Decode msghdr argument of sendmsg() and recvmsg().
Sponsored by: Netflix, Inc.
This commit is contained in:
Michael Tuexen
parent
0faae8b922
commit
a2674e031c
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=328015
@ -82,7 +82,7 @@ enum Argtype { None = 1, Hex, Octal, Int, UInt, LongHex, Name, Ptr, Stat, Stat11
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Sockoptname, Msgflags, CapRights, PUInt, PQuadHex, Acltype,
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Extattrnamespace, Minherit, Mlockall, Mountflags, Msync, Priowhich,
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Ptraceop, Quotactlcmd, Reboothowto, Rtpriofunc, Schedpolicy, Schedparam,
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PSig, Siginfo, Kevent11, Iovec, Sctpsndrcvinfo,
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PSig, Siginfo, Kevent11, Iovec, Sctpsndrcvinfo, Msghdr,
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CloudABIAdvice, CloudABIClockID, ClouduABIFDSFlags,
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CloudABIFDStat, CloudABIFileStat, CloudABIFileType,
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@ -401,7 +401,7 @@ static struct syscall decoded_syscalls[] = {
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{ Msgflags, 3 }, { Sockaddr | OUT, 4 },
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{ Ptr | OUT, 5 } } },
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{ .name = "recvmsg", .ret_type = 1, .nargs = 3,
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.args = { { Int, 0 }, { Ptr, 1 }, { Msgflags, 2 } } },
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.args = { { Int, 0 }, { Msghdr | OUT, 1 }, { Msgflags, 2 } } },
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{ .name = "rename", .ret_type = 1, .nargs = 2,
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.args = { { Name, 0 }, { Name, 1 } } },
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{ .name = "renameat", .ret_type = 1, .nargs = 4,
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@ -444,7 +444,7 @@ static struct syscall decoded_syscalls[] = {
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.args = { { Int, 0 }, { Fd_set, 1 }, { Fd_set, 2 }, { Fd_set, 3 },
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{ Timeval, 4 } } },
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{ .name = "sendmsg", .ret_type = 1, .nargs = 3,
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.args = { { Int, 0 }, { Ptr, 1 }, { Msgflags, 2 } } },
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.args = { { Int, 0 }, { Msghdr | IN, 1 }, { Msgflags, 2 } } },
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{ .name = "sendto", .ret_type = 1, .nargs = 6,
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.args = { { Int, 0 }, { BinString | IN, 1 }, { Sizet, 2 },
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{ Msgflags, 3 }, { Sockaddr | IN, 4 },
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@ -1159,6 +1159,378 @@ print_utrace(FILE *fp, void *utrace_addr, size_t len)
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fprintf(fp, " }");
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}
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static void
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print_sockaddr(FILE *fp, struct trussinfo *trussinfo, void *arg, socklen_t len)
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{
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char addr[64];
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struct sockaddr_in *lsin;
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struct sockaddr_in6 *lsin6;
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struct sockaddr_un *sun;
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struct sockaddr *sa;
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u_char *q;
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pid_t pid = trussinfo->curthread->proc->pid;
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if (arg == NULL) {
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fputs("NULL", fp);
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return;
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}
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/* If the length is too small, just bail. */
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if (len < sizeof(*sa)) {
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fprintf(fp, "0x%p", arg);
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return;
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}
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sa = calloc(1, len);
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if (get_struct(pid, arg, sa, len) == -1) {
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free(sa);
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fprintf(fp, "0x%p", arg);
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return;
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}
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switch (sa->sa_family) {
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case AF_INET:
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if (len < sizeof(*lsin))
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goto sockaddr_short;
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lsin = (struct sockaddr_in *)(void *)sa;
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inet_ntop(AF_INET, &lsin->sin_addr, addr, sizeof(addr));
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fprintf(fp, "{ AF_INET %s:%d }", addr,
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htons(lsin->sin_port));
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break;
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case AF_INET6:
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if (len < sizeof(*lsin6))
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goto sockaddr_short;
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lsin6 = (struct sockaddr_in6 *)(void *)sa;
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inet_ntop(AF_INET6, &lsin6->sin6_addr, addr,
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sizeof(addr));
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fprintf(fp, "{ AF_INET6 [%s]:%d }", addr,
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htons(lsin6->sin6_port));
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break;
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case AF_UNIX:
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sun = (struct sockaddr_un *)sa;
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fprintf(fp, "{ AF_UNIX \"%.*s\" }",
