1 511a516b 2018-05-19 stsp /*
  2 511a516b 2018-05-19 stsp  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
  3 511a516b 2018-05-19 stsp  *
  4 511a516b 2018-05-19 stsp  * Permission to use, copy, modify, and distribute this software for any
  5 511a516b 2018-05-19 stsp  * purpose with or without fee is hereby granted, provided that the above
  6 511a516b 2018-05-19 stsp  * copyright notice and this permission notice appear in all copies.
  7 511a516b 2018-05-19 stsp  *
  8 511a516b 2018-05-19 stsp  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 511a516b 2018-05-19 stsp  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 511a516b 2018-05-19 stsp  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 511a516b 2018-05-19 stsp  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 511a516b 2018-05-19 stsp  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 511a516b 2018-05-19 stsp  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 511a516b 2018-05-19 stsp  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 511a516b 2018-05-19 stsp  */
 16 511a516b 2018-05-19 stsp 
 17 511a516b 2018-05-19 stsp #include <limits.h>
 18 511a516b 2018-05-19 stsp #include <stdlib.h>
 19 511a516b 2018-05-19 stsp #include <unistd.h>
 20 511a516b 2018-05-19 stsp #include <string.h>
 21 511a516b 2018-05-19 stsp #include <stdio.h>
 22 511a516b 2018-05-19 stsp 
 23 dd038bc6 2021-09-21 thomas.ad #include "got_compat.h"
 24 dd038bc6 2021-09-21 thomas.ad 
 25 511a516b 2018-05-19 stsp #include "got_opentemp.h"
 26 511a516b 2018-05-19 stsp #include "got_error.h"
 27 511a516b 2018-05-19 stsp 
 28 511a516b 2018-05-19 stsp int
 29 511a516b 2018-05-19 stsp got_opentempfd(void)
 30 511a516b 2018-05-19 stsp {
 31 511a516b 2018-05-19 stsp 	char name[PATH_MAX];
 32 511a516b 2018-05-19 stsp 	int fd;
 33 511a516b 2018-05-19 stsp 
 34 bb63914a 2020-02-17 stsp 	if (strlcpy(name, GOT_TMPDIR_STR "/got.XXXXXXXX", sizeof(name))
 35 bb63914a 2020-02-17 stsp 	    >= sizeof(name))
 36 511a516b 2018-05-19 stsp 		return -1;
 37 511a516b 2018-05-19 stsp 
 38 511a516b 2018-05-19 stsp 	fd = mkstemp(name);
 39 e1e77cc4 2020-03-17 stsp 	if (fd != -1)
 40 e1e77cc4 2020-03-17 stsp 		unlink(name);
 41 511a516b 2018-05-19 stsp 	return fd;
 42 511a516b 2018-05-19 stsp }
 43 511a516b 2018-05-19 stsp 
 44 511a516b 2018-05-19 stsp FILE *
 45 511a516b 2018-05-19 stsp got_opentemp(void)
 46 511a516b 2018-05-19 stsp {
 47 511a516b 2018-05-19 stsp 	int fd;
 48 511a516b 2018-05-19 stsp 	FILE *f;
 49 511a516b 2018-05-19 stsp 
 50 511a516b 2018-05-19 stsp 	fd = got_opentempfd();
 51 511a516b 2018-05-19 stsp 	if (fd < 0)
 52 511a516b 2018-05-19 stsp 		return NULL;
 53 511a516b 2018-05-19 stsp 
 54 511a516b 2018-05-19 stsp 	f = fdopen(fd, "w+");
 55 511a516b 2018-05-19 stsp 	if (f == NULL) {
 56 511a516b 2018-05-19 stsp 		close(fd);
 57 511a516b 2018-05-19 stsp 		return NULL;
 58 511a516b 2018-05-19 stsp 	}
 59 511a516b 2018-05-19 stsp 
 60 511a516b 2018-05-19 stsp 	return f;
 61 511a516b 2018-05-19 stsp }
 62 511a516b 2018-05-19 stsp 
 63 511a516b 2018-05-19 stsp const struct got_error *
 64 511a516b 2018-05-19 stsp got_opentemp_named(char **path, FILE **outfile, const char *basepath)
