2 invitation.c -- Create and accept invitations
3 Copyright (C) 2013-2017 Guus Sliepen <guus@tinc-vpn.org>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 #include "control_common.h"
27 #include "invitation.h"
38 #include "ed25519/sha512.h"
40 int addressfamily = AF_UNSPEC;
42 static void scan_for_hostname(const char *filename, char **hostname, char **port) {
43 if(!filename || (*hostname && *port)) {
47 FILE *f = fopen(filename, "r");
53 while(fgets(line, sizeof(line), f)) {
59 p += strcspn(p, "\t =");
65 q = p + strspn(p, "\t ");
68 q += 1 + strspn(q + 1, "\t ");
72 p = q + strcspn(q, "\t ");
78 p += strspn(p, "\t ");
79 p[strcspn(p, "\t ")] = 0;
81 if(!*port && !strcasecmp(line, "Port")) {
83 } else if(!*hostname && !strcasecmp(line, "Address")) {
84 *hostname = xstrdup(q);
92 if(*hostname && *port) {
100 char *get_my_hostname() {
101 char *hostname = NULL;
103 char *hostport = NULL;
104 char *name = get_my_name(false);
105 char filename[PATH_MAX] = {0};
107 // Use first Address statement in own host config file
109 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", confbase, name);
110 scan_for_hostname(filename, &hostname, &port);
111 scan_for_hostname(tinc_conf, &hostname, &port);
121 // If that doesn't work, guess externally visible hostname
122 fprintf(stderr, "Trying to discover externally visible hostname...\n");
123 struct addrinfo *ai = str2addrinfo("tinc-vpn.org", "80", SOCK_STREAM);
124 struct addrinfo *aip = ai;
125 static const char request[] = "GET http://tinc-vpn.org/host.cgi HTTP/1.0\r\n\r\n";
128 int s = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
131 if(connect(s, aip->ai_addr, aip->ai_addrlen)) {
138 send(s, request, sizeof(request) - 1, 0);
139 int len = recv(s, line, sizeof(line) - 1, MSG_WAITALL);
144 if(line[len - 1] == '\n') {
148 char *p = strrchr(line, '\n');
151 hostname = xstrdup(p + 1);
170 // Check that the hostname is reasonable
172 for(char *p = hostname; *p; p++) {
173 if(isalnum(*p) || *p == '-' || *p == '.' || *p == ':') {
177 // If not, forget it.
186 fprintf(stderr, "Could not determine the external address or hostname. Please set Address manually.\n");
195 fprintf(stderr, "Please enter your host's external address or hostname");
198 fprintf(stderr, " [%s]", hostname);
201 fprintf(stderr, ": ");
203 if(!fgets(line, sizeof(line), stdin)) {
204 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
218 for(char *p = line; *p; p++) {
219 if(isalnum(*p) || *p == '-' || *p == '.') {
223 fprintf(stderr, "Invalid address or hostname.\n");
228 hostname = xstrdup(line);
233 FILE *f = fopen(filename, "a");
236 fprintf(f, "\nAddress = %s\n", hostname);
239 fprintf(stderr, "Could not append Address to %s: %s\n", filename, strerror(errno));
246 if(strchr(hostname, ':')) {
247 xasprintf(&hostport, "[%s]:%s", hostname, port);
249 xasprintf(&hostport, "%s:%s", hostname, port);
252 if(strchr(hostname, ':')) {
253 xasprintf(&hostport, "[%s]", hostname);
255 hostport = xstrdup(hostname);
264 static bool fcopy(FILE *out, const char *filename) {
265 FILE *in = fopen(filename, "r");
268 fprintf(stderr, "Could not open %s: %s\n", filename, strerror(errno));
275 while((len = fread(buf, 1, sizeof(buf), in))) {
276 fwrite(buf, len, 1, out);
283 int cmd_invite(int argc, char *argv[]) {
285 fprintf(stderr, "Not enough arguments!\n");
289 // Check validity of the new node's name
290 if(!check_id(argv[1])) {
291 fprintf(stderr, "Invalid name for node.\n");
295 myname = get_my_name(true);
301 // Ensure no host configuration file with that name exists
302 char filename[PATH_MAX];
303 snprintf(filename, sizeof(filename), "%s" SLASH "hosts" SLASH "%s", confbase, argv[1]);
305 if(!access(filename, F_OK)) {
306 fprintf(stderr, "A host config file for %s already exists!\n", argv[1]);