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(int)(len - offsetof(struct sockaddr_un, sun_path)),
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sun->sun_path);
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break;
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default:
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sockaddr_short:
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fprintf(fp,
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"{ sa_len = %d, sa_family = %d, sa_data = {",
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(int)sa->sa_len, (int)sa->sa_family);
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for (q = (u_char *)sa->sa_data;
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q < (u_char *)sa + len; q++)
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fprintf(fp, "%s 0x%02x",
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q == (u_char *)sa->sa_data ? "" : ",",
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*q);
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fputs(" } }", fp);
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}
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free(sa);
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}
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#define IOV_LIMIT 16
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static void
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print_iovec(FILE *fp, struct trussinfo *trussinfo, void *arg, int iovcnt)
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{
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struct iovec iov[IOV_LIMIT];
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size_t max_string = trussinfo->strsize;
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char tmp2[max_string + 1], *tmp3;
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size_t len;
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pid_t pid = trussinfo->curthread->proc->pid;
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int i;
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bool buf_truncated, iov_truncated;
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if (iovcnt <= 0) {
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fprintf(fp, "0x%p", arg);
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return;
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}
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if (iovcnt > IOV_LIMIT) {
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iovcnt = IOV_LIMIT;
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iov_truncated = true;
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} else {
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iov_truncated = false;
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}
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if (get_struct(pid, arg, &iov, iovcnt * sizeof(struct iovec)) == -1) {
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fprintf(fp, "0x%p", arg);
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return;
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}
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fputs("[", fp);
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for (i = 0; i < iovcnt; i++) {
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len = iov[i].iov_len;
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if (len > max_string) {
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len = max_string;
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buf_truncated = true;
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} else {
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buf_truncated = false;
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}
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fprintf(fp, "%s{", (i > 0) ? "," : "");
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if (len && get_struct(pid, iov[i].iov_base, &tmp2, len) != -1) {
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tmp3 = malloc(len * 4 + 1);
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while (len) {
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if (strvisx(tmp3, tmp2, len,
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VIS_CSTYLE|VIS_TAB|VIS_NL) <=
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(int)max_string)
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break;
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len--;
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buf_truncated = true;
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}
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fprintf(fp, "\"%s\"%s", tmp3,
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buf_truncated ? "..." : "");
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free(tmp3);
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} else {
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fprintf(fp, "0x%p", iov[i].iov_base);
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}
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fprintf(fp, ",%zu}", iov[i].iov_len);
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}
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fprintf(fp, "%s%s", iov_truncated ? ",..." : "", "]");
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}
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static void
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print_gen_cmsg(FILE *fp, struct cmsghdr *cmsghdr)
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{
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u_char *q;
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fputs("{", fp);
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for (q = CMSG_DATA(cmsghdr);
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q < (u_char *)cmsghdr + cmsghdr->cmsg_len; q++) {
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fprintf(fp, "%s0x%02x", q == CMSG_DATA(cmsghdr) ? "" : ",", *q);
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}
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fputs("}", fp);
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}
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static void
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print_sctp_initmsg(FILE *fp, struct sctp_initmsg *init)
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{
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fprintf(fp, "{out=%u,", init->sinit_num_ostreams);
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fprintf(fp, "in=%u,", init->sinit_max_instreams);
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fprintf(fp, "max_rtx=%u,", init->sinit_max_attempts);
