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1 | /* $Id$ | |
2 | * | |
3 | * Pass an mr_params off to the Moira server and get a reply | |
4 | * | |
5 | * Copyright (C) 1987-1998 by the Massachusetts Institute of Technology | |
6 | * For copying and distribution information, please see the file | |
7 | * <mit-copyright.h>. | |
8 | */ | |
9 | ||
10 | #include <mit-copyright.h> | |
11 | #include <moira.h> | |
12 | #include "mr_private.h" | |
13 | ||
14 | #include <errno.h> | |
15 | #include <stdlib.h> | |
16 | #include <string.h> | |
17 | #ifndef _WIN32 | |
18 | #include <netinet/in.h> | |
19 | #endif /* _WIN32 */ | |
20 | ||
21 | #ifdef HAVE_UNISTD_H | |
22 | #include <unistd.h> | |
23 | #endif | |
24 | ||
25 | RCSID("$Header$"); | |
26 | ||
27 | /* Moira RPC format: | |
28 | ||
29 | 4-byte total length (including these 4 bytes) | |
30 | 4-byte version number (MR_VERSION_2 == 2) | |
31 | 4-byte opcode (from client) or status (from server) | |
32 | 4-byte argc | |
33 | ||
34 | 4-byte len, followed by null-terminated string, padded to 4-byte boundary | |
35 | (the len doesn't include the padding) | |
36 | ... | |
37 | ||
38 | (followed by more packets if status was MR_MORE_DATA) | |
39 | ||
40 | All numbers are in network byte order. | |
41 | */ | |
42 | ||
43 | int mr_do_call(struct mr_params *params, struct mr_params *reply) | |
44 | { | |
45 | int status; | |
46 | ||
47 | CHECK_CONNECTED; | |
48 | ||
49 | status = mr_send(_mr_conn, params); | |
50 | if (status == MR_SUCCESS) | |
51 | status = mr_receive(_mr_conn, reply); | |
52 | ||
53 | if (status) | |
54 | mr_disconnect(); | |
55 | ||
56 | return status; | |
57 | } | |
58 | ||
59 | int mr_send(int fd, struct mr_params *params) | |
60 | { | |
61 | u_long length; | |
62 | int written; | |
63 | int i, *argl; | |
64 | char *buf, *p; | |
65 | ||
66 | length = 16; /* length + version + opcode/status + argc */ | |
67 | ||
68 | if (params->mr_argl) | |
69 | { | |
70 | argl = params->mr_argl; | |
71 | for (i = 0; i < params->mr_argc; i++) | |
72 | length += 8 + argl[i]; | |
73 | } | |
74 | else | |
75 | { | |
76 | argl = malloc(params->mr_argc * sizeof(int)); | |
77 | if (params->mr_argc && !argl) | |
78 | return ENOMEM; | |
79 | for (i = 0; i < params->mr_argc; i++) | |
80 | { | |
81 | argl[i] = strlen(params->mr_argv[i]) + 1; | |
82 | length += 8 + argl[i]; | |
83 | } | |
84 | } | |
85 | ||
86 | buf = malloc(length); | |
87 | if (!buf) | |
88 | { | |
89 | if (!params->mr_argl) | |
90 | free(argl); | |
91 | return ENOMEM; | |
92 | } | |
93 | memset(buf, 0, length); | |
94 | ||
95 | putlong(buf + 4, MR_VERSION_2); | |
96 | putlong(buf + 8, params->u.mr_procno); | |
97 | putlong(buf + 12, params->mr_argc); | |
98 | ||
99 | for (i = 0, p = buf + 16; i < params->mr_argc; i++) | |
100 | { | |
101 | putlong(p, argl[i]); | |
102 | memcpy(p += 4, params->mr_argv[i], argl[i]); | |
103 | p += argl[i] + (4 - argl[i] % 4) % 4; | |
104 | } | |
105 | length = p - buf; | |
106 | putlong(buf, length); | |
107 | ||
108 | written = send(fd, buf, length, 0); | |
109 | free(buf); | |
110 | if (!params->mr_argl) | |
111 | free(argl); | |
112 | ||
113 | if (written != (int)length) | |
114 | return MR_ABORTED; | |
115 | else | |
116 | return MR_SUCCESS; | |