310 // If a daemon is running, ensure no other nodes know about this name
311 if(connect_tincd(false)) {
313 sendline(fd, "%d %d", CONTROL, REQ_DUMP_NODES);
315 while(recvline(fd, line, sizeof(line))) {
319 if(sscanf(line, "%d %d %4095s", &code, &req, node) != 3) {
323 if(!strcmp(node, argv[1])) {
329 fprintf(stderr, "A node with name %s is already known!\n", argv[1]);
334 snprintf(filename, sizeof(filename), "%s" SLASH "invitations", confbase);
336 if(mkdir(filename, 0700) && errno != EEXIST) {
337 fprintf(stderr, "Could not create directory %s: %s\n", filename, strerror(errno));
341 // Count the number of valid invitations, clean up old ones
342 DIR *dir = opendir(filename);
345 fprintf(stderr, "Could not read directory %s: %s\n", filename, strerror(errno));
352 time_t deadline = time(NULL) - 604800; // 1 week in the past
354 while((ent = readdir(dir))) {
355 if(strlen(ent->d_name) != 24) {
359 char invname[PATH_MAX];
362 if((size_t)snprintf(invname, sizeof(invname), "%s" SLASH "%s", filename, ent->d_name) >= sizeof(invname)) {
363 fprintf(stderr, "Filename too long: %s" SLASH "%s\n", filename, ent->d_name);
367 if(!stat(invname, &st)) {
368 if(deadline < st.st_mtime) {
374 fprintf(stderr, "Could not stat %s: %s\n", invname, strerror(errno));
382 fprintf(stderr, "Error while reading directory %s: %s\n", filename, strerror(errno));
387 snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "ed25519_key.priv", confbase);
389 // Remove the key if there are no outstanding invitations.
394 // Create a new key if necessary.
395 FILE *f = fopen(filename, "r");
398 if(errno != ENOENT) {
399 fprintf(stderr, "Could not read %s: %s\n", filename, strerror(errno));
403 key = ecdsa_generate();
409 f = fopen(filename, "w");
412 fprintf(stderr, "Could not write %s: %s\n", filename, strerror(errno));
417 chmod(filename, 0600);
419 if(!ecdsa_write_pem_private_key(key, f)) {
420 fprintf(stderr, "Could not write ECDSA private key\n");
428 if(connect_tincd(true)) {
429 sendline(fd, "%d %d", CONTROL, REQ_RELOAD);
431 fprintf(stderr, "Could not signal the tinc daemon. Please restart or reload it manually.\n");
434 key = ecdsa_read_pem_private_key(f);
438 fprintf(stderr, "Could not read private key from %s\n", filename);
446 // Create a hash of the key.
448 char *fingerprint = ecdsa_get_base64_public_key(key);
449 sha512(fingerprint, strlen(fingerprint), hash);
450 b64encode_urlsafe(hash, hash, 18);
454 // Create a random cookie for this invitation.
456 randomize(cookie, 18);
458 // Create a filename that doesn't reveal the cookie itself
459 char buf[18 + strlen(fingerprint)];
461 memcpy(buf, cookie, 18);
462 memcpy(buf + 18, fingerprint, sizeof(buf) - 18);
463 sha512(buf, sizeof(buf), cookiehash);
464 b64encode_urlsafe(cookiehash, cookiehash, 18);
468 b64encode_urlsafe(cookie, cookie, 18);
470 // Create a file containing the details of the invitation.
471 snprintf(filename, sizeof(filename), "%s" SLASH "invitations" SLASH "%s", confbase, cookiehash);
472 int ifd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
475 fprintf(stderr, "Could not create invitation file %s: %s\n", filename, strerror(errno));
479 f = fdopen(ifd, "w");
485 // Get the local address
486 char *address = get_my_hostname();
488 // Fill in the details.
489 fprintf(f, "Name = %s\n", argv[1]);
491 if(check_netname(netname, true)) {
492 fprintf(f, "NetName = %s\n", netname);
495 fprintf(f, "ConnectTo = %s\n", myname);
497 // Copy Broadcast and Mode
498 FILE *tc = fopen(tinc_conf, "r");
503 while(fgets(buf, sizeof(buf), tc)) {
504 if((!strncasecmp(buf, "Mode", 4) && strchr(" \t=", buf[4]))
505 || (!strncasecmp(buf, "Broadcast", 9) && strchr(" \t=", buf[9]))) {
508 // Make sure there is a newline character.
