1 d65a88a2 2021-09-05 stsp /*
  2 d65a88a2 2021-09-05 stsp  * Copyright (c) 2018, 2019 Ori Bernstein <ori@openbsd.org>
  3 d65a88a2 2021-09-05 stsp  * Copyright (c) 2021 Stefan Sperling <stsp@openbsd.org>
  4 d65a88a2 2021-09-05 stsp  *
  5 d65a88a2 2021-09-05 stsp  * Permission to use, copy, modify, and distribute this software for any
  6 d65a88a2 2021-09-05 stsp  * purpose with or without fee is hereby granted, provided that the above
  7 d65a88a2 2021-09-05 stsp  * copyright notice and this permission notice appear in all copies.
  8 d65a88a2 2021-09-05 stsp  *
  9 d65a88a2 2021-09-05 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 10 d65a88a2 2021-09-05 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 11 d65a88a2 2021-09-05 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 12 d65a88a2 2021-09-05 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 13 d65a88a2 2021-09-05 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 14 d65a88a2 2021-09-05 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 15 d65a88a2 2021-09-05 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 16 d65a88a2 2021-09-05 stsp  */
 17 d65a88a2 2021-09-05 stsp 
 18 8b925c6c 2022-07-16 thomas #include <sys/queue.h>
 19 d65a88a2 2021-09-05 stsp #include <sys/types.h>
 20 d65a88a2 2021-09-05 stsp #include <sys/socket.h>
 21 d65a88a2 2021-09-05 stsp #include <netdb.h>
 22 d65a88a2 2021-09-05 stsp 
 23 c10270f6 2021-09-06 naddy #include <assert.h>
 24 d65a88a2 2021-09-05 stsp #include <err.h>
 25 d65a88a2 2021-09-05 stsp #include <stdio.h>
 26 d65a88a2 2021-09-05 stsp #include <stdlib.h>
 27 d65a88a2 2021-09-05 stsp #include <string.h>
 28 d65a88a2 2021-09-05 stsp #include <unistd.h>
 29 d65a88a2 2021-09-05 stsp 
 30 d65a88a2 2021-09-05 stsp #include "got_error.h"
 31 5e5da8c4 2021-09-05 stsp #include "got_path.h"
 32 d65a88a2 2021-09-05 stsp 
 33 dd038bc6 2021-09-21 thomas.ad #include "got_compat.h"
 34 dd038bc6 2021-09-21 thomas.ad 
 35 d65a88a2 2021-09-05 stsp #include "got_lib_dial.h"
 36 ef20f542 2022-06-26 thomas #include "got_dial.h"
 37 c10270f6 2021-09-06 naddy 
 38 c10270f6 2021-09-06 naddy #ifndef nitems
 39 c10270f6 2021-09-06 naddy #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
 40 c10270f6 2021-09-06 naddy #endif
 41 d65a88a2 2021-09-05 stsp 
 42 d65a88a2 2021-09-05 stsp #ifndef ssizeof
 43 d65a88a2 2021-09-05 stsp #define ssizeof(_x) ((ssize_t)(sizeof(_x)))
 44 d65a88a2 2021-09-05 stsp #endif
 45 d65a88a2 2021-09-05 stsp 
 46 d65a88a2 2021-09-05 stsp #ifndef MIN
 47 d65a88a2 2021-09-05 stsp #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
 48 d65a88a2 2021-09-05 stsp #endif
 49 d65a88a2 2021-09-05 stsp 
 50 d65a88a2 2021-09-05 stsp #ifndef GOT_DIAL_PATH_SSH
 51 d65a88a2 2021-09-05 stsp #define GOT_DIAL_PATH_SSH	"/usr/bin/ssh"
