *
+ * @params libtrace_packet_t meta packet to extract the ipv6 address from.
+ * @params A pointer to a character buffer to store the ipv6 address in.
+ * @params The size of the buffer passed in.
+ * @params The interface index within the meta packet.
+ * @returns Pointer to the character buffer containing the ipv6 address string or NULL.
+ */
+char *trace_get_interface_ipv6_string(libtrace_packet_t *packet, char *space, int spacelen,
+        int index) {
+
+        return NULL;
+}
+
+
+/* Get the interface description/s for a meta packet.
+ * Must be destroyed with trace_destroy_meta().
+ *
+ * @params libtrace_packet_t meta packet.
+ * @returns Pointer to libtrace_meta_t structure containing all found interface
+ * descriptions or NULL.
+ */
+libtrace_meta_t *trace_get_interface_description_meta(libtrace_packet_t *packet) {
+        if (trace_meta_check_input(packet, "trace_get_interface_description()")<0) {
+                return NULL;
+        }
+
+        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_DESCR);
+        }
+        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_DESCR);
+        }
+
+        return NULL;
+}
+/* Get the interface description for a meta packet.
+ * Note: ERF packets can contain multiple interfaces per meta packet. Use index to
+ * specify the interface index.
+ *
+ * @params libtrace_packet_t meta packet to extract the interface description from.
+ * @params A pointer to a character buffer to store the interface description in.
+ * @params The size of the buffer passed in.
+ * @params The interface index within the meta packet.
+ * @returns Pointer to the character buffer containing the interface description or NULL.
+ */
+char *trace_get_interface_description(libtrace_packet_t *packet, char *space, int spacelen,
+        int index) {
+
+        libtrace_meta_t *r = trace_get_interface_description_meta(packet);
+        if (r == NULL) { return NULL; }
+        if (r->num <= index) { return NULL; }
+        if (r->items[index].len > spacelen) {
+                memcpy(space, r->items[index].data, spacelen);
+        } else {
+                memcpy(space, r->items[index].data, r->items[index].len);
+        }
+        trace_destroy_meta(r);
+        return space;
+}
+
+
+/* Get the host OS for a meta packet.
+ * Must be destroyed with trace_destroy_meta().
+ *
+ * @params libtrace_packet_t meta packet.
+ * @returns Pointer to libtrace_meta_t structure containing the host OS or NULL.
+ */
+libtrace_meta_t *trace_get_host_os_meta(libtrace_packet_t *packet) {
+        if (trace_meta_check_input(packet, "trace_get_host_os()")<0) {
+                return NULL;
+        }
+
+        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        ERF_PROV_SECTION_HOST, ERF_PROV_OS);
+        }
+        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_OS);
+        }
+
+        return NULL;
+}
+/* Get the host OS for a meta packet.
+ *
+ * @params libtrace_packet_t meta packet to extract the host OS from.
+ * @params A pointer to a character buffer to store the host OS in.
+ * @params The size of the buffer passed in.
+ * @returns Pointer to the character buffer containing the host OS or NULL.
+ */
+char *trace_get_host_os(libtrace_packet_t *packet, char *space, int spacelen) {
+        libtrace_meta_t *r = trace_get_host_os_meta(packet);
+        if (r == NULL) { return NULL; }
+        if (r->items[0].len > spacelen) {
+                memcpy(space, r->items[0].data, spacelen);
+        } else {
+                memcpy(space, r->items[0].data, r->items[0].len);
+        }
+        trace_destroy_meta(r);
+        return space;
+}
+
+/* Get the interface frame check sequence length for a meta packet.
+ * Must be destroyed with trace_destroy_meta().
+ *
+ * @params libtrace_packet_t meta packet.
+ * @returns Pointer to libtrace_meta_t structure containing all found frame check
+ * sequence lengths or NULL.
+ */
+libtrace_meta_t *trace_get_interface_fcslen_meta(libtrace_packet_t *packet) {
+        if (trace_meta_check_input(packet, "trace_get_interface_frame_check_sequence_length()")<0) {
+                return NULL;
+        }
+
+        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_FCS_LEN);
+        }
+        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_FCSLEN);
+        }
+
+        return NULL;
+}
+/* Get the interface frame check sequence length for a meta packet.
+ * Note: ERF packets can contain multiple interfaces per meta packet. Use index to
+ * specify the interface index.
+ *
+ * @params libtrace_packet_t meta packet to extract the interface fcslen from.
+ * @params The interface index within the meta packet.
+ * @returns uint32_t frame check sequence length or 0.
+ */
+uint32_t trace_get_interface_fcslen(libtrace_packet_t *packet, int index) {
+        libtrace_meta_t *r = trace_get_interface_fcslen_meta(packet);
+        if (r == NULL) { return 0; }