509 if(!strchr(buf, '\n')) {
518 fprintf(f, "#---------------------------------------------------------------#\n");
519 fprintf(f, "Name = %s\n", myname);
521 char filename2[PATH_MAX];
522 snprintf(filename2, sizeof(filename2), "%s" SLASH "hosts" SLASH "%s", confbase, myname);
526 // Create an URL from the local address, key hash and cookie
528 xasprintf(&url, "%s/%s%s", address, hash, cookie);
530 // Call the inviation-created script
532 environment_init(&env);
533 environment_add(&env, "NODE=%s", argv[1]);
534 environment_add(&env, "INVITATION_FILE=%s", filename);
535 environment_add(&env, "INVITATION_URL=%s", url);
536 execute_script("invitation-created", &env);
537 environment_exit(&env);
547 static char cookie[18];
548 static sptps_t sptps;
550 static size_t datalen;
551 static bool success = false;
553 static char cookie[18], hash[18];
555 static char *get_line(const char **data) {
556 if(!data || !*data) {
565 static char line[1024];
566 const char *end = strchr(*data, '\n');
567 size_t len = end ? (size_t)(end - *data) : strlen(*data);
569 if(len >= sizeof(line)) {
570 fprintf(stderr, "Maximum line length exceeded!\n");
574 if(len && !isprint(**data)) {
578 memcpy(line, *data, len);
590 static char *get_value(const char *data, const char *var) {
591 char *line = get_line(&data);
597 char *sep = line + strcspn(line, " \t=");
598 char *val = sep + strspn(sep, " \t");
601 val += 1 + strspn(val + 1, " \t");
606 if(strcasecmp(line, var)) {
613 static char *grep(const char *data, const char *var) {
614 static char value[1024];
616 const char *p = data;
617 int varlen = strlen(var);
619 // Skip all lines not starting with var
620 while(strncasecmp(p, var, varlen) || !strchr(" \t=", p[varlen])) {
635 p += strspn(p, " \t");
638 p += 1 + strspn(p + 1, " \t");
641 const char *e = strchr(p, '\n');
647 if((size_t)(e - p) >= sizeof(value)) {
648 fprintf(stderr, "Maximum line length exceeded!\n");
652 memcpy(value, p, e - p);
657 static bool finalize_join(void) {
658 const char *temp_name = get_value(data, "Name");
661 fprintf(stderr, "No Name found in invitation!\n");
665 size_t len = strlen(temp_name);
667 memcpy(name, temp_name, len);
670 if(!check_id(name)) {
671 fprintf(stderr, "Invalid Name found in invitation!\n");
676 netname = grep(data, "NetName");
678 if(netname && !check_netname(netname, true)) {
679 fprintf(stderr, "Unsafe NetName found in invitation!\n");
684 bool ask_netname = false;
685 char temp_netname[32];
699 xasprintf(&tinc_conf, "%s" SLASH "tinc.conf", confbase);
700 xasprintf(&hosts_dir, "%s" SLASH "hosts", confbase);
702 if(!access(tinc_conf, F_OK)) {
703 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
709 // Generate a random netname, ask for a better one later.
711 snprintf(temp_netname, sizeof(temp_netname), "join_%x", rand());
712 netname = temp_netname;
716 if(mkdir(confbase, 0777) && errno != EEXIST) {
717 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
721 if(mkdir(hosts_dir, 0777) && errno != EEXIST) {
722 fprintf(stderr, "Could not create directory %s: %s\n", hosts_dir, strerror(errno));
726 FILE *f = fopen(tinc_conf, "w");
729 fprintf(stderr, "Could not create file %s: %s\n", tinc_conf, strerror(errno));
733 fprintf(f, "Name = %s\n", name);
735 char filename[PATH_MAX];
736 snprintf(filename, sizeof(filename), "%s" SLASH "%s", hosts_dir, name);
737 FILE *fh = fopen(filename, "w");
740 fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
745 snprintf(filename, sizeof(filename), "%s" SLASH "invitation-data", confbase);
746 FILE *finv = fopen(filename, "w");
748 if(!finv || fwrite(data, datalen, 1, finv) != 1) {
749 fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
758 snprintf(filename, sizeof(filename), "%s" SLASH "tinc-up.invitation", confbase);
759 FILE *fup = fopen(filename, "w");
762 fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
768 ifconfig_header(fup);
770 // Filter first chunk on approved keywords, split between tinc.conf and hosts/Name
771 // Generate a tinc-up script from Ifconfig and Route keywords.