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fprintf(fp, "max_rto=%u}", init->sinit_max_init_timeo);
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}
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static void
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print_sctp_sndrcvinfo(FILE *fp, bool recv, struct sctp_sndrcvinfo *info)
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{
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fprintf(fp, "{sid=%u,", info->sinfo_stream);
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if (recv) {
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fprintf(fp, "ssn=%u,", info->sinfo_ssn);
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}
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fputs("flgs=", fp);
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sysdecode_sctp_sinfo_flags(fp, info->sinfo_flags);
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fprintf(fp, ",ppid=%u,", ntohl(info->sinfo_ppid));
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if (!recv) {
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fprintf(fp, "ctx=%u,", info->sinfo_context);
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fprintf(fp, "ttl=%u,", info->sinfo_timetolive);
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}
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if (recv) {
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fprintf(fp, "tsn=%u,", info->sinfo_tsn);
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fprintf(fp, "cumtsn=%u,", info->sinfo_cumtsn);
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}
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fprintf(fp, "id=%u}", info->sinfo_assoc_id);
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}
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static void
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print_sctp_sndinfo(FILE *fp, struct sctp_sndinfo *info)
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{
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fprintf(fp, "{sid=%u,", info->snd_sid);
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fputs("flgs=", fp);
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print_mask_arg(sysdecode_sctp_snd_flags, fp, info->snd_flags);
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fprintf(fp, ",ppid=%u,", ntohl(info->snd_ppid));
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fprintf(fp, "ctx=%u,", info->snd_context);
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fprintf(fp, "id=%u}", info->snd_assoc_id);
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}
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static void
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print_sctp_rcvinfo(FILE *fp, struct sctp_rcvinfo *info)
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{
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fprintf(fp, "{sid=%u,", info->rcv_sid);
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fprintf(fp, "ssn=%u,", info->rcv_ssn);
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fputs("flgs=", fp);
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print_mask_arg(sysdecode_sctp_rcv_flags, fp, info->rcv_flags);
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fprintf(fp, ",ppid=%u,", ntohl(info->rcv_ppid));
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fprintf(fp, "tsn=%u,", info->rcv_tsn);
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fprintf(fp, "cumtsn=%u,", info->rcv_cumtsn);
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fprintf(fp, "ctx=%u,", info->rcv_context);
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fprintf(fp, "id=%u}", info->rcv_assoc_id);
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}
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static void
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print_sctp_nxtinfo(FILE *fp, struct sctp_nxtinfo *info)
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{
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fprintf(fp, "{sid=%u,", info->nxt_sid);
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fputs("flgs=", fp);
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print_mask_arg(sysdecode_sctp_nxt_flags, fp, info->nxt_flags);
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fprintf(fp, ",ppid=%u,", ntohl(info->nxt_ppid));
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fprintf(fp, "len=%u,", info->nxt_length);
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fprintf(fp, "id=%u}", info->nxt_assoc_id);
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}
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static void
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print_sctp_prinfo(FILE *fp, struct sctp_prinfo *info)
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{
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fputs("{pol=", fp);
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print_integer_arg(sysdecode_sctp_pr_policy, fp, info->pr_policy);
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fprintf(fp, ",val=%u}", info->pr_value);
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}
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static void
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print_sctp_authinfo(FILE *fp, struct sctp_authinfo *info)
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{
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fprintf(fp, "{num=%u}", info->auth_keynumber);
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}
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static void
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print_sctp_ipv4_addr(FILE *fp, struct in_addr *addr)
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{
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char buf[INET_ADDRSTRLEN];
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const char *s;
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s = inet_ntop(AF_INET, addr, buf, INET_ADDRSTRLEN);
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if (s != NULL)
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fprintf(fp, "{addr=%s}", s);
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else
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fputs("{addr=???}", fp);
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}
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static void
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print_sctp_ipv6_addr(FILE *fp, struct in6_addr *addr)
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{
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char buf[INET6_ADDRSTRLEN];
