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Annotation of src/usr.bin/ssh/sshbuf-io.c, Revision 1.1

1.1     ! djm         1: /*     $OpenBSD$ */
        !             2: /*
        !             3:  * Copyright (c) 2011 Damien Miller
        !             4:  *
        !             5:  * Permission to use, copy, modify, and distribute this software for any
        !             6:  * purpose with or without fee is hereby granted, provided that the above
        !             7:  * copyright notice and this permission notice appear in all copies.
        !             8:  *
        !             9:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !            10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            11:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            15:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            16:  */
        !            17:
        !            18: #include <sys/types.h>
        !            19: #include <sys/stat.h>
        !            20:
        !            21: #include <errno.h>
        !            22: #include <fcntl.h>
        !            23: #include <unistd.h>
        !            24: #include <string.h>
        !            25:
        !            26: #include "ssherr.h"
        !            27: #define SSHBUF_INTERNAL
        !            28: #include "sshbuf.h"
        !            29: #include "atomicio.h"
        !            30:
        !            31: /* Load a file from a fd into a buffer */
        !            32: int
        !            33: sshbuf_load_fd(int fd, struct sshbuf **blobp)
        !            34: {
        !            35:        u_char buf[4096];
        !            36:        size_t len;
        !            37:        struct stat st;
        !            38:        int r;
        !            39:        struct sshbuf *blob;
        !            40:
        !            41:        *blobp = NULL;
        !            42:
        !            43:        if (fstat(fd, &st) == -1)
        !            44:                return SSH_ERR_SYSTEM_ERROR;
        !            45:        if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 &&
        !            46:            st.st_size > SSHBUF_SIZE_MAX)
        !            47:                return SSH_ERR_INVALID_FORMAT;
        !            48:        if ((blob = sshbuf_new()) == NULL)
        !            49:                return SSH_ERR_ALLOC_FAIL;
        !            50:        for (;;) {
        !            51:                if ((len = atomicio(read, fd, buf, sizeof(buf))) == 0) {
        !            52:                        if (errno == EPIPE)
        !            53:                                break;
        !            54:                        r = SSH_ERR_SYSTEM_ERROR;
        !            55:                        goto out;
        !            56:                }
        !            57:                if ((r = sshbuf_put(blob, buf, len)) != 0)
        !            58:                        goto out;
        !            59:                if (sshbuf_len(blob) > SSHBUF_SIZE_MAX) {
        !            60:                        r = SSH_ERR_INVALID_FORMAT;
        !            61:                        goto out;
        !            62:                }
        !            63:        }
        !            64:        if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 &&
        !            65:            st.st_size != (off_t)sshbuf_len(blob)) {
        !            66:                r = SSH_ERR_FILE_CHANGED;
        !            67:                goto out;
        !            68:        }
        !            69:        /* success */
        !            70:        *blobp = blob;
        !            71:        blob = NULL; /* transferred */
        !            72:        r = 0;
        !            73:  out:
        !            74:        explicit_bzero(buf, sizeof(buf));
        !            75:        sshbuf_free(blob);
        !            76:        return r;
        !            77: }
        !            78:
        !            79: int
        !            80: sshbuf_load_file(const char *path, struct sshbuf **bufp)
        !            81: {
        !            82:        int r, fd, oerrno;
        !            83:
        !            84:        *bufp = NULL;
        !            85:        if ((fd = open(path, O_RDONLY)) == -1)
        !            86:                return SSH_ERR_SYSTEM_ERROR;
        !            87:        if ((r = sshbuf_load_fd(fd, bufp)) != 0)
        !            88:                goto out;
        !            89:        /* success */
        !            90:        r = 0;
        !            91:  out:
        !            92:        oerrno = errno;
        !            93:        close(fd);
        !            94:        if (r != 0)
        !            95:                errno = oerrno;
        !            96:        return r;
        !            97: }
        !            98:
        !            99: int
        !           100: sshbuf_write_file(const char *path, struct sshbuf *buf)
        !           101: {
        !           102:        int fd, oerrno;
        !           103:
        !           104:        if ((fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644)) == -1)
        !           105:                return SSH_ERR_SYSTEM_ERROR;
        !           106:        if (atomicio(vwrite, fd, sshbuf_mutable_ptr(buf),
        !           107:            sshbuf_len(buf)) != sshbuf_len(buf) || close(fd) != 0) {
        !           108:                oerrno = errno;
        !           109:                close(fd);
        !           110:                unlink(path);
        !           111:                errno = oerrno;
        !           112:                return SSH_ERR_SYSTEM_ERROR;
        !           113:        }
        !           114:        return 0;
        !           115: }
        !           116: