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/* cvm/client.c - CVM client library
* Copyright (C) 2010 Bruce Guenter <bruce@untroubled.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <sys/types.h>
#include <netdb.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sysdeps.h>
#include <net/socket.h>
#include "v1client.h"
#include "protocol.h"
const char* cvm_client_account_split_chars = "@";
static struct cvm_packet request;
static struct cvm_packet response;
/* Packet management code ****************************************************/
static int parse_packet(struct cvm_packet* p)
{
if (p->data[0] != 0)
return p->data[0];
if (p->length < 3
|| p->data[p->length-1] != 0
|| p->data[p->length-2] != 0)
return CVME_BAD_MODDATA;
if (cvm_client_fact_str(CVM_FACT_USERNAME, &cvm_fact_username) ||
cvm_client_fact_uint(CVM_FACT_USERID, &cvm_fact_userid) ||
cvm_client_fact_uint(CVM_FACT_GROUPID, &cvm_fact_groupid) ||
cvm_client_fact_str(CVM_FACT_DIRECTORY, &cvm_fact_directory))
return CVME_BAD_MODDATA;
cvm_client_fact_str(CVM_FACT_SHELL, &cvm_fact_shell);
cvm_client_fact_str(CVM_FACT_REALNAME, &cvm_fact_realname);
cvm_client_fact_str(CVM_FACT_GROUPNAME, &cvm_fact_groupname);
cvm_client_fact_str(CVM_FACT_SYS_USERNAME, &cvm_fact_sys_username);
cvm_client_fact_str(CVM_FACT_SYS_DIRECTORY, &cvm_fact_sys_directory);
cvm_client_fact_str(CVM_FACT_DOMAIN, &cvm_fact_domain);
cvm_client_fact_str(CVM_FACT_MAILBOX, &cvm_fact_mailbox);
return 0;
}
static int packet_add(struct cvm_packet* p,
const char* str, unsigned len)
{
unsigned char* ptr;
if (p->length + len + 1 >= CVM_BUFSIZE-1)
return 0;
ptr = p->data + p->length;
memcpy(ptr, str, len);
ptr[len] = 0;
p->length += len + 1;
return 1;
}
static unsigned build_packet(struct cvm_packet* p,
const char* account, const char* domain,
const char** credentials, int parse_domain)
{
unsigned i;
unsigned actlen;
p->data[0] = CVM1_PROTOCOL;
p->length = 1;
actlen = strlen(account);
if (parse_domain) {
const char* sc;
if ((sc = getenv("CVM_ACCOUNT_SPLIT_CHARS")) == 0)
sc = cvm_client_account_split_chars;
i = strlen(account);
while (i-- > 0) {
if (strchr(sc, account[i]) != 0) {
domain = account + i + 1;
actlen = i;
break;
}
}
}
if (!packet_add(p, account, actlen)) return 0;
if (!packet_add(p, domain, strlen(domain))) return 0;
for (i = 0; credentials[i] != 0; i++)
if (!packet_add(p, credentials[i], strlen(credentials[i])))
return 0;
p->data[p->length++] = 0;
return 1;
}
int cvm_client_fact_str(unsigned number, const char** data)
{
static unsigned char* ptr = 0;
static unsigned last_number = -1;
if (!ptr || number != last_number)
ptr = response.data+1;
last_number = number;
while (*ptr) {
unsigned char* tmp = ptr;
ptr += strlen((char*)ptr) + 1;
if (*tmp == number) {
*data = (char*)tmp + 1;
return 0;
}
}
return CVME_NOFACT;
}
int cvm_client_fact_uint(unsigned number, unsigned long* data)
{
const char* str;
unsigned long i;
int err;
if ((err = cvm_client_fact_str(number, &str)) != 0) return err;
for (i = 0; *str >= '0' && *str <= '9'; ++str) {
unsigned long tmp = i;
i = (i * 10) + (*str - '0');
if (i < tmp)
return CVME_BAD_MODDATA;
}
if (*str)
return CVME_BAD_MODDATA;
*data = i;
return 0;
}
/* Top-level wrapper *********************************************************/
int cvm_client_authenticate(const char* module, const char* account,
const char* domain, const char** credentials,
int parse_domain)
{
int result;
void (*oldsig)(int);
if (domain == 0) domain = "";
if (!build_packet(&request, account, domain, credentials, parse_domain))
return CVME_GENERAL;
oldsig = signal(SIGPIPE, SIG_IGN);
if (!memcmp(module, "cvm-udp:", 8))
result = cvm_xfer_udp_packets(module+8, &request, &response);
else if (!memcmp(module, "cvm-local:", 10))
result = cvm_xfer_local_packets(module+10, &request, &response);
else {
if (!memcmp(module, "cvm-command:", 12)) module += 12;
result = cvm_xfer_command_packets(module, &request, &response);
}
signal(SIGPIPE, oldsig);
if (result != 0) return result;
return parse_packet(&response);
}
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