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86ec8038 AM |
1 | Author: Julien Cristau <jcristau@debian.org> |
2 | Debian-Bug: #644788 | |
3 | ||
4 | Author: Axel Beckert <abe@debian.org> | |
5 | Debian-Bug: #684342 | |
6 | ||
7 | The following patch, while not all that pretty, seems to allow me to | |
8 | attach to a screen started with either the squeeze or sid version. | |
9 | I'm sure there's corner cases, but. | |
10 | ||
11 | Cheers, | |
12 | Julien | |
13 | ||
14 | Index: screen/screen.h | |
15 | =================================================================== | |
16 | --- screen.orig/screen.h 2012-08-09 01:01:28.000000000 +0200 | |
17 | +++ screen/screen.h 2012-08-09 01:01:28.000000000 +0200 | |
18 | @@ -240,6 +240,57 @@ struct msg | |
19 | } m; | |
20 | }; | |
21 | ||
22 | +struct old_msg | |
23 | +{ | |
24 | + int protocol_revision; /* reduce harm done by incompatible messages */ | |
25 | + int type; | |
26 | + char m_tty[MAXPATHLEN]; /* ttyname */ | |
27 | + union | |
28 | + { | |
29 | + struct | |
30 | + { | |
31 | + int lflag; | |
32 | + int aflag; | |
33 | + int flowflag; | |
34 | + int hheight; /* size of scrollback buffer */ | |
35 | + int nargs; | |
36 | + char line[MAXPATHLEN]; | |
37 | + char dir[MAXPATHLEN]; | |
38 | + char screenterm[20]; /* is screen really "screen" ? */ | |
39 | + } | |
40 | + create; | |
41 | + struct | |
42 | + { | |
43 | + char auser[20 + 1]; /* username */ | |
44 | + int apid; /* pid of frontend */ | |
45 | + int adaptflag; /* adapt window size? */ | |
46 | + int lines, columns; /* display size */ | |
47 | + char preselect[20]; | |
48 | + int esc; /* his new escape character unless -1 */ | |
49 | + int meta_esc; /* his new meta esc character unless -1 */ | |
50 | + char envterm[20 + 1]; /* terminal type */ | |
51 | + int encoding; /* encoding of display */ | |
52 | + } | |
53 | + attach; | |
54 | + struct | |
55 | + { | |
56 | + char duser[20 + 1]; /* username */ | |
57 | + int dpid; /* pid of frontend */ | |
58 | + } | |
59 | + detach; | |
60 | + struct | |
61 | + { | |
62 | + char auser[20 + 1]; /* username */ | |
63 | + int nargs; | |
64 | + char cmd[MAXPATHLEN]; /* command */ | |
65 | + int apid; /* pid of frontend */ | |
66 | + char preselect[20]; | |
67 | + } | |
68 | + command; | |
69 | + char message[MAXPATHLEN * 2]; | |
70 | + } m; | |
71 | +}; | |
72 | + | |
73 | /* | |
74 | * And the signals the attacher receives from the backend | |
75 | */ | |
76 | Index: screen/socket.c | |
77 | =================================================================== | |
78 | --- screen.orig/socket.c 2012-08-09 01:01:28.000000000 +0200 | |
79 | +++ screen/socket.c 2012-08-09 01:01:29.000000000 +0200 | |
80 | @@ -1067,7 +1067,9 @@ ReceiveMsg() | |
81 | } | |
82 | if (left > 0) | |
83 | { | |
84 | - if (left != sizeof(m)) | |
85 | + if (left == sizeof(struct msg) - sizeof(struct old_msg)) | |
86 | + ;/* old format message, ignore */ | |
87 | + else if (left != sizeof(m)) | |
88 | Msg(0, "Message %d of %d bytes too small", left, (int)sizeof(m)); | |
89 | else | |
90 | debug("No data on socket.\n"); | |
91 | Index: screen/attacher.c | |
92 | =================================================================== | |
93 | --- screen.orig/attacher.c 2012-08-09 01:01:28.000000000 +0200 | |
94 | +++ screen/attacher.c 2012-08-09 01:32:08.000000000 +0200 | |
95 | @@ -133,6 +133,48 @@ struct msg *m; | |
96 | return 0; | |
97 | } | |
98 | ||
99 | +int | |
100 | +WriteOldMessage(struct msg *m) | |
101 | +{ | |
102 | + sleep(1); /* give the server some time to reopen the pipe */ | |
103 | + if (m->type == MSG_ATTACH && (m->m.attach.detachfirst == MSG_ATTACH || | |
104 | + m->m.attach.detachfirst == MSG_DETACH || | |
105 | + m->m.attach.detachfirst == MSG_POW_DETACH)) | |
106 | + { | |
107 | + struct old_msg old_m; | |
108 | + int s; | |
109 | + int r, l = sizeof(old_m); | |
110 | + | |
111 | + s = MakeClientSocket(0); | |
112 | + if (s < 0) | |
113 | + return 0; | |
114 | + old_m.protocol_revision = (('m'<<24) | ('s'<<16) | ('g'<<8) | 0); | |
115 | + old_m.type = m->type; | |
116 | + memcpy(old_m.m_tty, m->m_tty, sizeof(old_m.m_tty)); | |
117 | + memcpy(old_m.m.attach.auser, m->m.attach.auser, sizeof(old_m.m.attach.auser)); | |
118 | + old_m.m.attach.apid = m->m.attach.apid; | |
119 | + old_m.m.attach.adaptflag = m->m.attach.adaptflag; | |
120 | + old_m.m.attach.lines = m->m.attach.lines; | |
121 | + old_m.m.attach.columns = m->m.attach.columns; | |
122 | + memcpy(old_m.m.attach.preselect, m->m.attach.preselect, sizeof(old_m.m.attach.preselect)); | |
123 | + old_m.m.attach.esc = m->m.attach.esc; | |
124 | + old_m.m.attach.meta_esc = m->m.attach.meta_esc; | |
125 | + memcpy(old_m.m.attach.envterm, m->m.attach.envterm, sizeof(old_m.m.attach.envterm)); | |
126 | + old_m.m.attach.encoding = m->m.attach.encoding; | |
127 | + while(l > 0) | |
128 | + { | |
129 | + r = write(s, (char *)&old_m + (sizeof(struct old_msg) - l), l); | |
130 | + if (r == -1 && errno == EINTR) | |
131 | + continue; | |
132 | + if (r == -1 || r == 0) | |
133 | + return -1; | |
134 | + l -= r; | |
135 | + } | |
136 | + close(s); | |
137 | + } | |
138 | + return 0; | |
139 | +} | |
140 | + | |
141 | ||
142 | int | |
143 | Attach(how) | |
144 | @@ -397,6 +439,7 @@ int how; | |
145 | if (WriteMessage(lasts, &m)) | |
146 | Panic(errno, "WriteMessage"); | |
147 | close(lasts); | |
148 | + WriteOldMessage(&m); | |
149 | debug1("Attach(%d): sent\n", m.type); | |
150 | #ifdef MULTIUSER | |
151 | if (multi && (how == MSG_ATTACH || how == MSG_CONT)) |