+        if (r->num <= index) { return 0; }
+        uint32_t data = *(uint32_t *)r->items[index].data;
+        trace_destroy_meta(r);
+        return data;
+}
+
+/* Get the hardware description
  * Must be destroyed with trace_destroy_meta()
  *
@@ -55 +449 @@
  * @returns Pointer to libtrace_meta_t structure or NULL
  */
-libtrace_meta_t *trace_get_interface_name(libtrace_packet_t *packet) {
-        if (trace_meta_check_input(packet, "trace_get_interface_name()")<0) {
-                return NULL;
-        }
-
-        /* get the result */
-        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_NAME);
-        }
-        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_NAME);
-        }
-
-        return NULL;
-}
-
-/* Get the interface MAC address/s
- * Must be destroyed with trace_destroy_meta()
- *
- * @params libtrace_packet_t meta packet
- * @returns Pointer to libtrace_meta_t structure or NULL
- */
-libtrace_meta_t *trace_get_interface_mac(libtrace_packet_t *packet) {
-        if (trace_meta_check_input(packet, "trace_get_interface_mac()")<0) {
-                return NULL;
-        }
-
-        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_IF_MAC);
-        }
-        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_MAC);
-        }
-
-        return NULL;
-}
-
-/* Get the interface speed/s from a meta packet
+libtrace_meta_t *trace_get_interface_hardware_description_meta(libtrace_packet_t *packet) {
+        if (trace_meta_check_input(packet, "trace_get_interface_hardware_description()")<0) {
+                return NULL;
+        }
+
+        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_HARDWARE);
+        }
+        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        ERF_PROV_SECTION_MODULE, ERF_PROV_MODEL);
+        }
+
+        return NULL;
+}
+/* Get the hardware description for a meta packet.
+ *
+ * @params libtrace_packet_t meta packet to extract the hardware description from.
+ * @params A pointer to a character buffer to store the hardware description in.
+ * @params The size of the buffer passed in.
+ * @returns Pointer to the character buffer containing the hardware description or NULL.
+ */
+char *trace_get_interface_hardware_description(libtrace_packet_t *packet, char *space,
+        int spacelen) {
+
+        libtrace_meta_t *r = trace_get_interface_hardware_description_meta(packet);
+        if (r == NULL) { return NULL; }
+        if (r->items[0].len > spacelen) {
+                memcpy(space, r->items[0].data, spacelen);
+        } else {
+                memcpy(space, r->items[0].data, r->items[0].len);
+        }
+        trace_destroy_meta(r);
+        return space;
+}
+
+/* Get any interface comments for a meta packet
  * Must be destroyed with trace_destroy_meta()
  *
@@ -102 +492 @@
  * @returns Pointer to libtrace_meta_t structure or NULL
  */
-libtrace_meta_t *trace_get_interface_speed(libtrace_packet_t *packet) {
-        if (trace_meta_check_input(packet, "trace_get_interface_speed()")<0) {
-                return NULL;
-        }
-
-        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_IF_SPEED);
-        }
-        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_SPEED);
-        }
-
-        return NULL;
-}
-
-/* Get the interface ipv4 address/s
- * Must be destroyed with trace_destroy_meta()
- *
- * @params libtrace_packet_t meta packet
- * @returns Pointer to libtrace_meta_t structure or NULL
- */
-libtrace_meta_t *trace_get_interface_ip4(libtrace_packet_t *packet) {
-        if (trace_meta_check_input(packet, "trace_get_interface_ip4()")<0) {
-                return NULL;
-        }
-
-        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_IF_IPV4);
-        }
-        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_IP4);
-        }
-
-        return NULL;
-}
-libtrace_meta_t *trace_get_interface_ipv4(libtrace_packet_t *packet) {
-        return trace_get_interface_ip4(packet);
-}
-
-/* Get the interface ipv6 address/s
- * Must be destroyed with trace_destroy_meta()
- *
- * @params libtrace_packet_t meta packet
- * @returns Pointer to libtrace_meta_t structure or NULL
- */
-libtrace_meta_t *trace_get_interface_ip6(libtrace_packet_t *packet) {
-        if (trace_meta_check_input(packet, "trace_get_interface_ip6()")<0) {
-                return NULL;
-        }
-
-        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_IF_IPV4);
-        }
-        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_IP4);
-        }
-
-        return NULL;
-}
-libtrace_meta_t *trace_get_interface_ipv6(libtrace_packet_t *packet) {
-        return trace_get_interface_ip6(packet);
-}
-
-/* Get the interface description/s
- * Must be destroyed with trace_destroy_meta()
- *
- * @params libtrace_packet_t meta packet
- * @returns Pointer to libtrace_meta_t structure or NULL
- */
-libtrace_meta_t *trace_get_interface_description(libtrace_packet_t *packet) {
