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1 | #include <stdio.h> | |
2 | #include <string.h> | |
3 | #include <assert.h> | |
4 | #include "../lib/irc_string.h" | |
5 | #include "../lib/version.h" | |
6 | #include "../core/schedule.h" | |
7 | #include "../irc/irc.h" | |
8 | #include "../trusts/trusts.h" | |
9 | #include "../control/control.h" | |
10 | #include "glines.h" | |
11 | ||
12 | /** Find canonical user and host for a string. | |
13 | * If \a userhost starts with '$', assign \a userhost to *user_p and NULL to *host_p. | |
14 | * Otherwise, if \a userhost contains '@', assign the earlier part of it to *user_p and the rest to *host_p. | |
15 | * Otherwise, assign \a def_user to *user_p and \a userhost to *host_p. | |
16 | * | |
17 | * @param[in] userhost Input string from user. | |
18 | * @param[out] nick_p Gets pointer to nick part of hostmask. | |
19 | * @param[out] user_p Gets pointer to user (or channel/realname) part of hostmask. | |
20 | * @param[out] host_p Gets point to host part of hostmask (may be assigned NULL). | |
21 | * @param[in] def_user Default value for user part. | |
22 | */ | |
23 | static void | |
24 | canon_userhost(char *userhost, char **nick_p, char **user_p, char **host_p, char *def_user) { | |
25 | char *tmp, *s; | |
26 | ||
27 | if (*userhost == '$') { | |
28 | *user_p = userhost; | |
29 | *host_p = NULL; | |
30 | *nick_p = NULL; | |
31 | return; | |
32 | } | |
33 | ||
34 | if ((tmp = strchr(userhost, '!'))) { | |
35 | *nick_p = userhost; | |
36 | *(tmp++) = '\0'; | |
37 | } else { | |
38 | *nick_p = def_user; | |
39 | tmp = userhost; | |
40 | } | |
41 | ||
42 | if (!(s = strchr(tmp, '@'))) { | |
43 | *user_p = def_user; | |
44 | *host_p = tmp; | |
45 | } else { | |
46 | *user_p = tmp; | |
47 | *(s++) = '\0'; | |
48 | *host_p = s; | |
49 | } | |
50 | } | |
51 | ||
52 | gline *makegline(const char *mask) { | |
53 | /* populate gl-> user,host,node,nick and set appropriate flags */ | |
54 | gline *gl; | |
55 | char dupmask[512]; | |
56 | char *nick, *user, *host; | |
57 | const char *pos; | |
58 | int count; | |
59 | ||
60 | /* Make sure there are no spaces in the mask */ | |
61 | if (strchr(mask, ' ') != NULL) | |
62 | return NULL; | |
63 | ||
64 | gl = newgline(); | |
65 | ||
66 | if (!gl) { | |
67 | Error("gline", ERR_ERROR, "Failed to allocate new gline"); | |
68 | return NULL; | |
69 | } | |
70 | ||
71 | if (mask[0] == '#' || mask[0] == '&') { | |
72 | gl->flags |= GLINE_BADCHAN; | |
73 | gl->user = getsstring(mask, CHANNELLEN); | |
74 | return gl; | |
75 | } | |
76 | ||
77 | if (mask[0] == '$') { | |
78 | if (mask[1] != 'R') { | |
79 | freegline(gl); | |
80 | return NULL; | |
81 | } | |
82 | ||
83 | gl->flags |= GLINE_REALNAME; | |
84 | ||
85 | if (strcmp(mask + 2, "*") != 0) | |
86 | gl->user = getsstring(mask + 2, REALLEN); | |
87 | ||
88 | return gl; | |
89 | } | |
90 | ||
91 | strncpy(dupmask, mask, sizeof(dupmask)); | |
92 | canon_userhost(dupmask, &nick, &user, &host, "*"); | |
93 | ||
94 | if (ipmask_parse(host, &gl->ip, &gl->bits)) | |
95 | gl->flags |= GLINE_IPMASK; | |
96 | else | |
97 | gl->flags |= GLINE_HOSTMASK; | |
98 | ||
99 | /* Don't allow invalid IPv6 bans as those might match * on snircd 1.3.4 */ | |
100 | count = 0; | |
101 | ||
102 | for (pos = host; *pos; pos++) | |
103 | if (*pos == ':') | |
104 | count++; | |
105 | ||
106 | if (count >= 8) { | |
107 | controlwall(NO_OPER, NL_GLINES_AUTO, "Warning: Parsed invalid IPv6 G-Line: %s", mask); | |
108 | freegline(gl); | |
109 | return NULL; | |
110 | } | |
111 | ||
112 | if (strcmp(nick, "*") != 0) | |
113 | gl->nick = getsstring(nick, 512); | |
114 | ||
115 | if (strcmp(user, "*") != 0) | |
116 | gl->user = getsstring(user, 512); | |
117 | ||
118 | if (strcmp(host, "*") != 0) | |
119 | gl->host = getsstring(host, 512); | |
120 | ||
121 | return gl; | |
122 | } | |
123 | ||
124 | char *glinetostring(gline *gl) { | |
125 | static char mask[512]; /* check */ | |
126 | ||
127 | if (gl->flags & GLINE_REALNAME) { | |
128 | snprintf(mask, sizeof(mask), "$R%s", (gl->user) ? gl->user->content : "*"); | |
129 | return mask; | |
130 | } | |
131 | ||
132 | if (gl->flags & GLINE_BADCHAN) { | |
133 | assert(gl->user); | |
134 | ||
135 | strncpy(mask, gl->user->content, sizeof(mask)); | |
136 | return mask; | |
137 | } | |
138 | ||
139 | snprintf(mask, sizeof(mask), "%s!%s@%s", | |
140 | gl->nick ? gl->nick->content : "*", | |
141 | gl->user ? gl->user->content : "*", | |
142 | gl->host ? gl->host->content : "*"); | |
143 | ||
144 | return mask; | |
145 | } | |
146 |