117 | } | |
118 | ||
119 | int mr_receive(int fd, struct mr_params *reply) | |
120 | { | |
121 | int status; | |
122 | ||
123 | memset(reply, 0, sizeof(struct mr_params)); | |
124 | do | |
125 | status = mr_cont_receive(fd, reply); | |
126 | while (status == -1); | |
127 | ||
128 | return status; | |
129 | } | |
130 | ||
131 | /* Read some or all of a client response, without losing if it turns | |
132 | * out to be malformed. Returns MR_SUCCESS on success, an error code | |
133 | * on failure, or -1 if the packet hasn't been completely received | |
134 | * yet. | |
135 | */ | |
136 | ||
137 | int mr_cont_receive(int fd, struct mr_params *reply) | |
138 | { | |
139 | u_long length, data; | |
140 | int size, more; | |
141 | char *p, *end; | |
142 | int i; | |
143 | ||
144 | if (!reply->mr_flattened) | |
145 | { | |
146 | char lbuf[4]; | |
147 | ||
148 | size = recv(fd, lbuf, 4, 0); | |
149 | if (size != 4) | |
150 | return size ? MR_ABORTED : MR_NOT_CONNECTED; | |
151 | getlong(lbuf, length); | |
152 | if (length > 8192) | |
153 | return MR_INTERNAL; | |
154 | reply->mr_flattened = malloc(length); | |
155 | if (!reply->mr_flattened) | |
156 | return ENOMEM; | |
157 | memcpy(reply->mr_flattened, lbuf, 4); | |
158 | reply->mr_filled = 4; | |
159 | ||
160 | return -1; | |
161 | } | |
162 | else | |
163 | getlong(reply->mr_flattened, length); | |
164 | ||
165 | more = recv(fd, reply->mr_flattened + reply->mr_filled, | |
166 | length - reply->mr_filled, 0); | |
167 | if (more == -1) | |
168 | { | |
169 | mr_destroy_reply(*reply); | |
170 | return MR_ABORTED; | |
171 | } | |
172 | ||
173 | reply->mr_filled += more; | |
174 | ||
175 | if (reply->mr_filled != length) | |
176 | return -1; | |
177 | ||
178 | getlong(reply->mr_flattened + 4, data); | |
179 | if (data != MR_VERSION_2) | |
180 | { | |
181 | mr_destroy_reply(*reply); | |
182 | return MR_VERSION_MISMATCH; | |
183 | } | |
184 | ||
185 | getlong(reply->mr_flattened + 8, reply->u.mr_status); | |
186 | getlong(reply->mr_flattened + 12, reply->mr_argc); | |
187 | if (reply->mr_argc > ((int)length - 16) / 8) | |
188 | { | |
189 | mr_destroy_reply(*reply); | |
190 | return MR_INTERNAL; | |
191 | } | |
192 | reply->mr_argv = malloc(reply->mr_argc * sizeof(char *)); | |
193 | reply->mr_argl = malloc(reply->mr_argc * sizeof(int)); | |
194 | if (reply->mr_argc && (!reply->mr_argv || !reply->mr_argl)) | |
195 | { | |
196 | mr_destroy_reply(*reply); | |
197 | return ENOMEM; | |
198 | } | |
199 | ||
200 | p = (char *)reply->mr_flattened + 16; | |
201 | end = (char *)reply->mr_flattened + length; | |
202 | for (i = 0; i < reply->mr_argc && p + 4 <= end; i++) | |
203 | { | |
204 | getlong(p, reply->mr_argl[i]); | |
205 | if (p + 4 + reply->mr_argl[i] > end) | |
206 | break; | |
207 | reply->mr_argv[i] = p + 4; | |
208 | p += 4 + reply->mr_argl[i] + (4 - reply->mr_argl[i] % 4) % 4; | |
209 | } | |
210 | ||
211 | if (i != reply->mr_argc) | |
212 | { | |
213 | mr_destroy_reply(*reply); | |
214 | return MR_INTERNAL; | |
215 | } | |
216 | ||
217 | return MR_SUCCESS; | |
218 | } | |
219 | ||
220 | void mr_destroy_reply(mr_params reply) | |
221 | { | |
222 | free(reply.mr_argl); | |
223 | free(reply.mr_argv); | |
224 | free(reply.mr_flattened); | |
225 | } |