-        if (trace_meta_check_input(packet, "trace_get_interface_description()")<0) {
-                return NULL;
-        }
-
-        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_DESCR);
-        }
-        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_DESCR);
-        }
-
-        return NULL;
-}
-
-/* Get the interface number/s
- * Must be destroyed with trace_destroy_meta()
- *
- * @params libtrace_packet_t meta packet
- * @returns Pointer to libtrace_meta_t structure or NULL
- */
-libtrace_meta_t *trace_get_interface_num(libtrace_packet_t *packet) {
-        if (trace_meta_check_input(packet, "trace_get_interface_num()")<0) {
-                return NULL;
-        }
-
-        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_IF_NUM);
-        }
-        /* Note: pcapng doesnt provide this */
-
-        return NULL;
-}
-
-/* Get the host OS
- * Must be destroyed with trace_destroy_meta()
- *
- * @params libtrace_packet_t meta packet
- * @returns Pointer to libtrace_meta_t structure or NULL
- */
-libtrace_meta_t *trace_get_host_os(libtrace_packet_t *packet) {
-        if (trace_meta_check_input(packet, "trace_get_host_os()")<0) {
-                return NULL;
-        }
-
-        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        ERF_PROV_SECTION_HOST, ERF_PROV_OS);
-        }
-        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_OS);
-        }
-
-        return NULL;
-}
-
-/* Get the frame check sequence length
- * Must be destroyed with trace_destroy_meta()
- *
- * @params libtrace_packet_t meta packet
- * @returns Pointer to libtrace_meta_t structure or NULL
- */
-libtrace_meta_t *trace_get_interface_frame_check_sequence_length(libtrace_packet_t *packet) {
-        if (trace_meta_check_input(packet, "trace_get_interface_frame_check_sequence_length()")<0) {
-                return NULL;
-        }
-
-        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_FCS_LEN);
-        }
-        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_FCSLEN);
-        }
-
-        return NULL;
-}
-
-/* Get the hardware description
- * Must be destroyed with trace_destroy_meta()
- *
- * @params libtrace_packet_t meta packet
- * @returns Pointer to libtrace_meta_t structure or NULL
- */
-libtrace_meta_t *trace_get_interface_hardware_description(libtrace_packet_t *packet) {
-        if (trace_meta_check_input(packet, "trace_get_interface_hardware_description()")<0) {
-                return NULL;
-        }
-
-        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        PCAPNG_INTERFACE_TYPE, PCAPNG_META_IF_HARDWARE);
-        }
-        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        ERF_PROV_SECTION_MODULE, ERF_PROV_MODEL);
-        }
-
-        return NULL;
-}
-
-/* Get any interface comments for a meta packet
+libtrace_meta_t *trace_get_interface_comment_meta(libtrace_packet_t *packet) {
+        if (trace_meta_check_input(packet, "trace_get_interface_comment()")<0) {
+                return NULL;
+        }
+
+        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_COMMENT);
+        }
+        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
+                return packet->trace->format->get_meta_section_option(packet,
+                        PCAPNG_INTERFACE_TYPE, PCAPNG_OPTION_COMMENT);
+        }
+
+        return NULL;
+}
+/* Get the interface comment for a meta packet.
+ * Note: ERF packets can contain multiple interfaces per meta packet. Use index to
+ * specify the interface ID.
+ *
+ * @params libtrace_packet_t meta packet to extract the interface comment from.
+ * @params A pointer to a character buffer to store the interface description in.
+ * @params The size of the buffer passed in.
+ * @params The interface number within the meta packet.
+ * @returns Pointer to the character buffer containing the hardware description or NULL.
+ */
+char *trace_get_interface_comment(libtrace_packet_t *packet, char *space, int spacelen,
+        int index) {
+
+        libtrace_meta_t *r = trace_get_interface_comment_meta(packet);
+        if (r == NULL) { return NULL; }
+        if (index > r->num) { return NULL; }
+        if (r->items[index].len > spacelen) {
+                memcpy(space, r->items[index].data, spacelen);
+        } else {
+                memcpy(space, r->items[index].data, r->items[index].len);
+        }
+        trace_destroy_meta(r);
+        return space;
+}
+
+/* Get the capture application for a meta packet
  * Must be destroyed with trace_destroy_meta()
  *
@@ -289 +539 @@
  * @returns Pointer to libtrace_meta_t structure or NULL
  */
-libtrace_meta_t *trace_get_interface_comment(libtrace_packet_t *packet) {
+libtrace_meta_t *trace_get_capture_application_meta(libtrace_packet_t *packet) {
         if (trace_meta_check_input(packet, "trace_get_interface_comment()")<0) {
                 return NULL;
@@ -295 +545 @@
 