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const char *s;
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s = inet_ntop(AF_INET6, addr, buf, INET6_ADDRSTRLEN);
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if (s != NULL)
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fprintf(fp, "{addr=%s}", s);
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else
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fputs("{addr=???}", fp);
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}
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static void
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print_sctp_cmsg(FILE *fp, bool recv, struct cmsghdr *cmsghdr)
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{
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void *data;
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socklen_t len;
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len = cmsghdr->cmsg_len;
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data = CMSG_DATA(cmsghdr);
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switch (cmsghdr->cmsg_type) {
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case SCTP_INIT:
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if (len == CMSG_LEN(sizeof(struct sctp_initmsg)))
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print_sctp_initmsg(fp, (struct sctp_initmsg *)data);
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else
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print_gen_cmsg(fp, cmsghdr);
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break;
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case SCTP_SNDRCV:
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if (len == CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
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print_sctp_sndrcvinfo(fp, recv,
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(struct sctp_sndrcvinfo *)data);
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else
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print_gen_cmsg(fp, cmsghdr);
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break;
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#if 0
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case SCTP_EXTRCV:
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if (len == CMSG_LEN(sizeof(struct sctp_extrcvinfo)))
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print_sctp_extrcvinfo(fp,
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(struct sctp_extrcvinfo *)data);
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else
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print_gen_cmsg(fp, cmsghdr);
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break;
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#endif
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case SCTP_SNDINFO:
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if (len == CMSG_LEN(sizeof(struct sctp_sndinfo)))
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print_sctp_sndinfo(fp, (struct sctp_sndinfo *)data);
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else
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print_gen_cmsg(fp, cmsghdr);
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break;
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case SCTP_RCVINFO:
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if (len == CMSG_LEN(sizeof(struct sctp_rcvinfo)))
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print_sctp_rcvinfo(fp, (struct sctp_rcvinfo *)data);
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else
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print_gen_cmsg(fp, cmsghdr);
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break;
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case SCTP_NXTINFO:
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if (len == CMSG_LEN(sizeof(struct sctp_nxtinfo)))
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print_sctp_nxtinfo(fp, (struct sctp_nxtinfo *)data);
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else
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print_gen_cmsg(fp, cmsghdr);
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break;
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case SCTP_PRINFO:
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if (len == CMSG_LEN(sizeof(struct sctp_prinfo)))
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print_sctp_prinfo(fp, (struct sctp_prinfo *)data);
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else
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print_gen_cmsg(fp, cmsghdr);
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break;
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case SCTP_AUTHINFO:
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if (len == CMSG_LEN(sizeof(struct sctp_authinfo)))
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print_sctp_authinfo(fp, (struct sctp_authinfo *)data);
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else
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print_gen_cmsg(fp, cmsghdr);
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break;
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case SCTP_DSTADDRV4:
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if (len == CMSG_LEN(sizeof(struct in_addr)))
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print_sctp_ipv4_addr(fp, (struct in_addr *)data);
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else
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print_gen_cmsg(fp, cmsghdr);
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break;
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case SCTP_DSTADDRV6:
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if (len == CMSG_LEN(sizeof(struct in6_addr)))
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print_sctp_ipv6_addr(fp, (struct in6_addr *)data);
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else
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print_gen_cmsg(fp, cmsghdr);
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break;
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default:
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print_gen_cmsg(fp, cmsghdr);
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}
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}
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static void
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print_cmsgs(FILE *fp, pid_t pid, bool recv, struct msghdr *msghdr)
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{
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struct cmsghdr *cmsghdr;
