/*      $OpenBSD: clnt_perror.c,v 1.25 2019/07/03 03:24:04 deraadt Exp $ */

/*
 * Copyright (c) 2010, Oracle America, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *     * Neither the name of the "Oracle America, Inc." nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 *   COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 *   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 *   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <rpc/rpc.h>
#include <rpc/types.h>
#include <rpc/auth.h>
#include <rpc/clnt.h>

static char *auth_errmsg(enum auth_stat stat);
#define CLNT_PERROR_BUFLEN 256

static char buf[CLNT_PERROR_BUFLEN];

/*
 * Print reply error info
 */
char *
clnt_sperror(CLIENT *rpch, char *s)
{
        char *err, *str = buf;
        struct rpc_err e;
        int ret, len = CLNT_PERROR_BUFLEN;

        CLNT_GETERR(rpch, &e);

        ret = snprintf(str, len, "%s: %s", s, clnt_sperrno(e.re_status));
        if (ret < 0)
                ret = 0;
        else if (ret >= len)
                goto truncated;
        str += ret;
        len -= ret;

        switch (e.re_status) {
        case RPC_SUCCESS:
        case RPC_CANTENCODEARGS:
        case RPC_CANTDECODERES:
        case RPC_TIMEDOUT:
        case RPC_PROGUNAVAIL:
        case RPC_PROCUNAVAIL:
        case RPC_CANTDECODEARGS:
        case RPC_SYSTEMERROR:
        case RPC_UNKNOWNHOST:
        case RPC_UNKNOWNPROTO:
        case RPC_PMAPFAILURE:
        case RPC_PROGNOTREGISTERED:
        case RPC_FAILED:
                break;

        case RPC_CANTSEND:
        case RPC_CANTRECV:
                ret = snprintf(str, len, "; errno = %s", strerror(e.re_errno));
                if (ret < 0 || ret >= len)
                        goto truncated;
                break;

        case RPC_VERSMISMATCH:
                ret = snprintf(str, len,
                    "; low version = %u, high version = %u",
                    e.re_vers.low, e.re_vers.high);
                if (ret < 0 || ret >= len)
                        goto truncated;
                break;

        case RPC_AUTHERROR:
                ret = snprintf(str, len, "; why = ");
                if (ret < 0)
                        ret = 0;
                else if (ret >= len)
                        goto truncated;
                str += ret;
                len -= ret;
                err = auth_errmsg(e.re_why);
                if (err != NULL) {
                        ret = snprintf(str, len, "%s", err);
                        if (ret < 0 || ret >= len)
                                goto truncated;
                } else {
                        ret = snprintf(str, len,
                            "(unknown authentication error - %d)",
                            (int) e.re_why);
                        if (ret < 0 || ret >= len)
                                goto truncated;
                }
                break;

        case RPC_PROGVERSMISMATCH:
                ret = snprintf(str, len,
                    "; low version = %u, high version = %u",
                    e.re_vers.low, e.re_vers.high);
                if (ret < 0 || ret >= len)
                        goto truncated;
                break;

        default:        /* unknown */
                ret = snprintf(str, len, "; s1 = %u, s2 = %u",
                    e.re_lb.s1, e.re_lb.s2);
                if (ret < 0 || ret >= len)
                        goto truncated;
                break;
        }
        if (strlcat(buf, "\n", CLNT_PERROR_BUFLEN) >= CLNT_PERROR_BUFLEN)
                goto truncated;
        return (buf);

truncated:
        snprintf(buf + CLNT_PERROR_BUFLEN - 5, 5, "...\n");
        return (buf);
}
DEF_WEAK(clnt_sperror);

void
clnt_perror(CLIENT *rpch, char *s)
{
        (void) fprintf(stderr, "%s", clnt_sperror(rpch, s));
}
DEF_WEAK(clnt_perror);