 52 d65a88a2 2021-09-05 stsp #endif
 53 d65a88a2 2021-09-05 stsp 
 54 d65a88a2 2021-09-05 stsp /* IANA assigned */
 55 d65a88a2 2021-09-05 stsp #define GOT_DEFAULT_GIT_PORT		9418
 56 d65a88a2 2021-09-05 stsp #define GOT_DEFAULT_GIT_PORT_STR	"9418"
 57 d65a88a2 2021-09-05 stsp 
 58 d65a88a2 2021-09-05 stsp const struct got_error *
 59 d65a88a2 2021-09-05 stsp got_dial_apply_unveil(const char *proto)
 60 d65a88a2 2021-09-05 stsp {
 61 d65a88a2 2021-09-05 stsp 	if (strcmp(proto, "git+ssh") == 0 || strcmp(proto, "ssh") == 0) {
 62 d65a88a2 2021-09-05 stsp 		if (unveil(GOT_DIAL_PATH_SSH, "x") != 0) {
 63 d65a88a2 2021-09-05 stsp 			return got_error_from_errno2("unveil",
 64 d65a88a2 2021-09-05 stsp 			    GOT_DIAL_PATH_SSH);
 65 d65a88a2 2021-09-05 stsp 		}
 66 d65a88a2 2021-09-05 stsp 	}
 67 d65a88a2 2021-09-05 stsp 
 68 d65a88a2 2021-09-05 stsp 	return NULL;
 69 d65a88a2 2021-09-05 stsp }
 70 d65a88a2 2021-09-05 stsp 
 71 5e5da8c4 2021-09-05 stsp static int
 72 0c6f49ba 2022-07-01 thomas hassuffix(const char *base, const char *suf)
 73 5e5da8c4 2021-09-05 stsp {
 74 5e5da8c4 2021-09-05 stsp 	int nb, ns;
 75 5e5da8c4 2021-09-05 stsp 
 76 5e5da8c4 2021-09-05 stsp 	nb = strlen(base);
 77 5e5da8c4 2021-09-05 stsp 	ns = strlen(suf);
 78 5e5da8c4 2021-09-05 stsp 	if (ns <= nb && strcmp(base + (nb - ns), suf) == 0)
 79 5e5da8c4 2021-09-05 stsp 		return 1;
 80 5e5da8c4 2021-09-05 stsp 	return 0;
 81 5e5da8c4 2021-09-05 stsp }
 82 5e5da8c4 2021-09-05 stsp 
 83 d65a88a2 2021-09-05 stsp const struct got_error *
 84 5e5da8c4 2021-09-05 stsp got_dial_parse_uri(char **proto, char **host, char **port,
 85 5e5da8c4 2021-09-05 stsp     char **server_path, char **repo_name, const char *uri)
 86 5e5da8c4 2021-09-05 stsp {
 87 5e5da8c4 2021-09-05 stsp 	const struct got_error *err = NULL;
 88 5e5da8c4 2021-09-05 stsp 	char *s, *p, *q;
 89 5e5da8c4 2021-09-05 stsp 
 90 5e5da8c4 2021-09-05 stsp 	*proto = *host = *port = *server_path = *repo_name = NULL;
 91 5e5da8c4 2021-09-05 stsp 
 92 5e5da8c4 2021-09-05 stsp 	p = strstr(uri, "://");
 93 5e5da8c4 2021-09-05 stsp 	if (!p) {
 94 5e5da8c4 2021-09-05 stsp 		/* Try parsing Git's "scp" style URL syntax. */
 95 5e5da8c4 2021-09-05 stsp 		*proto = strdup("ssh");
 96 2996af60 2022-03-07 thomas 		if (*proto == NULL) {
 97 5e5da8c4 2021-09-05 stsp 			err = got_error_from_errno("strdup");
 98 5e5da8c4 2021-09-05 stsp 			goto done;
 99 5e5da8c4 2021-09-05 stsp 		}
100 5e5da8c4 2021-09-05 stsp 		s = (char *)uri;
101 5e5da8c4 2021-09-05 stsp 		q = strchr(s, ':');
102 5e5da8c4 2021-09-05 stsp 		if (q == NULL) {
103 5e5da8c4 2021-09-05 stsp 			err = got_error(GOT_ERR_PARSE_URI);
104 5e5da8c4 2021-09-05 stsp 			goto done;
105 5e5da8c4 2021-09-05 stsp 		}
106 5e5da8c4 2021-09-05 stsp 		/* No slashes allowed before first colon. */
107 5e5da8c4 2021-09-05 stsp 		p = strchr(s, '/');