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char *cmsgbuf;
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const char *temp;
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socklen_t len;
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int level, type;
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bool first;
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len = msghdr->msg_controllen;
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cmsgbuf = calloc(1, len);
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if (get_struct(pid, msghdr->msg_control, cmsgbuf, len) == -1) {
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fprintf(fp, "0x%p", msghdr);
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free(cmsgbuf);
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}
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msghdr->msg_control = cmsgbuf;
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first = true;
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fputs("{", fp);
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for (cmsghdr = CMSG_FIRSTHDR(msghdr);
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cmsghdr != NULL;
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cmsghdr = CMSG_NXTHDR(msghdr, cmsghdr)) {
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level = cmsghdr->cmsg_level;
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type = cmsghdr->cmsg_type;
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len = cmsghdr->cmsg_len;
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fprintf(fp, "%s{level=", first ? "" : ",");
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print_integer_arg(sysdecode_sockopt_level, fp, level);
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fputs(",type=", fp);
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temp = sysdecode_cmsg_type(level, type);
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if (temp) {
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fputs(temp, fp);
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} else {
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fprintf(fp, "%d", type);
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}
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fputs(",data=", fp);
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switch (level) {
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case IPPROTO_SCTP:
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print_sctp_cmsg(fp, recv, cmsghdr);
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break;
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default:
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print_gen_cmsg(fp, cmsghdr);
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break;
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}
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fputs("}", fp);
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}
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fputs("}", fp);
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free(cmsgbuf);
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}
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/*
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* Converts a syscall argument into a string. Said string is
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* allocated via malloc(), so needs to be free()'d. sc is
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@ -1613,13 +1985,7 @@ print_arg(struct syscall_args *sc, unsigned long *args, long *retval,
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print_mask_arg(sysdecode_rfork_flags, fp, args[sc->offset]);
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break;
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case Sockaddr: {
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char addr[64];
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struct sockaddr_in *lsin;
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struct sockaddr_in6 *lsin6;
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struct sockaddr_un *sun;
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struct sockaddr *sa;
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socklen_t len;
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u_char *q;
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if (args[sc->offset] == 0) {
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fputs("NULL", fp);
|
||||
@ -1641,56 +2007,7 @@ print_arg(struct syscall_args *sc, unsigned long *args, long *retval,
|
||||
} else
|
||||
len = args[sc->offset + 1];
|
||||
|
||||
/* If the length is too small, just bail. */
|
||||
if (len < sizeof(*sa)) {
|
||||
fprintf(fp, "0x%lx", args[sc->offset]);
|
||||
break;
|
||||
}
|
||||
|
||||
sa = calloc(1, len);
|
||||
if (get_struct(pid, (void *)args[sc->offset], sa, len) == -1) {
|
||||
free(sa);
|
||||
fprintf(fp, "0x%lx", args[sc->offset]);
|
||||
break;
|
||||
}
|
||||
|
||||
switch (sa->sa_family) {
|
||||
case AF_INET:
|
||||
if (len < sizeof(*lsin))
|
||||
goto sockaddr_short;
|
||||
lsin = (struct sockaddr_in *)(void *)sa;
|
||||
inet_ntop(AF_INET, &lsin->sin_addr, addr, sizeof(addr));
|
||||
fprintf(fp, "{ AF_INET %s:%d }", addr,
|
||||
htons(lsin->sin_port));
|
||||
break;
|
||||
case AF_INET6:
|
||||
if (len < sizeof(*lsin6))
|
||||
goto sockaddr_short;
|
||||
lsin6 = (struct sockaddr_in6 *)(void *)sa;
|
||||
inet_ntop(AF_INET6, &lsin6->sin6_addr, addr,
|
||||
sizeof(addr));
|
||||
fprintf(fp, "{ AF_INET6 [%s]:%d }", addr,
|
||||
htons(lsin6->sin6_port));
|
||||
break;
|
||||
case AF_UNIX:
|
||||
sun = (struct sockaddr_un *)sa;
|
||||
fprintf(fp, "{ AF_UNIX \"%.*s\" }",
|
||||
(int)(len - offsetof(struct sockaddr_un, sun_path)),
|
||||
sun->sun_path);
|
||||
break;
|
||||
default:
|
||||
sockaddr_short:
|
||||
fprintf(fp,
|
||||
"{ sa_len = %d, sa_family = %d, sa_data = {",
|
||||
(int)sa->sa_len, (int)sa->sa_family);
|
||||
for (q = (u_char *)sa->sa_data;
|
||||
q < (u_char *)sa + len; q++)
|
||||
fprintf(fp, "%s 0x%02x",
|
||||
q == (u_char *)sa->sa_data ? "" : ",",
|
||||
*q);
|
||||
fputs(" } }", fp);
|
||||
}
|
||||
free(sa);
|
||||
print_sockaddr(fp, trussinfo, (void *)args[sc->offset], len);
|
||||
break;
|
||||
}
|
||||
case Sigaction: {
|
||||
@ -2148,68 +2465,15 @@ print_arg(struct syscall_args *sc, unsigned long *args, long *retval,
|
||||
fprintf(fp, "0x%lx", args[sc->offset]);
|
||||
break;
|
||||
}
|
||||
#define IOV_LIMIT 16
|
||||
case Iovec: {
|
||||
case Iovec:
|
||||
/*
|
||||
* Print argument as an array of struct iovec, where the next
|
||||
* syscall argument is the number of elements of the array.
