Python CSC Electronic Office
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pyceo/src/dslave.c

160 lines
4.1 KiB

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <syslog.h>
#include <libgen.h>
#include <getopt.h>
#include <errno.h>
#include <netdb.h>
#include <alloca.h>
#include "util.h"
#include "strbuf.h"
#include "net.h"
#include "config.h"
#include "gss.h"
#include "daemon.h"
#include "ldap.h"
#include "kadm.h"
#include "krb5.h"
#include "ops.h"
static void signal_handler(int sig) {
if (sig == SIGSEGV) {
error("segmentation fault");
signal(sig, SIG_DFL);
raise(sig);
} else if (sig != SIGCHLD) {
fatal("unhandled signal %d", sig);
}
}
static void setup_slave_sigs(void) {
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_handler = signal_handler;
sigaction(SIGCHLD, &sa, NULL);
sigaction(SIGSEGV, &sa, NULL);
signal(SIGINT, SIG_DFL);
signal(SIGTERM, SIG_DFL);
signal(SIGPIPE, SIG_IGN);
if (terminate)
raise(fatal_signal);
}
static void setup_client(int client, struct sockaddr *addr) {
struct sctp_event_subscribe events;
memset(&events, 0, sizeof(events));
events.sctp_data_io_event = 1;
events.sctp_address_event = 1;
events.sctp_send_failure_event = 1;
events.sctp_peer_error_event = 1;
events.sctp_partial_delivery_event = 1;
events.sctp_adaptation_layer_event = 1;
if (setsockopt(client, IPPROTO_SCTP, SCTP_EVENTS, &events, sizeof(events)))
fatalpe("setsockopt(SCTP_EVENTS)");
}
static void handle_auth_message(struct strbuf *in, struct strbuf *out) {
gss_buffer_desc incoming_tok, outgoing_tok;
OM_uint32 maj_stat, min_stat;
incoming_tok.value = in->buf;
incoming_tok.length = in->len;
process_server_token(&incoming_tok, &outgoing_tok);
strbuf_add(out, outgoing_tok.value, outgoing_tok.length);
if (outgoing_tok.length) {
maj_stat = gss_release_buffer(&min_stat, &outgoing_tok);
if (maj_stat != GSS_S_COMPLETE)
gss_fatal("gss_release_buffer", maj_stat, min_stat);
}
}
static void handle_op_message(uint32_t in_type, struct strbuf *in, struct strbuf *out) {
struct op *op = get_local_op(in_type);
char *envp[16];
debug("running op: %s", op->name);
if (!op->name)
fatal("operation %x does not exist", in_type);
/* TEMPORARY */
if (!client_username())
fatal("unathenticated");
make_env(envp, "LANG", "C", "CEO_USER", client_username(),
"CEO_CONFIG_DIR", config_dir, NULL);
char *argv[] = { op->path, NULL, };
if (spawnvemu(op->path, argv, envp, in, out, 0, op->user))
fatal("child %s failed", op->path);
if (!out->len)
fatal("no response from op");
free_env(envp);
}
static void handle_one_message(int sock, struct sctp_meta *in_meta, struct strbuf *in) {
struct strbuf out = STRBUF_INIT;
uint32_t ppid = in_meta->sinfo.sinfo_ppid;
if (ppid == MSG_AUTH)
handle_auth_message(in, &out);
else
handle_op_message(ppid, in, &out);
if (out.len && sctp_sendmsg(sock, out.buf, out.len,
(sa *)&in_meta->from, in_meta->fromlen, ppid,
0, 0, 0, 0) < 0)
fatalpe("sctp_sendmsg");
strbuf_release(&out);
}
void slave_main(int sock, struct sockaddr *addr) {
char addrstr[INET_ADDRSTRLEN];
struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
struct sctp_meta msg_meta;
struct strbuf msg = STRBUF_INIT;
if (addr->sa_family != AF_INET)
fatal("unsupported address family %d", addr->sa_family);
if (!inet_ntop(AF_INET, &addr_in->sin_addr, addrstr, sizeof(addrstr)))
fatalpe("inet_ntop");
notice("accepted connection from %s", addrstr);
setup_slave_sigs();
setup_client(sock, addr);
while (!terminate) {
if (!receive_one_message(sock, &msg_meta, &msg))
break;
handle_one_message(sock, &msg_meta, &msg);
}
notice("connection closed by peer %s", addrstr);
strbuf_release(&msg);
/* stuff allocated by dmaster */
free_gss();
free_config();
free_fqdn();
free_ops();
free(prog);
}