772 // Other chunks go unfiltered to their respective host config files
773 const char *p = data;
776 while((l = get_line(&p))) {
782 // Split line into variable and value
783 int len = strcspn(l, "\t =");
785 value += strspn(value, "\t ");
789 value += strspn(value, "\t ");
794 // Ignore lines with empty variable names
800 if(!strcasecmp(l, "Name")) {
801 if(strcmp(value, name)) {
806 } else if(!strcasecmp(l, "NetName")) {
810 // Check the list of known variables
814 for(i = 0; variables[i].name; i++) {
815 if(strcasecmp(l, variables[i].name)) {
823 // Handle Ifconfig and Route statements
825 if(!strcasecmp(l, "Ifconfig")) {
826 if(!strcasecmp(value, "dhcp")) {
828 } else if(!strcasecmp(value, "dhcp6")) {
830 } else if(!strcasecmp(value, "slaac")) {
833 ifconfig_address(fup, value);
837 } else if(!strcasecmp(l, "Route")) {
838 ifconfig_route(fup, value);
843 // Ignore unknown and unsafe variables
845 fprintf(stderr, "Ignoring unknown variable '%s' in invitation.\n", l);
847 } else if(!(variables[i].type & VAR_SAFE)) {
849 fprintf(stderr, "Warning: unsafe variable '%s' in invitation.\n", l);
851 fprintf(stderr, "Ignoring unsafe variable '%s' in invitation.\n", l);
856 // Copy the safe variable to the right config file
857 fprintf((variables[i].type & VAR_HOST) ? fh : f, "%s = %s\n", l, value);
861 bool valid_tinc_up = ifconfig_footer(fup);
864 while(l && !strcasecmp(l, "Name")) {
865 if(!check_id(value)) {
866 fprintf(stderr, "Invalid Name found in invitation.\n");
870 if(!strcmp(value, name)) {
871 fprintf(stderr, "Secondary chunk would overwrite our own host config file.\n");
875 snprintf(filename, sizeof(filename), "%s" SLASH "%s", hosts_dir, value);
876 f = fopen(filename, "w");
879 fprintf(stderr, "Could not create file %s: %s\n", filename, strerror(errno));
883 while((l = get_line(&p))) {
884 if(!strcmp(l, "#---------------------------------------------------------------#")) {
888 int len = strcspn(l, "\t =");
890 if(len == 4 && !strncasecmp(l, "Name", 4)) {
892 value += strspn(value, "\t ");
896 value += strspn(value, "\t ");
910 // Generate our key and send a copy to the server
911 ecdsa_t *key = ecdsa_generate();
917 char *b64key = ecdsa_get_base64_public_key(key);
923 snprintf(filename, sizeof(filename), "%s" SLASH "ed25519_key.priv", confbase);
924 f = fopenmask(filename, "w", 0600);
930 if(!ecdsa_write_pem_private_key(key, f)) {
931 fprintf(stderr, "Error writing private key!\n");
939 fprintf(fh, "Ed25519PublicKey = %s\n", b64key);
941 sptps_send_record(&sptps, 1, b64key, strlen(b64key));
945 #ifndef DISABLE_LEGACY
946 rsa_t *rsa = rsa_generate(2048, 0x1001);
947 snprintf(filename, sizeof(filename), "%s" SLASH "rsa_key.priv", confbase);
948 f = fopenmask(filename, "w", 0600);
950 if(!f || !rsa_write_pem_private_key(rsa, f)) {
951 fprintf(stderr, "Could not write private RSA key\n");
952 } else if(!rsa_write_pem_public_key(rsa, fh)) {
953 fprintf(stderr, "Could not write public RSA key\n");
967 if(ask_netname && tty) {
968 fprintf(stderr, "Enter a new netname: ");
970 if(!fgets(line, sizeof(line), stdin)) {
971 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
975 if(!*line || *line == '\n') {
979 line[strlen(line) - 1] = 0;
981 char newbase[PATH_MAX];
