pflog: use nd_ types in struct pfloghdr.

This 1) makes sure that GET_ macros are used to extract data from the
structure (which they already were) and 2) avoids undefined behavior if
the structure isn't aligned on the appropriate memory boundary.

Fixes #1054.  (The SNMP issues are fixed by changes for #1012.)

diff --git a/pflog.h b/pflog.h
index a629ebabf3c180ac59e9030f4fcc6e6fdc25dd39..6680b4246697b052a042b23c39e079f3009d5cbb 100644 (file)
--- a/pflog.h
+++ b/pflog.h
@@ -115,35 +115,35 @@ struct pf_addr {
 };
 
 struct pfloghdr {
-       uint8_t         length;
-       uint8_t         af;
-       uint8_t         action;
-       uint8_t         reason;
+       nd_uint8_t      length;
+       nd_uint8_t      af;
+       nd_uint8_t      action;
+       nd_uint8_t      reason;
        char            ifname[PFLOG_IFNAMSIZ];
        char            ruleset[PFLOG_RULESET_NAME_SIZE];
-       uint32_t        rulenr;
-       uint32_t        subrulenr;
-       uint32_t        uid;
-       int32_t         pid;
-       uint32_t        rule_uid;
-       int32_t         rule_pid;
-       uint8_t         dir;
+       nd_uint32_t     rulenr;
+       nd_uint32_t     subrulenr;
+       nd_uint32_t     uid;
+       nd_int32_t      pid;
+       nd_uint32_t     rule_uid;
+       nd_int32_t      rule_pid;
+       nd_uint8_t      dir;
 #if defined(__OpenBSD__)
-       uint8_t         rewritten;
-       uint8_t         naf;
-       uint8_t         pad[1];
+       nd_uint8_t      rewritten;
+       nd_uint8_t      naf;
+       nd_uint8_t      pad[1];
 #else
-       uint8_t         pad[3];
+       nd_uint8_t      pad[3];
 #endif
 #if defined(__FreeBSD__)
-       uint32_t        ridentifier;
-       uint8_t         reserve;
-       uint8_t         pad2[3];
+       nd_uint32_t     ridentifier;
+       nd_uint8_t      reserve;
+       nd_uint8_t      pad2[3];
 #elif defined(__OpenBSD__)
        struct pf_addr  saddr;
        struct pf_addr  daddr;
-       uint16_t        sport;
-       uint16_t        dport;
+       nd_uint16_t     sport;
+       nd_uint16_t     dport;
 #endif
 };
 

diff --git a/print-pflog.c b/print-pflog.c
index f7772af62c20d624746577025ce02d92206d421d..4081135340ae6521a014000baf9b8b9a029cf558 100644 (file)
--- a/print-pflog.c
+++ b/print-pflog.c
@@ -106,8 +106,8 @@ pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr)
        uint32_t rulenr, subrulenr;
 
        ndo->ndo_protocol = "pflog";
-       rulenr = GET_BE_U_4(&hdr->rulenr);
-       subrulenr = GET_BE_U_4(&hdr->subrulenr);
+       rulenr = GET_BE_U_4(hdr->rulenr);
+       subrulenr = GET_BE_U_4(hdr->subrulenr);
        if (subrulenr == (uint32_t)-1)
                ND_PRINT("rule %u/", rulenr);
        else {
@@ -117,9 +117,9 @@ pflog_print(netdissect_options *ndo, const struct pfloghdr *hdr)
        }
 
        ND_PRINT("%s: %s %s on ",
-           tok2str(pf_reasons, "unkn(%u)", GET_U_1(&hdr->reason)),
-           tok2str(pf_actions, "unkn(%u)", GET_U_1(&hdr->action)),
-           tok2str(pf_directions, "unkn(%u)", GET_U_1(&hdr->dir)));
+           tok2str(pf_reasons, "unkn(%u)", GET_U_1(hdr->reason)),
+           tok2str(pf_actions, "unkn(%u)", GET_U_1(hdr->action)),
+           tok2str(pf_directions, "unkn(%u)", GET_U_1(hdr->dir)));
        nd_printjnp(ndo, (const u_char*)hdr->ifname, PFLOG_IFNAMSIZ);
        ND_PRINT(": ");
 }
@@ -144,12 +144,13 @@ pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
 
 #define MIN_PFLOG_HDRLEN       45
        hdr = (const struct pfloghdr *)p;
-       if (GET_U_1(&hdr->length) < MIN_PFLOG_HDRLEN) {
+       hdrlen = GET_U_1(hdr->length);
+       if (hdrlen < MIN_PFLOG_HDRLEN) {
                ND_PRINT("[pflog: invalid header length!]");
-               ndo->ndo_ll_hdr_len += GET_U_1(&hdr->length);   /* XXX: not really */
+               ndo->ndo_ll_hdr_len += hdrlen;  /* XXX: not really */
                return;
        }
-       hdrlen = roundup2(hdr->length, 4);
+       hdrlen = roundup2(hdrlen, 4);
 
        if (caplen < hdrlen) {
                nd_print_trunc(ndo);
@@ -163,7 +164,7 @@ pflog_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
                pflog_print(ndo, hdr);
 
        /* skip to the real packet */
-       af = GET_U_1(&hdr->af);
+       af = GET_U_1(hdr->af);
        length -= hdrlen;
        caplen -= hdrlen;
        p += hdrlen;