108 5e5da8c4 2021-09-05 stsp 		if (p && q > p) {
109 5e5da8c4 2021-09-05 stsp 			err = got_error(GOT_ERR_PARSE_URI);
110 5e5da8c4 2021-09-05 stsp 			goto done;
111 5e5da8c4 2021-09-05 stsp 		}
112 5e5da8c4 2021-09-05 stsp 		*host = strndup(s, q - s);
113 5e5da8c4 2021-09-05 stsp 		if (*host == NULL) {
114 5e5da8c4 2021-09-05 stsp 			err = got_error_from_errno("strndup");
115 5e5da8c4 2021-09-05 stsp 			goto done;
116 5e5da8c4 2021-09-05 stsp 		}
117 26ec43f5 2022-03-07 thomas 		if ((*host)[0] == '\0') {
118 26ec43f5 2022-03-07 thomas 			err = got_error(GOT_ERR_PARSE_URI);
119 26ec43f5 2022-03-07 thomas 			goto done;
120 26ec43f5 2022-03-07 thomas 		}
121 5e5da8c4 2021-09-05 stsp 		p = q + 1;
122 5e5da8c4 2021-09-05 stsp 	} else {
123 5e5da8c4 2021-09-05 stsp 		*proto = strndup(uri, p - uri);
124 2996af60 2022-03-07 thomas 		if (*proto == NULL) {
125 5e5da8c4 2021-09-05 stsp 			err = got_error_from_errno("strndup");
126 5e5da8c4 2021-09-05 stsp 			goto done;
127 5e5da8c4 2021-09-05 stsp 		}
128 5e5da8c4 2021-09-05 stsp 		s = p + 3;
129 5e5da8c4 2021-09-05 stsp 
130 5e5da8c4 2021-09-05 stsp 		p = strstr(s, "/");
131 5e5da8c4 2021-09-05 stsp 		if (p == NULL || strlen(p) == 1) {
132 5e5da8c4 2021-09-05 stsp 			err = got_error(GOT_ERR_PARSE_URI);
133 5e5da8c4 2021-09-05 stsp 			goto done;
134 5e5da8c4 2021-09-05 stsp 		}
135 5e5da8c4 2021-09-05 stsp 
136 5e5da8c4 2021-09-05 stsp 		q = memchr(s, ':', p - s);
137 5e5da8c4 2021-09-05 stsp 		if (q) {
138 5e5da8c4 2021-09-05 stsp 			*host = strndup(s, q - s);
139 5e5da8c4 2021-09-05 stsp 			if (*host == NULL) {
140 5e5da8c4 2021-09-05 stsp 				err = got_error_from_errno("strndup");
141 5e5da8c4 2021-09-05 stsp 				goto done;
142 5e5da8c4 2021-09-05 stsp 			}
143 26ec43f5 2022-03-07 thomas 			if ((*host)[0] == '\0') {
144 26ec43f5 2022-03-07 thomas 				err = got_error(GOT_ERR_PARSE_URI);
145 26ec43f5 2022-03-07 thomas 				goto done;
146 26ec43f5 2022-03-07 thomas 			}
147 5e5da8c4 2021-09-05 stsp 			*port = strndup(q + 1, p - (q + 1));
148 5e5da8c4 2021-09-05 stsp 			if (*port == NULL) {
149 5e5da8c4 2021-09-05 stsp 				err = got_error_from_errno("strndup");
150 5e5da8c4 2021-09-05 stsp 				goto done;
151 5e5da8c4 2021-09-05 stsp 			}
152 26ec43f5 2022-03-07 thomas 			if ((*port)[0] == '\0') {
153 26ec43f5 2022-03-07 thomas 				err = got_error(GOT_ERR_PARSE_URI);
154 26ec43f5 2022-03-07 thomas 				goto done;
155 26ec43f5 2022-03-07 thomas 			}
156 5e5da8c4 2021-09-05 stsp 		} else {
157 5e5da8c4 2021-09-05 stsp 			*host = strndup(s, p - s);
158 5e5da8c4 2021-09-05 stsp 			if (*host == NULL) {
159 5e5da8c4 2021-09-05 stsp 				err = got_error_from_errno("strndup");
160 5e5da8c4 2021-09-05 stsp 				goto done;
161 5e5da8c4 2021-09-05 stsp 			}
162 26ec43f5 2022-03-07 thomas 			if ((*host)[0] == '\0') {
