96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
#include <stdio.h>
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#include <sys/utsname.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <errno.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 "strbuf.h"
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struct strbuf fqdn = STRBUF_INIT;
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const size_t MAX_MSGLEN = 65536;
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const size_t MSG_BUFINC = 4096;
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void setup_fqdn(void) {
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struct utsname uts;
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struct hostent *lo;
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if (uname(&uts))
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fatalpe("uname");
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lo = gethostbyname(uts.nodename);
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if (!lo)
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fatalpe("gethostbyname");
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strbuf_addstr(&fqdn, lo->h_name);
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}
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void free_fqdn(void) {
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strbuf_release(&fqdn);
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}
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int ceo_send_message(int sock, void *buf, size_t len, uint32_t msgtype) {
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uint32_t msgheader[2];
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msgheader[0] = htonl(len);
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msgheader[1] = htonl(msgtype);
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if (full_write(sock, msgheader, sizeof(msgheader)) < 0)
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fatalpe("write");
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if (full_write(sock, buf, len) < 0)
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fatalpe("write");
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return 0;
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}
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int ceo_receive_message(int sock, struct strbuf *msg, uint32_t *msgtype) {
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uint32_t msglen, received = 0;
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uint32_t msgheader[2];
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ssize_t bytes;
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strbuf_reset(msg);
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while (received < sizeof(msgheader)) {
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bytes = read(sock, msgheader, sizeof(msgheader) - received);
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if (bytes < 0) {
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if (errno == EAGAIN)
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continue;
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fatalpe("read");
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}
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if (!bytes && !received)
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return -1;
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if (!bytes)
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fatalpe("short header received");
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received += bytes;
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}
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msglen = ntohl(msgheader[0]);
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*msgtype = ntohl(msgheader[1]);
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received = 0;
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if (!msglen)
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fatal("length is zero in message header");
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if (msglen > MAX_MSGLEN)
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fatal("length is huge in message header");
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strbuf_grow(msg, msglen);
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strbuf_setlen(msg, msglen);
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while (received < msglen) {
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bytes = read(sock, msg->buf + received, msglen - received);
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if (bytes < 0) {
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if (errno == EAGAIN)
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continue;
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fatalpe("read");
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}
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if (!bytes)
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fatal("short message received");
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received += bytes;
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}
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return 0;
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}
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