983 if((size_t)snprintf(newbase, sizeof(newbase), CONFDIR SLASH "tinc" SLASH "%s", line) >= sizeof(newbase)) {
984 fprintf(stderr, "Filename too long: " CONFDIR SLASH "tinc" SLASH "%s\n", line);
988 if(rename(confbase, newbase)) {
989 fprintf(stderr, "Error trying to rename %s to %s: %s\n", confbase, newbase, strerror(errno));
997 char filename2[PATH_MAX];
998 snprintf(filename, sizeof(filename), "%s" SLASH "tinc-up.invitation", confbase);
1001 snprintf(filename2, sizeof(filename2), "%s" SLASH "tinc-up.bat", confbase);
1003 snprintf(filename2, sizeof(filename2), "%s" SLASH "tinc-up", confbase);
1008 FILE *fup = fopen(filename, "r");
1011 fprintf(stderr, "\nPlease review the following tinc-up script:\n\n");
1015 while(fgets(buf, sizeof(buf), fup)) {
1024 fprintf(stderr, "\nDo you want to use this script [y]es/[n]o/[e]dit? ");
1025 response = tolower(getchar());
1026 } while(!strchr("yne", response));
1028 fprintf(stderr, "\n");
1030 if(response == 'e') {
1033 const char *editor = getenv("VISUAL");
1036 editor = getenv("EDITOR");
1043 xasprintf(&command, "\"%s\" \"%s\"", editor, filename);
1045 xasprintf(&command, "edit \"%s\"", filename);
1048 if(system(command)) {
1057 if(response == 'y') {
1058 rename(filename, filename2);
1059 chmod(filename2, 0755);
1060 fprintf(stderr, "tinc-up enabled.\n");
1062 fprintf(stderr, "tinc-up has been left disabled.\n");
1067 rename(filename, filename2);
1068 chmod(filename2, 0755);
1069 fprintf(stderr, "tinc-up enabled.\n");
1071 fprintf(stderr, "A tinc-up script was generated, but has been left disabled.\n");
1075 // A placeholder was generated.
1076 rename(filename, filename2);
1077 chmod(filename2, 0755);
1080 fprintf(stderr, "Configuration stored in: %s\n", confbase);
1086 static bool invitation_send(void *handle, uint8_t type, const void *vdata, size_t len) {
1089 const char *data = vdata;
1092 int result = send(sock, data, len, 0);
1094 if(result == -1 && sockwouldblock(sockerrno)) {
1096 } else if(result <= 0) {
1107 static bool invitation_receive(void *handle, uint8_t type, const void *msg, uint16_t len) {
1111 case SPTPS_HANDSHAKE:
1112 return sptps_send_record(&sptps, 0, cookie, sizeof(cookie));
1115 data = xrealloc(data, datalen + len + 1);
1116 memcpy(data + datalen, msg, len);
1122 return finalize_join();
1125 fprintf(stderr, "Invitation successfully accepted.\n");
1126 shutdown(sock, SHUT_RDWR);
1137 int cmd_join(int argc, char *argv[]) {
1143 fprintf(stderr, "Too many arguments!\n");
1147 // Make sure confbase exists and is accessible.
1148 if(!confbase_given && mkdir(confdir, 0755) && errno != EEXIST) {
1149 fprintf(stderr, "Could not create directory %s: %s\n", confdir, strerror(errno));
1153 if(mkdir(confbase, 0777) && errno != EEXIST) {
1154 fprintf(stderr, "Could not create directory %s: %s\n", confbase, strerror(errno));
1158 if(access(confbase, R_OK | W_OK | X_OK)) {
1159 fprintf(stderr, "No permission to write in directory %s: %s\n", confbase, strerror(errno));
1163 // If a netname or explicit configuration directory is specified, check for an existing tinc.conf.
1164 if((netname || confbasegiven) && !access(tinc_conf, F_OK)) {
1165 fprintf(stderr, "Configuration file %s already exists!\n", tinc_conf);
1169 // Either read the invitation from the command line or from stdin.