 65 511a516b 2018-05-19 stsp {
 66 511a516b 2018-05-19 stsp 	const struct got_error *err = NULL;
 67 511a516b 2018-05-19 stsp 	int fd;
 68 511a516b 2018-05-19 stsp 
 69 0c92744a 2018-09-20 stsp 	*outfile = NULL;
 70 0c92744a 2018-09-20 stsp 
 71 511a516b 2018-05-19 stsp 	if (asprintf(path, "%s-XXXXXX", basepath) == -1) {
 72 511a516b 2018-05-19 stsp 		*path = NULL;
 73 638f9024 2019-05-13 stsp 		return got_error_from_errno("asprintf");
 74 511a516b 2018-05-19 stsp 	}
 75 511a516b 2018-05-19 stsp 
 76 511a516b 2018-05-19 stsp 	fd = mkstemp(*path);
 77 511a516b 2018-05-19 stsp 	if (fd == -1) {
 78 0d0c539e 2019-05-22 jcs 		err = got_error_from_errno2("mkstemp", *path);
 79 511a516b 2018-05-19 stsp 		free(*path);
 80 511a516b 2018-05-19 stsp 		*path = NULL;
 81 511a516b 2018-05-19 stsp 		return err;
 82 511a516b 2018-05-19 stsp 	}
 83 511a516b 2018-05-19 stsp 
 84 511a516b 2018-05-19 stsp 	*outfile = fdopen(fd, "w+");
 85 511a516b 2018-05-19 stsp 	if (*outfile == NULL) {
 86 0d0c539e 2019-05-22 jcs 		err = got_error_from_errno2("fdopen", *path);
 87 511a516b 2018-05-19 stsp 		free(*path);
 88 511a516b 2018-05-19 stsp 		*path = NULL;
 89 511a516b 2018-05-19 stsp 	}
 90 511a516b 2018-05-19 stsp 
 91 511a516b 2018-05-19 stsp 	return err;
 92 511a516b 2018-05-19 stsp }
 93 507dc3bb 2018-12-29 stsp 
 94 507dc3bb 2018-12-29 stsp const struct got_error *
 95 507dc3bb 2018-12-29 stsp got_opentemp_named_fd(char **path, int *outfd, const char *basepath)
 96 507dc3bb 2018-12-29 stsp {
 97 507dc3bb 2018-12-29 stsp 	const struct got_error *err = NULL;
 98 507dc3bb 2018-12-29 stsp 	int fd;
 99 507dc3bb 2018-12-29 stsp 
100 507dc3bb 2018-12-29 stsp 	*outfd = -1;
101 507dc3bb 2018-12-29 stsp 
102 507dc3bb 2018-12-29 stsp 	if (asprintf(path, "%s-XXXXXX", basepath) == -1) {
103 507dc3bb 2018-12-29 stsp 		*path = NULL;
104 638f9024 2019-05-13 stsp 		return got_error_from_errno("asprintf");
105 507dc3bb 2018-12-29 stsp 	}
106 507dc3bb 2018-12-29 stsp 
107 507dc3bb 2018-12-29 stsp 	fd = mkstemp(*path);
108 507dc3bb 2018-12-29 stsp 	if (fd == -1) {
109 638f9024 2019-05-13 stsp 		err = got_error_from_errno("mkstemp");
110 507dc3bb 2018-12-29 stsp 		free(*path);
111 507dc3bb 2018-12-29 stsp 		*path = NULL;
112 507dc3bb 2018-12-29 stsp 		return err;
113 507dc3bb 2018-12-29 stsp 	}
114 507dc3bb 2018-12-29 stsp 
115 507dc3bb 2018-12-29 stsp 	*outfd = fd;
116 507dc3bb 2018-12-29 stsp 	return err;
117 507dc3bb 2018-12-29 stsp }
118 1758cce7 2022-06-13 thomas 
119 1758cce7 2022-06-13 thomas const struct got_error *
120 1758cce7 2022-06-13 thomas got_opentemp_truncate(FILE *f)
121 1758cce7 2022-06-13 thomas {
122 1758cce7 2022-06-13 thomas 	if (fpurge(f) == EOF)
123 1758cce7 2022-06-13 thomas 		return got_error_from_errno("fpurge");
124 1758cce7 2022-06-13 thomas 	if (ftruncate(fileno(f), 0L) == -1)
125 1758cce7 2022-06-13 thomas 		return got_error_from_errno("ftruncate");
126 1758cce7 2022-06-13 thomas 	if (fseeko(f, 0L, SEEK_SET) == -1)
127 1758cce7 2022-06-13 thomas 		return got_error_from_errno("fseeko");
128 1758cce7 2022-06-13 thomas 	return NULL;
129 1758cce7 2022-06-13 thomas }