163 26ec43f5 2022-03-07 thomas 				err = got_error(GOT_ERR_PARSE_URI);
164 26ec43f5 2022-03-07 thomas 				goto done;
165 26ec43f5 2022-03-07 thomas 			}
166 5e5da8c4 2021-09-05 stsp 		}
167 5e5da8c4 2021-09-05 stsp 	}
168 5e5da8c4 2021-09-05 stsp 
169 5e5da8c4 2021-09-05 stsp 	while (p[0] == '/' && p[1] == '/')
170 5e5da8c4 2021-09-05 stsp 		p++;
171 5e5da8c4 2021-09-05 stsp 	*server_path = strdup(p);
172 5e5da8c4 2021-09-05 stsp 	if (*server_path == NULL) {
173 5e5da8c4 2021-09-05 stsp 		err = got_error_from_errno("strdup");
174 5e5da8c4 2021-09-05 stsp 		goto done;
175 5e5da8c4 2021-09-05 stsp 	}
176 5e5da8c4 2021-09-05 stsp 	got_path_strip_trailing_slashes(*server_path);
177 26ec43f5 2022-03-07 thomas 	if ((*server_path)[0] == '\0') {
178 5e5da8c4 2021-09-05 stsp 		err = got_error(GOT_ERR_PARSE_URI);
179 5e5da8c4 2021-09-05 stsp 		goto done;
180 5e5da8c4 2021-09-05 stsp 	}
181 26ec43f5 2022-03-07 thomas 
182 26ec43f5 2022-03-07 thomas 	err = got_path_basename(repo_name, *server_path);
183 26ec43f5 2022-03-07 thomas 	if (err)
184 5e5da8c4 2021-09-05 stsp 		goto done;
185 26ec43f5 2022-03-07 thomas 	if (hassuffix(*repo_name, ".git"))
186 26ec43f5 2022-03-07 thomas 		(*repo_name)[strlen(*repo_name) - 4] = '\0';
187 26ec43f5 2022-03-07 thomas 	if ((*repo_name)[0] == '\0')
188 26ec43f5 2022-03-07 thomas 		err = got_error(GOT_ERR_PARSE_URI);
189 5e5da8c4 2021-09-05 stsp done:
190 5e5da8c4 2021-09-05 stsp 	if (err) {
191 5e5da8c4 2021-09-05 stsp 		free(*proto);
192 5e5da8c4 2021-09-05 stsp 		*proto = NULL;
193 5e5da8c4 2021-09-05 stsp 		free(*host);
194 5e5da8c4 2021-09-05 stsp 		*host = NULL;
195 5e5da8c4 2021-09-05 stsp 		free(*port);
196 5e5da8c4 2021-09-05 stsp 		*port = NULL;
197 5e5da8c4 2021-09-05 stsp 		free(*server_path);
198 5e5da8c4 2021-09-05 stsp 		*server_path = NULL;
199 5e5da8c4 2021-09-05 stsp 		free(*repo_name);
200 5e5da8c4 2021-09-05 stsp 		*repo_name = NULL;
201 5e5da8c4 2021-09-05 stsp 	}
202 5e5da8c4 2021-09-05 stsp 	return err;
203 5e5da8c4 2021-09-05 stsp }
204 5e5da8c4 2021-09-05 stsp 
205 5e5da8c4 2021-09-05 stsp const struct got_error *
206 d65a88a2 2021-09-05 stsp got_dial_ssh(pid_t *newpid, int *newfd, const char *host,
207 d65a88a2 2021-09-05 stsp     const char *port, const char *path, const char *direction, int verbosity)
208 d65a88a2 2021-09-05 stsp {
209 d65a88a2 2021-09-05 stsp 	const struct got_error *error = NULL;
210 d65a88a2 2021-09-05 stsp 	int pid, pfd[2];
211 d65a88a2 2021-09-05 stsp 	char cmd[64];
212 0c6f49ba 2022-07-01 thomas 	const char *argv[11];
213 d65a88a2 2021-09-05 stsp 	int i = 0, j;
214 d65a88a2 2021-09-05 stsp 
215 d65a88a2 2021-09-05 stsp 	*newpid = -1;
216 d65a88a2 2021-09-05 stsp 	*newfd = -1;
217 d65a88a2 2021-09-05 stsp 
218 d65a88a2 2021-09-05 stsp 	argv[i++] = GOT_DIAL_PATH_SSH;
219 d65a88a2 2021-09-05 stsp 	if (port != NULL) {
