| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Communication between server and helper |
| 4 | * |
| 5 | * (c) 2008 Straylight/Edgeware |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This file is part of Trivial IP Encryption (TrIPE). |
| 11 | * |
| 12 | * TrIPE is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * TrIPE is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with TrIPE; if not, write to the Free Software Foundation, |
| 24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 25 | */ |
| 26 | |
| 27 | /*----- Header files ------------------------------------------------------*/ |
| 28 | |
| 29 | #include "priv.h" |
| 30 | |
| 31 | /*----- Global variables --------------------------------------------------*/ |
| 32 | |
| 33 | int pc_fd = 0; /* File descriptor for comms */ |
| 34 | |
| 35 | /*----- Main code ---------------------------------------------------------*/ |
| 36 | |
| 37 | /* --- @pc_put@ --- * |
| 38 | * |
| 39 | * Arguments: @const void *p@ = pointer to buffer |
| 40 | * @size_t sz@ = size of the buffer |
| 41 | * |
| 42 | * Returns: Zero on success, @-1@ on error (and @errno@ set). |
| 43 | * |
| 44 | * Use: Writes a buffer, handling short writes and other bogosity. |
| 45 | */ |
| 46 | |
| 47 | int pc_put(const void *p, size_t sz) |
| 48 | { |
| 49 | ssize_t n; |
| 50 | const unsigned char *pp = p; |
| 51 | |
| 52 | while (sz) { |
| 53 | n = write(pc_fd, pp, sz); |
| 54 | if (n < 0) { |
| 55 | if (errno == EINTR) |
| 56 | continue; |
| 57 | return (-1); |
| 58 | } |
| 59 | if (n == 0) { |
| 60 | errno = EIO; |
| 61 | return (-1); |
| 62 | } |
| 63 | pp += n; sz -= n; |
| 64 | } |
| 65 | return (0); |
| 66 | } |
| 67 | |
| 68 | /* --- @pc_puterr@, @pc_putuint@, @pc_putsz@ --- * |
| 69 | * |
| 70 | * Arguments: @int err@ = error number to write |
| 71 | * @uint u@ = unsigned integer to write |
| 72 | * @size_t sz@ = size to write |
| 73 | * |
| 74 | * Returns: Zero on success, @-1@ on error (and @errno@ set). |
| 75 | * |
| 76 | * Use: Sends an error/integer/size. |
| 77 | */ |
| 78 | |
| 79 | #define PUT(abbr, type) \ |
| 80 | int pc_put##abbr(type x) { return (pc_put(&x, sizeof(x))); } |
| 81 | COMM_TYPES(PUT) |
| 82 | |
| 83 | /* --- @pc_putstring@ --- * |
| 84 | * |
| 85 | * Arguments: @const char *s@ = pointer to string to write |
| 86 | * |
| 87 | * Returns: Zero on success, @-1@ on error (and @errno@ set). |
| 88 | * |
| 89 | * Use: Sends a string. |
| 90 | */ |
| 91 | |
| 92 | int pc_putstring(const char *s) |
| 93 | { |
| 94 | size_t sz = strlen(s); |
| 95 | |
| 96 | if (pc_putsz(sz) || pc_put(s, sz)) |
| 97 | return (-1); |
| 98 | return (0); |
| 99 | } |
| 100 | |
| 101 | /* --- @pc_get@ --- * |
| 102 | * |
| 103 | * Arguments: @void *p@ = pointer to buffer |
| 104 | * @size_t sz@ = size of the buffer |
| 105 | * |
| 106 | * Returns: Zero on success, @-1@ on error (and @errno@ set). |
| 107 | * |
| 108 | * Use: Receives a buffer, handling short reads and other bogosity. |
| 109 | */ |
| 110 | |
| 111 | int pc_get(void *p, size_t sz) |
| 112 | { |
| 113 | ssize_t n; |
| 114 | unsigned char *pp = p; |
| 115 | |
| 116 | while (sz) { |
| 117 | n = read(pc_fd, pp, sz); |
| 118 | if (n < 0) { |
| 119 | if (errno == EINTR) |
| 120 | continue; |
| 121 | else if (errno == ECONNRESET) |
| 122 | errno = -1; |
| 123 | return (-1); |
| 124 | } |
| 125 | if (n == 0) { |
| 126 | errno = -1; |
| 127 | return (-1); |
| 128 | } |
| 129 | pp += n; sz -= n; |
| 130 | } |
| 131 | return (0); |
| 132 | } |
| 133 | |
| 134 | /* --- @pc_geterr@, @pc_getuint@, @pc_getsz@ --- * |
| 135 | * |
| 136 | * Arguments: @int *err@ = where to put the error number |
| 137 | * @uint *u@ = where to put the unsigned integer |
| 138 | * @size_t *sz@ = where to put the size |
| 139 | * |
| 140 | * Returns: Zero on success, @-1@ on error (and @errno@ set). |
| 141 | * |
| 142 | * Use: Receives an error/integer/size. |
| 143 | */ |
| 144 | |
| 145 | #define GET(abbr, type) \ |
| 146 | int pc_get##abbr(type *x) { return (pc_get(x, sizeof(*x))); } |
| 147 | COMM_TYPES(GET) |
| 148 | |
| 149 | /* --- @pc_getstring@ --- * |
| 150 | * |
| 151 | * Arguments: @dstr *d@ = where to pc_put the string |
| 152 | * |
| 153 | * Returns: Zero on success, @-1@ on error (and @errno@ set). |
| 154 | * |
| 155 | * Use: Receives a string. |
| 156 | */ |
| 157 | |
| 158 | int pc_getstring(dstr *d) |
| 159 | { |
| 160 | size_t sz; |
| 161 | |
| 162 | if (pc_getsz(&sz)) |
| 163 | return (-1); |
| 164 | DENSURE(d, sz + 1); |
| 165 | if (pc_get(d->buf + d->len, sz)) |
| 166 | return (-1); |
| 167 | d->len += sz; |
| 168 | d->buf[d->len] = 0; |
| 169 | return (0); |
| 170 | } |
| 171 | |
| 172 | /*----- That's all, folks -------------------------------------------------*/ |