static const char *const rpc_errlist[] = {
        "RPC: Success",                         /*  0 - RPC_SUCCESS */
        "RPC: Can't encode arguments",          /*  1 - RPC_CANTENCODEARGS */
        "RPC: Can't decode result",             /*  2 - RPC_CANTDECODERES */
        "RPC: Unable to send",                  /*  3 - RPC_CANTSEND */
        "RPC: Unable to receive",               /*  4 - RPC_CANTRECV */
        "RPC: Timed out",                       /*  5 - RPC_TIMEDOUT */
        "RPC: Incompatible versions of RPC",    /*  6 - RPC_VERSMISMATCH */
        "RPC: Authentication error",            /*  7 - RPC_AUTHERROR */
        "RPC: Program unavailable",             /*  8 - RPC_PROGUNAVAIL */
        "RPC: Program/version mismatch",        /*  9 - RPC_PROGVERSMISMATCH */
        "RPC: Procedure unavailable",           /* 10 - RPC_PROCUNAVAIL */
        "RPC: Server can't decode arguments",   /* 11 - RPC_CANTDECODEARGS */
        "RPC: Remote system error",             /* 12 - RPC_SYSTEMERROR */
        "RPC: Unknown host",                    /* 13 - RPC_UNKNOWNHOST */
        "RPC: Port mapper failure",             /* 14 - RPC_PMAPFAILURE */
        "RPC: Program not registered",          /* 15 - RPC_PROGNOTREGISTERED */
        "RPC: Failed (unspecified error)",      /* 16 - RPC_FAILED */
        "RPC: Unknown protocol"                 /* 17 - RPC_UNKNOWNPROTO */
};


/*
 * This interface for use by clntrpc
 */
char *
clnt_sperrno(enum clnt_stat stat)
{
        unsigned int errnum = stat;

        if (errnum < (sizeof(rpc_errlist)/sizeof(rpc_errlist[0])))
                return (char *)rpc_errlist[errnum];

        return ("RPC: (unknown error code)");
}
DEF_WEAK(clnt_sperrno);

void
clnt_perrno(enum clnt_stat num)
{
        (void) fprintf(stderr, "%s\n", clnt_sperrno(num));
}


char *
clnt_spcreateerror(char *s)
{
        switch (rpc_createerr.cf_stat) {
        case RPC_PMAPFAILURE:
                (void) snprintf(buf, CLNT_PERROR_BUFLEN, "%s: %s - %s\n", s,
                    clnt_sperrno(rpc_createerr.cf_stat),
                    clnt_sperrno(rpc_createerr.cf_error.re_status));
                break;

        case RPC_SYSTEMERROR:
                (void) snprintf(buf, CLNT_PERROR_BUFLEN, "%s: %s - %s\n", s,
                    clnt_sperrno(rpc_createerr.cf_stat),
                    strerror(rpc_createerr.cf_error.re_errno));
                break;

        default:
                (void) snprintf(buf, CLNT_PERROR_BUFLEN, "%s: %s\n", s,
                    clnt_sperrno(rpc_createerr.cf_stat));
                break;
        }
        buf[CLNT_PERROR_BUFLEN-2] = '\n';
        buf[CLNT_PERROR_BUFLEN-1] = '\0';
        return (buf);
}
DEF_WEAK(clnt_spcreateerror);

void
clnt_pcreateerror(char *s)
{
        fprintf(stderr, "%s", clnt_spcreateerror(s));
}
DEF_WEAK(clnt_pcreateerror);

static const char *const auth_errlist[] = {
        "Authentication OK",                    /* 0 - AUTH_OK */
        "Invalid client credential",            /* 1 - AUTH_BADCRED */
        "Server rejected credential",           /* 2 - AUTH_REJECTEDCRED */
        "Invalid client verifier",              /* 3 - AUTH_BADVERF */
        "Server rejected verifier",             /* 4 - AUTH_REJECTEDVERF */
        "Client credential too weak",           /* 5 - AUTH_TOOWEAK */
        "Invalid server verifier",              /* 6 - AUTH_INVALIDRESP */
        "Failed (unspecified error)"            /* 7 - AUTH_FAILED */
};

static char *
auth_errmsg(enum auth_stat stat)
{
        unsigned int errnum = stat;

        if (errnum < (sizeof(auth_errlist)/sizeof(auth_errlist[0])))
                return (char *)auth_errlist[errnum];

        return (NULL);
}