220 d65a88a2 2021-09-05 stsp 		argv[i++] = "-p";
221 d65a88a2 2021-09-05 stsp 		argv[i++] = (char *)port;
222 d65a88a2 2021-09-05 stsp 	}
223 d65a88a2 2021-09-05 stsp 	if (verbosity == -1) {
224 d65a88a2 2021-09-05 stsp 		argv[i++] = "-q";
225 d65a88a2 2021-09-05 stsp 	} else {
226 d65a88a2 2021-09-05 stsp 		/* ssh(1) allows up to 3 "-v" options. */
227 d65a88a2 2021-09-05 stsp 		for (j = 0; j < MIN(3, verbosity); j++)
228 d65a88a2 2021-09-05 stsp 			argv[i++] = "-v";
229 d65a88a2 2021-09-05 stsp 	}
230 d65a88a2 2021-09-05 stsp 	argv[i++] = "--";
231 d65a88a2 2021-09-05 stsp 	argv[i++] = (char *)host;
232 d65a88a2 2021-09-05 stsp 	argv[i++] = (char *)cmd;
233 d65a88a2 2021-09-05 stsp 	argv[i++] = (char *)path;
234 d65a88a2 2021-09-05 stsp 	argv[i++] = NULL;
235 c10270f6 2021-09-06 naddy 	assert(i <= nitems(argv));
236 d65a88a2 2021-09-05 stsp 
237 d65a88a2 2021-09-05 stsp 	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pfd) == -1)
238 d65a88a2 2021-09-05 stsp 		return got_error_from_errno("socketpair");
239 d65a88a2 2021-09-05 stsp 
240 d65a88a2 2021-09-05 stsp 	pid = fork();
241 d65a88a2 2021-09-05 stsp 	if (pid == -1) {
242 d65a88a2 2021-09-05 stsp 		error = got_error_from_errno("fork");
243 d65a88a2 2021-09-05 stsp 		close(pfd[0]);
244 d65a88a2 2021-09-05 stsp 		close(pfd[1]);
245 d65a88a2 2021-09-05 stsp 		return error;
246 d65a88a2 2021-09-05 stsp 	} else if (pid == 0) {
247 d65a88a2 2021-09-05 stsp 		int n;
248 d65a88a2 2021-09-05 stsp 		if (close(pfd[1]) == -1)
249 d65a88a2 2021-09-05 stsp 			err(1, "close");
250 d65a88a2 2021-09-05 stsp 		if (dup2(pfd[0], 0) == -1)
251 d65a88a2 2021-09-05 stsp 			err(1, "dup2");
252 d65a88a2 2021-09-05 stsp 		if (dup2(pfd[0], 1) == -1)
253 d65a88a2 2021-09-05 stsp 			err(1, "dup2");
254 d65a88a2 2021-09-05 stsp 		n = snprintf(cmd, sizeof(cmd), "git-%s-pack", direction);
255 d65a88a2 2021-09-05 stsp 		if (n < 0 || n >= ssizeof(cmd))
256 d65a88a2 2021-09-05 stsp 			err(1, "snprintf");
257 0c6f49ba 2022-07-01 thomas 		if (execv(GOT_DIAL_PATH_SSH, (char *const *)argv) == -1)
258 d65a88a2 2021-09-05 stsp 			err(1, "execv");
259 d65a88a2 2021-09-05 stsp 		abort(); /* not reached */
260 d65a88a2 2021-09-05 stsp 	} else {
261 d65a88a2 2021-09-05 stsp 		if (close(pfd[0]) == -1)
262 d65a88a2 2021-09-05 stsp 			return got_error_from_errno("close");
263 d65a88a2 2021-09-05 stsp 		*newpid = pid;
264 d65a88a2 2021-09-05 stsp 		*newfd = pfd[1];
265 d65a88a2 2021-09-05 stsp 		return NULL;
266 d65a88a2 2021-09-05 stsp 	}
267 d65a88a2 2021-09-05 stsp }
268 d65a88a2 2021-09-05 stsp 
269 d65a88a2 2021-09-05 stsp const struct got_error *
270 d65a88a2 2021-09-05 stsp got_dial_git(int *newfd, const char *host, const char *port,
271 d65a88a2 2021-09-05 stsp     const char *path, const char *direction)
