174 lines
4.4 KiB
C
174 lines
4.4 KiB
C
#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <libgen.h>
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#include "util.h"
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#include "net.h"
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#include "gss.h"
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#include "ops.h"
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#include "config.h"
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char *prog = NULL;
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static struct option opts[] = {
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{ NULL, 0, NULL, '\0' },
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};
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static void usage() {
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fprintf(stderr, "Usage: %s op\n", prog);
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exit(2);
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}
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static void send_gss_token(int sock, struct sockaddr *addr, socklen_t addrlen, gss_buffer_t token) {
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OM_uint32 maj_stat, min_stat;
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if (sctp_sendmsg(sock, token->value, token->length,
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addr, addrlen, MSG_AUTH, 0, 0, 0, 0) < 0)
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fatalpe("sctp_sendmsg");
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maj_stat = gss_release_buffer(&min_stat, token);
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if (maj_stat != GSS_S_COMPLETE)
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gss_fatal("gss_release_buffer", maj_stat, min_stat);
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}
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static void client_gss_auth(int sock, struct sockaddr *addr, socklen_t addrlen) {
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gss_buffer_desc incoming_tok, outgoing_tok;
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struct sctp_meta msg_meta;
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struct strbuf msg = STRBUF_INIT;
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int complete;
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complete = initial_client_token(&outgoing_tok);
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for (;;) {
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if (outgoing_tok.length)
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send_gss_token(sock, addr, addrlen, &outgoing_tok);
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else if (!complete)
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fatal("no token to send during auth");
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if (complete)
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break;
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if (!receive_one_message(sock, &msg_meta, &msg))
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fatal("connection closed during auth");
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if (msg_meta.sinfo.sinfo_ppid != MSG_AUTH)
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fatal("unexpected message type 0x%x", msg_meta.sinfo.sinfo_ppid);
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incoming_tok.value = msg.buf;
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incoming_tok.length = msg.len;
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complete = process_client_token(&incoming_tok, &outgoing_tok);
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}
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strbuf_release(&msg);
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}
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void run_remote(struct op *op, struct strbuf *in, struct strbuf *out) {
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const char *hostname = op->hostname;
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int sock = socket(PF_INET, SOCK_SEQPACKET, IPPROTO_SCTP);
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struct sockaddr_in addr;
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struct sctp_meta response_meta;
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if (!in->len)
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fatal("no data to send");
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(9987);
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addr.sin_addr = op->addr;
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struct sctp_event_subscribe events;
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memset(&events, 0, sizeof(events));
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events.sctp_data_io_event = 1;
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events.sctp_association_event = 1;
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events.sctp_address_event = 1;
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events.sctp_send_failure_event = 1;
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events.sctp_peer_error_event = 1;
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events.sctp_shutdown_event = 1;
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events.sctp_partial_delivery_event = 1;
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events.sctp_adaptation_layer_event = 1;
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if (setsockopt(sock, IPPROTO_SCTP, SCTP_EVENTS, &events, sizeof(events)))
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fatalpe("setsockopt");
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client_acquire_creds("ceod", hostname);
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client_gss_auth(sock, (sa *)&addr, sizeof(addr));
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if (sctp_sendmsg(sock, in->buf, in->len, (struct sockaddr *)&addr,
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sizeof(addr), op->id, 0, 0, 0, 0) < 0)
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fatalpe("sctp_sendmsg");
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if (!receive_one_message(sock, &response_meta, out))
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fatal("no response received for op %s", op->name);
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if (response_meta.sinfo.sinfo_ppid != op->id)
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fatal("wrong ppid from server: expected %d got %d", op->id, response_meta.sinfo.sinfo_ppid);
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if (sctp_sendmsg(sock, NULL, 0, (struct sockaddr *)&addr,
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sizeof(addr), 0, SCTP_EOF, 0, 0 ,0) < 0)
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fatalpe("sctp_sendmsg");
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}
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int client_main(char *op_name) {
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struct op *op = find_op(op_name);
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if (!op)
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fatal("no such op: %s", op_name);
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struct strbuf in = STRBUF_INIT;
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struct strbuf out = STRBUF_INIT;
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if (strbuf_read(&in, STDIN_FILENO, 0) < 0)
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fatalpe("read");
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run_remote(op, &in, &out);
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if (strbuf_write(&out, STDOUT_FILENO) < 0)
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fatalpe("write");
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strbuf_release(&in);
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strbuf_release(&out);
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return 0;
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}
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int main(int argc, char *argv[]) {
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int opt;
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int ret;
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char *op;
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prog = xstrdup(basename(argv[0]));
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init_log(prog, LOG_PID, LOG_USER, 1);
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configure();
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setup_ops();
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setup_fqdn();
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while ((opt = getopt_long(argc, argv, "", opts, NULL)) != -1) {
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switch (opt) {
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case '?':
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usage();
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break;
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default:
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fatal("error parsing arguments");
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}
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}
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if (argc - optind != 1)
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usage();
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op = argv[optind++];
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ret = client_main(op);
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free_gss();
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free_fqdn();
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free_config();
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free_ops();
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free(prog);
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return ret;
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}
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