1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef lint 33 #endif /* not lint */ 34 #include <sys/cdefs.h> 35 /* 36 * Mail -- a mail program 37 * 38 * Generally useful tty stuff. 39 */ 40 41 #include "rcv.h" 42 #include "extern.h" 43 44 static cc_t c_erase; /* Current erase char */ 45 static cc_t c_kill; /* Current kill char */ 46 static jmp_buf rewrite; /* Place to go when continued */ 47 static jmp_buf intjmp; /* Place to go when interrupted */ 48 #ifndef TIOCSTI 49 static int ttyset; /* We must now do erase/kill */ 50 #endif 51 52 /* 53 * Read all relevant header fields. 54 */ 55 56 int 57 grabh(struct header *hp, int gflags) 58 { 59 struct termios ttybuf; 60 sig_t saveint; 61 sig_t savetstp; 62 sig_t savettou; 63 sig_t savettin; 64 int errs; 65 #ifndef TIOCSTI 66 sig_t savequit; 67 #else 68 # ifdef TIOCEXT 69 int extproc, flag; 70 # endif /* TIOCEXT */ 71 #endif /* TIOCSTI */ 72 73 savetstp = signal(SIGTSTP, SIG_DFL); 74 savettou = signal(SIGTTOU, SIG_DFL); 75 savettin = signal(SIGTTIN, SIG_DFL); 76 errs = 0; 77 #ifndef TIOCSTI 78 ttyset = 0; 79 #endif 80 if (tcgetattr(fileno(stdin), &ttybuf) < 0) { 81 warn("tcgetattr(stdin)"); 82 return (-1); 83 } 84 c_erase = ttybuf.c_cc[VERASE]; 85 c_kill = ttybuf.c_cc[VKILL]; 86 #ifndef TIOCSTI 87 ttybuf.c_cc[VERASE] = _POSIX_VDISABLE; 88 ttybuf.c_cc[VKILL] = _POSIX_VDISABLE; 89 if ((saveint = signal(SIGINT, SIG_IGN)) == SIG_DFL) 90 (void)signal(SIGINT, SIG_DFL); 91 if ((savequit = signal(SIGQUIT, SIG_IGN)) == SIG_DFL) 92 (void)signal(SIGQUIT, SIG_DFL); 93 #else 94 # ifdef TIOCEXT 95 extproc = ((ttybuf.c_lflag & EXTPROC) ? 1 : 0); 96 if (extproc) { 97 flag = 0; 98 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 99 warn("TIOCEXT: off"); 100 } 101 # endif /* TIOCEXT */ 102 if (setjmp(intjmp)) 103 goto out; 104 saveint = signal(SIGINT, ttyint); 105 #endif 106 if (gflags & GTO) { 107 #ifndef TIOCSTI 108 if (!ttyset && hp->h_to != NULL) 109 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 110 #endif 111 hp->h_to = 112 extract(readtty("To: ", detract(hp->h_to, 0)), GTO); 113 } 114 if (gflags & GSUBJECT) { 115 #ifndef TIOCSTI 116 if (!ttyset && hp->h_subject != NULL) 117 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 118 #endif 119 hp->h_subject = readtty("Subject: ", hp->h_subject); 120 } 121 if (gflags & GCC) { 122 #ifndef TIOCSTI 123 if (!ttyset && hp->h_cc != NULL) 124 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 125 #endif 126 hp->h_cc = 127 extract(readtty("Cc: ", detract(hp->h_cc, 0)), GCC); 128 } 129 if (gflags & GBCC) { 130 #ifndef TIOCSTI 131 if (!ttyset && hp->h_bcc != NULL) 132 ttyset++, tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 133 #endif 134 hp->h_bcc = 135 extract(readtty("Bcc: ", detract(hp->h_bcc, 0)), GBCC); 136 } 137 #ifdef TIOCSTI 138 out: 139 #endif 140 (void)signal(SIGTSTP, savetstp); 141 (void)signal(SIGTTOU, savettou); 142 (void)signal(SIGTTIN, savettin); 143 #ifndef TIOCSTI 144 ttybuf.c_cc[VERASE] = c_erase; 145 ttybuf.c_cc[VKILL] = c_kill; 146 if (ttyset) 147 tcsetattr(fileno(stdin), TCSADRAIN, &ttybuf); 148 (void)signal(SIGQUIT, savequit); 149 #else 150 # ifdef TIOCEXT 151 if (extproc) { 152 flag = 1; 153 if (ioctl(fileno(stdin), TIOCEXT, &flag) < 0) 154 warn("TIOCEXT: on"); 155 } 156 # endif /* TIOCEXT */ 157 #endif 158 (void)signal(SIGINT, saveint); 159 return (errs); 160 } 161 162 /* 163 * Read up a header from standard input. 