|
||||
*/
|
||||
struct iovec iov[IOV_LIMIT];
|
||||
size_t max_string = trussinfo->strsize;
|
||||
char tmp2[max_string + 1], *tmp3;
|
||||
size_t len;
|
||||
int i, iovcnt;
|
||||
bool buf_truncated, iov_truncated;
|
||||
|
||||
iovcnt = args[sc->offset + 1];
|
||||
if (iovcnt <= 0) {
|
||||
fprintf(fp, "0x%lx", args[sc->offset]);
|
||||
break;
|
||||
}
|
||||
if (iovcnt > IOV_LIMIT) {
|
||||
iovcnt = IOV_LIMIT;
|
||||
iov_truncated = true;
|
||||
} else {
|
||||
iov_truncated = false;
|
||||
}
|
||||
if (get_struct(pid, (void *)args[sc->offset],
|
||||
&iov, iovcnt * sizeof(struct iovec)) == -1) {
|
||||
fprintf(fp, "0x%lx", args[sc->offset]);
|
||||
break;
|
||||
}
|
||||
|
||||
fprintf(fp, "%s", "[");
|
||||
for (i = 0; i < iovcnt; i++) {
|
||||
len = iov[i].iov_len;
|
||||
if (len > max_string) {
|
||||
len = max_string;
|
||||
buf_truncated = true;
|
||||
} else {
|
||||
buf_truncated = false;
|
||||
}
|
||||
fprintf(fp, "%s{", (i > 0) ? "," : "");
|
||||
if (len && get_struct(pid, iov[i].iov_base, &tmp2, len)
|
||||
!= -1) {
|
||||
tmp3 = malloc(len * 4 + 1);
|
||||
while (len) {
|
||||
if (strvisx(tmp3, tmp2, len,
|
||||
VIS_CSTYLE|VIS_TAB|VIS_NL) <=
|
||||
(int)max_string)
|
||||
break;
|
||||
len--;
|
||||
buf_truncated = true;
|
||||
}
|
||||
fprintf(fp, "\"%s\"%s", tmp3,
|
||||
buf_truncated ? "..." : "");
|
||||
free(tmp3);
|
||||
} else {
|
||||
fprintf(fp, "0x%p", iov[i].iov_base);
|
||||
}
|
||||
fprintf(fp, ",%zu}", iov[i].iov_len);
|
||||
}
|
||||
fprintf(fp, "%s%s", iov_truncated ? ",..." : "", "]");
|
||||
print_iovec(fp, trussinfo, (void *)args[sc->offset],
|
||||
(int)args[sc->offset + 1]);
|
||||
break;
|
||||
}
|
||||
case Sctpsndrcvinfo: {
|
||||
struct sctp_sndrcvinfo info;
|
||||
|
||||
@ -2218,23 +2482,26 @@ print_arg(struct syscall_args *sc, unsigned long *args, long *retval,
|
||||
fprintf(fp, "0x%lx", args[sc->offset]);
|
||||
break;
|
||||
}
|
||||
fprintf(fp, "{sid=%u,", info.sinfo_stream);
|
||||
if (sc->type & OUT) {
|
||||
fprintf(fp, "ssn=%u,", info.sinfo_ssn);
|
||||
print_sctp_sndrcvinfo(fp, sc->type & OUT, &info);
|
||||
break;
|
||||
}
|
||||
case Msghdr: {
|
||||
struct msghdr msghdr;
|
||||
|
||||
if (get_struct(pid, (void *)args[sc->offset],
|
||||
&msghdr, sizeof(struct msghdr)) == -1) {
|
||||
fprintf(fp, "0x%lx", args[sc->offset]);
|
||||
break;
|
||||
}
|
||||
fputs("flgs=", fp);
|
||||
sysdecode_sctp_sinfo_flags(fp, info.sinfo_flags);
|
||||
fprintf(fp, ",ppid=%u,", ntohl(info.sinfo_ppid));
|
||||
/* Can't use IN here, since IN is 0 */
|
||||
if ((sc->type & OUT) == 0) {
|
||||
fprintf(fp, "ctx=%u,", info.sinfo_context);
|
||||
fprintf(fp, "ttl=%u,", info.sinfo_timetolive);
|
||||
}
|
||||
if (sc->type & OUT) {
|
||||
fprintf(fp, "tsn=%u,", info.sinfo_tsn);
|
||||
fprintf(fp, "cumtsn=%u,", info.sinfo_cumtsn);
|
||||
}
|
||||
fprintf(fp, "id=%u}", info.sinfo_assoc_id);
|
||||
fputs("{", fp);
|
||||
print_sockaddr(fp, trussinfo, msghdr.msg_name, msghdr.msg_namelen);
|
||||
fprintf(fp, ",%d,", msghdr.msg_namelen);
|
||||
print_iovec(fp, trussinfo, msghdr.msg_iov, msghdr.msg_iovlen);
|
||||
fprintf(fp, ",%d,", msghdr.msg_iovlen);
|
||||
print_cmsgs(fp, pid, sc->type & OUT, &msghdr);
|
||||
fprintf(fp, ",%u,", msghdr.msg_controllen);
|
||||
print_mask_arg(sysdecode_msg_flags, fp, msghdr.msg_flags);
|
||||
fputs("}", fp);
|
||||
break;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user