1173 invitation = argv[1];
1176 fprintf(stderr, "Enter invitation URL: ");
1181 if(!fgets(line, sizeof(line), stdin)) {
1182 fprintf(stderr, "Error while reading stdin: %s\n", strerror(errno));
1189 // Parse the invitation URL.
1192 char *slash = strchr(invitation, '/');
1200 if(strlen(slash) != 48) {
1204 char *address = invitation;
1207 if(*address == '[') {
1209 char *bracket = strchr(address, ']');
1217 if(bracket[1] == ':') {
1221 port = strchr(address, ':');
1228 if(!port || !*port) {
1232 if(!b64decode(slash, hash, 24) || !b64decode(slash + 24, cookie, 24)) {
1236 // Generate a throw-away key for the invitation.
1237 ecdsa_t *key = ecdsa_generate();
1243 char *b64key = ecdsa_get_base64_public_key(key);
1245 // Connect to the tinc daemon mentioned in the URL.
1246 struct addrinfo *ai = str2addrinfo(address, port, SOCK_STREAM);
1253 struct addrinfo *aip = NULL;
1268 sock = socket(aip->ai_family, aip->ai_socktype, aip->ai_protocol);
1271 fprintf(stderr, "Could not open socket: %s\n", strerror(errno));
1275 if(connect(sock, aip->ai_addr, aip->ai_addrlen)) {
1276 char *addrstr, *portstr;
1277 sockaddr2str((sockaddr_t *)aip->ai_addr, &addrstr, &portstr);
1278 fprintf(stderr, "Could not connect to %s port %s: %s\n", addrstr, portstr, strerror(errno));
1285 fprintf(stderr, "Connected to %s port %s...\n", address, port);
1287 // Tell him we have an invitation, and give him our throw-away key.
1288 int len = snprintf(line, sizeof(line), "0 ?%s %d.%d\n", b64key, PROT_MAJOR, PROT_MINOR);
1290 if(len <= 0 || (size_t)len >= sizeof(line)) {
1294 if(!sendline(sock, "0 ?%s %d.%d", b64key, PROT_MAJOR, 1)) {
1295 fprintf(stderr, "Error sending request to %s port %s: %s\n", address, port, strerror(errno));
1300 char hisname[4096] = "";
1301 int code, hismajor, hisminor = 0;
1303 if(!recvline(sock, line, sizeof(line)) || sscanf(line, "%d %4095s %d.%d", &code, hisname, &hismajor, &hisminor) < 3 || code != 0 || hismajor != PROT_MAJOR || !check_id(hisname) || !recvline(sock, line, sizeof(line)) || !rstrip(line) || sscanf(line, "%d ", &code) != 1 || code != ACK || strlen(line) < 3) {
1304 fprintf(stderr, "Cannot read greeting from peer\n");
1316 // Check if the hash of the key he gave us matches the hash in the URL.
1317 char *fingerprint = line + 2;
1320 if(sha512(fingerprint, strlen(fingerprint), hishash)) {
1321 fprintf(stderr, "Could not create digest\n%s\n", line + 2);
1325 if(memcmp(hishash, hash, 18)) {
1326 fprintf(stderr, "Peer has an invalid key!\n%s\n", line + 2);
1331 ecdsa_t *hiskey = ecdsa_set_base64_public_key(fingerprint);
1337 // Start an SPTPS session
1338 if(!sptps_start(&sptps, NULL, true, false, key, hiskey, "tinc invitation", 15, invitation_send, invitation_receive)) {
1342 // Feed rest of input buffer to SPTPS
1343 if(!sptps_receive_data(&sptps, buffer, blen)) {
1347 while((len = recv(sock, line, sizeof(line), 0))) {
1349 if(sockwouldblock(sockerrno)) {
1355 // If socket has been shut down, recv() on Windows returns -1 and sets sockerrno
1356 // to WSAESHUTDOWN, while on UNIX-like operating systems recv() returns 0, so we
1357 // have to do an explicit check here.
1358 if(sockshutdown(sockerrno)) {
1363 fprintf(stderr, "Error reading data from %s port %s: %s\n", address, port, sockstrerror(sockerrno));
1370 int done = sptps_receive_data(&sptps, p, len);
1387 fprintf(stderr, "Connection closed by peer, invitation cancelled.\n");
1394 fprintf(stderr, "Invalid invitation URL.\n");