164 * The source string has the preliminary contents to 165 * be read. 166 * 167 */ 168 169 char * 170 readtty(const char *pr, char src[]) 171 { 172 char canonb[BUFSIZ]; 173 #ifdef TIOCSTI 174 char ch; 175 #endif 176 int c; 177 char *cp, *cp2; 178 179 fputs(pr, stdout); 180 (void)fflush(stdout); 181 if (src != NULL && strlen(src) > BUFSIZ - 2) { 182 printf("too long to edit\n"); 183 return (src); 184 } 185 #ifndef TIOCSTI 186 if (src != NULL) 187 strlcpy(canonb, src, sizeof(canonb)); 188 else 189 *canonb = '\0'; 190 fputs(canonb, stdout); 191 (void)fflush(stdout); 192 #else 193 cp = src == NULL ? "" : src; 194 while ((c = *cp++) != '\0') { 195 if ((c_erase != _POSIX_VDISABLE && c == c_erase) || 196 (c_kill != _POSIX_VDISABLE && c == c_kill)) { 197 ch = '\\'; 198 ioctl(0, TIOCSTI, &ch); 199 } 200 ch = c; 201 ioctl(0, TIOCSTI, &ch); 202 } 203 cp = canonb; 204 *cp = '\0'; 205 #endif 206 cp2 = cp; 207 while (cp2 < canonb + BUFSIZ) 208 *cp2++ = '\0'; 209 cp2 = cp; 210 if (setjmp(rewrite)) 211 goto redo; 212 (void)signal(SIGTSTP, ttystop); 213 (void)signal(SIGTTOU, ttystop); 214 (void)signal(SIGTTIN, ttystop); 215 clearerr(stdin); 216 while (cp2 < canonb + BUFSIZ) { 217 c = getc(stdin); 218 if (c == EOF || c == '\n') 219 break; 220 *cp2++ = c; 221 } 222 *cp2 = '\0'; 223 (void)signal(SIGTSTP, SIG_DFL); 224 (void)signal(SIGTTOU, SIG_DFL); 225 (void)signal(SIGTTIN, SIG_DFL); 226 if (c == EOF && ferror(stdin)) { 227 redo: 228 cp = strlen(canonb) > 0 ? canonb : NULL; 229 clearerr(stdin); 230 return (readtty(pr, cp)); 231 } 232 #ifndef TIOCSTI 233 if (cp == NULL || *cp == '\0') 234 return (src); 235 cp2 = cp; 236 if (!ttyset) 237 return (strlen(canonb) > 0 ? savestr(canonb) : NULL); 238 while (*cp != '\0') { 239 c = *cp++; 240 if (c_erase != _POSIX_VDISABLE && c == c_erase) { 241 if (cp2 == canonb) 242 continue; 243 if (cp2[-1] == '\\') { 244 cp2[-1] = c; 245 continue; 246 } 247 cp2--; 248 continue; 249 } 250 if (c_kill != _POSIX_VDISABLE && c == c_kill) { 251 if (cp2 == canonb) 252 continue; 253 if (cp2[-1] == '\\') { 254 cp2[-1] = c; 255 continue; 256 } 257 cp2 = canonb; 258 continue; 259 } 260 *cp2++ = c; 261 } 262 *cp2 = '\0'; 263 #endif 264 if (equal("", canonb)) 265 return (NULL); 266 return (savestr(canonb)); 267 } 268 269 /* 270 * Receipt continuation. 271 */ 272 void 273 ttystop(int s) 274 { 275 sig_t old_action = signal(s, SIG_DFL); 276 sigset_t nset; 277 278 (void)sigemptyset(&nset); 279 (void)sigaddset(&nset, s); 280 (void)sigprocmask(SIG_BLOCK, &nset, NULL); 281 kill(0, s); 282 (void)sigprocmask(SIG_UNBLOCK, &nset, NULL); 283 (void)signal(s, old_action); 284 longjmp(rewrite, 1); 285 } 286 287 void 288 ttyint(int s __unused) 289 { 290 longjmp(intjmp, 1); 291 } 292