1 /*
2 * For license terms, see the file COPYING in this directory.
3 */
4
5 /***********************************************************************
6 module: getpass.c
7 project: fetchmail
8 programmer: Carl Harris, ceharris@mal.com
9 description: getpass() replacement which allows for long passwords.
10 This version hacked by Wilfred Teiken, allowing the
11 password to be piped to fetchmail.
12
13 ***********************************************************************/
14
15 #include "config.h"
16
17 #include <stdio.h>
18 #include <signal.h>
19 #include <fcntl.h>
20 #include <stdlib.h>
21 #if defined(HAVE_UNISTD_H)
22 #include <unistd.h>
23 #endif
24 #include "fetchmail.h"
25 #include "i18n.h"
26
27 #define INPUT_BUF_SIZE PASSWORDLEN
28
29 #if defined(HAVE_TERMIOS_H) && defined(HAVE_TCSETATTR)
30 # include <termios.h>
31 #else
32 #if defined(HAVE_TERMIO_H)
33 # include <sys/ioctl.h>
34 # include <termio.h>
35 #else
36 #if defined(HAVE_SGTTY_H)
37 # include <sgtty.h>
38 #endif
39 #endif
40 #endif
41
42 static int ttyfd;
43
44 #if defined(HAVE_TCSETATTR)
45 static struct termios termb;
46 static tcflag_t flags;
47 #else
48 #if defined(HAVE_TERMIO_H)
49 static struct termio termb;
50 static unsigned short flags;
51 #else
52 #if defined(HAVE_STTY)
53 static struct sgttyb ttyb;
54 static int flags;
55 #endif
56 #endif
57 #endif
58
59 static void save_tty_state(void);
60 static void disable_tty_echo(void);
61 static void restore_tty_state(void);
62 static RETSIGTYPE sigint_handler(int);
63
fm_getpassword(char * prompt)64 char *fm_getpassword(char *prompt)
65 {
66 #if !(defined(HAVE_TCSETATTR) || defined(HAVE_TERMIO_H) || defined(HAVE_STTY))
67 #if defined(HAVE_GETPASS)
68 char *getpass();
69 return getpass(prompt);
70 #else
71 fputs(GT_("ERROR: no support for getpassword() routine\n"),stderr);
72 exit(1);
73 #endif
74 #else
75 char *p;
76 int c;
77 FILE *fi;
78 static char pbuf[INPUT_BUF_SIZE];
79 SIGHANDLERTYPE sig = 0; /* initialization pacifies -Wall */
80
81 int istty = isatty(0);
82
83 /* get the file descriptor for the actual input device if it's a tty */
84 if (istty)
85 {
86 if ((fi = fdopen(open("/dev/tty", 2), "r")) == NULL)
87 fi = stdin;
88 else
89 setbuf(fi, (char *)NULL);
90 }
91 else
92 fi = stdin;
93
94 /* store descriptor for the tty */
95 ttyfd = fileno(fi);
96
97 if (istty)
98 {
99 /* preserve tty state before turning off echo */
100 save_tty_state();
101
102 /* now that we have the current tty state, we can catch SIGINT and
103 exit gracefully */
104 sig = set_signal_handler(SIGINT, sigint_handler);
105
106 /* turn off echo on the tty */
107 disable_tty_echo();
108
109 /* display the prompt and get the input string */
110 fprintf(stderr, "%s", prompt);
111 }
112
113 for (p = pbuf; (c = getc(fi))!='\n' && c!=EOF;)
114 {
115 if (p < &pbuf[INPUT_BUF_SIZE - 1])
116 *p++ = c;
117 }
118 *p = '\0';
119
120 /* write a newline so cursor won't appear to hang */
121 if (fi != stdin)
122 fprintf(stderr, "\n");
123
124 if (istty)
125 {
126 /* restore previous state of the tty */
127 restore_tty_state();
128
129 /* restore previous state of SIGINT */
130 set_signal_handler(SIGINT, sig);
131 }
132 if (fi != stdin)
133 fclose(fi); /* not checking should be safe, file mode was "r" */
134
135 return(pbuf);
136 #endif /* !(defined(HAVE_TCSETATTR) || ... */
137 }
138
save_tty_state(void)139 static void save_tty_state (void)
140 {
141 #if defined(HAVE_TCSETATTR)
142 tcgetattr(ttyfd, &termb);
143 flags = termb.c_lflag;
144 #else
145 #if defined(HAVE_TERMIO_H)
146 ioctl(ttyfd, TCGETA, (char *) &termb);
147 flags = termb.c_lflag;
148 #else /* we HAVE_STTY */
149 gtty(ttyfd, &ttyb);
150 flags = ttyb.sg_flags;
151 #endif
152 #endif
153 }
154
disable_tty_echo(void)155 static void disable_tty_echo(void)
156 {
157 /* turn off echo on the tty */
158 #if defined(HAVE_TCSETATTR)
159 termb.c_lflag &= ~ECHO;
160 tcsetattr(ttyfd, TCSAFLUSH, &termb);
161 #else
162 #if defined(HAVE_TERMIO_H)
163 termb.c_lflag &= ~ECHO;
164 ioctl(ttyfd, TCSETA, (char *) &termb);
165 #else /* we HAVE_STTY */
166 ttyb.sg_flags &= ~ECHO;
167 stty(ttyfd, &ttyb);
168 #endif
169 #endif
170 }
171
restore_tty_state(void)172 static void restore_tty_state(void)
173 {
174 /* restore previous tty echo state */
175 #if defined(HAVE_TCSETATTR)
176 termb.c_lflag = flags;
177 tcsetattr(ttyfd, TCSAFLUSH, &termb);
178 #else
179 #if defined(HAVE_TERMIO_H)
180 termb.c_lflag = flags;
181 ioctl(ttyfd, TCSETA, (char *) &termb);
182 #else /* we HAVE_STTY */
183 ttyb.sg_flags = flags;
184 stty(ttyfd, &ttyb);
185 #endif
186 #endif
187 }
188
sigint_handler(int signum)189 static RETSIGTYPE sigint_handler(int signum)
190 {
191 (void)signum;
192 restore_tty_state();
193 report(stderr, GT_("\nCaught SIGINT... bailing out.\n"));
194 exit(1);
195 }
196
197 /* getpass.c ends here */
198