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/*
* Copyright (c) 2013 Red Hat.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*/
#include "pmapi.h"
#include "impl.h"
#include "internal.h"
#include <ctype.h>
/*
* PDU for per-user authentication (PDU_AUTH)
*/
typedef struct {
__pmPDUHdr hdr;
int attr; /* PCP_ATTR code (optional, can be zero) */
char value[sizeof(int)];
} auth_t;
int
__pmSendAuth(int fd, int from, int attr, const char *value, int length)
{
size_t need;
auth_t *pp;
int i;
int sts;
if (length < 0 || length >= LIMIT_AUTH_PDU)
return PM_ERR_IPC;
need = (sizeof(*pp) - sizeof(pp->value)) + length;
if ((pp = (auth_t *)__pmFindPDUBuf((int)need)) == NULL)
return -oserror();
pp->hdr.len = (int)need;
pp->hdr.type = PDU_AUTH;
pp->hdr.from = from;
pp->attr = htonl(attr);
memcpy(&pp->value, value, length);
#ifdef PCP_DEBUG
if (pmDebug & DBG_TRACE_CONTEXT) {
char buffer[LIMIT_AUTH_PDU];
for (i = 0; i < length; i++)
buffer[i] = isprint((int)value[i]) ? value[i] : '.';
buffer[length] = buffer[LIMIT_AUTH_PDU-1] = '\0';
if (attr)
fprintf(stderr, "__pmSendAuth [len=%d]: attr=%x value=\"%s\"\n",
length, attr, buffer);
else
fprintf(stderr, "__pmSendAuth [len=%d]: payload=\"%s\"\n",
length, buffer);
}
#endif
sts = __pmXmitPDU(fd, (__pmPDU *)pp);
__pmUnpinPDUBuf(pp);
return sts;
}
int
__pmDecodeAuth(__pmPDU *pdubuf, int *attr, char **value, int *vlen)
{
auth_t *pp;
int i;
int pdulen;
int length;
pp = (auth_t *)pdubuf;
pdulen = pp->hdr.len; /* ntohl() converted already in __pmGetPDU() */
length = pdulen - (sizeof(*pp) - sizeof(pp->value));
if (length < 0 || length >= LIMIT_AUTH_PDU)
return PM_ERR_IPC;
*attr = ntohl(pp->attr);
*value = length ? pp->value : NULL;
*vlen = length;
#ifdef PCP_DEBUG
if (pmDebug & DBG_TRACE_CONTEXT) {
char buffer[LIMIT_AUTH_PDU];
for (i = 0; i < length; i++)
buffer[i] = isprint((int)pp->value[i]) ? pp->value[i] : '.';
buffer[length] = buffer[LIMIT_AUTH_PDU-1] = '\0';
if (*attr)
fprintf(stderr, "__pmDecodeAuth [len=%d]: attr=%x value=\"%s\"\n",
length, *attr, buffer);
else
fprintf(stderr, "__pmDecodeAuth [len=%d]: payload=\"%s\"\n",
length, buffer);
}
#endif
return 0;
}
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