272 d65a88a2 2021-09-05 stsp {
273 d65a88a2 2021-09-05 stsp 	const struct got_error *err = NULL;
274 d65a88a2 2021-09-05 stsp 	struct addrinfo hints, *servinfo, *p;
275 d65a88a2 2021-09-05 stsp 	char *cmd = NULL;
276 d65a88a2 2021-09-05 stsp 	int fd = -1, len, r, eaicode;
277 d65a88a2 2021-09-05 stsp 
278 d65a88a2 2021-09-05 stsp 	*newfd = -1;
279 d65a88a2 2021-09-05 stsp 
280 d65a88a2 2021-09-05 stsp 	if (port == NULL)
281 d65a88a2 2021-09-05 stsp 		port = GOT_DEFAULT_GIT_PORT_STR;
282 d65a88a2 2021-09-05 stsp 
283 d65a88a2 2021-09-05 stsp 	memset(&hints, 0, sizeof hints);
284 d65a88a2 2021-09-05 stsp 	hints.ai_family = AF_UNSPEC;
285 d65a88a2 2021-09-05 stsp 	hints.ai_socktype = SOCK_STREAM;
286 d65a88a2 2021-09-05 stsp 	eaicode = getaddrinfo(host, port, &hints, &servinfo);
287 d65a88a2 2021-09-05 stsp 	if (eaicode) {
288 d65a88a2 2021-09-05 stsp 		char msg[512];
289 d65a88a2 2021-09-05 stsp 		snprintf(msg, sizeof(msg), "%s: %s", host,
290 d65a88a2 2021-09-05 stsp 		    gai_strerror(eaicode));
291 d65a88a2 2021-09-05 stsp 		return got_error_msg(GOT_ERR_ADDRINFO, msg);
292 d65a88a2 2021-09-05 stsp 	}
293 d65a88a2 2021-09-05 stsp 
294 d65a88a2 2021-09-05 stsp 	for (p = servinfo; p != NULL; p = p->ai_next) {
295 d65a88a2 2021-09-05 stsp 		if ((fd = socket(p->ai_family, p->ai_socktype,
296 d65a88a2 2021-09-05 stsp 		    p->ai_protocol)) == -1)
297 d65a88a2 2021-09-05 stsp 			continue;
298 d65a88a2 2021-09-05 stsp 		if (connect(fd, p->ai_addr, p->ai_addrlen) == 0) {
299 d65a88a2 2021-09-05 stsp 			err = NULL;
300 d65a88a2 2021-09-05 stsp 			break;
301 d65a88a2 2021-09-05 stsp 		}
302 d65a88a2 2021-09-05 stsp 		err = got_error_from_errno("connect");
303 d65a88a2 2021-09-05 stsp 		close(fd);
304 d65a88a2 2021-09-05 stsp 	}
305 7ee8c11a 2022-09-05 thomas 	freeaddrinfo(servinfo);
306 d65a88a2 2021-09-05 stsp 	if (p == NULL)
307 d65a88a2 2021-09-05 stsp 		goto done;
308 d65a88a2 2021-09-05 stsp 
309 d65a88a2 2021-09-05 stsp 	if (asprintf(&cmd, "git-%s-pack %s", direction, path) == -1) {
310 d65a88a2 2021-09-05 stsp 		err = got_error_from_errno("asprintf");
311 d65a88a2 2021-09-05 stsp 		goto done;
312 d65a88a2 2021-09-05 stsp 	}
313 d65a88a2 2021-09-05 stsp 	len = 4 + strlen(cmd) + 1 + strlen("host=") + strlen(host) + 1;
314 d65a88a2 2021-09-05 stsp 	r = dprintf(fd, "%04x%s%chost=%s%c", len, cmd, '\0', host, '\0');
315 d65a88a2 2021-09-05 stsp 	if (r < 0)
316 d65a88a2 2021-09-05 stsp 		err = got_error_from_errno("dprintf");
317 d65a88a2 2021-09-05 stsp done:
318 d65a88a2 2021-09-05 stsp 	free(cmd);
319 d65a88a2 2021-09-05 stsp 	if (err) {
320 d65a88a2 2021-09-05 stsp 		if (fd != -1)
321 d65a88a2 2021-09-05 stsp 			close(fd);
322 d65a88a2 2021-09-05 stsp 	} else
323 d65a88a2 2021-09-05 stsp 		*newfd = fd;
324 d65a88a2 2021-09-05 stsp 	return err;
325 d65a88a2 2021-09-05 stsp }