         if (packet->trace->format->type == TRACE_FORMAT_ERF) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        ERF_PROV_SECTION_INTERFACE, ERF_PROV_COMMENT);
-        }
-        if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
-                return packet->trace->format->get_meta_section_item(packet,
-                        PCAPNG_INTERFACE_TYPE, PCAPNG_OPTION_COMMENT);
-        }
-
-        return NULL;
-}
-
-/* Get the capture application for a meta packet
- * Must be destroyed with trace_destroy_meta()
- *
- * @params libtrace_packet_t packet
- * @returns Pointer to libtrace_meta_t structure or NULL
- */
-libtrace_meta_t *trace_get_capture_application(libtrace_packet_t *packet) {
-        if (trace_meta_check_input(packet, "trace_get_interface_comment()")<0) {
-                return NULL;
-        }
-
-        if (packet->trace->format->type == TRACE_FORMAT_ERF) {
-                return packet->trace->format->get_meta_section_item(packet,
+                return packet->trace->format->get_meta_section_option(packet,
                         ERF_PROV_SECTION_CAPTURE, ERF_PROV_APP_NAME);
         }
         if (packet->trace->format->type == TRACE_FORMAT_PCAPNG) {
-                return packet->trace->format->get_meta_section_item(packet,
+                return packet->trace->format->get_meta_section_option(packet,
                         PCAPNG_SECTION_TYPE, PCAPNG_META_SHB_USERAPPL);
         }
@@ -328 +555 @@
         return NULL;
 }
-
-/* Get meta section option from a meta packet
+/* Get the capture application for a meta packet.
+ *
+ * @params libtrace_packet_t meta packet to extract the application name from.
+ * @params A pointer to a character buffer to store the application name in.
+ * @params The size of the buffer passed in.
+ * @returns Pointer to the character buffer containing the application name or NULL.
+ */
+char *trace_get_capture_application(libtrace_packet_t *packet, char *space, int spacelen) {
+        libtrace_meta_t *r = trace_get_capture_application_meta(packet);
+        if (r == NULL) { return NULL; }
+        if (r->items[0].len > spacelen) {
+                memcpy(space, r->items[0].data, spacelen);
+        } else {
+                memcpy(space, r->items[0].data, r->items[0].len);
+        }
+        trace_destroy_meta(r);
+        return space;
+}
+
+/* Get a meta section option from a meta packet
  * Must be destroyed with trace_destroy_meta()
  *
@@ -344 +589 @@
         }
 
-        return packet->trace->format->get_meta_section_item(packet,
+        return packet->trace->format->get_meta_section_option(packet,
                 section_code, option_code);
 }

lib/libtrace.h.in

@@ -3732 +3732 @@
 /*@}*/
 
+
+
+DLLEXPORT int trace_destroy_meta(libtrace_meta_t *result);
+
+DLLEXPORT libtrace_meta_t *trace_get_interface_name_meta(libtrace_packet_t *packet);
+
+DLLEXPORT char *trace_get_interface_name(libtrace_packet_t *packet, char *space, int spacelen,
+        int index);
+
+DLLEXPORT libtrace_meta_t *trace_get_interface_mac_meta(libtrace_packet_t *packet);
+
+DLLEXPORT char *trace_get_interface_mac(libtrace_packet_t *packet, char *space, int spacelen,
+        int index);
+
+DLLEXPORT libtrace_meta_t *trace_get_interface_speed_meta(libtrace_packet_t *packet);
+
+DLLEXPORT uint64_t trace_get_interface_speed(libtrace_packet_t *packet, int index);
+
+
+DLLEXPORT libtrace_meta_t *trace_get_interface_ipv4_meta(libtrace_packet_t *packet);
+
+DLLEXPORT uint32_t trace_get_interface_ipv4(libtrace_packet_t *packet, int index);
+
+DLLEXPORT char *trace_get_interface_ipv4_string(libtrace_packet_t *packet, char *space, int spacelen,
+        int index);
+
+DLLEXPORT libtrace_meta_t *trace_get_interface_ipv6_meta(libtrace_packet_t *packet);
+
+DLLEXPORT void *trace_get_interface_ipv6(libtrace_packet_t *packet, void *space, int spacelen,
+        int index);
+
+DLLEXPORT char *trace_get_interface_ipv6_string(libtrace_packet_t *packet, char *space, int spacelen,
+        int index);
+
+DLLEXPORT libtrace_meta_t *trace_get_interface_description_meta(libtrace_packet_t *packet);
+
+DLLEXPORT char *trace_get_interface_description(libtrace_packet_t *packet, char *space, int spacelen,
+
+        int index);
+
+DLLEXPORT libtrace_meta_t *trace_get_host_os_meta(libtrace_packet_t *packet);
+
+DLLEXPORT char *trace_get_host_os(libtrace_packet_t *packet, char *space, int spacelen);
+
+DLLEXPORT libtrace_meta_t *trace_get_interface_fcslen_meta(libtrace_packet_t *packet);
+
+DLLEXPORT uint32_t trace_get_interface_fcslen(libtrace_packet_t *packet, int index);
+
+DLLEXPORT libtrace_meta_t *trace_get_interface_hardware_description_meta(libtrace_packet_t *packet);
+
+DLLEXPORT char *trace_get_interface_hardware_description(libtrace_packet_t *packet, char *space,
+        int spacelen);
+
+DLLEXPORT libtrace_meta_t *trace_get_interface_comment_meta(libtrace_packet_t *packet);
+
+DLLEXPORT char *trace_get_interface_comment(libtrace_packet_t *packet, char *space, int spacelen,
+        int index);
+
+DLLEXPORT libtrace_meta_t *trace_get_capture_application_meta(libtrace_packet_t *packet);
+
+DLLEXPORT char *trace_get_capture_application(libtrace_packet_t *packet, char *space, int spacelen);
+
+DLLEXPORT libtrace_meta_t *trace_get_section_option(libtrace_packet_t *packet, uint32_t section_code,
+        uint16_t option_code);
+
+DLLEXPORT libtrace_meta_t *trace_get_section(libtrace_packet_t *packet, uint32_t section_code);
+
+
 #ifdef __cplusplus
 } /* extern "C" */
 #endif /* #ifdef __cplusplus */
 
-int trace_destroy_meta(libtrace_meta_t *result);
-libtrace_meta_t *trace_get_interface_name(libtrace_packet_t *packet);
-libtrace_meta_t *trace_get_interface_mac(libtrace_packet_t *packet);
-libtrace_meta_t *trace_get_interface_speed(libtrace_packet_t *packet);
-libtrace_meta_t *trace_get_interface_ip4(libtrace_packet_t *packet);
-libtrace_meta_t *trace_get_interface_ipv4(libtrace_packet_t *packet);
-libtrace_meta_t *trace_get_interface_ip6(libtrace_packet_t *packet);
-libtrace_meta_t *trace_get_interface_ipv6(libtrace_packet_t *packet);
-libtrace_meta_t *trace_get_interface_description(libtrace_packet_t *packet);
-libtrace_meta_t *trace_get_interface_num(libtrace_packet_t *packet);
-libtrace_meta_t *trace_get_host_os(libtrace_packet_t *packet);
-libtrace_meta_t *trace_get_interface_frame_check_sequence_length(libtrace_packet_t *packet);
-libtrace_meta_t *trace_get_interface_hardware_description(libtrace_packet_t *packet);
-libtrace_meta_t *trace_get_interface_comment(libtrace_packet_t *packet);
-libtrace_meta_t *trace_get_capture_application(libtrace_packet_t *packet);
-libtrace_meta_t *trace_get_section_option(libtrace_packet_t *packet, uint32_t section_code,
-        uint16_t option_code);
-libtrace_meta_t *trace_get_section(libtrace_packet_t *packet, uint32_t section_code);
-
 #endif /* LIBTRACE_H_ */

lib/libtrace_int.h

@@ -725 +725 @@
         /**
          */
-        void *(*get_meta_section)(libtrace_packet_t *packet, uint32_t section_type);
-        void *(*get_meta_section_item)(libtrace_packet_t *packet, uint32_t section_type,
-                uint16_t section);
+        void *(*get_meta_section)(libtrace_packet_t *packet, uint32_t section);
+        void *(*get_meta_section_option)(libtrace_packet_t *packet, uint32_t section,
+                uint16_t option);
 
         /** Moves the read pointer to a certain ERF timestamp within an input